CleaverBrooks FLX Operation, Service And Parts Manual

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MODEL FLX

PACKAGED BOILER

1,500,000 to 12,000,000 Btu/hr

Hot Water and Steam

Fuel: Light Oil, Gas or Combination

Manual Part No. 750-177 R5

10/2009

MODEL FLX

PACKAGED BOILER

Operation, Service, and Parts Manual

1,500,000 to 12,000,000 Btu/hr

Fuel: Light Oil, Gas or Combination

Please direct purchase orders for replacement manuals to your local Cleaver-Brooks authorized representative

Manual Part No. 750-177 R5

Revised 10/2009

Printed in U.S.A.

WARNING

DANGER

DO NOT OPERATE, SERVICE, OR REPAIR THIS EQUIPMENT UNLESS YOU FULLY UNDERSTAND ALL APPLICABLE SECTIONS OF THIS MANUAL.

DO NOT ALLOW OTHERS TO OPERATE, SERVICE, OR REPAIR THIS EQUIPMENT UNLESS THEY FULLY UNDERSTAND ALL APPLICABLE SECTIONS OF THIS MANUAL.

FAILURE TO FOLLOW ALL APPLICABLE WARNINGS AND INSTRUCTIONS MAY RESULT IN SEVERE PERSONAL INJURY OR DEATH.

TO: Owners, Operators and/or Maintenance Personnel

This operating manual presents information that will help to properly operate and care for the equipment. Study its contents carefully. The unit will provide good service and continued operation if proper operating and maintenance instructions are followed. No attempt should be made to operate the unit until the principles of operation and all of the components are thoroughly understood. Failure to follow all applicable instructions and warnings may result in severe personal injury or death.

It is the responsibility of the owner to train and advise not only his or her personnel, but the contractors' personnel who are servicing, repairing or operating the equipment, in all safety aspects.

Cleaver-Brooks equipment is designed and engineered to give long life and excellent service on the job. The electrical and mechanical devices supplied as part of the unit were chosen because of their known ability to perform; however, proper operating techniques and maintenance procedures must be followed at all times. Although these components afford a high degree of protection and safety, operation of equipment is not to be considered free from all dangers and hazards inherent in handling and firing of fuel.

Any "automatic" features included in the design do not relieve the attendant of any responsibility. Such features merely free him of certain repetitive chores and give him more time to devote to the proper upkeep of equipment.

It is solely the operator’s responsibility to properly operate and maintain the equipment. No amount of written instructions can replace intelligent thinking and reasoning and this manual is not intended to relieve the operating personnel of the responsibility for proper operation. On the other hand, a thorough understanding of this manual is required before attempting to operate, maintain, service, or repair this equipment.

Because of state, local, or other applicable codes, there are a variety of electric controls and safety devices which vary considerably from one boiler to another. This manual contains information designed to show how a basic burner operates.

Operating controls will normally function for long periods of time and we have found that some operators become lax in their daily or monthly testing, assuming that normal operation will continue indefinitely. Malfunctions of controls lead to uneconomical operation and damage and, in most cases, these conditions can be traced directly to carelessness and deficiencies in testing and maintenance.

It is recommended that a boiler room log or record be maintained. Recording of daily, weekly, monthly and yearly maintenance activities and recording of any unusual operation will serve as a valuable guide to any necessary investigation.

Most instances of major boiler damage are the result of operation with low water. We cannot emphasize too strongly the need for the operator to periodically check his low water controls and to follow good maintenance and testing practices. Cross-connecting piping to low water devices must be internally inspected periodically to guard against any stoppages which could obstruct the free flow of water to the low water devices. Float bowls of these controls must be inspected frequently to check for the presence of foreign substances that would impede float ball movement.

The waterside condition of the pressure vessel is of extreme importance. Waterside surfaces should be inspected frequently to check for the presence of any mud, sludge, scale or corrosion.

The services of a qualified water treating company or a water consultant to recommend the proper boiler water treating practices are essential.

The operation of this equipment by the owner and his or her operating personnel must comply with all requirements or regulations of his insurance company and/or other authority having jurisdiction. In the event of any conflict or inconsistency between such requirements and the warnings or instructions contained herein, please contact Cleaver-Brooks before proceeding.

TABLE OF CONTENTS

Chapter 1

Basics of Flexible Watertube Operation

A. General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

B. The Boiler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

C. Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

D. Steam Controls (All Fuels) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

E. Hot Water Controls (All Fuels) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Chapter 2

ProFire™ V Burner

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Startup and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

Burner Specs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39

Chapter 3

Pressure Vessel Care

A. General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

B. Hot Water Boilers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

C. Water Requirements (Steam Boilers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

D. Water Treatment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

E. Blowdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

F. Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

G. Boilout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

H. Washing Out. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

I. Periodic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

J. Preparation For Extended Lay-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Chapter 4

Sequence Of Operation

A. General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

B. Circuit And Interlock Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

C. Sequence Of Operation - Oil Or Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

D. Flame Loss Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

TABLE OF CONTENTS(continued)

Chapter 5

Adjustment Procedures

A. General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

B. Linkage - Modulating Motor & Air Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

C. Modulating Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

D. Modulating Motor Switches Low Fire and High Fire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

E. Burner Operating Controls - General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

F. Modulating Pressure Control (Steam). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

G. Operating Limit Pressure Control (Steam). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

H. High Limit Pressure Control (Steam) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

I. Modulating Temperature Control (Hot Water) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

J. Operating Limit Temperature Control (Hot Water). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

K. High Limit Temperature Control (Hot Water) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

L. Low Water Cutoff Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

M. Combustion Air Proving Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

N.Gas Pilot Flame Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

O. Gas Pressure and Flow Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

P. Gas Fuel Combustion Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

Q. Low Gas Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

R. High Gas Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

S. Fuel Oil Pressure and Temperature - General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

T. Fuel Oil Combustion Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

U. Low Oil Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

Chapter 6

Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

iii

TABLE OF CONTENTS(continued)

Chapter 7

Inspection And Maintenance

A. General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

B. Periodic Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

C. Fireside Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

D. Upper Pass Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

E. Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

F. Oil Burner Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

G. Gas Burner Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

H. Refractory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

I. Casing Seals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

Chapter 8

Casing HW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

Casing Low Pressure Steam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4

Casing High Pressure Steam. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6

Steam Pressure Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8

Water Level Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9

Water Column, Main and Aux. - 15# Steam. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11

Water Column, Main and Aux. - 150# Steam. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12

CHAPTER 1

GENERAL DESCRIPTION

A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

B. The Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

C. Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

D. Steam Controls (All Fuels) . . . . . . . . . . . . . . . . . . . 1-2

E. Hot Water Controls (All Fuels) . . . . . . . . . . . . . . . . 1-4

A. General

The information in this manual applies directly to CleaverBrooks FLX Model boilers in sizes ranging from 1,500,000 to 12,000,000 Btu/hr input.

Fuel Series

700- Gas

100-No.2 0il

CAUTION

DANGER

The care taken in placing the boiler into initial service is vital to continuous, reliable operation. If the boiler is to be used for temporary heat (for example in new construction), properly treated water must be used. Failure to do so can be detrimental to the boiler.

200 - Combination Gas & No.2 Oil

Design Pressure

160 psig hot water

15 psig steam

150 psig steam

750-177 1-1

Figure 1-1: FLX Cut Away

Chapter 1 GENERAL DESCRIPTION

B. The Boiler

The Cleaver-Brooks Model FLX is a five-pass steel boiler with flexible watertubes formed and arranged so as to direct the flow of combustion gases through the boiler. The pressure vessel conforms to Section I or IV of the ASME code. The pressure vessel consists of the formed tubes, the external downcomer, and the top and bottom drums to which they connect. The heated area of the pressure vessel is contained within a gas tight insulated casing that is composed of removable formed steel panels.

Always order genuine Cleaver-Brooks parts from your local Cleaver-Brooks authorized representative.

The boiler and related equipment installation are to be in compliance with the standards of the National Board of Fire Underwriters. Installation should also conform to state and local codes governing such equipment. Prior to installation, the proper authorities having jurisdiction are to be consulted, permits obtained, etc. All boilers in the above series comply, when equipped with optional equipment, to Industrial Risk Insurers (IRI), Factory Mutual (FM), or other insuring underwriters requirements.

The Model FLX boiler is a packaged watertube boiler of welded steel construction and consists of a pressure vessel, burner, burner controls, forced draft fan, damper, refractory, and appropriate boiler trim.

The type of service that your boiler is required to provide has an important bearing on the amount of waterside care it will require.

CAUTION

DANGER

Waterside care is of prime importance. For specific information or assistance with your water treatment requirements, contact your Cleaver-Brooks service and parts representative. Failure to follow these instructions could result in equipment damage.

Feedwater equipment should be checked and ready for use. Be sure that all valves, piping, boiler feed pumps, and receivers are installed in accordance with prevailing codes and practices.

Water requirements for both steam and hot water boilers are essential to boiler life and length of service. Constant attention to water requirements will pay dividends in the form of longer life, less down-time, and prevention of costly repairs. Care taken in placing the pressure vessel into initial service is vital. The waterside of new boilers and new or remodeled steam or hot water systems may contain oil, grease or other foreign matter. A method of boiling out the vessel to remove accumulations is described in Chapter 3.

The operator should be familiar with Chapter 3 before attempting to place the unit into operation.

Hot water is commonly used in heating applications with the boiler supplying water to the system at 180 °F to 220 °F. The operating pressure for hot water heating systems usually is 30 psig to 125 psig.

Steam boilers are designed for low and high pressure applications. Low pressure boilers are limited to 15 psig design pressure, and are typically used for heating applications. High pressure boilers are limited to 150 psig design pressure, and are typically used for process steam applications.

Steam and hot water boilers are defined according to design pressure and operating pressure. Design pressure is the maximum pressure used in the design of the boiler for the purpose of calculating the minimum permissible thickness or physical characteristics of the pressure vessel parts of the boiler. Typically, the safety valves are set at or below design pressure. Operating pressure is the pressure of the boiler at which it normally operates. The operating pressure usually is maintained at a suitable level below the setting of the pressure relieving valve(s) to prevent their frequent opening during normal operation.

C. Construction

Steam boilers designed for 15 psig and hot water boilers designed for 250°F at 160 psi or less are constructed in accordance with Section IV, Heating Boilers, of ASME Code. Steam boilers designed for 150 psig are constructed in accordance with Section I, Power Boilers, of the ASME Code.

D. Steam Controls (All Fuels)

1. Operating Limit Pressure Control (Figures 1-2 and 1-3): Breaks a circuit to stop burner operation on a rise of boiler pressure at a selected setting. It is adjusted to stop or start the burner at a preselected pressure setting.

2. High Limit Pressure Control (Figure 1-2 and 1-3): Breaks a circuit to stop burner operation on a rise of pressure above a selected setting. It is adjusted to stop the burner at a preselected pressure above the operating limit control setting. The high limit pressure control is equipped with a manual reset.

1-2 750-177

GENERAL DESCRIPTION Chapter 1

3. Modulating Limit Pressure Control (Figure 1-2 and 1-3): Senses changing boiler pressures and transmits the information to the modulating motor to change the burner firing rate when the manual-automatic switch is set on “automatic.”

4. Low Water Cutoff and Pump Control (Figure 1-2, 1-4 and 1-5): Float-operated control responds to the water level in the boiler. It performs two distinct functions:

•Stops firing of the burner if water level lowers below the safe operating point. Energizes the low-water light in the control panel; also causes low-water alarm bell (optional equipment) to ring. Code requirements of some models require a manual reset type of low-water cutoff.

•Starts and stops the feedwater pump (if used) to maintain water at the proper operating level.

CAUTION

DANGER

Determine that the main and auxiliary low water cutoffs and pump control are level after installation and throughout the equipment’s operating life. Failure to f ollow these instructions could result in equipment damage.

5. Water Column Assembly (Figure 1-2): Houses the lowwater cutoff and pump control and includes the water gauge glass, gauge glass shutoff cocks.

6. Water Column Drain Valve (Figure 1-2): Provided so that the water column and its piping can be flushed regularly to assist in maintaining cross-connecting piping and in keeping the float bowl clean and free of sediment. A similar drain valve is furnished with auxiliary low-water cutoff for the same purpose.

7. Gauge Glass Drain Valve (Figure 1-2): Provided to flush the gauge glass.

8. Safety Valve(s) (Figure 1-6 and 1-8): Prevent buildup over the design pressure of the pressure vessel. The size, rating and number of valves on a boiler is determined by the ASME Boiler Code. The safety valves and the discharge piping are to be installed to conform to the ASME code requirements. The installation of a valve is of primary importance to its service life. A valve must be mounted in a vertical position so that discharge piping and code-required drains can be properly piped to prevent buildup of back pressure and accumulation of foreign material around the valve seat area. Apply only a moderate amount of pipe compound to male threads and

WATER COLUM N

LOW WATER CUTOFF AND PUMP CONTROL

CONTROL PANEL

FLAME

DETECTOR

FORCED DRAFT

FAN MOTOR

GAUGE GLASS

DRAIN VALVE

WATER COLUMN

DRAIN VALVE

MODULATING

MOTOR

HIGH LIMIT PRESSURE

OIL SUPPLY

PRESSURE

GAUGE

OPERATING LIMIT PRESSURE CONTROL

MODULATING LIMIT PRESSURE CONTROLCONTROL

STEAM PRESSURE

GAUGE

750-177 1-3

OIL SOLENOID

VALV ES

OIL PUMP

Figure 1-2: Typical Steam Boiler - Light Oil Fired

Chapter 1 GENERAL DESCRIPTION

avoid overtightening, which can distort the seats. Use only flat-jawed wrenches on the flats provided. When installing a flange-connected valve, use a new gasket and

1. HIGH LIMIT PRESSURE CONTROL

2. OPERATING LIMIT PRESSURE CONTROL

3. MODULATING PRESSURE CONTROL

Figure 1-3: Steam Controls

draw the mounting bolts down evenly. Do not install or remove side outlet valves by using a pipe or wrench in the outlet.

WARNING

DANGER

Only properly certified personnel such as the safety valve manufacturer’s certified representative can adjust or repair the boiler safety valves. Failure to follow these instructions could result in serious personal injury or death

E. Hot Water Controls (All Fuels)

Figure 1-4: Low Water Cut Off (LWCO)

1. Water Temperature Gauge (Figure 1-7): Indicates the boiler internal water pressure.

2. Water Pressure Gauge (Figure 1-7): Indicates the internal pressure of the boiler.

3. Operating Limit Temperature Control (Figure 1-7): Breaks a circuit to stop burner operation on a rise of boiler temperature at a selected setting. It is adjusted to

Figure 1-5: Low Water Cut Off Pump Control

(Cutaway)

1-4 750-177

Figure 1-6: Safety Valve Cutaway

GENERAL DESCRIPTION Chapter 1

stop or start the burner at a preselected operating temperature.

4. High Limit Temperature Control (Figure 1-7): Breaks a circuit to stop burner operation on a rise of temperature at a selected setting. It is adjusted to stop burner at a preselected temperature above the operating control setting. The high limit temperature control is equipped with a manual reset.

5. Modulating Temperature Control (Figure 1-7): Senses changing boiler water temperature and transmits the information to the modulating motor to change the burner firing rate when the manual-automatic switch is set on “automatic.”

6. Low Water Cutoff (Figure 1-7): Breaks the circuit to stop burner operation if the water level in the boiler drops below safe operating point, activating low-water light and optional alarm bell if burner is so equipped.

7. Auxiliary Low Water Cutoff (Not Shown) (Optional): Breaks the circuit to stop burner operation if the water

level in the boiler drops below the master low-water cutoff point.

WATER PRESSURE

GAUGE

WATER TEMPERATURE GAUGE

LOW WATER CUTOFF PROBE

1. High Limit Temperature Control

2. Operating Limit Temperature Control

3. Modulating Temperature Control

4. Low Water Cutoff Control

750-177 1-5

Figure 1-7: Hot Water Controls

Chapter 1 GENERAL DESCRIPTION

SUPPORT FROM BUILDING

DISCHARGE OPENING MUST BE EQUAL TO OR LARGER THAN INLET

DRIP ELL DRAIN

SAFETY VALVE

NOTICE: BACK-PRESSURE OF STEAM EXHAUST SYSTEM MUST BE LESS THAN 6% OF SAFETY VALVE SETTING.

WATER LEVEL

CONSTRUCTION

CAUTION VENT PIPE MUST NOT TOUCH DRIP PAN EXTENSION

TO STEAM

VENT

VENT PIPE

DRIP PAN

EXTENSION

AND ELBOW

OPEN DRAIN

TO WASTE

BOILER SHELL

Figure 1-8: Recommended Piping For Steam

Relief Valve (Not furnished by Cleaver-Brooks)

DRIP PAN

1 1/2”

MIN.

DRIP PAN

DRAIN

remove side outlet valves by using a pipe or wrench in the outlet.

WARNING

DANGER

Only properly certified personnel such as the relief valve manufacturer’s certified representative can adjust or repair the boiler relief valves. Failure to follow these instructions could result in serious personal injury or death.

1-6 750-177

CHAPTER 2

Profire V Burner

A. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

B. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

C. Startup and Operation . . . . . . . . . . . . . . . . . . . . . . .2-17

D. Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-22

E. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-31

F. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . .2-35

G. Burner Specs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-39

A. Introduction

CB Profire V/Series burners are assembled, wired, and tested at the factory. The V/Series burner line is listed by the Underwriters Laboratory for the U.S. and Canada, and bears the UL and cUL markings when ordered as such by the customer. Compliance with other regulatory agencies such as CSD-1, I.R.I./GE GAP, F.M., etc., is available at time of order.

Optional controls and control systems are also available. The operator of this equipment must be familiar with the individual functioning of all controls to understand the operations and procedures described in this manual, and supplementary instructions provided with optional controls. Identify and locate each item in the illustrations as they are described in the following sections.

The burners are available in the following configurations:

SIZE 1 - V13-34 - On-Off (Optional: Low-High-Off, LowHigh-Low, Full Modulation)

SIZE 2 - V35-55 - Low-High-Off (Optional: Low-High-Low, Full Modulation)

SIZE3 - V60-63 - Low-High-Off (Optional: Low-High-Low, Full Modulation)

SIZE 3 & 4 - V70-168 - Full Modulation

OPERATING CONTROLS - PANEL

The burner control panel may be integral to the burner or remote, and contains a flame safeguard programming control, motor relays (starters), and terminal strips mounted internally on a panel subbase. Lights, switches, and a control circuit breaker are mounted externally on the panel.

1. ON-OFF BURNER SWITCH

2. FUEL SELECTOR SWITCH - Gas-Off-Oil

Gas position: Selects gas as the firing fuel Off position: Burner off Oil position: Selects oil as the firing fuel

3. CONTROL CIRCUIT BREAKER

Supplementary low overcurrent protection only. No larger than 15 amps.

CAUTION

DANGER

ONLY FACTORY AUTHORIZED BURNER SERVICE PERSONNEL SHOULD START UP, ADJUST, OR SERVICE THIS EQUIPMENT.

DESCRIPTION

The CB Profire V/Series burners are designed to operate with natural gas and light oil. The burners are designed for automatic, unattended operation except for periodic inspection and maintenance. The control panel components require little attention except for occasional cleaning.

750-177 2-1

4. AUTO-MANUAL MODULATION SELECTOR SWITCH

Auto position: Selects boiler modulation control. In this position, the burner will operate automatically in response to load demand. Manual position: Selects 135 ohm potentiometer for manual modulating control.

5. MANUAL MODULATING CONTROL - 135 ohm

(For full modulation burner only.) Increases or decreases the burner firing rate.

6. SIGNAL LAMPS

a. POWER ON (white) - Illuminates when the control circuit is energized (powered). b. IGNITION (amber) - Illuminates when the ignition

2-1

Chapter 2 Profire V Burner

transformer is powered, and pilot valve is energized (open). c. MAIN FUEL (green) - Illuminates when the main fuel valve or valves are energized (open). d. FLAME FAILURE (red) - Illuminates when the flame safeguard system fails to detect pilot or main flame.

7. MODULATING MOTOR

Operates the air damper and fuel rate valves through a linkage system to adjust air-fuel ratios under all load conditions.

8. IGNITION TRANSFORMER

Provides high voltage spark for ignition of gas pilot or main flame direct spark models.

FLAME SAFEGUARD CONTROLS

The flame safeguard controls the operating sequence of the combustion system (pre-purge, pilot, firing, and shutdown). The flame safeguard programmer incorporates a flame sensing cell (scanner) to shut down the burner in the event of pilot flame or main flame failure. Other safety controls shut down the burner based on sequence of operation as shown in the manufacturer’s flame safeguard manual.

When a parallel positioning system is furnished, the flame safeguard may be incorporated as an integral component to the parallel positioning control. Consult burner and component technical documentation.

air flow with the fuel flow provides efficient combustion at all firing rates.

OIL SYSTEM

Models Vl-VLG are high pressure atomizing burners using fuel pressure for atomization. Atomized fuel is discharged from the nozzle as a fine conical spray.

1. FUEL UNIT - Size 1 & 2

Direct driven from the blower motor with a flexible coupling at 3450 rpm, and set for 300 psi operation, fuel unit is two stage (two sets of gears) and must be installed for a two pipe installation, one suction and one return line. Separately driven oil pumps are available as options to the standard arrangement.

Size 3 & 4

A separately driven oil pump is standard.

2. NOZZLE

The nozzle meters oil flow delivering a specified amount at a specific pressure. Fuel pressure (mechanical) atomizes oil in a fine conical spray pattern from the nozzle orifice. The

ABC

burner is supplied with nozzle(s) to fire to its maximum rate unless a different firing rate was specified. VL and VLG models 13-34 supplied with simplex nozzles, models 35-168 are supplied with return flow nozzles.

3. NOZZLE ADAPTOR

EFG

COMBUSTION AIR HANDLING SYSTEM

1. MOTOR AND BLOWER

The impeller is directly driven by the motor at 3450 rpm. A heavy duty forward curved, multi-blade centrifugal impeller supplies combustion air.

2. AIR VOLUME REGULATOR

Air dampers are located in the air inlet housing. The dampers are mechanically linked and actuated by a two-position motor or hydraulic cylinder for on-off operation. Low-high-off, low-high-low, or full modulation burners have the dampers mechanically linked to the modulating motor.

3. COMBUSTION AIR PROVING SWITCH

A pressure sensitive, differential switch actuated by air pressure created by the blower fan. Contacts close to prove combustion air flow.

4. DIFFUSER

An air flow diffuser stabilizes flame front.

OPERATION: Air from the impeller flows through the blast

tube and diffuser to mix with fuel in the ignition zone. Combustion air flow rate is determined by the position of the air regulating blades at the inlet of the impeller. Linking the

The nozzle adaptor provides the means for connecting fuel lines with the nozzle.

4. OIL SOLENOID VALVES

Two normally closed (N.C.) and one normally open (N.O.) solenoid valves are part of the oil system on LO-HI-OFF and

LO-HI-LO burners. The two N.C. valves provide positive shutoff of fuel oil while the one N.O. valve cycles the burner to HI fire when closed.

5. OIL METERING VALVE

The firing rate is controlled by an adjustable metering valve in the return line. At low fire, the metering valve is open, and is closed at high fire.

6. OIL FILTER

Prevents foreign matter from entering the burner oil system. This item is provided optional and shipped loose with burner.

OPERATION: Fuel oil is delivered to the fuel unit, either by

gravity, fuel unit suction, or by a circulating pump, through a fuel oil filter. Pressurized fuel returns to the storage tank until the two solenoid valves open. On direct spark ignited burners (VL-13 to 55) ignition occurs when the oil valves open. Where gas pilots are provided (models VG and VLG), the oil valves open after the pilot is proven. Oil input rate is controlled by the oil metering valve, which varies the flow to

2-2 750-177

Profire V Burner Chapter 2

meet load demands. The low fire positions bypass oil back to the storage tank. At high fire, the metering valve is in the closed position. The modulating motor positions the metering valve and the air damper simultaneously.

IGNITION SYSTEM

Oil only models VL-13 to 55 are supplied with direct spark ignition. Models VL-60 to 168 are supplied with a gas pilot system. Gas and combination gas-oil models are supplied with a gas ignition system. The standard pilot gas train consists of a manual shutoff cock, a gas pressure regulator, and a solenoid operated gas shutoff valve.

GAS HANDLING SYSTEM

Depending upon the requirements of the regulating authority, the gas control system and gas train may consist of some, or all, of the following items:

1. GAS VOLUME VALVE

The butterfly type valve is positioned by linkage from the modulating motor and control the rate of flow of gas.

2. MAIN GAS VALVES

Electrically operated safety shutoff valve(s) that open to admit gas to the burner. Standard U.L. burners include:

A pressure actuated switch that remains closed when gas pressure is above a selected setting. Should the pressure drop below this setting, the switch contacts will open, causing main gas valve(s) to close. This switch requires manual reset after being tripped.

OPERATION: Metered gas flows through the main gas

shutoff cock, through the pressure regulators to the automatic gas valves and butterfly valve to the gas manifold. The butterfly gas valve modulates flow to burner input demand. The butterfly valve is positioned through mechanical linkage by the modulating motor. The air control damper is positioned simultaneously by the modulating motor. The automatic gas valve(s) cannot be energized unless the combustion air proving switch is closed. The low and high gas pressure switches must be closed to prove proper gas pressure.

A normally open vent valve, if required, is located between the two automatic gas valves. This valve is shut when the automatic gas valves are open. When the automatic valves are closed, the vent valve is open for venting gas to the outside, should any be present.

Notice: Gas train components upstream of the

butterfly valve are shipped loose to be mounted by the installer.

• Models 13-25: Diaphragm gas valve & solenoid valve.

• Models 30-50: One motorized gas valve w/proof of closure or two safety shutoff valves.

• Models 55-120: One motorized gas valve w/proof of closure and one safety shutoff valve.

• Models 126-168: Two motorized gas valves.

(Two motorized gas valves can be optionally provided on all models.)

3. MAIN GAS REGULATOR

Regulates gas train pressure to specified pressure required at the burner manifold. Input is set by main gas pressure regulator adjustment.

4. MAIN GAS COCKS

Used for manual shutoff of the gas supply upstream of the pressure regulator. A second shutoff cock downstream of the main gas valve(s) provides a means of testing for leakage through the gas valve(s).

5. HIGH GAS PRESSURE SWITCH (Models 30-168)

A pressure actuated switch that remains closed when gas pressure is below a selected setting. Should the pressure rise above the setting, the switch contacts will open causing main gas valve(s) to close. This switch requires manual reset after being tripped.

Notice: Pilot gas supply connection must be

upstream of the main gas pressure regulator.

6. LOW GAS PRESSURE SWITCH (Models 30-168)

750-177 2-3

Chapter 2 Profire V Burner

Figure 2-1: Profire Burner

Figure 2-2: Interior Burner Components

Figure 2-2: Burner-Cutaway View

2-4 750-177

Profire V Burner Chapter 2

BURNER

MODEL A B C D E F

SIZE 1

SIZE 2

SIZE 3

SIZE 4

32 7/8 12 3/8

37 1/3 13 5/8

44 3/8 16 1/8

54 3/8 24 7/8

8 1/4 3 3/4

4104

11 1/2 3 3/4 17 1/2 15 3/4 41 3/4 15 1/4 7 3/8 16 3/4 15 1/4 8 3/8 17 3/8 12 1/2 14 1/8 6 1/4 10 1/4 18 5/8

13 5/8

B. Installation

K DIA.

STANDARD CONFIGURATION - REAR MOUNTED PANEL, GAS PILOT LINE PANEL MOUNTED

18 1/8

25 1/4

H I

9 3/4

34 1/2 10 1/2 7 3/8

45 7/8 13 1/2 7 3/8 17 1/2 15 3/8 8 3/4 20 1/8 14 1/2

K L M N P R S T

9 3/4 7 3/8 12 7/8 11 1/4 6 1/2 14 3/8

13 1/4 7 1/2 15 1/8 12 1/2 12 3/4 6 1/4

Figure 2-3: Burner Dimensions (Inches)

Consult with insurance carrier and/or local authorities for specific regulations.

4X Ø3/4 L B.C.

656-00037

5 /14 7 1/4 11 3/4

7 1/2 12 1/4 19 1/4

14 1/2

DRAFT CONDITIONS

A boiler or other heating vessel fired with a V Series burner does not depend on chimney draft for proper combustion air. Combustion air is supplied by the burner forced draft blower providing adequate air for any normal combustion condition.

Since draft control is essential to maximum efficiency, a draft regulator may be required when the vessel is connected to a tall stack or where wind conditions may cause erratic draft. Excessive furnace draft contributes to inefficient burner operation.

Sealed boilers may be operated under positive firebox pressure within the capability of the burner.

COMBUSTION AIR SUPPLY

The space in which a burner operates must be supplied with adequate fresh air for combustion and ventilation purposes. Fresh air supply must meet or exceed all code requirements.

WARNING

DANGER

CAUTION

DANGER

THE BOILER ROOM PRESSURE MUST BE AT LEAST EQUAL TO THE OUTDOOR A TMOSHERIC PRESSURE. WHERE FAN VENTILATION IS USED, AIR MUST BE FORCED INTO THE BOILER ROOM. NEVER EXHAUST AIR FROM THE BOILER ROOM. ADJOINING AREAS HAVING EXHAUST FANS MUST BE POSITIVELY ISOLATED FROM THE BOILER ROOM.

COMBUSTION CHAMBER DESIGN

The V series burners are of the forced draft flame retention type. Refractory is required only to protect surfaces not adequately protected by free circulating water. Four basic objectives are:

• Provide adequate combustion space

• Avoid flame impingement

• Protect surfaces not adequately water cooled

• Seal openings

The table below shows suggested minimum combustion chamber dimensions.

750-177 2-5

Chapter 2 Profire V Burner

Suggested Minimum Combustion Chamber Dimensions

While these dimensions are typical for good practice, satisfactory results may be achieved with modifications to suit some conditions. Factors such as fuel properties, total combustion volume, length of flame trave often make fixed requirements impractical. When in doubt, consult the factory.

Insulation should be provided between the refractory and the boiler base. Mineral wool, or other material not likely to settle is preferred. The chamber front wall may be constructed of firebrick or insulating firebrick. Insulation should be used between refractory and front plate. Firebrick, or insulating firebrick should be set in high temperature bonding mortar with provision for expansion.

CAUTION

DANGER

THE GASKET MUST BE RESILIENT TO SEAL ANY UNEVEN AREAS BETWEEN THE BURNER FLANGE AND THE BOILER FRONT PLATE TO PREVENT LEAKAGE OF COMBUSTION GASSES.

Suggested Minimum Combustion Chamber Dimensions are based on the rated capacity of the burner.

Figure 2-7: V Burner Installation, Commercial Watertube Boiler

2-6 750-177

Profire V Burner Chapter 2

GAS PIPING

Gas service and house piping must supply the quantity of gas demanded by the unit at the pressure required at the burner gas train inlet.

All piping must be in strict accordance with applicable codes, ordinances and regulations of the supplying utility. In the absence of other codes, piping should be in accordance with the following standards: “National fuel Gas Code” NFPA No. 54, ANSI No. Z223-1.

Gas train components upstream of the butterfly valve are shipped loose. These components should be mounted by the installer as close to the butterfly valve as practical.

Normally, the control train is ordered to suit a particular code or insurance regulation - such as Underwriters Laboratories/ Canadian Underwriters Laboratories (UL/cUL), Factory Mutual, or Industrial Risk Insurance.

Arrange gas piping at the burner so that the burner is accessible for servicing without disassembly.

The pilot gas train is supplied with the burner, and is factory installed. The gas pilot supply line must be connected upstream of the main gas regulator. If a reducing bushing is required between the house piping and the burner piping, it should be close to the burner shutoff valve.

The gas piping must be internally clean and free of foreign material. Before using in service, a leak test must be performed.

FUEL OIL PIPING

PRESSURE ATOMIZATION OIL PIPING

The VL and VLG model burners use pressure atomization. Fuel oil is provided by a burner mounted fuel unit directly coupled to the blower motor via a flexible coupling on Size 1 & 2 burners, Remote Pump on Size 3 & 4 burners. The suction and return line sizes (two-pipe system) are based on the suction rate of the fuel unit and not the burner firing rate. Pipe size must be selected sot that suction vacuum is within suitable limits.

TWO PIPE - SINGLE BURNER OPERATION

A two-pipe system is essential. The suction and return between the storage tank or supply source and the burner must be sized to supply the required quantity of oil circulated, including excess oil returned to the storage tank.

SUCTION LINE SIZING

The Suction load is determined by:

1. The vertical lift from the oil level in the tank to the pump.

2. Pressure drop through valves, fittings, strainers, etc.

a. Quantity of oil pumped (gph). b. Length of suction line (feet). c. Diameter of the suction line. d. Number of fittings.

Although the gear type pumps used on the V series burners are capable of developing higher suction, it is not desirable to operate above 15 inches of mercury vacuum. If the vacuum is greater, flow may be erratic.

Refer to the manufacturer’s table for line sizing.

1. Check suction capacity.

2. Measure total pipe length (horizontal and vertical).

3. Read up from line “total feet of copper tube” to the intersection line of the specific “suction capacity” in gph.

4. Read left to column “inches of vacuum at fuel unit.” This is vacuum required to draw oil through pipe listed at given length.

5. Add 1” of vacuum for every foot of lift.

6. Total inches of vacuum (frictional tube loss plus lift).

7. If total exceeds 15”, check next larger pipe size.

RETURN LINE SIZING

Generally, the return line should be sized the same as the suction line.

TWO PIPE - MULTIPLE BURNER SYSTEM

Several options exist for a multiple burner installation.

The circulating pump is sized for the total suction capacity of all burners. Note that a special pressure regulating valve is required if the fuel unit inlet pressure is above 3 psi.

Depending on configurations:

• separate suction lines for each burner with a common

return line

• multiple burners with oil supplied by a transfer pump

• a pump supplies oil to the day tank

• flooded loop system - the circulating pump is sized

according to the maximum burner firing rate for all burners plus a 30% service factor

Notice: CB Profire recommends that all oil firing burners be equipped with an oil strainer (if not included with the burner) to prevent particles from clogging the nozzle. It is essential to follow the strainer manufacturer’s maintenance schedule to ensure proper filtration.

3. The friction loss due to oil flow. This loss varies with:

750-177 2-7

Chapter 2 Profire V Burner

Figure 2-11: Typical UL Gas Train, Full Modulation System, Size 1 V13 to V34

Figure 2-12: Typical UL Gas Train, Low-High-Off/Low-High-Low, Size 2 V35 to V63, Full Mod System, Size 2-3-4 V35 to V168

2-8 750-177

Profire V Burner Chapter 2

750-177 2-9

Figure 2-13: Oil System Configurations

Chapter 2 Profire V Burner

Figure 2-14: Multiple Burners Configurations

Figure 2-15: Day Tank

2-10 750-177

Profire V Burner Chapter 2

Figure 2-7: Typical Flooded Loop System

INSTALLATION CHECKLIST

1. All burners are carefully assembled and tested at the factory, but before being placed in service all connectors should again be checked for looseness caused during shipment.

Check:

a. Electrical terminals in the control panel and on all

electrical components. b. Pipe fittings and unions. c. Tubing connections. d. Nuts, bolts, screws.

2. Open all necessary oil shutoff valves. Do not run pumps or fuel unit without oil.

3. Before connecting electrical current to any component, be sure the voltage is the same as that specified on component nameplates.

4. Before burner operation, be sure all motors are rotating in the proper direction.

5. Before firing, make sure the burner firing head and dry areas of the boiler are protected with refractory. The burner mounting flange must be properly sealed against the vessel front plate.

CAUTION

DANGER

BEFORE OPENING THE MANUAL GAS SHUTOFF VALVES, READ THE REGULATOR INSTRUCTIONS CAREFULL Y. THE INSTRUCTIONS ARE IN THE REGULATOR BOX. FOLLOW THE MANUFACTURER RECOMMENDATIONS. OPEN SHUTOFF VALVE ON THE INLET SIDE OF THE REGULATOR SLOWLY AND CAREFULLY TO ALLOW INLET PRESSURE TO BUILD UP SLOWL Y IN THE REGULATOR UNTIL IT IS FULL Y PRESSURIZED. OPEJNING THE SHUTOFF VALVE QUICKLY WILL DAMAGE THE REGULATOR. DO NOT EXCEED THE REGULATOR PRESSURE RA TINGS.

6. Make certain that the operator in charge is properly instructed in operation and maintenance procedures.

750-177 2-11

Chapter 2 Profire V Burner

FIRING MODES

Different modulation modes are available with the Profire V burner. The Model FLX will utilize one of the following:

Low - High -Low (60% damper purge).

Low - High -Low (open damper purge).

Full Modulation (open damper purge).

See following pages for operating descriptions of each firing mode

2-12 750-177

Profire V Burner Chapter 2

LOW-HIGH-LOW MOD - LOW or 60% DAMPER PURGE

Combustion Air Gas Oil

A two blade damper is

COMPONENTS DESCRIPTION:

controlled by a two position, spring return actuator with mechanical linkage. For 60% damper purge a mechanical stop is provided on the damper to ensure sufficient air flow is provided during prepurge. Power to drive the actuator is routed through a low/auto switch and a remote located modulating control. The actuator also contains a limit switch which is used to actuate the second stage of the oil supply system. (see oil at right).

Safety shut off valve(s) are provided to initiate the flow of gas. The primary is a diaphragm or motorized type valve which have delayed opening rates to prevent an "in rush" of gas. A butterfly type gas metering valve is linked directly to the damper actuator and provides gas flow metering during the drive to the high position. A manually adjusted gas regulator limits maximum firing rate.

Pressure Atomization: Two solenoid type safety shut off oil valves initiate the flow of oil from the high pressure pump to the nozzle. The oil pump has a built in solenoid controlled two level pressure regulating system. Low and high flow rates are set on the pump based on pressure and the nozzle's flow rating.

PRE-PURGE:

STARTUP, IGNITION:

RUN, MODULATE:

Operating Sequence

SHUT DOWN, POST-PURGE:

Damper is in its closed or low fire position. For 60% damper purge this would be against the mechanical stop.

Damper remains in its low fire starting position.

Damper is driven open in 30 seconds by the two position actuator. Low-High-Low burners will modulate from the low to high rate positions based on the signal from the modulating control and the selection of the low/auto switch.

Damper returns to its start position based on the 25 second closure speed of the mechanical actuator.

Valves are closed.

Valves open. To prevent a surge the primary gas valve opens at a slowed rate. Gas flow to the manifold is metered based on the butterfly valves low fire setting.

The gas valves remain in their open position. The actuator begins it's travel to the high fire position opening the gas metering valve. The burner will then modulate from low to high as described in the combustion air column.

On shut down all gas valves close within 1 second. The butterfly valve closes in 25 seconds with the two position actuator.

The pump is operational but the valves are closed. Oil is flowing through an internal relief valve and returning to the supply system.

Safety shut off valves open allowing oil to flow from pump to nozzle. Oil pressure at the nozzle is based on the pump's low pressure setting. Excess oil is flowing through an internal relief valve and returning to the supply system.

The safety shut-off oil valves remain open. The pump's solenoid is energized by the auxiliary switch within the damper actuator as it opens the air damper. Oil pressure is then increased based the pumps high pressure setting. The burner will then modulate from low to high as described in the combustion air column.

All valves immediately return to their startup or de-energized position. The oil pump is operating with post-purge, but oil is flowing through an internal relief valve and returning to the supply system.

For pumps without the internal dual pressure solenoid an external pressure relief valve and normally open solenoid valve are used.

VARIATIONS: None None

750-177 2-13

Chapter 2 Profire V Burner

LOW-HIGH-LOW MOD - OPEN DAMPER PURGE

Combustion Air Gas Oil

Pressure Atomization: Two solenoid type safety

shut off oil valves initiate the flow of oil from the high pressure pump to the nozzle. The oil pump has a built in solenoid controlled two level pressure regulating system. Low and high flow rates are set on the pump based on pressure and the nozzle's flow rating.

The pump is operational but the valves are closed. Oil is flowing through an internal relief valve and returning to the supply system.

The safety shut-off oil valves remain open. The pump's solenoid is energized by the aux switch within the damper actuator as it opens the air damper. Oil pressure is then increased based the pump’s high pressure setting. The actuator begins its travel to the high fire position opening the gas metering valve. The burner will modulate from low to high as described in the combustion air column.

All valves immediately return to their startup or deenergized position. The oil pump is operating with post-purge, but oil is flowing through an internal relief valve and returning to the supply system.

For pumps without the internal dual pressure solenoid an external pressure relief valve and normally open solenoid valve are used.

COMPONENTS DESCRIPTION

PRE-PURGE

STARTUP, IGNITION

RUN, MODULATE

Operating Sequence

SHUT DOWN, POST-PURGE

A two blade damper is controlled by a two position, spring return actuator with mechanical linkage. Power to drive the actuator is routed through a low/auto switch and a remote located modulating control. The actuator also contains a limit switch which is used to actuate the second stage of the oil supply system. (see oil at right) A second external switch ensures the damper has returned to the low fire position before ignition is initiated.

From its closed position the damper is driven open by the flame safeguard control where it remains for the duration of the pre-purge cycle.

Damper returns to the low fire position which is proven through the external switch. The burner is now ready for startup.

Damper is driven open in 30 seconds by the two position actuator. Low-High-Low burners will modulate from low to high rate positions based on the signal from the modulating control and the selection of the low/auto switch.

Damper returns to its start position based on the 25 second closure speed of the mechanical actuator.

Valves are closed.

Valves open. To prevent a surge the primary gas valve opens at a slowed rate. Gas flow to the manifold is metered based on the butterfly valves low fire setting.

The gas valves remain in their open position. The actuator begins its travel to the high fire position opening the gas metering valve. The burner will modulate from low to high as described in the combustion air column. On shut down all gas valves close within 1 second. The butterfly valve closes in 25 seconds with the two position actuator.

VARIATIONS None None

2-14 750-177

Profire V Burner Chapter 2

FULL MODULATION - OPEN DAMPER PURGE

Combustion Air Gas Oil

A two blade damper is controlled by a proportional modulating actuator (or

COMPONENTS DESCRIPTION

PRE-PURGE

STARTUP, IGNITION

RUN, MODULATE

Operating Sequence

SHUT DOWN, POST-PURGE

VARIATIONS:

motor) with mechanical linkage. The modulating actuator is capable of stopping at any point along its 90 degree stroke based on a signal from a remotely connected modulating control or from a burner mounted manual potentiometer which is selected through an auto/manual modulation selector switch. The actuator also contains two internal switches that ensure the damper reach the high fire and low fire positions during purge and before ignition is initiated.

From its closed position the damper is driven open by a signal from the flame safeguard control where the high fire air switch is proven. The damper will remain open for the duration of the pre-purge cycle.

Damper returns to the low fire position which is proven through the internal low fire air proving switch. The burner is now ready for startup.

Damper is driven by the modulating actuator to a firing rate position as determined by the modulating control or manual potentiometer. Actuator can complete full travel to high fire in 30 seconds. Actuator will then continue to adjust firing rate position based on signals from the modulating control until demand is satisfied.

Damper returns to its starting position based on the 30 second closure speed of the mechanical actuator during post purge.

Options are available for 4-20amp modulating signal conversion or 4-20 proportional modulating actuators. Also optional is an actuator with dual low fire start switch positions for improved "turn down" in dual fuel situations.

Safety shut off valve(s) are provided to initiate the flow of gas. The primary is a diaphragm or motorized type valve which have delayed opening rates to prevent an "in rush" of gas. A butterfly type gas metering valve is linked directly to the damper actuator and provides gas flow metering relative to the actuators position . A manually adjusted gas regulator limits maximum firing rate.

Valves are closed.

Valves open. To prevent a surge the primary gas valve opens at a slowed rate. Gas flow to the manifold is metered based on the butterfly valve low fire setting.

The gas valves remain in their open position. As the actuator begins it's travel to the firing rate position it is also adjusting the butterfly gas metering valve increasing the flow of gas to the manifold. The burner will continue to modulate as described under the combustion air heading until demand is satisfied.

On shut down all gas valves close within 1 second. The butterfly valve closes in 30 seconds with the damper actuator.

None

Pressure Atomization: Two solenoid type safety shut off oil valves initiate the flow of oil from the high pressure pump to a return flow nozzle. In the return line from the nozzle an adjustable oil metering valve limits the amount of oil allowed to return to the pump. The metering valve is connected to the damper actuator with mechanical linkage.

The pump is operational but the valves are closed. Oil is flowing through an internal relief valve and returning to the supply system.

Safety shut off valves open allowing oil to flow from pump to nozzle. Oil pressure at the nozzle is based on the pump's pressure setting less the volume of oil returning through the metering valve.

The safety shut-off oil valves remain open. As the actuator begins it's travel to the firing rate position it is also adjusting the oil metering valve decreasing the amount of oil allowed to return to the pump. This in turn is increasing the pressure and volume of oil at the nozzle. The burner will continue to modulate as described under the combustion air heading until demand is satisfied.

All valves immediately close. The metering valve opens to it's low fire position in 30 seconds with the damper actuator. The oil pump is operating with postpurge, but oil is flowing through an internal relief valve and returning to the supply system.

On models with a simplex nozzle oil is diverted from the supply line through the meter and back to the pump before the first safety shut-off valve.

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Chapter 2 Profire V Burner

PARALLEL POSITIONING

Combustion Air Gas Oil

COMPONENTS DESCRIPTION

NOTE: Parallel Positioning systems

incorporate independent actuators to control each of the fuel and air metering devices. Customizable "curves" can then be created for each actuator to optimize burner performanc e.

A two bladed damper is controlled by an independent parallel positioning actuator. The remote mounted modulating control

Safety shut off valve(s) are provided to initiate the flow of gas. The primary is a diaphragm or motorized type valve which have delayed opening rates to prevent an "in rush" of gas. A butterfly type gas metering valve is directly coupled to a parallel positioning actuator. A manually adjusted gas regulator limits maximum firing rate.

Pressure Atomization: Two solenoid type safety shut off oil valves initiate the flow of oil from the high pressure pump to a retu rn flow nozzle. In the return line from the nozzle is an adjustable oil metering valve which limits the amount of oil allowed to return to the pump. The metering valve is direct coupled to a parallel positioning actuator.

PRE-PURGE

STARTUP, IGNITION

RUN, MODULATE

Operating Sequence

SHUT DOWN, POST-PURGE

From its closed position the damper is driven open by a signal from the parallel positioning control. The damper will remain open for the duration of the prepurge cycle.

Damper returns to the low fire position in preparation for startup.

Damper is driven by its parallel positioning actuator to a firing rate position as determined by the parallel positioning control. The actuator and parallel positioning control will then continue to adjust the damper and fuel actuators position based on signals from remote sensors until demand is satisfied.

Damper returns to its closed position during or following post pu rge.

Valves are closed.

Valves open. To prevent a surge the primary gas valve opens at a slowed rate. Gas flow to the manifold is metered based on the butterfly valves low fire setting.

The gas valves remain in their open position. The metering valve and actuator increases the flow of gas to the manifold in conjunction with the opening damper however, position adjustments are made based on the fuel "curve" stored in the parallel positioning control's memory. The burner will continue to modulate as described under the combustion air heading until demand is satisfied.

On shut down all gas valves close within 1 second. The butterfly valve returns to it's starting position..

The pump is operational but the valves are closed. Oil is flowing through an internal relief valve and returning to the supply system.

Safety shut off valves open allowing oil to flow from pump to nozzle. Oil pressure at the nozzle is based on the pump's pressure setting less the volume of oil returning through the metering valve.

The safety shut-off oil valves remain open. The metering valve and actuator decreases the flow of oil returning to the pump in conjunction with the opening damper however, position adjustments are made based on the fuel "curve" stored in the parallel positioning control's memory. This in turn is increases the pressure and volume of oil at the nozzle. The burner will continue to modulate as described under the combustion air heading until demand is satisfied.

All valves immediately close. The metering valve opens to it's low fire position. The oil pump is operating with post-purge, but oil is flowing through an internal relief valve and returning to the supply system.

On models with a simplex nozzle oil is diverted from the supply line through the meter and back to the pump before the first safety shut-off valve.

Several parallel positioning

VARIATIONS

systems available. Consult the factory for types and options.

2-16 750-177

None

Profire V Burner Chapter 2

C. Startup and Operation

When the installation is complete and all electrical, fuel, water, and vent stack connections are made, make certain the connections are tight. The operator should become familiar with the burner, boiler controls and components. To identify controls and components, refer to drawings and contents of Section 1. Adjustment procedures given in Section 4 should be reviewed prior to firing. The wiring diagram should also be studied along with the operating sequence of the burner programmer. Check the electrical power supply for accordance with the nameplate specifications for all motors and controls.

Read and understand starting instructions before attempting to operate the burner. The following checks must be made:

BOILER

Check boiler water level. Be sure all boiler valves are installed correctly and positioned properly. Set the high limit control slightly above the operating control. Set operating control at the desired temperature or pressure.

BURNER

For protection in shipment, the flame safeguard control chassis is shipped unmounted. Check all screw connections before attaching flame safeguard chassis to base. The screw must be secure to assure low resistance connections. The relay chassis is mounted on the subbase with a screw which, when tightened, completes the connection between the subbase and chassis contacts. Press manual reset button to be sure safety switch contacts are closed.

Check fuses in main panel and in the burner control cabinet. Check wiring to the burner control cabinet for compliance with the wiring diagram and local codes. The control cabinet components are 120 volt. If a control transformer is supplied, ensure that the supply voltage matches its primary voltage.

Check motor rotation by momentarily closing the starter or relay. Blower rotation is clockwise when viewed from the drive end.

Check the pilot electrode setting. Refer to the Adjustment section.

Check control linkage for proper movement of the air volume damper and fuel metering components. This can be done by loosening the linkage at the actuator lever and manipulating by hand.

Check the air shutter and adjust low-fire setting. Refer to the Adjustment setting.

FIRING PREPARATIONS

Check to make certain that all plugs, connections. linkages, etc., are tight. Prior to initial firing, oil flow and pressure should be verified.

GAS BURNERS

A representative of the gas utility should turn on the gas. Determine by a test gauge upstream of the burner regulator that sufficient pressure exists at the entrance to the gas train. The gas pressure regulator must be adjusted to the pressure required and the pressure setting recorded.

On combination fuel models, set the selector switch to gas. On initial startup it is recommended that the main gas shutoff cock remain closed until the programmer has cycled through pre-purge and pilot sequences to determine that the main gas valve opens. Turn the burner switch OFF and let the programmer finish its cycle. Check to see that the gas valve closes tightly.

On burners equipped with high and low gas pressure switches, set switch pressure actuating levels and record settings for future service reference.

See the burner specification nameplate inside the control panel door for minimum and maximum input rate and required manifold pressure.

When the conditions covered above and in Section 2 are assured, the burner is ready for firing. Refer to Section E for starting and operating information.

OIL BURNERS

Prior to initial firing, oil flow and pressure should be verified. If the burner is a dual fuel model, make certain that the main gas shutoff cock is closed and the fuel selector switch is set to OIL.

OIL FLOW

If the oil supply tank is below the level of the oil fuel unit, it is recommended that the suction line be primed with oil prior to starting the pump to avoid the possibility of damage to the pump through operation without lubrication.

To check for proper pump rotation, momentarily energize the starter. With rotation verified, operate the pump to determine that oil circulation exists. Observe the oil burner pressure gauge. If not pressure shows after a few moments, stop the oil pump and re-prime. If the supply tank is lower than the pump, it is possible that the initial priming of the suction line, followed by operation of the pump, will not establish oil flow. This might be caused by obstruction in the suction line, excessive lift, inadequate priming, suction line leaks, etc. Until oil flow is established, avoid prolonged operation of the pump. If oil flow is not established after a second priming, investigation is required.

A vacuum (or compound pressure-vacuum) gauge should be installed at the suction port of the pump. It is advisable that the reading be less than 15” Hg vacuum. Vacuum in excess of this may cause unstable firing.

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Chapter 2 Profire V Burner

OIL PRESSURE AND VACUUM

If the vacuum gauge reads higher than calculated, look for restriction in the suction line, a closed valved, kinked copper tubing, plugged filter, sticking check valve, frozen oil line, undersized oil line, or excessive lift.

When there is a positive head of oil at the fuel unit, either from a gravity or by pump circulation, the pressure must not exceed 3 psi at the fuel unit suction inlet. Special pressure regulating valves are available for suction pressure above 3 psi. The fuel unit discharge pressure should be set at 300 psi.

BURNER SETTINGS

To ensure reliable and safe burner performance, the location and gap setting of the electrode for direct spark igniters, and the relative positions of the burner nozzle, diffuser, and air baffle components must be correctly set. The air damper blades must be adjusted, relative to the established flow rates to provide the correct amount of air for complete efficient combustion.

These items are preset at the factory, but must be checked prior to placing the burner into initial service, or after conducting any service work that may have altered their position.

Refer to Section 4, ADJUSTMENTS, for the instructions.

COMBUSTION SETTINGS

Fuel and air flow rates are individually adjusted at low-fire and at high-fire to achieve rated heat input, firing rate turndown, optimum efficiency, safe operation, and the ability to cope with environmental changes (including air temperature, humidity, barometric pressure), and fuel property changes. Refer to the nameplate inside the control panel for minimum and maximum fuel input ratings.

Refer to Section 4, ADJUSTMENTS, for the instructions.

TEST EQUIPMENT

The following test equipment should be on site:

6. Stack Thermometer and Thermocouples.

WARNING

DANGER

CAUTION

DANGER

TO PREVENT POSSIBLE SERIOUS INJURY OR DEATH, READ THE FLAME SAFEGUARD MANUAL AND FULLY UNDERSTAND ITS CONTENT BEFORE ATTEMPTING TO OPERATE THIS EQUIPMENT.

WARNING

DANGER

CAUTION

DANGER

SHOULD A STARTING FAILURE OCCUR FOR ANY REASON, COMBUSTIBLE FUMES MAY FILL THE COMBUSTION CHAMBER. NEVER ATTEMPT TO RE-LIGHT THE BURNER UNDER THESE CONDITIONS WITHOUT PURGING THE CHAMBER.

SEQUENCE OF OPERATION

The programming control sequences the operation of all controls and components through the starting, ignition, firing, and shutdown cycle. The burner and control system are in starting condition when:

• The operating and high limit control (temperature or pressure) are below their cutoff setting.

• All power supply switches are closed.

• Power is present at the control panel.

Refer to the manufacturer’s literature on programming controls and burner wiring diagrams for detailed information.

1. Combustion analyzer with O2 indication.

2. U-Tube manometer, or pressure gauge, to measure gas pressures (main and pilot), pressures and vacuum gauge for the oil burners.

3. Inclined manometer to measure draft pressures.

4. Smoke spot tester for oil burners and CO analyzer for gas fired units.

5. Voltmeter/Ammeter.

2-18 750-177

ELECTRICAL INTERFACE TEST

Prior to putting the burner into service, conduct the following test to ascertain that ignition spark will not cause the flame relay to pull in.

GAS FIRED

Close the pilot and main line manual gas valves. Start the burner and at time of pilot trial with just the electrical ignition system energized. The flame relay should not pull in (should not be energized).

Upon completion of successful test, proceed with startup procedures.

Profire V Burner Chapter 2

OIL FIRED

Disconnect the electrical power to the burner. Disconnect the electric oil safety shutoff valve. Reconnect electric power. Close the pilot line manual gas valve, if used.

Start burner and at the time of pilot trial, with just the electrical ignition system energized. The flame relay should not pull in.

Upon completion of successful test, disconnect power supply. Reconnect oil safety shutoff valve and turn on manual pilot gas valve. Reconnect power supply and proceed with startup procedures.

STARTUP AND OPERATING GAS BURNERS:

Performing A Gas Valve Leak Test (Bubble Test)

A gas valve leak test must also be performed on the automatic safety shutoff valves located in the main gas train prior to any initial commissioning or subsequent maintenance of the burner and gas train systems, where automatic valve proving systems interlocked with the main burner safety control are not provided. This test should be performed periodically to ensure no leakage of valves in their closed or de-energized position.

Refer to the diagram below when following this procedure. The unit should be taken out of service if the unit fails any of the following tests. Any defective part must be replaced prior to putting the equipment back into service.

WARNING

DANGER

CAUTION

DANGER

FAILURE TO FOLLOW THIS PROCEDURE MAY RESULT IN EXPLOSION, FIRE, PROPERTY DAMAGE, AND PERSONAL INJURY. THIS PROCEDURE MUST BE PERFORMED ONLY BY AUTHORIZED AND QUALIFIED PERSONNEL.

1. Close (or shut off) manual valve [7] downstream of the automatic safety shutoff valves, trapping gas pressure between the safety shutoff valves and manual valve and causing a flame failure. This should close the auxiliary safety shutoff valve [4] and main gas safety shutoff valve [5]. If both or either valve fails to close, do not proceed further until the problem is corrected.

2. Release gas pressure at the leak test cock [8B] between manual valve [7] and main gas safety shutoff valve [5], then conduct a bubble test for leak through blocking valve [5]. If no leak, close the test cock.

3. Release gas pressure at test cock [8A] and bubble test for leak through auxiliary safety shutoff valve [4]. If no leak is observed, close test cock and go to next step. If either valve leaks, correct the problem and retest 10 times before proceeding.

4. When there are no valve leaks, open manual valve [7] and relight the burner. Then close manual valve [1]. The safety shutoff and blocking valve should close due to low gas pressure.

5. Relight the burners. Reduce the high gas pressure switch [6] setpoint setting until it reaches the operating gas pressure, which should cause the auxiliary and main gas safety shutoff valves to close from high gas pressure.

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Chapter 2 Profire V Burner

Return the setpoint to its original position before proceeding.

6. Shut off the combustion air blower. This should cause a failure due to low air pressure and cause the safety valves to close.

7. Reset all manual valves to their normal setting for operation. Make sure all electric valves are operating normally. Make sure all test cocks are closed before resuming normal operation.

8. Close the downstream main and pilot gas cocks. Make sure the ON-OFF switch is in the OFF position. Actuate the manual reset button of the flame safeguard control to close the safety switch contacts.

For LOW-HIGH-OFF or LOW-HIGH-LOW and FULL MODULATION models, set the MANUAL-AUTO switch to the MANUAL position.

9. Set the manual potentiometer to low-fire position.

10. Open the gas pilot cock. Check pressure. Normal setting is 4” to 6” WC when the pilot is burning.

11. Set the ON-OFF switch to ON. The burner will start and pre-purge. After pre-purge, the ignition transformer and the gas pilot solenoid are energized.

14. When low-fire is adjusted, shut down the burner. Restart several times to be sure the low-fire setting is suitable. Readjust if necessary. Never start the burner with fuel vapor in the furnace. In case of emergency, open main power switches and close all fuel valves. After combustion adjustments are satisfactorily set, allow the heating vessel to slowly reach normal operating pressure or temperature.

15. After the boiler has reached operating temperature or pressure, turn the potentiometer switch in small increments to the high-fire position. Check high-fire at this point using combustion instruments. High-fire combustion analysis typically 3% to 4% O2. Verify maximum input rate by measuring the gas meter.

16. Do not disturb established low-fire adjustment. Allow the burner to return to low-fire position before adjusting high or intermediate settings. CO levels should be less than 400 ppm on an air-free basis at all firing rates with <50 ppm as the target value.

When conditions covered above are assured, refer to Sections F and G.

OIL BURNERS:

On initial startup it is recommended that the main gas shutoff cock remain closed until the programmer has cycled through pre-purge and pilot sequence. Then determine that the main gas valve opens. When this is confirmed, turn the burner switch OFF and let the programmer finish its cycle. Check to see that the gas valve has closed tightly.

If ignition does not occur, turn the burner switch OFF and allow the programmer to recycle for a new ignition trial.

12. Turn the burner ON and after pilot ignition when the flame relay pulls in, the slow opening, motorized, main gas valve is energized. Slowly open the downstream manual shutoff gas cock. Main flame should ignite at this time. The gas valve and air damper continue advancing until high-fire is reached.

13. Do not repeat unsuccessful light off attempts without rechecking burner and pilot adjustment. Vent fuel vapors from the combustion chamber after each unsuccessful light off attempt. Set the gas low-fire rate by adjusting butterfly valve and air linkage. Refer to the adjustment section of this manual. Using the combustion analysis instrument, adjust the low-fire. Typical combustion analysis for low-fire it 5% to 6% O2 on standard turndown systems, and between 6.5% and 9% for higher turndown systems. Verify the minimum input rate by measuring the gas meter.

1. The fuel selector switch should be set to OIL and the ON-OFF switch should be in the OFF position. Actuate the manual reset button of the flame safeguard control to close the safety switch contacts.

2. Set the ON-OFF switch to ON. The burner will start and pre-purge. After pre-purge, the ignition transformer will direct spark. If the flame detector proves the presence of a satisfactory pilot, the programmer will proceed to main flame ignition.

3. Make initial air shutter setting for smooth ignition. Return line oil pressure should be set according to Section 4 - ADJUSTMENTS. Do not repeat unsuccessful light off attempts without rechecking burner and pilot adjustment. Vent fuel vapors from the combustion chamber after each unsuccessful light off attempt. Set the oil low-fire rate by adjusting the oil return pressure and air linkage. Refer to the adjustment section. Using the combustion analysis instrument, adjust the low-fire. Typical combustion analysis for low-fire is 5% to 6% O2.

4. When low-fire is adjusted, shut down the burner. Restart several times to be sure the low-fire setting is suitable. Readjust if necessary. Never start the burner with fuel vapor in the furnace. In case of emergency, open main power switches and close all fuel valves. After combustion adjustments are satisfactorily set, allow the heating vessel to slowly reach normal operating pressure or tem-

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Profire V Burner Chapter 2

perature.

5. After the boiler has reached operating temperature or pressure, turn the potentiometer switch in small increments to the high-fire position. This will cause the metering valve to close, resulting in an increase in the oil pressure feeding the burner nozzle. In high-fire the oil metering valve should be in the fully closed position and the fuel oil pressure should be about 300 psi. Check high-fire at this point using combustion instruments. High-fire combustion analysis typically is 3.5% to 4% O2. Verify maximum input rate by measuring the oil meter if available or by weighing the oil.

6. The burner should be set up and maintained to yield smoke spot levels less than a #1 spot (ASTM D2156 Shell-Bacharach Scale) to minimize soot buildup in the boiler.

7. do not disturb established low-fire adjustment. Allow the burner to return to low-fire position before adjusting high or intermediate settings.

When conditions covered above are assured, refer to F and G of this section.

COMBINATION GAS-OIL BURNERS

In general, the combination fueled system is to be started first using oil, because, as a fuel, oil has a greater combustion air requirement than natural gas.

Refer to the Gas Burner or Oil Burner adjustment procedures and to Section 4 - ADJUSTMENTS.

Once the adjustments are set for oil, shut down the burner and restart the adjust the natural gas fuel. DO NOT READJUST THE AIR DAMPERS. The adjustment is made by balancing the fuel input rate against the existing flow of combustion air.

When conditions covered above are assured, refer to F and G of this section.

Notice: SIZE 1 & 2 COMBINATION GAS/OIL

UNITS USE A DIRECT COUPLING FROM THE BLOWER MOTOR TO THE OIL PUMP. WHEN FIRING GAS FOR AN EXTENDED PERIOD OF TIME, THE COUPLING SHOULD BE MANUALLLY REMOVED AND REPLACED ONL Y WHEN FIRING OIL. IF THE COUPLING IS LEFT CONNECTED TO THE BLOWER MOTOR, ENSURE THA T THERE IS PROPER OIL CIRCULA TION AT ALL TIMES TO AVOID DAMAGE AND SEIZURE OF THE PUMP.

In automatic operation, the operating cycle always proceeds sequentially through pre-purge, pilot ignition, main flame ignition, run and post-purge. The length of purge and ignition trial vary according to the type of programmer used.

During the run cycle, burner input is regulated to the load demand by the modulating pressure or temperature control on the boiler. The burner will continue to modulate until the operating pressure or temperature is reached.

Programmer control operation should be tested when the burner is initially placed into service, when a control is replaced, and at scheduled intervals in the maintenance program.

Refer to adjustments procedures and maintenance instructions given in Sections 4 and 5.

SHUTDOWN

When the operating limit control setting is reached or the burner switch is turned OFF, the following sequence occurs:

The fuel valve(s) de-energize and flame extinguishes. The blower motor continues running during post-purge (if so equipped with post-purge feature).

At the end of the post-purge the blower motor is de-energized. The programmer returns to its starting position and stops. Unit is ready to restart.

Abnormal shutdown might result from motor overload flame outage, low water, current or fuel supply interruption, combustion or atomizing air pressure below minimum level, tripped circuit breakers, blown fuses, or other interlock devices. Check for cause and correct before restarting burner.

Safety shutdown caused by ignition or flame failure will actuate a red indicator light and energize an audible alarm (if so equipped). If the programmer has a non-recycling interlock circuit, any interruption in this circuit during the pre-purge or firing cycle will cause a safety shutdown. This type of shutdown requires manual reset of the programming control and must be corrected before operation can be resumed.

NORMAL OPERATION

Normal operation must be with the MANUAL-AUTO switch selector on AUTO.

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Chapter 2 Profire V Burner

D. Adjustments

While each burner is tested at the factory for correct operation before shipment, variable conditions such as burning characteristics of the fuel used and operating load conditions may require further adjustment after installation to assure maximum operating efficiency.

Prior to placing the boiler into initial service, a complete inspection should be made of all controls, connecting piping, wiring, and all fastenings such as nuts, bolts, and setscrews to be sure that no damage or misadjustments occurred during shipment and installation.

A combustion efficiency analysis made during the initial startup will help to determine what additional adjustments are required in a particular installation.

COMBUSTION ADJUSTMENT ON OIL AND GAS

Efficient combustion cannot be properly judged by flame appearance, although it may help in making preliminary settings.

The proper settings of air-fuel ratios must be determined by flue gas analysis. Combustion gas analysis indicates the air to fuel ratio and the degree of complete combustion. Instruments are available to measure carbon dioxide (CO oxygen (O CO

air levels. Only O

), and carbon monoxide (CO). At no time should

measurements alone be used to indicate proper excess

measurement can definitively show

whether sufficient air has been provided for combustion.

STACK TEMPERATURE

Net stack temperature is obtained by subtracting the ambient temperature from the flue gas temperature. A high net stack temperature indicates wasted heat. Decreasing either the temperature or the volume of the flue gas, or both can reduce stack heat loss. Flue gas temperature is reduced by improving heat transfer or by reducing excess combustion air. A certain amount of excess air is necessary to complete combustion. More efficient burners require minimum excess air.

SMOKE MEASUREMENT

Smoke measurements can be made using a variety of different methods. The standards will vary somewhat according to the equipment used, and instructions accompanying the instrument should be followed.

Smoky combustion can result from:

• improper air delivery

• insufficient draft

• improper fuel viscosity

• improper fuel-air ratio

• excessive air leaks in the combustion chamber

• improper fuel oil temperature

TEST EQUIPMENT

The following test equipment should be used to set up and adjust the burner correctly:

1. Combustion analyzer with O

indication.

2. U-Tube manometer, or pressure gauge, to measure gas pressures (Main and Pilot), vacuum and pressure gauges for oil.

3. Inclined manometer to measure draft pressures.

4. Smoke spot tester for oil burners and CO analyzer for gas fired units.

5. Voltmeter/Ammeter.

6. Stack Thermometer and Thermocouples.

AIR FLOW ADJUSTMENTS

The V/Series burners have a two-blade air shutter design. Both blades are coupled together, and attached to the modulation motor. Changing the positions of the linkage rods on the linkage control arms will change the way the damper blades open and close.

COMBUSTION SETTINGS

Fuel and air flow rates are individually adjusted at low-fire and at high-fire to achieve rated input, firing rate turndown, optimum efficiency, safe operation, and the ability to cope with environmental changes (including air temperature, humidity, barometric pressure), and fuel property changes.

Turndown capability for oil is less than that for gas due to the excess air requirement of oil for clean combustion. Therefore, on combination fueled burners, gas turndown performance may be restricted (or determined) by the excess air levels set initially for oil combustion. For burners equipped with the optional Siemens modulating motor, gas turndown will not be limited to the oil setting. Each fuel will have a separate modulation range, independent of each other.

Two key components residing in flue gas are used to optimize combustion efficiency are excess air and unburned fuel. The system should be adjusted to the minimum excess air quantity that provides low levels of unburned fuel with sufficient remaining oxygen to cope with normal atmospheric and fuel related changes. Unburned fuel is measured as carbon monoxide (CO) when burning natural gas, and smoke spots when burning oil.

GAS ADJUSTMENTS

Low-fire combustion analysis typically is 6% to 9% O less than .04% CO (400 ppm). High-fire reading typically is 3% to 5% O

and less than .04% CO. The V/Series burners

and

2-22 750-177

Profire V Burner Chapter 2

are capable of operating at low excess air and less than 50 ppm CO levels at all firing rates.

FUEL OIL ADJUSTMENTS

Adjust for a “clean fire.” Typically for No. 2 oil, O 6% at low-fire and 3.5% to 4.5% at high-fire.

The burner should be setup and maintained to yield smoke spot levels less than a #1 spot (ASTM D2156 ShellBacharach Scale) to minimize soot build up in the boiler.

is 5% to

GAS PILOT FLAME ADJUSTMENT

Burner models VG-VLG and VL-60 to 168 are equipped with a gas pilot system. The gas pilot flame is regulated by adjusting the pressure setting of the pilot regulator. Normal setting is 4” to 6” W.C. when the pilot is burning. The flame must be sufficient to be proven by the flame detector and ignite the main flame. Although it is possible to visibly adjust the size of the pilot flame, obtain a proper DC volt or microamp reading of the flame signal.

The flame safeguard amplifier has a meter jack for this purpose. At initial startup and during planned maintenance, test the pilot flame signal, pilot turndown, and safety switch lockout. Refer to the flame safeguard instruction manual.

1. Lockout and tag the electrical power supply to the burner to prevent inadvertent operation during checkout or maintenance activities.

2. Disconnect the high voltage power supply from the oilspark-ignition electrodes (if installed).

3. Disconnect the oil piping from the side of the blast tube.

4. Remove the fasteners that secure the drawer to the side of the burner housing, and remove the complete assembly.

For burners with a gas pilot:

1. Disconnect the pilot line and loosen the locking screws on the pilot access cover located on the side of the blast tube.

2. Disconnect the high voltage ignition cable by pulling it straight back, away from the pilot assembly. The pilot assembly will slide back away from the diffuser.

3. Turn the assembly and retract it through the access hole.

4. Check the electrode position.

5. Re-assemble in reverse order.

WARNING

DANGER

CAUTION

DANGER

AN ULTRA-VIOLET FLAME SENSOR ELECRICAL SPARK INTERFERENCE TEST MUST BE PERFORMED AFTER FINAL ADJUSTMENT. SEE SECTION 3 OF THIS MANUAL FOR ADDITIONAL INFORMATION.

Check the pilot electrode setting. The pilot is accessible by loosening the four screws on the side of the blast tube and disconnecting the gas line.

DIRECT SPARK OIL PILOT ADJUSTMENT

Burner models VL13 to 55 are equipped with a direct spark ignition. Remove the oil drawer assembly and check electrode settings and nozzle size.

BURNER SETTINGS

To ensure reliable and safe burner performance, the location and gap setting of the electrodes, and the relative positions of the burner nozzle, diffuser, and air baffle components must be set correctly. These items are preset at the factory, but must be checked prior to placing the burner into initial service, or after conducting any service work that may have altered their position.

The nozzle/diffuser assembly must be removed from inside the burner to enable measurement and readjustment:

Figure 2-17: Electrode Position

Measure the position of the tip of the nozzle to the diffuser and compare to the following drawer assembly drawings. To adjust:

1. Loosen the locking screws on the diffuser clamp.

2. Slide the diffuser clamp along the length of the burner pipe until the correct dimension is achieved.

3. Tighten the diffuser clamp securely to the burner pipe. Apply a lock-tight type compound to the screws before tightening.

4. Carefully install the drawer assembly into the burner.

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Chapter 2 Profire V Burner

5. Re-connect the oil line and high voltage power cable to the assembly.

Measure the position of the diffuser to the air baffle and compare to the following drawer assembly drawings. To adjust:

1. Measure the distance between the leading edge of the diffuser and the front face of the inner ring on the air baffle assembly.

2. If adjustment is required, loosen the burner pipe locking setscrew located on the rear cap at the top of the fan housing, and slide the burner pipe until the correct dimension is achieved.

3. Tighten the burner pipe locking setscrew securely.

Figure 2-18: Assembly Drawing 1

Figure 2-19: Assembly Drawing 2

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Profire V Burner Chapter 2

Figure 2-20: Assembly Drawing 3

Figure 2-21: Assembly Drawing 4

Figure 2-22: Assembly Drawing 5

PILOT TURN DOWN TEST

For burners equipped with a gas pilot, conduct the following test:

1. Turn the burner switch on. This will start the blower motor and initiate the pre-purge sequence. Make sure a pressure gauge 0”-10” W.C. or manometer is installed in the pilot line to monitor the pilot gas pressure.

2. When the pilot comes on, put the programmer timer on pilot hold by placing the Run-Test switch of the flame safeguard to the “Test” position.

Refer to the flame safeguard control manual instructions.

3. Check the flame signal strength. Adjust the flame signal by increasing or decreasing pilot gas pressure with the regulator spring. Normal setting is 4” to 6” W.C.

4. Perform a pilot turndown test by reducing the pilot pressure very slowly until the scanner loses sight of the flame and give a flame lockout, then reset to normal level. Note the minimum pressure level.

5. After adjusting the pressure back to normal level, set the programmer to the “Run” position. Main flame will come on and the burner is in the low-fire position.

6. Start and stop the burner several times to ensure proper pilot setting.

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Chapter 2 Profire V Burner

ON-OFF BURNER ADJUSTMENTS

Refer to the burner data plate located inside the control panel door. The data plate will list the burner information: burner and control voltage, phase, cycle, motor amperage, maximum and minimum fuel input settings, manifold pressure (at zero furnace pressure). Add the furnace pressure to get the correct manifold pressure at maximum firing rate.

These procedures assume that the pre-startup tasks, check list, electrical interference test, and pilot turndown tests have been performed in accordance with the instructions in this manual.

Allow the boiler to fully warm up before making adjustments for most efficient combustion. Refer to the boiler instruction manual for the boiler controls settings.

GAS BURNERS

On-Off gas burners are typically equipped with a pressure regulator, and a solenoid operated diaphragm gas valve to control the on-off operation of the burner. Adjustments are made by matching the correct fuel/air ratios.

1. Open the manual gas shutoff cocks.

2. Check the gas pressure at the inlet of the regulator and the pressure downstream of the regulator. Make sure they are in accordance with the regulator specifications. The gas pressure required at the manifold is the pressure that is required to fire the burner at its rated capacity. To adjust the regulator, unscrew the cap located on top and turn the adjustment screw clockwise to increase pres-

sure, or counterclockwise to decrease pressure.

Notice: MAXIMUM VALVE INLET PRESSURE

FOR THE V4944 IS 0.5 PSI. IF LINE PRESSURE IS GREATER, AN OVER PRESSURE DEVICE IS TO BE INSTALLED DOWNSTREAM OF MAIN GAS REGULATOR (CSD-1-CF160).

3. Turn the burner switch to the “On” position.

4. Adjust the burner for a smooth ignition of the main flame. The bleed valve adjustment controls the opening of the V48 valve. When the controller is not calling for heat, the coil is de-energized. The plunger in the 3-way actuator is in the “Down” position so the bleed port is closed and the supply port is open. Gas flows into the top part of the valve. The gas pressure on top of the diaphragm, the weight, and the spring hold the valve closed. On call for heat, the controller contacts close and the coil is energized. This pulls the plunger to the “Up” position, opening the bleed port and closing the supply port. The gas in the top of the valve flows out through the bleed port. This reduces the pressure on top of the diaphragm, allowing the gas pressure below to lift the

diaphragm and open the valve.

5. Adjust the high-fire gas input to match maximum rating. Adjust the gas regulator so the manifold pressure matches the rating on the burner data plate. Verify and record the readings and pressures. High-fire is typically

3.0% to 4.0% O

with a target value of less than 50 ppm

CO.

The burner should be adjusted to provide correct fuel flow at a constant rate, as indicated on the burner data plate. This is achieved by clocking the gas flow at the gas meter. The gas utility or gas meter calibration data, should be consulted to determine the correction factors to be applied to the meter.

Natural Gas Input Calculation Using a Meter

HHV = higher heating value of gas, Btu/ft

(if no data is

available, use 1000)

CF = cubic feet of gas clocked

t = gas meter clock time, seconds

Pm = meter upstream pressure (see Pref for units)

Pb = barometric pressure (see Pref for units)

Pref = 14.696 psi, or 29.92 “HG, or 406.77” W.C.

Tref = gas reference temperature, ºF (use 77 if data unavailable)

Tg = gas temperature at meter, ºF

6. After completing all adjustments, replace the regulator gaskets and slotted aluminum screw cap. Tighten all linkages and marked settings. Complete the startup report at the end of this section.

OIL BURNERS

On-Off burners use the Suntec B2TC-8931 oil pump model. High-fire pressure adjustment is 200-300 PSI (solenoid energized), and low-fire pressure adjustment is 100-200 PSI (solenoid de-energized).

1. Briefly push in the starter contact and release to ensure that the blower motor and oil pump are rotating in the correct direction.

2. Turn the burner switch to the “On” position.

3. Make sure a pressure gauge, 0-600 PSI range, is installed, downstream of the solenoid valves. Adjust the burner for a smooth ignition of the main flame. Disconnect the wiring to the solenoid on the Suntec B2TC8931 oil pump. Loosen and remove knurled nut on the solenoid. Adjust the screw, clockwise to increase lowfire oil pressure, and counterclockwise to decrease the low-fire oil pressure, until a smooth ignition of the oil

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Profire V Burner Chapter 2

flame is obtained and a satisfactory low-fire oil flame is established. Turn burner off and restart to ensure smooth ignition is obtained at the set low-fire pressure. Replace knurled nut and hand tighten.

4. Adjust the high-fire oil input to match the maximum rating. Turn the burner off and reconnect the wiring to the solenoid valve. Restart the burner and allow burner to go through ignition and low-fire. When the solenoid energized, the oil pump discharge pressure is at high-fire pressure. The high-fire pressure adjustment screw is located on the oil pump body. Adjust the screw, clockwise to increase the pressure and counterclockwise to decrease the pressure, until correct amount of oil pressure is obtained. The high-fire oil pressure should be 300 PSI. High-fire is typically 3.5% to 4.5% O

with

less than a No. 1 smoke. The burner should be adjusted to provide the correct amount of fuel flow at a constant rate at high-fire position as indicated on the burner data plate, located inside the control panel.

COMBINATION GAS-OIL BURNERS

In general, the combination fueled system is to be started first using oil, because as a fuel, oil has a greater combustion air requirement than natural gas. After being completely adjusted for oil combustion, the burner is restarted and adjusted using natural gas as fuel. Combustion adjustment of the combination burner for natural gas involves balancing the input rate only against the existing flow of combustion air, as established initially for oil.

Do not readjust the air shutters when turning the combination burner for combustion of natural gas.

1. Turn the fuel selector switch to the “Oil” position.

2. Turn the burner switch to the “On” position.

3. Proceed with startup and adjustments using the same procedures defined in the Oil Burners section.

4. After the system has been completely adjusted for oil firing, place the burner switch “Off” and position the fuel selector switch to “Gas.”

5. Proceed with startup and adjustments using the same procedures defined in the Gas Burners section. Do not

alter the air settings set for oil.

Notice: FOR BURNERS EQUIPPED WITH A

SIEMENS MODULA TING MOTOR, FUEL/AIR ADJUSTMENTS FOR EACH FUEL ARE INDEPENDENT OF EACH OTHER. REFER TO SIEMENS MODULATING MOTOR PRODUCT LITERATURE FOR PROPER ADJUSTMENT.

LOW-HIGH-OFF & LOW-HIGH-LOW BURNER ADJUSTMENTS

These procedures assume that the pre-startup tasks, checklist, electrical interference test, and pilot turndown tests have been performed in accordance with the instructions in this manual.

Allow boiler to fully warm up before making adjustments for most efficient combustion. Refer to the boiler instruction manual for the boiler control settings.

GAS BURNERS

The gas burner adjustments on a Low-High-Off system consist of the gas pressure regulator, gas butterfly valve, low and high gas pressure switches, and air damper assembly.

The auxiliary switch inside the M436 Mod motor makes or breaks the High fire gas. The Low-High-Low boiler control energizes the M436 motor, driving it to high-fire. When the boiler control de-energizes the M436, a built-in return spring drives it to the low-fire position.

All VG-13 to 55 use a butterfly gas valve to control the gas flow to the burner. The M436 Mod motor controls the position of the valve.

1. Open the manual gas shutoff cocks.

3. Turn the burner switch to the “On” position.

4. The burner will start and be in the low-fire position.

5. After a few seconds, the O accurate reading of the O mally, O

levels are set between 4% to 6% at low-fire

for standard turndown systems on gas and 6% to 9% O for high turndown systems, with the target value of less

than 50 ppm CO. To obtain the proper readings, adjust the air shutter and low-fire regulator pressure.

6. Operate the boiler at low-fire until it is up to operating pressure (steam) or temperature (hot water).

7. Bring the burner to the high-fire position. Adjust the high-fire gas input to match maximum rating. At highfire, the butterfly valve should be near the full open

analyzer should have an

present in the flue gas. Nor-

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Chapter 2 Profire V Burner

position. Adjust the gas regulator so the manifold pressure matches the rating on the burner data plate. Verify and record the readings and pressures. High-fire is typically 3% to 4% O

with less than 50 ppm CO.

8. Adjust the low and high gas pressure switches by turning the adjusting screw until indicator moves to a pressure slightly lower than normal operating pressure for the low gas pressure switch, and slightly higher for the high gas pressure switch (usually 20% below and 20% higher than normal pressure).

9. Verify low-fire and high-fire rate by clocking the meter as previously explained.

10. After completing all adjustments, replace the regulator gaskets and slotted aluminum screw caps. Tighten all linkages and marked settings. Complete the Startup report at the end of this section.

The burner should be adjusted to provide correct fuel flow at a constant rate, at the low-fire and high-fire position as indicated on the burner data plate. This is achieved by clocking the gas flow at the gas meter. The gas utility or gas meter calibration data, should be consulted to determine the correction factors to be applied to the meter.

Natural Gas Input Calculation Using a Meter

pressure regulating valve, remove lockscrew and adjust pressure by turning the allen screw clockwise to increase pressure, and counterclockwise to reduce pressure.

3. Operate the boiler at low-fire until it is up to operating pressure (steam) or temperature (hot water).

4. Adjust the high-fire fuel input to match maximum oil pressure. At high-fire, the pressure should be 300 PSI. Verify and record the readings and pressures. High-fire is typically 3.5% to 4.5% O

with less than No. 1 smoke.

The burner should be adjusted to provide correct fuel flow at a constant rate, at the low-fire and high-fire position as indicated on the burner data plate.

5. Tighten all linkages and marked settings. Complete the Startup report at the end of this section.

COMBINATION GAS-OIL BURNERS

In general, the combination fueled system is to be started first using oil, because as a fuel, oil has a greater combustion air requirement than natural gas.After being completely adjusted for oil combustion, the burner is re-started and adjusted using natural gas as fuel. Combustion adjustment of the combination burner for natural gas involves balancing the input rate only against the existing flow of combustion air, as established initially for oil

HHV = higher heating value of gas, Btu/ft

(if no data is

available, use 1000)

CF = cubic feet of gas clocked

t = gas meter clock time, seconds

Pm = meter upstream pressure (see Pref for units)

Pb = barometric pressure (see Pref for units)

Pref = 14.696 psi, or 29.92 “HG, or 406.77” W.C.

Tref = gas reference temperature, ºF (use 77 if data unavailable)

Tg = gas temperature at meter, ºF

OIL BURNERS

The Suntec B2TD-8842 oil pump is typically incorporated and is a two-stage, two-step oil pump. The low-fire pressure adjustment is 100-200 PSI (solenoid de-energized). High-fire pressure adjustment is 200-300 PSI (solenoid energized).

1. Turn the burner switch to the “On” position.

2. Adjust low-fire with the oil pressure regulating valve to have approximately 100 to 200 PSI, and adjust the air shutter for a clean fire. Record the combustion reading from the flue gas analyzer, normally 3.5% to 4.5% O

and less than No. 1 Smoke (Bacharach). To adjust the oil

Do not readjust the air shutter when tuning the combination burner for combustion of natural gas.

1. Turn the fuel selector switch to the “Oil” position.

2. Turn the burner switch to the “On” position.

3. Proceed with startup and adjustments using the same procedures defined in the Oil Burners section.

4. After the system has been completely adjusted for oil firing, place the burner switch “Off” and position the fuel selector switch to “Gas.”

5. Proceed with startup and adjustments using the same procedures defined in the Gas Burners section. Do not alter the air settings set for oil. Correct the O

levels by

adjusting the butterfly valve for Size 2 models, and the regulators low and high pressures for Size 1 models.

FULL MODULATION BURNER ADJUSTMENTS

Refer to the burner data plate located inside the control panel door. The data plate will list the burner information: Burner and control voltage, phase, cycle, motor amperage, maximum and minimum fuel input settings, and manifold pressure (at zero furnace pressure). Add the furnace pressure to get the correct manifold pressure at maximum firing rate.

These procedures assume that the pre-startup tasks, checklist, electrical interference test, and pilot turndown tests have been performed in accordance with the instructions in this manual.

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Profire V Burner Chapter 2

Allow the boiler to fully warm up before making adjustments for most efficient combustion. Refer to the boiler instruction manual for the boiler controls settings.

GAS BURNERS

The gas burners adjustments on a full modulation burner consist of the gas pressure regulator, butterfly gas valve, low and high gas pressure switches (Model V30-168), and air dampers.

1. Open the manual gas shutoff cocks.

3. Set the Manual-Auto switch on the “Manual” position.

4. Position the manual flame control potentiometer in the CLOSED (low-fire) position.

5. Turn the burner switch to the “On” position.

6. The burner will start and be in the low-fire position.

7. After a few seconds, the O accurate reading of the O mally, O

levels are set between 4% to 6% at low-fire

analyzer should have an

present in the flue gas. Nor-

for standard turndown systems on gas and 6% to 9% O for high turndown systems, with the target value of less

than 50 ppm CO. To obtain the proper readings, adjust the gas butterfly opening and air shutters. Take note of the readings and pressures at the burner manifold and gas train.

8. Operate the boiler at low-fire until it is up to operating pressure (steam) or temperature (hot water). Then increase the fuel input to the boiler by turning the manual flame control potentiometer towards OPEN in small increments. This will cause the butterfly valve to open, allowing more gas into the burner.

9. At each point, allow the burner to operate for a few minutes before recording the O

Observe that the O

and CO levels remain within an

, CO, and pressure readings.

acceptable limit. Adjust the pressure regulator as necessary, to correct this situation. Continue to do this until the burner reaches high-fire (the potentiometer is at the OPEN position).

10. Adjust the high-fire gas input to match maximum rating. At high-fire, the butterfly valve should be near the full open position. Adjust the gas regulator so the manifold pressure matches the rating on the burner data plate. Verify and record the readings and pressures. High-fire is typically 3% to 4% O

with less than 50 ppm CO as a

target value.

11. Modulate the burner to low-fire. Verify the readings.

Natural Gas Input Calculation Using a Meter

HHV = higher heating value of gas, Btu/ft

available, use 1000)

CF = cubic feet of gas clocked

t = gas meter clock time, seconds

Pm = meter upstream pressure (see Pref for units)

Pb = barometric pressure (see Pref for units)

Pref = 14.696 psi, or 29.92 “HG, or 406.77” W.C.

Tref = gas reference temperature, ºF (use 77 if data unavailable)

Tg = gas temperature at meter, ºF

12. Adjust the low and high gas pressure switches by turn-

ing the adjusting screw until indicator moves to a pressure slightly lower than normal operating pressure for the low gas pressure switch, and slightly higher for the high gas pressure switch (usually 50% below and 50% higher than normal pressure, respectively).

13. Tighten all linkages and marked settings. Complete the Startup report at the end of this section.

14. Turn the Manual-Auto switch to “Auto.” The burner will now modulate according to the load demand to the boiler.

BURNERS EQUIPPED WITH OPTIONAL FGR VALVE FOR LOW NOx APPLICATIONS

LNV burners are equipped with an FGR (flue gas recirculation) valve to lower the NOx emissions. An adjustable cam is provided to adjust the FGR valve position throughout the firing range on gas. Follow the steps for gas above with the following additions:

1. Make sure the FGR valve is in the near closed position.

2. Start the burner up and hold at low-fire until the boiler is at the proper operating pressure or temperature.

3. With an analyzer in the stack, adjust the FGR valve cam screw to obtain sub 30 ppm NOx levels. DO NOT ADJUST BURNER BELOW 20 PPM. UNSTABLE

(if no data is

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COMBUSTION AND HIGH CO EMISSIONS WILL RESULT. Monitor O

and CO levels during this process.

The introduction of FGR into the combustion chamber will lower the flue O

levels. Too much FGR may

induce high levels of CO in the flue gas. It may be necessary to adjust the air damper blades to raise the O

proper low-fire values. If the proper NOx values can not be reached by adjusting the cam screw, the FGR linkage will have to be adjusted as well. Please see the section on linkage adjustment for details.

4. Once the low-fire setting is complete, continue with the instructions above, adjusting the cam at each screw, to obtain the proper NOx values. Verify the values modulating back to low-fire, and adjust accordingly.

OIL BURNERS

The oil burner adjustments consist of the oil metering valve and air shutters. The firing rate is regulated by a metering valve in the nozzle return line. At low-fire, the arrow on the valve points to approximately number 7, and at high-fire it is in the closed position (no return flow), approximately at number 2. The oil metering valve position will vary the oil pressure to the nozzle. An oil pressure gauge should be installed in the return line to monitor the oil pressure. Oil pressure at low fire is approximately 80 to 100 PSI and 300 PSI at high-fire. Size 1 V10 to 25 uses a simplex nozzle, sizes 2 & 3 use a return flow nozzle.

1. Set the Manual-Auto switch on the “Manual” position.

2. Place the manual flame control potentiometer in the CLOSED (low-fire) position.

3. Turn the burner switch to the “On” position.

4. The burner will start and be in the low-fire position.

5. Adjust low-fire with the metering valve position to have approximately 80 to 90 PSI, and adjust the low-fire air shutter for a clean fire. Record the combustion reading from the flue gas analyzer, normally 4.5% to 6.5% O

and less than No. 1 Smoke (Bacharach).

6. Operate the boiler at low-fire until it is up to operating pressure (steam) or temperature (hot water). Then increase the fuel input to the boiler by turning the manual flame control potentiometer towards OPEN in small increments. This will cause the metering valve to close, resulting in an increase in the oil pressure feeding the burner nozzle.

7. At each point, allow the burner to operate for a few minutes before recording the O

readings. Observe that the O

, CO, Smoke, and pressure

and CO levels remain

within an acceptable limit. Adjust the oil pressure as necessary, to correct this situation. For burners with the cam trim option, adjust the cam screws throughout the range to obtain correct O

and CO levels. Continue to do

this until the burner reaches high-fire (the potentiometer

is at the OPEN position).

8. Adjust the high-fire fuel input to match maximum oil pressure. At high-fire, the metering valve should be in the fully closed position and the pressure should be 300 PSI. Verify and record the readings and pressures. Highfire is typically 3.5% to 4.5% O

with less than No. 1

Smoke. Adjust the high-fire excess air rate using the high-fire shutter adjustment.

9. Modulate the burner to low-fire. Verify the readings once again. The burner should be adjusted to provide correct fuel flow at a constant rate, at the low-fire and high-fire positions as indicated on the burner data plate.

10. Tighten all linkages and marked settings. Complete the Startup report at the end of this section.

11. Turn the Manual-Auto switch to “Auto.” The burner will now modulate according to the load demand to the boiler.

COMBINATION GAS-OIL BURNERS

In general, the combination fueled system is to be started first using oil, because as a fuel, oil has a greater combustion air requirement than natural gas.After being completely adjusted for oil combustion, the burner is re-started and adjusted using natural gas as fuel. Combustion adjustment of the combination burner for natural gas involves balancing the input rate only against the existing flow of combustion air, as established initially for oil

Do not readjust the air shutter when tuning the combination burner for combustion of natural gas.

1. Set the Manual-Auto switch to the “Manual” position.

2. Position the manual flame control potentiometer in the CLOSED (low-fire) position.

3. Turn the fuel selector switch to the “Oil” position.

4. Turn the burner switch to the “On” position.

5. Proceed with startup and adjustments using the same procedures defined in the Oil Burners section.

6. After the system has been completely adjusted for oil firing, place the burner switch OFF, and position the fuel selector switch to “Gas.”

7. Proceed with startup and adjustments using the same procedures defined in the Gas Burners section. Do not alter the air setting set for oil. Correct the O

levels by

adjusting the butterfly valve.

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Profire V Burner Chapter 2

CAUTION

DANGER

ANY COVER PLATES, ENCLOS URES, OR GUARDS ANCHORED TO THE BURNER, OR ANY BURNER RELATED EQUIPMENT, MUST REMAIN IN POSITION AT ALL TIMES. ONLY DURING MAINTENANCE AND SERVICE SHUTDOWN CAN THESE COVER PLATES, ENCLOSURES, OR GUARDS BE ALLOWED TO BE REMOVED. THEY MUST BE REPLACED, AND SECURELY ANCHORED BEFORE TESTING, ADJUSTING, OR RUNNING THE BURNER OR BURNER RELATED EQUIPMENT.

CONTROL SYSTEM

Figure 2-23: FGR Control Valve

E. Maintenance

A maintenance program avoids unnecessary downtime, costly repairs, and promotes safety. It is recommended that a record be maintained of daily, weekly, monthly, and yearly maintenance activities.

Most operating controls require very little maintenance beyond regular inspection. Examine electrical connections. Keep the controls clean. Remove any dust from the interior of the control. Covers should be left on controls at all times. Keep the control cabinet doors closed. Dust and dirt can damage motor starters and relay contacts. Starter contacts are plated with silver and are not harmed by discoloration. Never use files or abrasive materials such as sandpaper on contact points.

Electrical and mechanical devices require systematic and periodic inspection and maintenance. Any “automatic” features do not relieve the operator from responsibility, but rather frees him from certain repetitive chores, providing time for upkeep and maintenance.

Unusual noise, improper gauge reading, leak, sign of overheating, etc. can indicate a developing malfunction requiring corrective action.

WARNING

DANGER

CAUTION

DANGER

ONLY FACTORY AUTHORIZED BURNER SERVICE PERSONNEL SHOULD START UP, ADJUST, OR SERVICE THE EQUIPMENT.

WARNING

DANGER

CAUTION

DANGER

ONLY FACTORY AUTHORIZED BURNER SERVICE PERSONNEL SHOULD ST AR T UP, ADJUST, OR SERVICE THE EQUIPMENT.

PROGRAMMING CONTROL

This control requires no adjustment, nor should any attempt be made to alter contact settings or timing logic. Those programmers with contacts may require occasional cleaning. If so, follow instructions given in the manufacturer’s bulletin. Never use abrasive materials. The manufacturer’s bulletin also contains troubleshooting information. The flame detector lens should be cleaned as often as conditions demand.

A periodic safety check procedure should be established to test the complete safeguard system. Tests should verify safety shutdown with a safety lockout upon failure to ignite the pilot or the main flame, and upon loss of flame. Each of these conditions should be checked on a scheduled basis. The safety check procedures are contained in the manufacturer’s bulletin.

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Chapter 2 Profire V Burner

MOTORS

Supply voltage to the motor must not vary more than 10% from data plate ratings. At initial startup and regularly thereafter, check the motor current with an ammeter while the burner is in high-fire position. If the reading exceeds the data plate rating plus service factor, determine the cause and correct it. In dusty locations, clean the motor regularly to assure adequate cooling. Lubricate in accordance with the manufacturer’s instructions.

GAS SYSTEM

Check the gas train for leaks. Check the gas valves and verify the ow and high gas pressure settings.

SOLENOID VALVES

A faint hum from the solenoid is normal when the coil is energized. Should the valve fail to operate, check that there is voltage at the valve coil. If there is no voltage at the coil, check for loose wiring connections. If there is proper voltage at the valve coil and the valve still fails to open, replace the coil. Refer to manufacturer’s bulletin for correct procedure in coil replacement.

Should it become necessary to replace the complete valve, be sure that the flow is in the direction of the arrow on the valve body.

Test for gas leaks and check valve action several times to ensure proper operation before attempting to relight burner.

CAUTION

DANGER

ALL POWER MUST BE DISCONNECTED

BEFORE SERVICING VALVES.

MOTORIZED MAIN GAS VALVES

Should the valve fail to operate, check for voltage at the valve. Make certain that the main shutoff cock is closed prior to testing. The actuator is not field repairable nor should it be disassembled. Replace the actuator if valve fails to operate.

After replacement, cycle the valve with the fuel shut off to determine that it opens and closes. If the valve has a visual indicator, observe its position for correct operation.

OIL SYSTEM

Little maintenance is required on the oil systems other than cleaning the oil filter. This procedure should be done at regular intervals. Increased inlet vacuum reading may indicate a clogged filter. Follow the strainer manufacturer’s maintenance schedule.

Maintenance checks on the flexible coupling between the fuel unit and motor for alignment, tightness and wear and oil piping connection tightness should also be made at regular intervals. Access the coupling by removing the airbox cover and loosening the two setscrews on the flex coupling.

The oil nozzle should be checked. Inside the nozzle lies a small screen that keeps out any particle not caught by the strainer. These particles will interfere with the normal oil flow pattern exiting the nozzle. A distorted flame can indicate a clogged nozzle. Inspect and clean the nozzle and screen. to clean the scree, swirler, and tip, unscrew the tip from the nozzle body. Clean nozzle parts in solvent. Never use wire or sharp metal tools to clean the nozzle orifice. A metal tool will distort the orifice and ruin the nozzle. Reassemble the nozzle. The tailpiece must be screwed in with the swirler seating tight against the tip to ensure proper atomization. Reassemble the nozzle into the nozzle body. If a nozzle is replaced, it must be an identical nozzle (make, size, and spray angle).

DRAWER ASSEMBLY

The drawer assembly may be removed for inspection and service.

1. Shut off burner, place switch in “Off” position.

2. Shut off all electric power to the burner.

3. Disconnect the fuel lines from the drawer assembly access cover.

4. After making note of where the bolts are located in relationship to the access cover slots, remove the drawer assembly access cover bolts. Pull the drawer partially out of the housing. Reach inside to disconnect the ignition cables from the electrodes for direct spark applications. Pull the drawer assembly completely out of the housing.

5. To reinstall the drawer assembly, insert it part way into the housing, connect the ignition cables, if applicable, and seat the assembly fully. Install the access cover bolts loosely. Slide the cover to the original location, and tighten the bolts. Reconnect the fuel lines.

IGNITION ELECTRODE, CABLE AND PILOT

Failure to keep electrodes clean and set in the proper position accounts for much faulty burner operation. Not only must the gap be correct, but the electrode points must be carefully located with respect to the nozzle. Sometimes difficulty in securing the electrodes in their clamps can be corrected by using light metal shims around the porcelain. Defective or cracked porcelains require replacement to prevent short circuiting of the spark. A gradual wearing away of the electrode tips may require re-spacing of the points or replacement of the electrode.

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Profire V Burner Chapter 2

The pilot should be checked monthly for loosening of components and carbon buildup. Before removing the pilot, ensure that the fuel supply is shut off.

On direct spark oil units, once you have removed the drawer assembly, check the electrode to nozzle gap and adjust if necessary. Refer to the drawer assembly drawings in the ADJUSTMENT section.

For burners equipped with a gas pilot, the pilot is located on the side opposite to the main gas entrance. Close the gas pilot cock. Disconnect the pilot gas supply line. Remove the screws on the pilot access plate. Disconnect the high voltage ignition cable by pulling it straight back, away from the pilot assembly. The pilot gun assembly will slide back away from the flame side of the burner. Once the pilot assembly is clear of the burner head bracket, turn the pilot assembly and retract it through the access hole. Inspect the electrode and adjust the gap if necessary. Thoroughly clean and adjust the porcelain insulated electrodes. Correct all variations from the clearance dimensions. If the insulation on the high voltage cables becomes cracked or charred, install new cables. Ignition cable should not be exposed to moisture, abrasion, or rough handling. See that the connectors are in perfect contact with the cable ends. Unscrewing the snap portion of the connector will show whether this is true.

FLAME SCANNER

The scanner must be clean. Even a small amount of contamination will reduce the flame signal. Wipe the scanner lens with a clean soft cloth. Check pilot and flame signal strength.

BURNER MOUNTING INSPECTION

The seal between the burner flange and furnace front plate must not permit combustion gasses to escape. Periodic inspection is important. If leaking occurs, refer to the INSTALLATION section for proper sealing procedure.

EXTENDED SHUTDOWN

When shutting down the burner for an extended period of time, the operator should use the following general guidelines to protect the burner from its surrounding elements.

This will add to the operating life of the burner:

1. Turn the main electrical disconnect switch to the burner to “Off.”

2. Close all main fuel valves.

3. If the burner operates in a damp environment, cover it with plastic to protect all electrical components from moisture. Remove burner control and store in a dry area.

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RECOMMENDED MAINTENANCE SCHEDULE

ITEM SERVICE BY REMARKS

DAILY

Gauges, Monitors, and Indicators Operator Make visual inspection and record readings in log.

Instrument and Equipment Settings Operator Make visual check against recommended specifications.

Low Water, Fuel Cutoff, and Alarms Operator Refer to instructions.

WEEKLY

Firing Rate Control Operator Verify factory settings.

Igniter Operator Make visual inspection. Check flame signal strength.

Pilot and Main Fuel Valves Operator Open limit switch. Make audible and visual check. Check valve

position indicators, and check fuel meters.

Flame Failure Controls Operator Close manual fuel supply for (1) pilot and (2) main fuel cock

and/or valve(s). Check safety shutdown timing. Record in log.

Flame Signal Strength Controls Operator Read and log the flame signal for both pilot and main flame.

Notify service if readings are very high, very low, or fluctuating.

Linkages Operator Check all burner linkages for tightness. Tighten if required.

MONTHLY

Low Fan Pressure Interlock Operator Manually adjust until switch opens.

High and Low Gas Pressure Interlocks Operator Refer to instructions. Manually adjust until switch opens.

Scanner and Diffuser Operator Check, inspect, and clean for soot buildup.

Pilot Assembly Operator Check for loosening of components, erosion, or carbon buildup.

QUARTERLY

Burner Mounting Flange Operator Check tightness of burner mounting flange and burner drawer.

Handhole Covers Operator Check tightness of handhole plates on upper and lower drum.

Sight Glass (steam only) Operator Check for leaks around sight glass packing nuts.

ANNUALLY

Strainer (Oil Units) Operator Replace or clean the oil strainer element.

Impeller Operator Inspect and clean the combustion impeller.

Combustion Test Service Techni-

cian

Pilot Turndown Test Service Techni-

cian

Operating Controls Service Techni-

cian

Perform complete combustion test. Adjust burner if necessary. Read and log data.

Required after any adjustment to flame, scanner, or pilot adjustment.

Refer to instructions.

2-34 750-177

Profire V Burner Chapter 2

F. Troubleshooting

PROBLEM SOLUTION

Burner Does Not Start 1. No voltage at program relay pwoer input terminals.

a. Main disconnect switch open. b. Blown control circuit fuse. c. Loose or broken electrical connection.

2. Program relay safety switch requires resetting.

3. Limit circuit not completed - no voltage at end of limit circuit program relay terminal.

a. Pressure or temperature is above setting of operation control. b. Water below required level.

•Low-water light (and alarm horn) should indicate this condition.

•Check manual reset button, if provided, on low-water control.

c. Fuel pressure must be within settings of low pressure and high pressure

switches.

d. Check burner air proving switch and high-fire limit switch.

4. High or low gas pressure - investigate and repair.

750-177 2-35

Chapter 2 Profire V Burner

PROBLEM SOLUTION

No Ignition 1. Lack of spark.

a. Electrode grounded or porcelain cracked. b. Improper electrode setting. c. Loose terminal on ignition cable, cable shorted. d. Inoperative ignition transformer. e. Insufficient or no voltage at pilot ignition circuit terminal.

2. Spark but no flame. a. Lack of fuel - no gas pressure, closed fuel valve, empty tank, broken line. b. Too much air flow. c. No voltage to pilot solenoid. d. Defective pilot solenoid. e. Improperly positioned electrode (direct spark models).

3. Low -fire switch open in low-fire proving circuit. a. Damper motor not closed, slipped cam, defective switch. b. Damper jammed or linkage binding.

4. Running interlock circuit not completed. a. Combustion proving switches defective or not properly set. b. Motor starter interlock contact not closed.

5. Flame detector defective, sight tube obstructed, or lens dirty.

PROBLEM SOLUTION

Pilot Flame, But No Main Flame 1. Insufficient pilot flame.

2. Gas fired unit. a. Manual gas cock closed. b. Main gas valve inoperative. c. Gas pressure regulator inoperative.

3. Oil fired unit. a. Oil supply cut off by obstruction, closed valve, or loss of suction. b. Supply pump inoperative c. No fuel. Broken, loose or missing oil pump coupling. d. Main oil valve inoperative. e. Check oil nozzle, gun and lines.

2-36 750-177

4. flame detector defective, sight tube obstructed or lens dirty.

5. Insufficient or no voltage at main fuel valve circuit terminal.

Profire V Burner Chapter 2

PROBLEM SOLUTION

Burner Stays in Low-Fire 1. Pressure or temperature above modulating control setting.

2. Manual-automatic switch in wrong position.

3. Inoperative modulating motor.

4. Defective modulating control.

5. Binding or loose linkages, cams, setscrews, etc.

PROBLEM SOLUTION

Shutdown Occurs During Firing 1. Loss or stoppage of fuel supply.

2. Defective fuel valve, loose electrical connection.

3. Flame detector weak or defective.

4. Scanner lens dirty or sight tube obstructed.

5. If the programmer lockout switch has not tripped, check the limit circuit for an opened safety control.

6. If the programmer lockout switch has tripped: a. Check fuel lines and valves. b. Check flame detector. c. Check for open circuit in running interlock circuit. d. The flame failure light is energized by ignition failure, main flame failu re, inad-

equate flame signal, or open control in the running interlock circuit.

7. Improper air/fuel ratio. a. Slipping linkage. b. Damper stuck open. c. Fluctuating fuel supply.

•Temporary obstruction in the fuel line.

•Temporary drop in gas pressure.

8. Interlock device inoperative or defective.

9. air in the oil lines. Bleed lines.

750-177 2-37

Chapter 2 Profire V Burner

PROBLEM SOLUTION

Modulating Motor Does Not

Operate

1. Manual-automatic switch in wrong position.

2. Linkage loose or jammed.

3. Motor does not drive to open or close during pre-purge or close on burner shut-

down. a. Motor defective. b. Loose electrical connection. c. Damper motor transformer defective.

4. Motor does not operate on demand.

a. Manual-automatic switch in wrong position. b. Modulating control improperly set or inoperative. c. Motor defective. d. Loose electrical connection. e. Damper motor transformer defective.

2-38 750-177

Profire V Burner Chapter 2

G. B u r ne r S p ec s

Model FLX Burner Characteristics

Model No.

FLX-150 1500 PFVLG-15 1 15/230/1/60 FLX-200 2000 PFVLG-20 1 15/230/1/60 FLX-250 2500 PFVLG-25 1 15/230/1/60 FLX-300 3000 PFVLG-30 1 15/230/1/60 FLX-350 3500 PFVLG-35 208/230/1/60 FLX-400 4000 PFVLG-40 208/230/1/60 FLX-450 4500 PFVLG-45 208-230/460/3/60 FLX-500 5000 PFVLG-50 230/460/3/60 FLX-550 5500 PFVLG-55 230/460/3/60 FLX-600 6000 PFVLG-60 460/3/60 FLX-700 7000 PFVLG-70 460/3/60 FLX-800 8000 PFVLG-80 460/3/60

FLX-900 9000 PFVLG-90 460/3/60 FLX-1000 10000 PFVLG-100 460/3/60 FLX-1100 11000 PFVLG-110 460/3/60 FLX-1200 12000 PFVLG-120 460/3/60

Burner Maximum

Input MBH

Burner Model

Fan Motor (3450 RPM)

Volta g e

Notes:

1. Burner model selection shown is subject to changed and is based on actual application (altitude, gas pressure, reduced NOx, etc.)

2. Standard voltage for Canadian application is 575/3/60.

3. Burner operation is Full Modulation on Elite Series and for the Econo series Low-High-Low for units 150 - 600 and modulated firing on 700 and greater.

4. Burner models shown are for combination gas/oil firing. For straight gas, delete the letter L, and for straight oil, delete the letter G.

750-177 2-39

Chapter 2 Profire V Burner

Model FLX Minimum Required Gas Pressure

Model No.

Std. Gas Train Size

(In.) Note 3

Min. Gas Pressure

(in WC) Note 4

Min. Gas Pressure

(in WC) Note 5

Burner Model

FLX-150 1 11.2 12.5 PFVG-15 FLX-200 1 19.4 21.7 PFVG-20 FLX-250 1.5 12.4 15.7 PFVG-25 FLX-300 1.5 15.9 20.7 PFVG-30 FLX-350 1.5 15.5 22.0 PFVG-35 FLX-400 1.5 18.7 27.2 PFVG-40 FLX-450 2 16.0 26.7 PFVG-45 FLX-500 2 17.6 21.0 PFVG-50 FLX-550 2 22.9 27.1 PFVG-55 FLX-600 2 20.0 24.9 PFVG-60 FLX-700 2 25.2 31.9 PFVG-70 FLX-800 2.5 19.9 22.2 PFVG-80

FLX-900 2.5 24.7 27.7 PFVG-90 FLX-1000 2.5 31.6 31.6 PFVG-100 FLX-1100 2.5 37.3 37.3 PFVG-110 FLX-1200 2.5 38.2 38.2 PFVG-120

Notes:

1. Table is based on 1,000 Btu/cu. ft. natural gas and elevation of 1,000 feet.

2. Minimum gas pressure also applies to 200 fuel series.

3. As an option, the standard gas train can be replaced with an oversized design to reduce inlet gas pressure requirements.

4. Use this column for all U.S. installations.

5. Use this column for all Canadian installations.

2-40 750-177

Profire V Burner Chapter 2

START-UP / SERVICE REPORT

The following information should be ﬁlled in by the service technician at start-up or after any adjustment to the burner.

A copy of the start-up report MUST be returned to CB in order to validate the warranty of the burner.

Burner Model Serial Number Start-up Date

GAS OIL

Test Conducted

Firing Rate MMBtu / gph

Stack Temp (Gross) oF

Room Temp oF

O2%

CO2%

CO (PPM)

NOx (PPM)

Smoke (Bacharach)

Combustion Eff.%

Stack Draft "W.C.

Furnace Pressure "W.C.

Blast tube Pressure "W.C.

Steam Pressure PSIG

Water Temperature oF

Supply oil pressure PSIG

Return oil pressure PSIG

Vacuum oil pump "HG

Oil Temperature

Atom. air pressure

Gas Pressure @ Burner Inner Manifold

Manifold "W.C. Outer Manifold

Center Gas pressure "W.C.

Gas Pressure @ Regulator Inlet PSIG

Gas Pressure @ Regulator Outlet PSIG

Pilot Gas Pressure @ Regulator Outlet "W.C.

Flame Signal Main Low 50% High

Electric Motors L1 L2 L3 L1 L2 L3

Control Voltage

Blower Motor

Air Compressor

Air-Oil or Metering

Low 50% High Low 50% High

Voltage Amperage

Control Checks Test Set Point

Low Water Cut Off

Aux. LWCO

High Water Cut Off

Operating Limit

High Limit

Operating Control

Stack Temp Interlock

Flame Failure

Combustion Air Switch

High Purge Switch

Low Fire Interlock

Oil Pressure Switch

Oil Valve with P.O.C.

Interlock

High Gas Pressure Switch

Low Gas Pressure Switch

Gas Valve P.O.C. Interlock

Pilot Turndown Test

Flame Signal Pilot

(For Low NOx Burners)

Blast Tube Temp. Interlock

FGR Line Purge Switch

FGR Valve P.O.C. Switch

Adjusted by:

Date:

Accepted by:

(Signature Required)

750-177 2-41

9028-BC

Chapter 2 Profire V Burner

2-42 750-177

CHAPTER 3

Pressure Vessel Care

A. General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

B. Water Requirements (Hot Water Boilers) . . . . . . . .3-1

C. Water Requirements (Steam Boilers . . . . . . . . . . . .3-3

D. Water Treatment . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

E. Blowdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

F. Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

G. Boilout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

H. Washing Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8

I. Periodic Inspections . . . . . . . . . . . . . . . . . . . . . . . . .3-8

J. Preparation for Extended Layup . . . . . . . . . . . . . . . .3-9

A. GENERAL

This chapter is devoted primarily to the waterside care of the pressure vessel.

Proper water supply and treatment are essential to boiler life and length of service. Proper water treatment will pay dividends in the form of longer life, less downtime, and prevention of costly repairs.

Hot water boilers require proper circulation. The system must be operated as intended by its designer in order to avoid the possibility of thermal shock with severe stress to the pressure vessel.

Although it is of prime importance, the subject of water supply and treatment cannot adequately be covered in this manual. For specific information or assistance with your water treatment requirements, contact your local CleaverBrooks authorized representative.

B. WATER REQUIREMENTS

(HOT WATER BOILERS)

Air Removal

The hot water outlet (Figure 3-1) is located in the top drum of the boiler. This location reduces the possibility of released air (which is trapped at the top of the drum) from entering the system. Any air (or oxygen) that may be released in the boiler will collect at the top of the upper drum, where it will escape

A. HOT WATER OUTLET B. AIR BLEED TAPPING C. PRESSURE/TEMPERATURE GAUGES

Figure 3-1: Upper Drum (Hot Water)

through the air vent tapping (Figure 3-1). The tapping must be properly piped to the expansion tank or a stand pipe and air bleeder to remove gases that collect at the top of the drum.

Continuous Flow

The system must be piped and the controls arranged so that there will be water circulation through the boiler under all operating conditions. Constant circulation through the boiler eliminates the possibility of stratification within the unit.

Refer to Fig. 3-1 to determine the minimum continuous flow rate through the boiler under all operating conditions.

750-177 3-1

Chapter 3 Pressure Vessel Care

DT = 20°FDT = 40°FDT = 60°FDT = 80°F DT = 100°F

MODEL

NO.

FLX-150 1.14 122.0 0.30 61.1 0.13 41.1 0.08 30.8 0.05 24.4 FLX-200 1.14 162.3 0.30 81.1 0.13 54.1 0.08 40.6 0.05 32.5 FLX-250 1.77 202.8 0.46 101.4 0.21 67.6 0.12 50.7 0.08 40.6 FLX-300 1.85 243.4 0.48 121.7 0.22 81.1 0.12 60.9 0.08 48.7 FLX-350 2.49 284.0 0.65 142.0 0.29 94.7 0.17 71.0 0.11 56.8 FLX-400 1.35 324.5 0.35 162.3 0.16 108.2 0.09 81.1 0.06 64.9 FLX-450 1.71 365.1 0.44 182.6 0.20 121.7 0.11 91.2 0.08 73.0 FLX-500 2.03 405.7 0.54 202.8 0.25 135.2 0.14 101.4 0.09 81.1 FLX-550 2.50 446.3 0.67 223.1 0.31 148.7 0.17 111.5 0.11 89.2 FLX-600 2.99 486.8 0.77 243.4 0.35 162.3 0.20 121.7 0.13 97.4 FLX-700 1.75 567.9 0.45 284.0 0.21 189.3 0.12 142.0 0.08 113.6 FLX-800 2.27 649.1 0.59 324.5 0.27 216.4 0.15 162.3 0.10 129.8 FLX-900 2.85 730.2 0.74 365.1 0.33 243.4 0.19 182.6 0.12 146.0

(PSIG)

GPM DP (PSIG) GPM DP (PSIG) GPM DP (PSIG) GPM DP (PSIG) GPM

FLX-1000 4.08 811.4 1.02 405.6 0.42 270.4 0.25 202.8 0.15 163.6 FLX-1100 4.42 892.6 1.15 446.2 0.48 297.4 0.28 223.0 0.18 178.4 FLX-1200 6.20 973.6 1.60 486.8 0.59 324.6 0.31 243.4 0.22 194.8

Table 3-1:Minimum Flow Rates for Hot Water Boilers

System Pressure

CAUTION

DANGER

In order to avoid damage to the equipment, a circulating pump should be interlocked with the burner so that the burner cannot operate unless the circulatin g pump is running.

It is recommended that the system circulating pumps be kept running, even though the heat users do not require hot water. The relief device or bypass valve will allow continuous circulation through the boiler and will help prevent rapid replacement of boiler water with “cold” zone water.

CAUTION

DANGER

The operator should determine that a circulation of water exists through the boiler before initial firing or when fi rin g af te r t he uni t has been drained and refilled. A reduced c irculation of water or no water circulation through the boiler when the burner is operating may result in damage to the equipment.

The design of the system and the usage requirements often will dictate the pressure exerted upon the boiler. Some systems are pressurized with nitrogen. Caution must be

240

230

220 210

200

190 180

170

SUPPLY WATER TEMPERA T URE -

160 150

10 12 14

16 18 20 22 24

SYSTEM PRESSURE - PSI

Figure 3-2: Minimum System Operating Pressure

3-2 750-177

Pressure Vessel Care Chapter 3

exercised to make sure that the proper relationship of pressure to temperature exists within the boiler so that all of its internal surfaces are fully wetted at all times. It is for this reason that the internal boiler pressure, as indicated on the water pressure gauge, must be held to the level shown in Figure 3-3.

It is advisable to install a thermometer in the return line to indicate return water temperature. With the return water temperature and the supply water temperature to the system known, the temperature differential will be established. Knowing the flow rate, the operator easily can detect any excessive load condition and take appropriate corrective action.

Pressure Drop

There will be a pressure drop of less than 4 psi through all standardly equipped Cleaver-Brooks boilers operating in any system that has more than the 20°F temperature drop. This drop will vary with boiler size and circulation rate. For specific information, refer to table 3-1, Minimum Flow Rates for Hot Water Boilers.

Minimum Boiler Outlet Water Temperature

The minimum recommended operating boiler outlet water temperature is 150°F. When water temperatures lower than 150°F are used, the combustion gases are reduced in temperature to a point where the water vapor in the gases condenses. A result of condensation is that fireside corrosion occurs in the boiler and breeching. The condensation problem is more severe on a unit that operates intermittently or is oversized for the actual load. This is not a matter that can be controlled by boiler design, since an efficient boiler extracts all the possible heat from the combustion gases.

Note: In order to maintain a minimum outlet water temperature of 150°F the low limit of the Operating Temperature Control should be set at least 10° higher.

If the operating water temperature going to the system must be lower than 150°F, the operating boiler outlet water temperature should still be held to a minimum of 150°F. Mixing valves are used to reduce the supply temperature going to the system.

Multiple Boiler Installations

When multiple boilers of equal or unequal size are installed, care must be taken to ensure proportional flow through the boilers. Proportional flow can best be accomplished by use of balancing cocks and gauges in the supply line from each boiler. If balancing cocks or orifice plates are used, a significant pressure drop (for example, 3-5 psi) must be taken across the balancing device to accomplish proportional flow.

Variations in water temperature and firing rates will result if care is not taken to ensure proportional flow through the boilers. In extreme cases, differences in firing rates could result in a net header water temperature below the desired temperature.

C. WATER REQUIREMENTS

(STEAM BOILERS)

Deaeration

The most important factor in the life of a steam pressure vessel is the proper conditioning of the boiler feed water. Corrosive gasses, such as oxygen and carbon dioxide, must be removed from the feed water in order to prevent degradation of the pressure vessel. For this reason CleaverBrooks recommends the use of a deaeration system as an integral part of a complete boiler installation. If circumstances do not allow the implementation of a deaeration system, then serious consideration should be given to effective alternatives such as a feed water preheater combined with a chemical oxygen scavenger. Complete boiler water chemistry parameters are given in Table 3-3.

Feed Water Supply

The internal dynamics of the Model FLX steam boilers require the capability to deliver large quantities of feed water to the boiler on demand. (Feed water inlet Figure 3-3.) Sudden changes in firing rate or operating pressure of the

Note: The minimum return water temperature through the boiler is 140°F (150°F on #2 Oil).

CAUTION

DANGER

Three-way valves and system controls should be installed or set so that the boiler cannot be bypassed. A reduced circulation of water or no water circulation through the boiler when the burner is operating may result in damage to the equipment.

750-177 3-3

FEED WATER SUPPLY PORT

Figure 3-3: Feed Water Inlet

Steam Boiler

Chapter 3 Pressure Vessel Care

BOILER MODEL 150 200 250 300 350 400 450 500 550 600 700 800 900 1000 1100 1200

Minimum Feed Rate (gpm) 4.9 6.6 8.2 9.9 11.6 13.214.916.518.219.823.126.4 29.7 33.0 36.3 39.6

Note: Feedwater to the boiler must be at least 60 °F for minimum performance; 212 °F is preferred.

Table 3-2: Minimum Boiler Feed Water Flow Rates (Steam Boiler)

Silica 150 ppm

Specific Conductance 3 50 0 μmho/cm

Total Alkalinity 300 ppm as C

Total Hardness 0 ppm as CaCO

aCO3

Oxygen (O2)7 ppb

pH 10

Total Iron 0.05 ppm

Oily Matter 1 ppm

Table 3-3: Boiler Water Quality Limits

(Steam Boilers)

boiler will initiate a “call for water” from the make-up controller, which will require that the feed water be delivered to the boiler in sufficient quantities to prevent a low water cutoff trip. Table 3-2 lists the minimum feed water flow requirements for the various boiler models. In addition, feed water must be warmed to a minimum of 60°F. in order to ensure reliable operation of the boiler. The feed water supply should be adjusted to deliver water to the boiler at or above these minimum rates.

Because of the variables involved, no one boiler compound can be considered a cure-all; nor is it advisable to experiment with homemade treating methods. A sound treatment program should include a periodic analysis of the water in the system.

The internal or waterside surfaces of the pressure vessel should be inspected at sufficient intervals to detect the presence of any corrosion, pitting, contamination, or accumulations of foreign matter. If any of these conditions are detected, contact your local Cleaver-Brooks authorized representative for advice on corrective action. It is recommended that a properly sized water meter be installed in the raw water makeup line to accurately determine the amount of raw water admitted to the boiler. It is a false assumption that a hot water boiler does not require water treatment. Even though a hot water unit generally operates on a closed system and blowdown seldom is practiced, the need remains to be alert to system water losses. Knowing the amount of makeup water admitted to the system will aid in maintaining proper waterside conditions.

E. BLOWDOWN

A steam boiler requires periodic blowdown of the boiler and water column (Figure 3-4). Blowdown is the removal of some of the concentrated water from the boiler and the water level

D. WATER TREATMENT

Properly treated boiler water will result in maximum effectiveness and long trouble-free life of the pressure vessel. Contact your local Cleaver-Brooks Representative or water management consultant for complete information on how to prevent damage resulting from inadequate water treatment.

The objectives of water treatment in general are to:

1. Prevent hard scale and soft sludge deposits that inhibit heat transfer and that could lead to overheated metal and costly downtime and repairs.

2. Eliminate corrosive gases in the supply or boiler water.

To accomplish these objectives, the boiler requires proper water treatment before and after introduction of water into the unit. The selection of pretreatment processes depends upon the water source, its chemical characteristics, the amount of makeup water needed, system operation practices, etc.

3-4 750-177

Figure 3-4: Low Water Cutoff and Gauge Glass with

Blowdown Valve

Pressure Vessel Care Chapter 3

control system, in order to lower the concentration of solids in the water.

Solids are introduced to the boiler with the feedwater, even though this water may be treated prior to use. These solids become less soluble when the water is heated and evaporated, and tend to accumulate on heating surfaces.

Periodic blowdown and chemical treatment are necessary to prevent concentration of solids in the boiler water, and attachment of these solids to waterside heating surfaces (scaling).

Scale has a low heat transfer value and acts as an insulating barrier on heating surfaces. A buildup of scale will result in lower operating efficiency and, consequently, higher fuel consumption. More importantly, scale buildup can result in overheating of boiler metal. This can result in tube failures or other pressure vessel damage.

CAUTION

DANGER

Boiler and water level control blowdown must be performed on a regular basis to ensure that concentrated solids are removed from the boiler and in order to avoid damage to the equipment.

Water column and gauge glass blowdown valves are located on the water column assembly. The boiler blowdown tapping(s) can be found at the bottom of the lower drum.

Most blowdown lines are provided with two valves. These are generally a quick-opening valve nearest the boiler and a slow-opening globe-type valve downstream. Valves will vary depending upon pressure involved and the make or manufacturer.

When initially opening the blowdown valve, open the valve slowly to heat the discharge piping. Failure to follow this procedure could result in rapid expansion and damage to the piping.

The drop of the water level in the gauge glass can be used in determining the length of time that the blowdown valve is left open. This is to be used as a reference only, as proper water analysis on a regular basis will serve as an indicator of the effectiveness of the blowdown procedures used.

Do not pump the lever action valve open and closed when draining water during blowdown. The hydraulic forces resulting from this pumping action could break the valve bodies or pipe fittings in the blowdown lines.

Blowdown valves should be closed in a specific order after draining water for blowdown. Close the downstream (slow opening) valve first, followed by the quick-opening valve next to the boiler. Open the downstream valve slightly to release the water trapped between the valves, then close the valve again.

The water column and gauge glass should be blown down by draining until the water in the gauge glass is clear. Open and close the water column and gauge glass blowdown valves slowly, allowing the water in the gauge glass to rise to a normal level before repeating the process.

CAUTION

DANGER

CAUTION

DANGER

Blowdown Procedure

Blowdown is most effective when the boiler water is hot and the burner is being fired at the lowest rate. This ensures that the water in the boiler is being circulated, and that the solids in the water are in suspension.

WARNING

DANGER

Be sure that the blowdown piping is in good condition, the discharge vents are clear of obstruction, and that the waste is piped to a safe point of discharge, in order to avoid serious personal injury or death.

If a quick-opening valve and globe-type or slow-opening valve are installed, the quick-opening valve is normally opened first and closed last. Control of the water released from the boiler is accomplished with the slow-opening valve.

750-177 3-5

Under no circumstances should a blowdown valve be left open and unattended during the blowdown operation.

Frequency of Blowdown

In practice, the boiler blowdown valve(s) should be opened periodically in accordance with a set operating schedule. Frequency and duration of the blowdown are to be determined by chemical analysis of boiler water and waterside boiler condition, as observed during regular inspections.

From an economy standpoint, frequent short blowdown is preferred to irregularly scheduled, lengthy blowdown. This is particularly true when the suspended solids content of the water is high.

Chapter 3 Pressure Vessel Care

F. CLEANING

Although it may be necessary to clean the system, information in this chapter deals primarily with cleaning the boiler under isolated conditions.

System piping connected to the boiler may contain oil, grease, or other foreign matter. These impurities must be removed to prevent damage to the heating surfaces of the pressure vessel. Chemical cleaning generally is necessary in this case and the entire system should be drained after cleaning. Consult your local Cleaver-Brooks authorized representative for recommended cleaning compounds and application procedures. For information on Boilout, see Section G, in this chapter.

Pressure Vessel

Cleaning of the waterside of the pressure vessel should be done during the course of initial installation. The waterside of the pressure vessel must be cleansed of grease, sludge, and foreign material. Such deposits will shorten the life of the pressure vessel and interfere with the efficient operation and function of control or safety devices. In addition, deposits might cause unnecessary and expensive rework, repairs, and downtime.

The pressure vessel and the hot water system represent in effect, a closed system. Although individual components of the system may already have been cleaned, it is possible that:

G. BOILOUT

Any oil, grease, or other contamination found to be present on waterside heating surfaces should be removed promptly by boiling out the unit with an alkaline detergent solution.

Note: Before boiling out, the burner must be ready for firing. Refer to CHAPTER 2 Profire V Burner.

There are several chemicals suitable for boilout. One combination often used is soda ash (sodium carbonate) and caustic soda (sodium hydroxide) at the rate of 3 to 5 pounds each per 1,000 pounds of water, along with a small amount of laundry detergent added as a wetting agent.

If the system is to be cleaned with the boiler, consider the additional water content of the system in determining the amount of chemical required. The water capacity of CleaverBrooks FLX Boilers is listed in Table 3-4.

UPPER HAND HOLE

1. The cleaning was not adequate.

2. An old system was partially or totally involved.

3. Conditions may have prevented an adequate cleaning of the piping.

Therefore, it is recommended that the entire system be cleaned, after installation of all components is completed. The pressure vessel waterside should be inspected on a periodic basis. An inspection will reveal the true internal conditions and will serve as a check against conditions indicated by chemical analysis of the boiler water. An inspection should be performed 3 months after the initial start up, then at regular 6, 9, or 12 month intervals thereafter. The frequency of periodic inspections will depend upon the internal conditions found, the particular installation, and the operating conditions that the boiler is subjected to.

If any deterioration or unusual conditions are observed, contact your local Cleaver-Brooks authorized Representative for recommendations.

150-

300-

400-

700-

Boiler Size

Water Capacity (US gal.) Hot Water

Water Capacity (US gal.) Steam - Flooded

250

350

600

91 106 174 228 269

194 215 293 464 562

900

1000-

1200

DOWNCOMER

SIGHT

PORT

SYSTEM

INLET

Figure 3-5: Rear Panel (Hot Water Boiler

Boilout Procedure

1. Prepare the boiler for firing by taking the standard precautions. Check for any situations that might present a hazard.

2. Remove upper and lower drum handhole covers and inspect all internal waterside surfaces. Remove debris and wash all internal surfaces, including tubes. It may be necessary to use a high pressure hose or a wash out lance to flush out inaccessible areas. Reinstall the lower drum

3-6 750-177

Table 3-4: Water Capacity

Pressure Vessel Care Chapter 3

handhole cover. (Use standard service gaskets during the boilout procedure.)

3. The relief valve(s) must be removed before adding the boilout solution so that neither the solution nor the contaminants that it may carry can come in contact with the valve(s). Use care in removing, handling, and reinstalling these valves.

Note: For relief valve installation information, refer to Chapter 7, “Controls.”

4. Replace glass that can be discarded after the cleaning (steam boilers).

5. An overflow pipe should be connected to one of the top boiler openings and routed to a safe point of discharge. A relief valve tapping is usually used for this purpose. The overflow connection to the boiler should incorporate a tee fitting for adding cleaning solution to the boiler.

6. Fill the unit with clean water to a point just below the access port in the upper drum. It is important that the water used for the filling process is at a temperature of 70F or above.

7. Add the boilout solution using a chemical pump.

the regular gauge glass with a temporary gauge

WARNING

DANGER

Section E.

amount being equally divided among the various manual blowdown points and continuous blowdown system. Blow the surface and/or continuous blow-down points first, followed by the other blowdown points lower on the boiler. After each blowdown cycle, the water level should be brought back to full. If the total alkalinity in the cleaning solution falls to a level below 3000 ppm, it may be necessary to add additional solution using a chemical pump.

. Allow

14. It is difficult to provide specific recommendations

15. Discontinue firing, and allow the water to cool. After

a small amount of fresh water to enter the boiler in order to create a slight overflow that will carry off surface impurities. Continue to boil and overflow until the water clears.

regarding the duration of the cleaning process. In general, a period of 18 to 36 hours will prove sufficient to internally clean the water-side of the boiler. The condition of the water blown from the boiler is the best indicator as to whether the cleaning process is complete.

letting the water cool to 120F or less, drain the boiler.

WARNING

DANGER

Be sure to drain the hot water to a safe point of discharge to avoid the possibility of scalding, serious personal injury or death.

The chemicals used in this procedure are corrosive to eyes and skin. Always refer to the Material Safety Data Sheet to ensure that the proper safety equipment and precautions are present. Failure to heed this warning could result in serious personal injury or death.

8. Reinstall the upper handhole cover.

9. Continue to fill the boiler until it is full (indicated by flow from the overflow connection).

10. Recheck the burner, gauge glass, pressure gauge, feedwater supply and the position of all valves. Make sure that all water feeding and level indicating apparatus are in proper working condition.

11. Fire the boiler intermittently at the burners lowest fire rate until the water reaches the boiling point. The water should be held at this temperature for at least five hours.

Note: Do not produce pressure in the boiler.

12. Throughout the entire process, each blow-down point or valve should be blown at least once every two hours. The total amount of water blown from all points each time should be approximately one-half gauge glass, this

16. Remove the drum handhole cover, and wash the waterside surfaces thoroughly, using a high pressure water stream. Direct the water stream into each individual tube. If possible, this washing should be done from the bottom up. A wash out lance is available from your local Cleaver-Brooks authorized representative.

17. Inspect the waterside surfaces. If they are not clean, repeat the boilout procedures.

18. Replace the handhole covers (using new gaskets) and reinstall the relief valve(s).

Note: Refer to Chapter 7, Section E, “Controls” for information regarding proper installation of relief valves.

19. If the boiler is to be put into service immediately, fill the boiler with clean, treated water and fire the burner until the water has been heated to at least 180F to drive off any dissolved gases that might otherwise corrode the metal.

20. If the boiler is not to be put into immediate service, refer to the section on boiler layup procedures in this chapter.

750-177 3-7

Chapter 3 Pressure Vessel Care

H. WASHING OUT

Depending on system integrity, feedwater quality, or operating conditions, the water side of the boiler may need to be washed out on occasion.

In theory, a hot water system and boiler that have been initially cleaned, filled with clean, treated water, and with no makeup water added, will require no further cleaning or treatment. However, minor system leaks may allow the admission of additional water or air into the boiler.

Introduction of raw (untreated) makeup water or air to a hot water boiler may lead to pitting, corrosion, or formation of sludge, sediment, or scale on the pressure vessel waterside.

The waterside condition of steam boilers can be likewise affected by feedwater quality, load demands, operating conditions, or blowdown practices.

The waterside of a hot water or steam boiler should be cleaned and inspected no later than three months after the boiler is put into service. Subsequent cleaning of waterside surfaces should be performed as indicated through periodic inspection.

In order to thoroughly wash out the waterside of the pressure vessel, the handhole covers at the ends of the upper and lower drums must be removed. The interior surfaces of the drums should be washed with a high pressure hose. Tubes should be cleaned by directing a high pressure stream of water into the end of each tube, first from the bottom, and then from the top drum.

Note: A washout lance for this purpose is available from your local Cleaver- Brooks authorized representative.

available. Be prepared to perform any testing required by the inspector, including a hydrostatic test.

When shutting down a boiler, the load should be reduced gradually and the pressure vessel should be cooled at a rate that avoids a temperature differential that can cause harmful stresses. Normally, all pressure should be relieved before a vessel is drained in order to prevent uneven contraction and temperature differential that can cause tubes to leak. Draining the unit too quickly may cause the baking of deposits that may be present on the heating surfaces.

Note: Check to see that system valves, feedwater valves, all fuel valves, expansion tank, and electrical switches are shut off prior to opening the handholes or the burner access door. After proper cooling and draining of the vessel, flush out the waterside with a high pressure water stream. Remove any scale or deposits from the waterside surfaces and check for internal or external corrosion or leakage.

Fireside surfaces also should be cleaned so that metal surfaces, welds, joints, tube fittings, and any previous repairs can be readily checked.

WARNING

DANGER

To avoid the hazard of electrical shock, which could cause serious personal injury or death, the use of a low voltage flashlight is recommended during an internal inspection.

Control and water column connections on steam boilers should be checked for accumulated deposits, and cleaned as required.

After waterside cleaning has been completed, replace the handhole covers, using new gaskets.

Note: Handhole cover gaskets are installed dry; that is, without application of a sealing compound.

I. PERIODIC INSPECTION

Insurance regulations or local codes and good maintenance will require that the pressure vessel be inspected periodically by an authorized inspector. Sufficient notice is generally required to allow removal of the boiler from service and preparation for inspection. An internal inspection may be required before cleaning or flushing.

Have the following information available for the inspector: boiler design, dimensions, generating capacity, operating pressure and temperature, time in service, defects found previously, and any repairs or modifications made to the unit. Reference records of previous inspections also should be

3-8 750-177

Fireside Inspection

Access for inspection of the firing chamber, or furnace, is gained through the hinged burner door. Inspection of the upper pass requires removal of the side casing panels and second and fourth pass cover plates. Refer to Chapter 7, Section C, “Fireside Cleaning,” for information regarding outer and inner casing removal.

Fireside tube surfaces should be checked for corrosion or accumulation of soot. Use a vacuum cleaner and wire brush to remove light corrosion or soot.

Localized, heavy corrosion on fireside tube surfaces may indicate a leaking tube or ferrule connection. If a tube or tube ferrule leak is indicated, the source of the leakage must be found and repaired before putting the boiler back in service. A leak from a tube-to-drum connection may require removal and reseating of the tube. A heavily corroded or leaking tube must be replaced in order to assure continued reliable operation of the boiler. Information regarding tube replacement can be obtained from your local Cleaver-Brooks authorized representative.

Pressure Vessel Care Chapter 3

Waterside Inspection

Check all water piping and valves for leaks, wear, corrosion, and other damage. Replace or repair the piping and valves as necessary. Inspection covers at one end of the upper and lower drums provide access to the interior of the drums for visual inspection or washout. The interior surfaces of the drums should be examined for any sign of corrosion or accumulation of deposits.

J. PREPARATION FOR EXTENDED

LAYUP

Many boilers used for heating or seasonal loads or for standby service may have extended periods of non-use. The procedures outlined in this section are designed to allow a boiler to be kept off line for any period of time without damage to the unit. Special care must be taken so that neither waterside nor fireside surfaces are allowed to deteriorate from corrosion. Operating boilers can be protected from corrosion and scale by applying various chemical treatments and monitoring the system on a regular basis. However, boilers that are taken off line, even for short intervals, are susceptible to oxygen attack. Boiler drums and/or tubes may sustain pitting type damage during either wet or dry layup if proper precautions are not taken.

Preparing The Boiler For Layup

To prepare a boiler for layup, thoroughly clean the fireside by removing any soot or other products of combustion from the tubes, exposed drum surfaces, and refractory.

CAUTION

DANGER

The insulating refractory covering the top of the bottom drum must be protected from damage when work is being done in the boiler furnace area. Damage to the insulation may eventually cause damage to the boiler itself.

Generally, a good brushing will clean fireside surfaces. Use a wire brush for metal surfaces and a soft bristle brush for the refractory. Sweep away or vacuum any accumulation.

To prevent condensation from forming in the control cabinet, keep the control circuit energized. For extended layup periods, especially where high humidity or large swings in ambient temperature occur, the flame safeguard control should be removed and stored in a dry atmosphere.

It is recommended that the burner air inlet be blocked to prevent the flow of warm, moist air through the boiler.

Oxygen solubility at ambient (off-line) temperatures can be many times that of normal boiler operating temperatures. The higher the oxygen concentration, the greater the oxygen corrosion potential. Problems also can occur as a result of improper shutdown procedures, where settled solids can dry in a hard, adherent deposit.

Care must be take to prevent fireside corrosion, especially when firing oil that contains sulfur. Dormant periods, and even frequent shutdowns, expose the fireside surfaces to condensation during cooling. Moisture and any sulfur residue can form an acid solution. Under certain conditions, and especially in areas with high humidity, the corrosive effect of the acid can be serious. An acid solution could eat through or severely damage boiler tubes or other metal heating surfaces during the time that a boiler is out of service.

Too many conditions exist to lay down definite rules for individual installations. In general, there are two methods of storage: wet or dry. Your local Cleaver-Brooks authorized representative can recommend the better method based on the circumstances of your particular installation. Regardless of the method employed, the boiler should be thoroughly cleaned and inspected prior to storage. With either method, common sense dictates a periodic recheck of fireside and waterside conditions during layup to meet the requirements of special or job site conditions.

CAUTION

DANGER

A label should be affixed to the burner advising that the air inlet has been blocked . Failure to remove the air inlet block when attempting to operate the burner may result in damage to the equipment.

Dry Storage

Dry storage generally is used for boilers that are to be out of service for some time or for boilers that might be subjected to freezing conditions. With the dry storage method, the boiler must be thoroughly dried because any moisture would cause corrosion. Drying can be accomplished by the use of a small stove or heater.

Both fireside and waterside surfaces must be cleaned of all scale, deposits, soot, and other combustion products as soon as possible after shutdown.

All openings to the pressure vessel, such as handholes or inspection ports, should be closed tightly. Feedwater and system valves should be closed. Dampers should be closed to prevent air from reaching the fireside surfaces.

Steps must be taken to eliminate moisture by placing moisture-absorbing materials on trays inside the boiler. Two moisture-absorbing materials are: quick-lime (at 2 pounds for 3 cubic feet of volume) or silica gel (at 5 pounds for 30 cubic feet of volume). As soon as the material is in place, close all boiler openings and blank all connections.

750-177 3-9

Chapter 3 Pressure Vessel Care

possibility of freezing temperatures must be considered.

WARNING

DANGER

Materials described in this section may be considered hazardous under the U.S. Occupational Safety and Health Act of 1970. Material Safety Data Sheets should be obtained and understood prior to the use of these products to avoid the possibility of serious personal injury or death.

Wet Storage

Note: It is always best to consult with a water treatment consultant before proceeding with extended layup.

Wet storage is used when the boiler will be out of service for shorter periods of time, when a boiler is held in standby conditions, or in cases where dry storage is not practical. The boiler held in wet storage can be brought back into service more quickly than one held in dry storage. However, the

Again, take care to protect metal surfaces. Because of the number of variables, it is difficult to offer definite recommendations. However, it is suggested that the pressure vessel be drained, thoroughly cleaned internally, and refilled to overflowing with treated water.

If deaerated water is not available, the unit should be fired to boil the water for a short period of time in order to drive off oxygen in the water.

Tightly close all connections and apply a small positive pressure to compensate for the vacuum that will develop as the unit cools to room temperature. Internal water pressure should be maintained at greater than atmospheric pressure. Nitrogen often is used to pressurize the vessel.

The boiler water should be tested weekly as long as the unit is in storage. Additional chemicals may be required to prevent internal corrosion. If more chemicals are added, it is desirable to circulate the boiler water for a short time by means of an external pump.

Contact your local Cleaver-Brooks authorized representative for water treatment chemicals or assistance.

3-10 750-177

CHAPTER 4

Sequence Of Operation

A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

B. Circuit And Interlock Controls . . . . . . . . . . . . . . . . 4-1

C. Sequence Of Operation - Oil Or Gas. . . . . . . . . . . .4-2

D. Flame Loss Sequence . . . . . . . . . . . . . . . . . . . . . . .4-3

A. GENERAL

Chapter 4 outlines the electrical sequencing of various controls through the pre-purge, ignition, run, and shutdown cycles of the burner.

The program relay establishes the sequence of operation and directs the operation of all other controls and components to provide an overall operating sequence.

Note: The make or model of the program relay provided will vary depending upon job specifications. The following sequence applies regardless of the make or model. Please refer to the Wiring Diagram (WD) prepared by Cleaver-Brooks for your specific installation.

Abbreviations for the various electrical components are listed in Figure 4-1. The sequences outlined in Chapter 4 employ specific nomenclature to aid in applying the text to the wiring diagram.

The burner and control system are in starting condition when the following conditions exist:

• Boiler water is up to the correct level, closing the lowwater cutoff switch.

• The low-water light (panel) is off.

• The operating limit pressure control (steam boiler) or the operating limit temperature control (hot water boiler) and high limit pressure or temperature control are below their cutoff setting.

• All applicable limits are correct for burner operation.

• The load demand light glows.

All entrance switches are closed and power is present at the line terminals of:

• Blower motor starter

• Oil pump motor starter (if provided).

The sequences do not attempt to correlate the action of the fuel supply system or feedwater system except for the

interlock controls that directly relate to the action of the

program relay. Chapters 5 and 6 contain operating

instructions and specific information on setting and adjusting the controls.

B. CIRCUIT AND INTERLOCK

CONTROLS

The burner control circuit is a two-wire system designed for 115 Vac, 60 Hz, single-phase power.

The electrical portion of the boiler is made up of individual circuits with controls that are wired in a manner designed to provide a safe workable system. The program relay provides connection points for the interconnection of the various circuits.

The controls used vary depending upon the fuel oil or gas and the specific requirement of applicable regulatory bodies. Refer to the boiler wiring diagram to determine the actual controls provided. The circuits and controls normally used in the circuits follow and are referred to in the following sequence of operation.

Limit Circuit:

• Burner switch (BS)

• Operating limit control (OLC) - pressure or temperature

• High limit control (HLC) - pressure or temperature

• Low-water cutoff (LWCO)

• Gas-oil selector switch (GOS) - (Combination burner only)

• Low gas pressures switch (LGPS)

• High gas pressure switch (HGPS)

Fuel valve interlock circuit

• Main gas valve auxiliary switch (MGVAS)

• Oil valve auxiliary switch (OVAS)

750-177 4-1

Chapter 4 Sequence Of Operation

Blower Motor Starter Circuit

• Blower motor starter (BMS)

Running lnterlock Circuit

• Blower motor starter interlock (BMSI)

• Combustion air proving switch (CAPS)

Low Fire Proving Circuit

• Low fire switch (LFS)

Pilot Ignition Circuit

• Gas pilot valve (GPV)

• Ignition transformer (IT)

• Gas pilot vent valve (GPVV) (if provided)

Flame Detector Circuit

• Flame detector (FD)

• Main fuel valve circuit

• Main gas valve (MGV)

• Main gas vent valve (MGVV) (if provided)

• Oil valve (OV)

• Main fuel valve light (FVL)

Firing Rate Circuit

• Damper motor transformer (DMT)

• Modulating damper motor (MDM)

• Manual-automatic switch (MAS)

• Manual flame control (MFC)

• Modulating control (MC)

To comply with requirements of insurance underwriters such as Factory Mutual (FM), Industrial Risk Insurers (IRI) or others, additional interlock devices may be used in addition to the circuits mentioned in Section B.

High Fire Proving Circuit

• High fire switch (HFS)

C. SEQUENCE OF OPERATION - OIL

OR GAS

On a combination fuel unit, the gas/oil switch must be set for the proper fuel.

The following sequence occurs with power present at the program relay (PR) input terminals and with all other operating conditions satisfied.

Pre-Purge Cycle - When the burner switch (BS) is turned

“on,” and controls wired in the “limit” and “fuel valve interlock” circuits are closed and no flame signal is present, the “blower motor start circuit” is powered energizing the blower motor starter (BMS). The load demand light (LDL) turns on.

At the same time, the program relay signals the modulating damper motor (MDM) to open the air damper. The damper begins to open and drives to its full open or high fire position. Opening the damper motor allows a flow of purging air through the boiler prior to the ignition cycle.

On certain boilers the circuitry will include a high fire switch (HFS). The purpose of the switch is to prove that the modulating damper motor (MDM) has driven the damper to the open position during the pre-purge cycle. In this instance, the “high fire proving circuit” is utilized.

The controls wired into the “running interlock circuit” must be closed within 10 seconds after the start sequence. In the event any of the controls are not closed at this time, or if they subsequently open, the program relay will go into a safety shutdown.

At the completion of the high fire purge period, the program relay signals the modulating damper motor (MDM) to drive the air damper to its low fire position.

To assure that the system is in low fire position prior to ignition, the low fire switch (LFS) must be closed to complete the “low fire proving circuit.” The sequence will stop and hold until the modulating damper motor (MDM) has returned to the low fire position and the contacts of the low fire switch (LFS) are closed. Once the low fire switch is closed, the sequence is allowed to continue.

Note: The ignition trial cannot be started if flame or a flame simulating condition is sensed during the pre-purge period. A safety shutdown will occur if flame is sensed at this time.

Running Interlock and Limit Circuit

• Low oil pressure switch (LOPS)

• High oil pressure switch (HOPS)

• Auxiliary low-water cutoff (ALWCO)

4-2 750-177

Ignition Cycle - The ignition transformer (IT) and gas pilot

valve (GPV) are energized from the appropriate pilot ignition terminal.

Note: An oil-fired burner may be equipped with a direct spark rather than a gas pilot. The ignition sequence of both is identical.

Sequence Of Operation Chapter 4

The pilot flame must be established and proven by the flame detector (FD) within a 10 second period in order for the ignition cycle to continue. If for any reason this does not happen, the system will shut down and safety lockout will occur.

Note: Depending upon the requirements of the regulatory body, insurer or fuel being burned, either the 10 or 15 second pilot ignition terminal may be used. Both provide the same function but differ in time interval allowed for proving main flame ignition. Refer to the boiler wiring diagram.

With a proven pilot, the main fuel valve(s) (OV or MGV) is energized and the main fuel valve light (FVL) in the panel is lighted. The main flame is ignited and the trial period for proving the main flame begins. It lasts 10 seconds for light oil and natural gas. At the end of the proving period, if the flame detector still detects main flame, the ignition transformer and pilot valve are deenergized and pilot flame is extinguished.

Note: If the main flame does not light, or stay lit, the fuel valve will close. The safety switch will trip to lock out the control. Refer to flame loss sequence (section D) for description of action.

the pressure vessel metal and refractory to undesirable conditions.

The burner starting cycle is now complete. The (LDL) and (FVL) lights on the panel remain lit. Demand firing continues as required by load conditions.

Burner Shudown-Post Purge - The burner will fire until

steam pressure or water temperature in excess of demand is generated. With modulated firing, the modulating damper motor (MDM) should return to the low fire position before the operating limit control (OLC) opens. When the limit control circuit is opened, the following sequence occurs:

The main fuel valve circuit is deenergized, causing the main fuel valve (MGV) or (OV) to close. The flame is extinguished. The control panel lights (LDL) and (FVL) are turned off. The blower motor continues to run to force air through the boiler for the post purge period.

The blower motor start circuit is deenergized at the end of the post purge cycle and the shutdown cycle is complete.

The program relay is now ready for subsequent recycling, and when steam pressure or water temperature drops to close the contacts of the operating control, the burner again goes through its normal starting and operating cycle.

WARNING

DANGER

The cause for loss of flame or any other unusual condition should be investigated and corrected before attempting to restart. Failure to follow these instructions could result in serious personal injury or death

Run Cycle - With main flame established, the program relay

releases the modulating damper motor (MDM) from its low fire position to control by either the manual flame control (MFC) or the modulating control (MC), depending upon the position of the manual-automatic switch (MAS). This allows operation in ranges above low fire.

With the manual-automatic switch (MAS) set at automatic, subsequent modulated firing will be at the command of the modulating control (MC), which governs the position of the modulating damper motor (MDM). The air damper and fuel valves are actuated by the motor through a linkage and cam assembly to provide modulated firing rates.

Note: Normal operation of the burner should be with the manual-automatic switch in the automatic position and under the direction of the modulating control. The manual position is provided for initial adjustment of the burner over the entire firing range. When a shutdown occurs while operating in the manual position at other than low fire, the damper will not be in a closed position, thus allowing more air than desired to flow through the boiler. Excess air flow subjects

D. FLAME LOSS SEQUENCE

The program relay will recycle automatically each time the operating control closes, or after a power failure. It will lockout following a safety shutdown caused by failure to ignite the pilot, or the main flame, or by loss of flame. Lockout will also occur if flame or flame simulating condition occurs during the prepurge period.

The control will prevent start-up or ignition if limit circuit controls or fuel valve interlocks are open. The control will lock out upon any abnormal condition affecting air supervisory controls wired in the running interlock circuit.

CAUTION

DANGER

The lockout switch must be manually reset following a safety shutdown. The cause for loss of flame or any unusual condition should be investigated and corrected before attempting to restart. Failure to follow these instructions could cause damage to the equipment.

1. No pilot flame.

The pilot flame must be ignited and proven within a 10second period after the ignition cycle begins. If not proven within this period, the main fuel valve circuit will not be powered and the fuel valve(s) will not be energized. The ignition circuit is immediately deenergized and the pilot valve closes, the reset switch lights and lockout occurs immediately.

750-177 4-3

Chapter 4 Sequence Of Operation

The blower motor will continue to operate. The flame failure light and the alarm bell (optional) are energized 10 seconds later.

The blower motor will be deenergized. The lockout switch must be manually reset before operation can be resumed. (Refer to the previous caution.)

2. Pilot but no main flame.

When the pilot flame is proven, the main fuel valve circuit is energized. Depending upon the length of the trial-for-ignition period, the pilot flame will be extinguished 10 or 15 seconds later. The flame detecting circuit will respond to deenergize the main fuel valve circuit within 2 to 4 seconds to stop the flow of fuel. The reset switch lights and lockout occurs immediately. The blower motor will continue to operate.

The flame failure light and alarm bell (optional) are energized 10 seconds later.

The blower motor will be then deenergized. The lockout switch must be manually reset before operation can be resumed. (Refer to the previous caution.)

3. Loss of flame.

If a flame outage occurs during normal operation and/or the flame is no longer sensed by the detector, the flame relay will trip within 2 to 4 seconds to deenergize the fuel valve circuit and shut off the fuel flow. The reset switch lights and lockout occurs immediately. The blower motor continues operation. The flame failure light and alarm bell (optional) are energized 10 seconds later.

Preventive maintenance and scheduled inspection of all components should be followed. Periodic checking of the relay is recommended to see that a safety lockout will occur under conditions of failure to ignite either pilot or main flame, or from loss of flame.

The blower motor will be deenergized. The lockout switch must be manually reset before operation can be resumed. (Refer to the previous caution.)

If the burner will not start, or upon a safety lockout, the trouble shooting section in the operating manual and the technical bulletin should be referred to for assistance in pinpointing problems that may not be readily apparent.

The program relay has the capability to self-diagnose and to display a code or message that indicates the failure condition. Refer to the control bulletin for specifics and suggested remedies. Familiarity with the program relay and other controls in the system can be obtained by studying the contents of the manual and this bulletin.

Knowledge of the system and its controls will make troubleshooting much easier. Costly down time or delays can be prevented by systematic checks of the actual operation against the normal sequence to determine the stage at which performance deviates from normal. Following a routine may possibly eliminate overlooking an obvious condition, often one that is relatively simple to correct.

Remember, a safety device, for the most part, is doing its job when it shuts down or refuses to operate. Never

attempt to

circumvent any of the safety features.

4-4 750-177

Sequence Of Operation Chapter 4

MNEMONIC DESCRIPTION

A Amber (Color Of Pilot Light) AAFL Atomizing Air Failure Light AAFR Atomizing Air Failure Relay AAPL Atomizing Air Proven Light AAPS Atomizing Air Proving Switch AAPS-B Atomizing Air Proving Switch- Burner AAPS-C Atomizing Air Proving Switch- Compressor AASS Atomizing Air Selector Switch AB Alarm Bell ACCR Air Compressor Control Relay ACM Air Compressor Motor ACMCB Air Compr essor Motor Circuit Breaker ACMF Air Compressor Motor Fuses ACMS Air Compressor Motor Starter ACMSI Air Compressor Motor Starter Interlock AH Alarm Horn ALFR Assured Low Fire Relay ALWCO Auxiliary Low Water Cutoff AM Ammeter AMS Atomizing Media Switch AOV Auxiliary Oil Valve APR Air Purge Relay APV Air Purge Valve AR Alarm Relay AS Auxiliary Switch (Suffix) ASR Alarm Silencing Relay ASS Alarm Silencing Switch ASV Atomizing Steam Valve AT Annunciator Transformer AWCBDS Auxiliary Water Column Blowdown Switch

B Blue (Color of Pilot Light) BC Bias Control BDCS Breeching Damper Closed Switch BDOS Breeching Damper Open Switch BDRS Blowdown/Reset Switch BFPL Boiler Feed Pump Light BFPM Boiler Feed Pump Motor BFPMCB Boiler Feed Pump Motor Circuit Breaker BFPMF Boiler Feed Pump Motor Fuses BFPMS Boiler Feed Pump Motor Starter BFPS Boiler Feed Pump Switch BFTS Back Flow Temperature Switch BHS Boiler - Header Switch BIOL Boiler in Operation Light BIOR Boiler In Operation Relay BM Blower Motor BMCB Blower Motor Circuit Breaker BMCR Blower Motor Control Relay BMF Blower Motor Fuses BMPR Blower Motor Power Relay BMPS Blower Motor Purge Switch BMR Blower Motor Relay BMS Blower Motor Starter BMSI Blower Motor Starter Interlock BMSS Boiler Master Selector Switch

Figure 4-1: Electrical Nomenclature

MNEMONIC DESCRIPTION

BS Burner Switch BSS Boiler Selector Switch BWPM Booster Water Pump Motor BWT Booster Water Thermostat

CAFL Combustion Air Failure Light CAFR Combustion Air Failure Relay CAP Capacitor CAPS Combustion Air Proving Switch CCCB Control Circuit - Circuit Breaker CCF Control Circuit Fuse CCRS Control Circuit Reset Switch CCT Control Circuit Transformer CIPL Changeover In Progress Light CL Canopy Light CLS Canopy Light Switch COPS Changeover Pressure Switch COR Changeover Relay COTD Changeover Time Delay CPOL Control Power on Light CR Control Relay CSSS Control System Selector Switch CWPM Circulating Water Pump Motor CWPMCB Circulating Water Pump Motor Circuit Breaker CWPMF Circulating Water Pump Motor Fuses CWPMS Circulating Water Pump Motor Starter CWPMSI Circulating Water Pump Motor Starter Interlock CWPR Circulating Water Pump Relay CWPS Circulating Water Pump Switch CWSV Cooling Water Solenoid Valve

D Denotes Digester Gas Equipment (Prefix) DCVM Direct Current Voltmeter DG Draft Gauge DGHPV Digester Gas Housing Purge Valve DHWC Deaerator High Water Control DHWL Deaerator High Water Light DHWR Deaerator High Water Relay DISC Disconnect (Entrance Switch) DLWC Deaerator Low Water Control DLWL Deaerator Low Water Light DLWR Deaerator Low Water Relay DM Damper Motor DMT Damper Motor Transformer DNS Day-Night Switch DODE Delay On Deenergization (Timer) DOE Delay On Energization (Timer) DPS Damper Positioning Switch DS Door Switch

EDS Emergency Door Switch ESS Emergency Stop Switch ETM Elapsed Time Meter

FADM Fresh Air Damper Motor FADR Fresh Air Damper Relay FD Flame Detector

750-177 4-5

Chapter 4 Sequence Of Operation

MNEMONIC DESCRIPTION

FDJB Flame Detector Junction Box FDPS Flow Differential Pressure Switch FFA Flame Failure Alarm FFL Flame Failure Light FFR Flame Failure Relay FGR Flue Gas Recirculation FGRCDTD Flue Gas Recirculation Cool Down Time Delay FGRCPS Flue Gas Recirculation Cam Position Switch FGRFM Flue Gas Recirculation Fan Motor FGRFMS Flue Gas Recirculation Fan Motor Starter FGRFMSI Flue Gas Recirculation Fan Motor Starter Interlock FGRMVLS Flue Gas Recirculation Manual Valve Limit Switch FGRTD Flue Gas Recirculation Time Delay FORS First Out Reset Switch FPM Feed Pump Motor FPMS Feed Pump Motor Starter FPR Feed Pump Relay FPS Feed Pump Switch FRI Firing Rate Interface FRP Firing Rate Potentiometer (O2 Trim) FS Flow Switch FSS Fuel Selector Switch FSSM Flame Signal Strength Meter FVEL Fuel Valve Energized Light FVL Fuel Valve Light FVR Fuel Valve Relay FWC Feed Water Control FWVT Feed Water Valve Transformer

G Green (Color Of Pilot Light) GGL Gauge Glass Light GOL Gas Operation Light GOR Gas-Oil Relay GOS Gas-Oil Switch GOR Gas-Oil Relay GPS Gas Pressure Sensor GPV Gas Pilot Valve GPVV Gas Pilot Vent Valve GR Gas Relay GSSV Gas Sensor Solenoid Valve GVEL Gas Valve Energized Light GVTS Gas Valve Test Switch

HATC High Ambient Temperature Control HBWTC High Boiler Water Temperature Control HBWTL High Boiler Water Temperature Light HFAV High Fire Air Valve HFGV High Fire Gas Valve HFL High Fire Light HFOV High Fire Oil Valve HFPS High Furnace Pressure Switch HFS High Fire Switch HFS-A High Fire Switch - Air HGPL High Gas Pressure Light HGPR High Gas Pressure Relay HGPS High Gas Pressure Switch HHFL Header High Fire Light

MNEMONIC DESCRIPTION

H/LWA High Low Water Alarm HLC High Limit Control HLFC High-Low Fire Control HLPC High Limit Pressure Control HLTC High Limit Temperature Control HMC Header Modulating Control HOPL High Oil Pressure Light HOPR High Oil Pressure Relay HOPS High Oil Pressure Switch HOLC Header Operating Limit Control HOTL High Oil Temperature Light HOTR High Oil Temperature Relay HOTS High Oil Temperature Switch HPCO High Pressure Cutoff HSPC High Steam Pressure Control HSPL High Steam Pressure Light HSPR High Steam Pressure Relay HSTC High Stack Temperature Control HSTL High Stack Temperature Light HSTS High Stack Temperature Switch HWAR High Water Alarm Relay HWC High Water Control HWCO High Water Cutoff HWL High Water Light

(I.C.) Instantaneously Closed (I.O.) Instantaneously Open IL Ignition Light INT Interval (Timer) IR Ignition Relay IT Ignition Transformer

JPP Jackshaft Position Potentiometer

LAMPS Low Atomizing Media Pressure Switch LASPS Low Atomizing Steam Pressure Switch LDL Load Demand Light LDPS Low Differential Pressure Switch LDS Low Draft Switch LFAV Low Fire Air Valve LFGV Low Fire Gas Valve LFHTD Low Fire Hold Time Delay LFL Low Fire Light LFOV Low Fire Oil Valve LFPS Low Fire Pressure Switch LFR Low Fire Relay LFS Low Fire Switch LFS-A Low Fire Switch - Air LFS-F Low Fire Switch - Fuel LFS-G Low Fire Switch - Gas LFS-O Low Fire Switch - Oil LFTC Low Fire Temperature Control LGPL Low Gas Pressure Light LGPR Low Gas Pressure Relay LGPS Low Gas Pressure Switch LIAPS Low Instrument Air Pressure Switch LLPC Low Limit Pressure Control

Figure 4-1: Electrical Nomenclature (Continued)

4-6 750-177

Sequence Of Operation Chapter 4

MNEMONIC DESCRIPTION

LLPR Low Limit Pressure Relay LLR Lead Lag Relay LLTC Low Limit Temperature Control LLTR Low Limit Temperature Relay LOPL Low Oil Pressure Light LOPR Low Oil Pressure Relay LOPS Low Oil Pressure Switch LOTL Low Oil Temperature Light LOTR Low Oil Temperature Relay LOTS Low Oil Temperature Switch LPAPS Low Plant Air Pressure Switch LPCO Low Pressure Cutoff LPS Low Pressure Switch LSPAR Low Steam Pressure Alarm Relay LSPC Low Steam Pressure Control LSPL Low Steam Pressure Light LSPR Low Steam Pressure Relay LSPS Low Steam Pressure Switch LTS Lamp Test Switch LWA Low Water Alarm LWAR Low Water Alarm Relay LWCO Low Water Cutoff LWFL Low Water Flow Light LWL Low Water Light LWR Low Water Relay LWRR Low Water Reset Relay

MA Milli-amp MAS Manual - Automatic Switch MAM Micrometer MC Modulating Control MCS Manual Control Switch MDM Modulating Damper Motor MDMAS Modulating Damper Motor Auxiliary Switch MFC Manual Flame Control (Potentiometer) MFGRTS Minimum Flue Gas Recirculation Temperature Switch MFVL Main Fuel Valve Light MFWV Motorized Feed Water Valve MGV Main Gas Valve MGVAS Main Gas Valve Auxiliary Switch MGVEL Main Gas Valve Energized Light MGVV Main Gas Vent Valve MLC Modulating Level Control (MOM) Momentary MOV Main Oil Valve MOVAS Main Oil Valve Auxiliary Switch MOVEL Main Oil Valve Energized Light MPC Modulating Pressure Control MPCB Main Power Circuit Breaker MPP Manual Positioning Potentiometer (MR) Manual Reset MTC Modulating Temperature Control MVA Make-Up Valve Actuator

N Denotes Natural Gas Equipment (Prefix) (N.C.) Normally Closed (N.O.) Normally Open NFL No Flow Light

MNEMONIC DESCRIPTION

NFR No Flow Relay NGHPV Natural Gas Housing Purge Valve

ODA Outlet Damper Actuator ODM Outlet Damper Motor ODMAS Outlet Damper Motor Auxiliary Switch ODMT Outlet Damper Motor Transformer ODS Oil Drawer Switch OH Oil Heater OHCB Oil Heater Circuit Breaker OHF Oil Heater Fuses OHR Oil Heater Relay OHS Oil Heater Switch OHT Oil Heater Thermostat OLC Operating Limit Control OLPC Operating Limit Pressure Control OL’S Thermal Overloads OLTC Operating Limit Temperature Control OMPM Oil Metering Pump Motor OMPMF Oil Metering Pump Motor Fuse OOL Oil Operation Light OPM Oil Pump Motor OPMCB Oil Pump Motor Circuit Breaker OPMF Oil Pump Motor Fuses OPMS Oil Pump Motor Starter OPPM Oil Purge Pump Motor OPR OIl Purge Relay OPRL Oil Pump Running Light OPRS Oil Pressure Sensor OPS Oil Pump Switch OPSPM Oil Pump Supply Pump Motor OPV Oil Purge Valve OR Oil Relay ORV Oil Return Valve OSOV Oil Shutoff Valve OSPS O2 Set Point Switch OSS Oil Selector Switch OT Outdoor Thermostat OTS Oil Temperature Sensor OV Oil Valve OVAS Oil Valve Auxiliary Switch OVEL Oil Valve Energized Light

P Denotes Propane Gas Equipment (Prefix) PAASV Plant Air Atomizing Solenoid Valve PAPS Purge Air Proving Switch PC Pump Control PCL Purge Complete Light PCR Pump Control Relay PFCC Power Factor Correction Capacitor PFFL Pilot Flame Failure Light PFFR Pilot Flame Failure Relay PFPS Positive Furnace Pressure Switch PHGPS Pilot High Gas Pressure Switch PIPL Purge in Progress Light PIS Pilot Ignition Switch PLC Programmable Logic Controller PLGPS Pilot Low Gas Pressure Switch

750-177 4-7

Figure 4-1: Electrical Nomenclature (Continued)

Chapter 4 Sequence Of Operation

MNEMONIC DESCRIPTION

POL Power On Light POV Pilot Oil Valve PPL Pre-Purging Light PPR Post Purge Relay PPTD Post Purge Time Delay PR Program Relay PRL Purge Ready Light PRPTD Pre-Purge Time Delay PR Program Relay PRPTD Per-Purge Time Delay PS Power Supply PSF Power Supply Fuse PSS Pump Selector Switch PSV Purge Solenoid Valve PT Purge Timer PTS Pump Transfer Switch PUCR Purge Complete Relay PUR Purge Relay

R Red (Color of Pilot Light) RAR Remote Alarm Relay RATD Remote Alarm Time Delay RES Resistor RML Run Mode Light RMR Release To Modulate Relay RS Range Switch RSR Remote Start Relay RTD Resistance Temperature Detector

SBFPL Stand By Feed Pump Light SBFPM Stand By Feed Pump Motor SBFPMCB Stand By Feed Pump Motor Circuit Breaker SBFPMF Stand By Feed Pump Motor Fuses SBFPMS Stand By Feed Pump Motor Starter SBOV Surface Blow Off Valve SBPS Sootblower Pressure Switch SBR Sootblower Relay SC Scanner SCTS Supervisory Cock Test Switch SDL Steam Demand Light SHT Steam Heater Thermostat SHV Steam Heater Valve SLCL Safety Limits Complete Light SPIR System Pump Interlock Relay SPS Steam Pressure Sensor SS Selector Switch SSC Sequencing Step Controller SSL Safety Shutdown Light SSR Solid State Relay SSV SpanSolenoid Relay STHWC Surge Tank High Water Control STHWL Surge Tank High Water Light STHWR Surge Tank High Water Relay STLWC Surge Tank Low Water Control STLWL Surge Tank Low Water Light

MNEMONIC DESCRIPTION

STLWR Surge Tank Low Water Relay

(T.C.) Timed Closed (T.O.) Timed Open TB Terminal Block T/C Thermocouple TC Time Clock TCR Time Clock Relay TD Time Delay TDAS Time Delay Auxiliary Switch TFWR Transistorized Feedwater Relay TPL Transfer Pump Light TPM Transfer Pump Motor TPMCB Transfer Pump Motor Circuit Breaker TPMF Transfer Pump Motor Fuses TPMS Transfer Pump Motor Starter TPS Transfer Pump Switch

UVFD Ultra-Violet Flame Detector

V Voltmeter VDR Voltage Differential Relay

W White (Color of Pilot Light) WC Water Column WCBDS Water Column Blow Down Switch WF Water Feeder WFNL Water Flow Normal Light WLC Water Level Control WO Denotes Waste Oil Equipment (Prefix) WTS Water Temperature Sensor

Y Yellow (Color of Pilot Light)

Figure 4-1: Electrical Nomenclature (Continued)

4-8 750-177

CHAPTER 5

Adjustment Procedures

A. General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

B. Linkage - Modulating Motor & Air Damper . . . . . .5-1

C. Modulating Motor . . . . . . . . . . . . . . . . . . . . . . . . . .5-2

D. Modulating Motor Switches -

Low Fire and High Fire . . . . . . . . . . . . . . . . . . . . . .5-2

E. Burner Operating Controls - General. . . . . . . . . . . .5-2

F. Modulating Pressure Control (Steam) . . . . . . . . . . .5-5

G. Operating Limit Pressure Control (Steam) . . . . . . .5-5

H. High Limit Pressure Control (Steam). . . . . . . . . . .5-5

I. Modulating Temperature Control (Hot Water). . . . .5-5

J. Operating Limit Temperature Control (Hot Water) .5-5

K. High Limit Temperature Control (Hot Water) . . . .5-5

Note: If the boiler is not equipped with a ProFire burner. Please refer to the specific Operation and Maintenance manual for the burner supplied.

A. GENERAL

Each Cleaver-Brooks boiler is tested for correct operation before shipment from the factory. However, variable conditions such as burning characteristics of the fuel and operating load conditions may require further adjustment after installation to assure maximum operating efficiency and economy.

A combustion efficiency analysis made during the initial start-up will help to determine what additional adjustments are required in a particular installation.

Prior to placing the boiler into service, a complete inspection should be made of all controls, connecting piping, wiring, and all fastenings such as nuts, bolts and setscrews to be sure that no damage has occurred, or that adjustments have not changed during shipment and installation.

The adjustment procedures in Chapter 6 apply to standard components furnished on steam or hot water boilers fired with gas and/or the various grades of oil.

L. Low Water Cutoff Devices . . . . . . . . . . . . . . . . . . . 5-6

M. Combustion Air Proving Switch . . . . . . . . . . . . . . 5-6

N. Gas Pilot Flame Adjustment . . . . . . . . . . . . . . . . . . 5-6

O. Gas Pressure and Flow Information . . . . . . . . . . . . 5-6

P. Gas Fuel Combustion Adjustment . . . . . . . . . . . . . . 5-7

Q. Low Gas Pressure Switch . . . . . . . . . . . . . . . . . . . . 5-8

R. High Gas Pressure Switch. . . . . . . . . . . . . . . . . . . . 5-8

S. Fuel Oil Pressure and Temperature - General . . . . . 5-8

T. Fuel Oil Combustion Adjustment . . . . . . . . . . . . . . 5-9

U. Low Oil Pressure Switch . . . . . . . . . . . . . . . . . . . 5-10

B. LINKAGE - MODULATING MOTOR

AND AIR DAMPER

The linkage consists of various arms, connecting rods, and swivel ball joints that transmit motion from the modulating motor to the metering valve, to the air damper, and to the gas butterfly valve, if used.

When properly adjusted, a coordinated movement of the damper and metering valves within the limits of the modulating motor travel is attained to provide proper fuel-air ratios through the firing range.

In linkage adjustments there are several important factors that must serve as guides.

1. The modulating motor must be able to complete its full

travel range.

CAUTION

DANGER

Do not restrict the full travel of the mod ulating motor. Failure to follow these instructions could result in equipment damage.

750-177 5-1

Chapter 5 Adjustment Procedures

2. Initial adjustment should be made with the motor in full closed position, that is with the shaft on the power end of the motor in its most counterclockwise position.

3. The closer the linkage rod connector is to the drive shaft, the less the arm will travel; the closer the connector is to the driven shaft, the farther that arm will travel.

. Prior to initially firing a boiler it is advisable to check for free movement of the linkage. The damper motor must be allowed to complete its full stroke and the damper must move freely from low to high fire position.

C. MODULATING MOTOR

The modulating motor has a 90° shaft rotation. The motor manufacturer also provides a 160° stroke model for other applications. If a replacement is obtained from someone other than a Cleaver-Brooks Service or Parts representative, it may have an incorrect stroke. To prevent damage, verify the 90° stroke prior to installing a replacement.

The stroke may be determined by powering the motor and connecting terminals R-B to actually determine the stroke as motor drives to an open position.

D. MODULATING MOTOR SWITCHES

- LOW FIRE AND HIGH FIRE

The modulating motor contains either one or two internal switches depending upon application. The microswitches are actuated by adjustable cams attached to the motor shaft.

Factory replacement motors have the cams preset. The low fire start switch is set to make the red and yellow leads at approximately 8° on motor closing. The high fire purge air proving switch (located in the modulating motor) is set to make red and blue tracer leads at approximately 60° the on motor opening. Normally the settings are left as is, but job conditions may require readjustment. If the cams require adjustment or resetting, follow the instructions in the manufacturer’s technical manual.

E. BURNER OPERATING CONTROLS

- GENERAL

Note: Adjustments to the boiler operating controls should be made by an authorized Cleaver-Brooks Service Technician. Refer to the appropriate boiler Operation and Maintenance manual for specific information on boiler startup and operation.

The standard boiler operating control package consists of three separate controls, the High Limit Control Limit Control and the Modulating control.

The High Limit Control steam pressure. It is used as a safety limit to turn the burner off in the event the operating limit control fails. The high limit control should be set sufficiently above the operating limit control to avoid nuisance shutdowns.

The Operating Limit Control and automatically turns the burner on to initiate the start-up sequence when required and turns the burner off to initiate the shutdown sequence when the demand is satisfied. The control must be set to initiate startup only at the low fire position.

The Modulating Control temperature or steam pressure and signals the modulating motor to control the flow of fuel and air to the burner. With either steam or hot water boilers, the modulating control must be set to ensure the burner is at its minimum low fire position before the operating limit control either starts or stops the burner.

When adjusting or setting controls, first be sure all control devices are securely mounted and level. With the temperature sensing control, make sure the sensing bulb is properly bottomed in its well and is secured against movement. Be sure the connecting tubing is not kinked.

The dial settings are generally accurate; although it is not unusual to have a slight variation between a scale setting and an actual pressure gauge or thermometer reading. Always adjust control setting to agree with pressure gauge or thermometer readings. Accurate instrument readings are required. When necessary use auxiliary test equipment to set controls.

senses the hot water temperature or

senses temperature or pressure

senses changes in the hot water

, Operating

5-2 750-177

Burner controls correctly set to match load demands will provide operational advantages and achieve the following desirable objectives:

• The burner will be operating in low fire position prior to shut down.

• The burner will operate at low fire for a brief period on each start during normal operation.

• Eliminates frequent burner on-off cycling.

Adjustment Procedures Chapter 5

Separate and independent controls affect modulated firing and burner on-off cycling. Figure 5-3 depicts a typical setting relationship of the operating limit control and the high limit control.

The burner will be “on” whenever the pressure or temperature

is less than point B and “off” whenever pressure or temperature is greater than point A. The distance between points A and B represents the “on-off” differential of the

operating limit control

In normal operation, the burner will shut down whenever the

pressure or temperature rises above setting A. At that point

the switch in the operating limit control

pressure or temperature drops back to B, the operating limit

control closes and the burner will restart. The modulating control will signal the modulating motor to be in a low fire position. If the load demands exceed the low fire input potential, the modulating control proportionately as pressure or temperature falls toward point

D. The modulating motor will stop at any intermediate point between C and D whenever the fuel input balances the load

requirement.

As the load requirement changes, the firing rate will change

accordingly. Thus it is referred to as modulated firing.

will increase the firing rate

, modulating control

will open. As the

Figure 5-1: Steam Controls

Point D represents the maximum firing rate of the burner, or

highfire. In the event pressure or temperature drops while the burner is firing at highfire, it indicates that the load exceeds the capacity of the boiler.

The firing graph (Figure 5-3) shows that point B and point C

do not coincide. Extreme load conditions could require the points be closely matched.

When set as shown, with a time lag between B and C, the

burner will be in a low fire position upon a restart and will fire at that rate for a short period of time before falling pressure or temperature requires an increase in the firing rate.

CAUTION

DANGER

Excessive cycling increases the potential and severity of internal condensation. OnOff cycling should be limited to eight (8) cycles or less per hour to keep the blower motor from overheating and excessive wear on the switch gear and pilot. Failure to follow these instructions could result in damage and premature failure of the equipment.

If points B and C overlap when restart occurs, the burner would drive to a higher firing position immediately after the main flame was proven.

Figure 5-2: Hot Water Operating Controls

Note: It is not recommended that the boiler controls be set so as to overlap the

750-177 5-3

Chapter 5 Adjustment Procedures

100%

Firing Rate

Minimum Input

(Low Fire)

Burner Off

Increasing

Modulation Control Response

Modulated Firing

Range

Operating Limit Control Response

Falling Temp. or Pressure

“ON - OFF”

Differential

Rising Temp. or Pressure

(Burner ON)

Boiler Temp.or Press

(Burner OFF)

High Limit Control Safety Shutdown

(Burner OFF)

Increasing

Figure 5-3: Firing Graph

modulating control range and operating control range.

When firing a cold boiler, it is recommended that the burner be kept at low fire, under manual flame control, until normal operating pressure or temperature is reached. If the burner is not under manual control on a cold start, it will immediately move toward high fire as soon as the program control releases the circuit that holds the burner in low fire. The modulating control will be calling for high fire and the burner will move to that position as rapidly as the damper motor can complete its travel.

Note: Rapid heat input can subject the pressure vessel metal and refractory to undesirable conditions.

Do not operate the boiler in excess of 90% of the safety valve relief setting. The closer the operating pressure is to the safety valve relief pressure, the greater the possibility of valve leakage. Continued leakage, however slight, will cause erosion and necessitate early safety valve replacement. The control settings on a hot water boiler must be within the temperature limits of the boiler.

Ideally, the boiler operating controls should be set under actual load conditions. Especially under new construction conditions, the boiler is initially started and set to operate under less than full load requirements. As soon as possible

ratios have been set, make the required adjustments to the controls to bring the boiler pressure or temperature up to meet the load requirements.

To properly set the modulating control

, carefully adjust it under load conditions, until the load is maintained with the burner firing at a steady rate. The firing rate at that point may be full high fire or slightly less, depending upon the relationship of the boiler size to the load.

When the modulating control

is set and the burner is in full high fire, the scale setting of the modulating pressure control on a steam boiler will indicate the low point of the modulating range. The scale setting of the modulating temperature control on a hot water boiler will have a reading that indicates the midpoint of the modulating range.

The operating limit

control should now be adjusted and the differential established. In an installation that does not require a very close control of steam pressure or water temperature the adjustable differential (Figure 5-3 A to B) should be set as wide as conditions permit, since a wide setting will provide less frequent burner cycling.

The high limit control burner off in the event the operating limit control

provides a safety factor to shut the

should fail. The setting of the control should be sufficiently above the operating limit control

to avoid nuisance shutdowns. The

setting, however, must be within the limits of the safety valve

thereafter, the controls should be reset to provide maximum utilization of the modulating firing system. To accomplish maximum utilization, and assuming that air/fuel combustion

5-4 750-177

6-4

Adjustment Procedures Chapter 5

settings and should not exceed 90% of the valve setting. The control requires manual resetting after it shuts off the burner.

In the setting of the controls, consideration must be given to the time required for a burner restart. Each start, requires a prepurge period, plus the fixed time required for proving the pilot and main flame. In addition, approximately one-half minute is required for the damper motor to travel from low to high fire. The time lag may allow pressure or temperature to drop below desirable limits.

F. MODULATING PRESSURE

CONTROL (Steam)

Turn the adjusting screw until the indicator is opposite the low point of the desired modulating range. Modulated firing will range between the low point and a higher point equal to the modulating range of the particular control. In 0-15 psi controls the range is 1/2 psi.

CAUTION

DANGER

To prevent burner shutdown at other than low-fire setting, adjust the modulating pressure control to modulate to low fire BEFORE the operating limit pressure control shuts off the burner. Failure to follow these instructions could result in damage to the equipment

G. OPERATING LIMIT PRESSURE

CONTROL (Steam)

Set the “cut-out” (burner-off) pressure on the main scale using the large adjusting screw. Set the differential on the short scale by turning the small adjusting screw until the indicator points to the desired difference between cut-out and cut-in pressures. The “cut-in” (burner-on) pressure is the cutout pressure MINUS the differential. The cut-out pressure should not exceed 90% of the safety valve setting.

H. HIGH LIMIT PRESSURE

CONTROL (Steam)

Set “cut-out” (burner off) pressure on the main scale using the adjusting screw. The control will break a circuit when pressure reaches this point. The setting should be sufficiently above the operating limit pressure control to avoid shutdowns, and preferably not exceed 90% of safety valve setting. The control requires manual resetting after tripping

on a pressure increase. To reset, allow pressure to return to normal and then press the reset button.

I. MODULATING TEMPERATURE

CONTROL (Hot Water)

Turn the knob on the front of the case until the pointer indicates the desired setpoint temperature. The desired set point is the center point of a proportional range. The control has a 3 to 30° differential and may be adjusted to vary the temperature range within which modulating action is desired. With the cover off, turn the adjustment wheel until pointer indicates desired range.

CAUTION

DANGER

To prevent burner shutdown at other than low-fire setting adjust modulating temperature control to modulate low fire BEFORE operating limit temperature control shuts off burner. Failu re to follow these instructions could result in damage to the equipment.

J. OPERATING LIMIT

TEM PE R ATU RE CO NT R OL

(Hot Water)

Set “cut-out” (burner off) temperature on the scale by inserting a screwdriver through the cover opening to engage the slotted head adjusting screw. The “cut-in” (burner on) temperature is the cut-out temperature MINUS the differential. The differential is adjusted from 5 to 30° F.

K. HIGH LIMIT TEMPERATURE

CONTROL (Hot Water)

Set the “cut-out” (burner off) temperature on scale using the adjusting screw. The control will break the circuit and lock out on a rise in water temperature above the setting. The setting should be sufficiently above the operating limit temperature to avoid unnecessary shutdowns. The control requires manual resetting after tripping on a temperature increase. To reset, allow the water temperature to drop below the cut-out setting less differential, and then press the manual reset button.

750-177 5-5

Chapter 5 Adjustment Procedures

N. GAS PILOT FLAME ADJUSTMENT

The size of the gas pilot flame is regulated by adjusting the gas flow through the pilot gas regulator. The flame must be sufficient to ignite the main flame and to be seen by the flame

123

detector. But an extremely large flame is not required. An overly rich flame can cause sooting or carbon buildup on the igniting electrode. Too small a flame can cause ignition problems.

Although it is possible to visibly adjust the size of the pilot flame, it is preferable to obtain a microamp or voltage reading of the flame signal.

The correct voltage or microamp readings can be found in the information supplied with the flame safeguard system.

1. HIGH LIMIT TEMPERATURE CONTROL

OPERATING LIMIT TEMPERATURE CONTROL

3. MODULATING TEMPERATURE CONTROL

Figure 5-4: Steam Operating Controls

L. LOW WATER CUTOFF DEVICES

(Steam and Hot Water)

No adjustment is required since LWCO controls are preset by the original manufacturer. However, if the water level is not maintained, inspect the devices immediately and replace as required.

M. COMBUSTION AIR PROVING

SWITCH

Air pressure against the diaphragm actuates the switch which, when made, completes a circuit to prove the presence of combustion air. Since the pressure of the combustion air is at its minimum value when the damper is full closed, the switch should be adjusted under that situation. It should be set slightly below the minimum pressure, but not too close to that point to cause nuisance shutdowns.

The run/test switch on the program relay should be set to TEST. Turn the burner switch on. The blower will start (provided that all limit circuits are completed) and the programmer will remain in the low-fire (damper closed) portion of the prepurge.

Slowly turn down the air switch adjusting screw until it breaks the circuit. Here the programmer will lock out and must be manually reset before it can be restarted. Add a half turn or so to the adjusting screw to remake its circuit.

Recycle the program relay to be sure that normal operation is obtained. Return the test switch to the RUN position.

The program relay used may be of the type that provides message information that includes a constant flame signal of dc voltage. In this case a separate dc voltmeter is not required.

O. GAS PRESSURE AND FLOW

INFORMATION

Because of variables in both the properties of gas and the supply system, it will be necessary to regulate the pressure of the gas to a level that produces a steady, dependable flame that yields highest combustion efficiency at rated performance yet prevents overfiring. Once the optimum pressure has been established, it should be recorded and periodic checks made to verify that the regulator is holding the pressure at this level. Occasional modification in fuel composition or pressure by the supplier may, at times, require readjustment to return the burner to peak efficiency.

Pressure

The gas supplied must provide not only the quantity of gas demanded by the unit, but must also be at a pressure high enough to overcome the pressure-loss due to the frictional resistance imposed by the burner system and the control valves.

The pressure required at the entrance to the burner gas train for rated boiler output is termed “inlet pressure.” The gas pressure regulator must be adjusted to achieve the pressure to assure full input.

The inlet pressure requirement varies with boiler size, and types of gas train. Refer to Table 6-3 for pressure requirements.

The pressures listed are based on 1000 Btu/cu-ft natural gas at elevations up to 700 feet above sea level.

The volume of gas flow is measured in terms of cubic feet and is determined by a meter reading. The gas flow rate required for maximum boiler output depends on the heating value (Btu/cu-ft) of the gas supplied (Table 6-1).

5-6 750-177

Adjustment Procedures Chapter 5

Pressure Correction

The flow rate outlined in Section P is based on a “base” pressure, which is usually atmospheric or 14.7 psia.

Meters generally measure gas in cubic feet at “line” or supply pressure. The pressure at which each cubic foot is measured and the correction factor for the pressure must be known in order to convert the quantity indicated by the meter into the quantity which would be measured at “base” pressure.

To express the volume obtained from an actual meter reading into cubic feet at base pressure, it is necessary to multiply the meter index reading by the proper pressure factor obtained from Table 6-2

As An Example:

Assume that a 500Flextube boiler is rated for 5MMBtu/hr input is installed and equipped with a standard gas train; and that 1,000 Btu natural gas is available with an incoming gas pressure of 3 psig. The flow requirements can be determined as follows:

Flow

Since the gas flow rate is based on standard conditions of flow, correction must be made for the supply pressure through the meter of 3 psig. Determine the flow rate by dividing the Btu content of the gas into the burner input (Table 6-1) and “correct” this answer by applying the correction factor for 3 psig (Table 6-2).

Btu/hr Input

= CFH (Cubic feet/hour) Required

Btu/cu-ft

5,000,000

= 5,000 CFH (At 14.7 Ib-atmospheric base

1,000 pressure)

THEN

= 4237 CFH

5,000

1.18

This is the CFH (at line pressure) that must pass through the meter so that the equivalent full input requirement of 5,000 CFH (at base pressure) will be delivered.

Checking Gas Flow

Your gas supplier can generally furnish a gas meter flow chart from which gas flow can be determined. After a short observation period, the information aids in adjusting the regulator to increase or decrease flow as required to obtain the rating.

Final adjustment of the gas fuel is carried out by means of Fine tuning the linkage adjustments, while performing a combustion efficiency analysis. See Section O for details.

Note: The information given in this section is for all practical purposes sufficient to set and adjust controls for gas input. Your gas supplier can, if necessary, furnish exact correction factors that take into consideration Btu content, exact base pressure, specific gravity, temperature, etc., of the gas used.

P. GAS FUEL COMBUSTION

ADJUSTMENT

After operating for a sufficient period of time to assure a warm boiler, adjustments should be made to obtain efficient combustion.

Burner efficiency is measured by the amount or percentage of

present in the flue gas. O2 readings determine the total

amount or excess air in the combustion process, above the point of stoichiometric combustion or perfect combustion. Stoichiometric combustion is a term used to describe a condition when there is the exact amount, molecule for molecule, of air for the fuel attempting to be burned. This can be accomplished under laboratory conditions, however it’s not practical to attempt to meet this condition in a boiler. Stoichiometric combustion however, is the reference point used when setting fuel/air ratios in a boiler.

There must always be excess air in the combustion process to account for changes in boiler room temperature and atmospheric conditions, and to ensure the combustion is on the proper side of the combustion curve.

Proper setting of the air/fuel ratios at all rates of firing must be established by the use of a combustion or flue gas analyzer. The appearance or color of the gas flame is not an indication of its efficiency, because an efficient gas flame will vary from transparent blue to translucent yellow.

Most flue gas analyzers in use today measure the content, by percentage of oxygen (O by percent or parts per million (ppm). Carbon dioxide (CO is not normally measured with todays flue gas analyzers, but may be displayed via a calculation.

The O

levels through the entire firing range of the burner,

low fire to high fire should be tested. Cleaver-Brooks recommendations on turndown should also be followed and the turndown range of the burner should not be exceeded.

It’s important to understand what the readings shown on an instrument refer to when setting combustion in a boiler. To assist with this understanding Figure 5-5 shows the relationship between O of combustion for a typical flue gas analysis (natural gas).

One of the products of combustion is CO This is shown in percentage.

Another product of combustion is CO (carbon monoxide) and is shown in both percentage and parts per million (ppm). The

) and carbon monoxide (CO) either

levels (excess air) and the products

(Carbon Dioxide).

)

750-177 5-7

Chapter 5 Adjustment Procedures

maximum CO level standardly allowed is less than 400 ppm. However, this may change subject to local regulations.

The percent O excess air, I.E. 3% O

is approximately 20% excess air. The exact percentage

4% O

recorded on an instrument equates to percent

is approximately 15% excess air and

of excess air is a mathematical calculation based on an ultimate fuel analysis of the fuel being fired.

It is generally recommended that O

readings of between 3%

to 5% be attained with less than 400 ppm CO, at high fire.

Using information from Section O of Chapter 6, determine the standard conditions of gas pressure and flow for the size boiler and the gas train on it. Calculate the actual pressure and flow through the use of correction factors that compensate for incoming gas pressure and altitude.

Basically, gas adjustments are made with a gas pressure regulator, which controls the pressure and with the butterfly

gas valve which directly controls the rate of flow.

The low fire setting should be regarded as tentative until the proper gas pressure for high fire operation is established.

To reach the high fire rate, turn the manual flame control switch toward “OPEN” in minor increments while monitoring combustion for overly rich or lean conditions.

At high fire, the gas butterfly valve should be open as wide as indicated by the slot on the end of the shaft.

Determine the actual gas flow from a meter reading. (See Section O of Chapter 6.) With the butterfly valve open and with regulated gas pressure set at the calculated pressure, the actual flow rate should be close to the required input. If corrections are necessary, increase or decrease the gas pressure by adjusting the gas pressure regulator, following the manufacturer's directions for regulator adjustment.

When proper gas flow is obtained, take a flue gas reading.

should be between 3% and 5% at high fire.

The O

If the fuel input is correct, but the O

values do not fall within

this range, the air damper settings may need to be adjusted. Adjustment of the air damper linkage is described in Section B of Chapter 6.

With the high-fire air/fuel ratio established, the gas pressure regulator needs no further adjusting.

After being certain that the air control damper and its linkage are correctly adjusted to provide the proper amount of secondary air, and after adjusting the gas pressure regulator, final adjustment can be made, if necessary obtain a constant air/fuel ratio throughout the entire firing range.

If the air damper needs to be adjusted in order to provide the correct low fire air/fuel ratio, combustion must be rechecked at higher firing rates and adjusted as required.

Q. LOW GAS PRESSURE SWITCH

Adjust the scale setting to slightly below the normal burning pressure. The control circuit will be broken when pressure falls below this point. Since gas line distribution pressure may decrease under some conditions, shutdowns may result if the setting is too close to normal. However, regulations require that the setting may not be less than 50% of the rated pressure downstream of the regulator.

Manual resetting is necessary after a pressure drop. Press the reset lever after pressure is restored. Be sure that the mercury switch equipped control is level.

R. HIGH GAS PRESSURE SWITCH

Adjust the scale setting to slightly above the normal burning pressure. The control circuit will be broken when pressure exceeds the normal operating pressure. Unnecessary shutdowns may result if the setting is too close to normal; however, regulations require that the setting may not be greater than 150% of rated pressure.

Manual resetting is necessary after a pressure rise. Press the reset lever after pressure falls. Be sure that the mercury switch equipped control is level.

S. FUEL OIL PRESSURE AND

TEMPERATURE - GENERAL

Variations in burning characteristics of the fuel oil may occasionally require adjustments to assure highest combustion efficiency. The handling and burning characteristics may vary from one delivery of oil to another. Therefore, it is recommended that the oil system be inspected from time to time to verify that pressures and viscosity are at the proper operating levels.

Because of variation in oils, including chemical content, source, blends, and viscosity characteristics, the temperatures and pressures listed in Chapter 5, and mentioned in the adjusting of the controls in the following paragraphs, will vary and thus may be regarded as tentative and to be changed to provide best firing conditions. Review of the applicable maintenance instructions given in Chapter 8 will aid in maintaining an efficient fuel system.

Input of combustion air is ordinarily fixed at any given point in the modulating cycle, the flue gas reading is determined by varying the input of gas fuel at that setting. Standard Burner Low Fire Adjustment

The fuel input should be adjusted using the linkage to approximately 33% of that at high fire. At low fire the O gas reading should be between 3-5%.

5-8 750-177

flue

Adjustment Procedures Chapter 5

MODEL NO. 150 200 250 300 350 400 450 500 550 600 700 800 900 1000 1100 1200

Fuel Consumption Gas (cfh)A 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 7000 8000 9000 10000 11000 12000 A. Natural Gas @ 1000 Btu/cu-ft.

Table 6-1: Fuel Consumption (Natural Gas)

REGULATOR INLET

PRESSURE (PSIG)

11.05

21.11

31.18

41.25

51.32

61.39

71.45

81.53

91.59 10 1.66 11 1.72 12 1.81 13 1.86 14 1.93 15 2.00

PRESSURE FACTOR

Table 6-2: Pressure Correction Factors

MODEL NO.

FLX-1000 2.5 31.6 31.6 PFVG-100

FLX-1100 2.5 37.3 37.3 PFVG-110

FLX-1200 2.5 38.2 38.2 PFVG-120

Notes:

1. Table is based on 1,000 Btu/cu.ft natural gas and elevation to 1000 feet.

2. Minimum gas pressure also applies to 200 fuel series.

3. As an option, the standard gas train can be replaced with an oversized design to reduce inlet gas pressure requirements.

4. Use this column for all U.S. Installations.

5. Use this column for all Canadian Installations.

STD GAS

TRAIN SIZE

(IN.) Note 3

MIN. GAS

PRESSURE

(IN.W.C.)

Note 4

MIN. GAS

PRESSURE

(IN.W.C.)

Note 5

BURNER

MODEL

Table 6-3: Minimum Required Gas Pressures

T. FUEL OIL COMBUSTION

ADJUSTMENT

condition or color, although they may be used in making After operating for a sufficient period of time to assure a warm boiler, adjustments should be made to obtain efficient combustion.

Burner efficiency is measured by the amount or percentage of

present in the flue gas. O2 readings determine the total

amount or excess air in the combustion process, above the point of stoichiometric combustion or perfect combustion. Stoichiometric combustion however, is the reference point used when setting fuel/air ratios in a boiler.

There must always be excess air in the combustion process to account for changes in boiler room conditions and to ensure the combustion is on the proper side of the combustion curve .

Proper setting of the air/fuel ratios at all rates of firing must be established by the use of a combustion gas analyzer. Efficient combustion cannot be solely judged by flame

750-177 5-9

approximate settings. Combustion settings should be done so

that there is a bright sharp flame with no visible haze.

Most flue gas analyzers in use today measure the content, by

percentage, of oxygen (O

Carbon dioxide (CO

) is not normally measured with modern

) and in some cases, smoke.

gas analyzers, but may be displayed as a calculation.

levels through the entire firing range of the burner,

The O

low fire to high fire should be tested. Cleaver-Brooks

recommendations on turndown should also be followed and

the turndown range of the burner should not be exceeded.

It is required to set the burner to operate with a reasonable

amount of excess air to compensate for minor variations in

the pressure, temperature, or burning properties of oil. Fifteen

to 20% excess air is considered reasonable. This would result

in an O

reading of 3% to 4%, at high fire.

Chapter 5 Adjustment Procedures

FIRST VISIBLE TRACE OF STACK HAZE

IN FLUE GAS

PER CENT CO

890

PER CENT O2 IN FLUE GAS PER CENT CO

5060

PER CENT EXCESS AIR

3040

1020

Figure 5-5: Flue Gas Analysis Chart for Natural Gas

Final adjustment to fuel input must be made to produce a minimum of smoke. A maximum smoke spot density of a No. 2 for light oil, as measured in conformance to ASTMD 215663T.

Through the use of the manual flame control, slowly bring the unit to high fire by stages while monitoring combustion for overly rich or lean conditions. At the high fire position, the air damper should be fully opened and the air and oil pressure readings should be on the order of the readings given in Chapter 5.

U. LOW OIL PRESSURE SWITCH

The L.O.P.S. prevents burner ignition, or stops its operation, when the oil pressure is below the setpoint. Adjust the control by turning the screw on top of control case to an indicated pressure 10 psi below the established primary oil pressure setting indicated on the oil supply pressure gauge. The switch will remain in a closed position as long as the oil pressure exceeds this setting. The control normally used automatically resets when pressure is restored after a drop.

1122334455 6

1/10 of 1% CO = 1,000 PPM

Pressure Switches

Figure 5-6: Gas Train With High and Low Pressure

Switches

5-10 750-177

CHAPTER 6

Troubleshooting

WARNING

DANGER

Troubleshooting should be performed only by personnel who are familiar with the equipment and who have read and understand the contents of this manual. Failure to follow these instructions could result in serious personal injury or death.

WARNING

DANGER

Disconnect and lock out the main power supply in order to avoid the hazard of electrical shock.Failure to follow these instructions could result in serious personal injury or death.

possibly eliminate overlooking an obvious condition, often one that is relatively simple to correct.

If an obvious condition is not apparent, check the continuity of the circuits with a voltmeter or test lamp. Each circuit can be checked and the fault isolated and corrected. Most circuitry checking can be done between appropriate terminals on the terminal boards in the control cabinet or the entrance box. Refer to the schematic wiring diagram for terminal identification.

Chapter 7 assumes that the unit has been properly installed and adjusted, and that it has been running for some time. It is further assumed that the operator has become thoroughly familiar with both burner and manual by this time. The points under each heading are set down briefly as possible causes, suggestions or clues to simplify locating the source of trouble. Methods of correcting the trouble, once it has been identified, may be found elsewhere in this manual.

If the burner will not start or operate properly, the trouble shooting chapter should be referred to for assistance in pinpointing problems that may not be readily apparent.

The program relay has the capability to self-diagnose and to display a code or message that indicates the failure condition. Refer to the control bulletin for specifics and suggested remedies.

Familiarity with the programmer and other controls in the system may be obtained by studying the contents of this manual. Knowledge of the system and its controls will make trouble shooting much easier. Costly down-time or delays can be prevented by systematic checks of actual operation against the normal sequence to determine the stage at which performance deviates from normal. Following a routine may

750-177 6-1

Chapter 6 Troubleshooting

Problem Solution

BURNER DOES NOT START 1. No voltage at program relay power input terminals.

A.Main disconnect switch open.

B. Blown control circuit fuse.

C. Loose or broken electrical connection.

2. Program relay safety switch requires resetting.

3. Limit circuit not completed—no voltage at end of limit circuit program relay terminal.

A.Pressure or temperature is above setting of operation control. (Load demand

light will not glow.)

B. Water below required level.

1). Low-water light (and alarm horn)should indicate this condition.

2). Check manual reset button, if provided, on low-water control.

C. Fuel pressure must be within settings of low pressure and high pressure

switches.

4. Fuel valve interlock circuit not completed.

A.Fuel valve auxiliary switch not enclosed.

NO IGNITION 1. Lack of spark.

A.Electrode grounded or porcelain cracked.

B. Improper electrode setting.

C. Loose terminal on ignition cable; cable shorted.

D.Inoperative ignition transformer.

E. Insufficient or no voltage at pilot ignition circuit terminal.

2. Spark but no flame.

A.Lack of fuel - no gas pressure, closed valve, empty tank, broken line, etc.

B. Inoperative pilot solenoid.

C. Insufficient or no voltage at pilot ignition circuit terminal.

D.Too much air.

3. Low fire switch open in low fire proving circuit.

A.Damper motor not closed, slipped cam, defective switch.

B. Damper jammed or linkage binding.

4. Running interlock circuit not completed.

6-2 750-177

A.Combustion air proving switch defective or not properly set.

B. Motor starter interlock contact not closed.

5. Flame detector defective, sight tube obstructed, or lens dirty.

Troubleshooting Chapter 6

Problem Solution

PILOT FLAME, BUT NO MAIN FLAME

1. Insufficient pilot flame.

2. Gas Fired Unit.

A.Manual gas cock closed.

B. Main gas valve inoperative.

C. Gas pressure regulator inoperative.

3. Oil fired unit.

A.Oil supply cut off by obstruction, closed valve, or loss of suction.

B. Supply pump inoperative.

C. No fuel.

D.Main oil valve inoperative.

E. Check oil nozzle, gun and lines.

4. Flame detector defective, sight tube obstructed or lens dirty.

5. Insufficient or no voltage at main fuel valve circuit terminal.

BURNER STAYS IN LOW FIRE

SHUTDOWN OCCURS DURING FIRING

1. Pressure or temperature above modulating control setting.

2. Manual-automatic switch in wrong position.

3. Inoperative modulating motor.

4. Defective modulating control.

5. Binding or loose linkage, setscrews, etc.

1. Loss or stoppage of fuel supply.

2. Defective fuel valve; loose electrical connection.

3. Flame detector weak or defective.

4. Lens dirty or sight tube obstructed.

5. If the programmer lockout switch has not tripped, check the limit circuit for an opened safety control.

6. If the programmer lockout switch has tripped:

A.Check fuel lines and valves.

B. Check flame detector.

C. Check for open circuit in running interlock circuit.

D.The flame failure light is energized by ignition failure, main flame failure,

inadequate flame signal, or open control in the running interlock circuit.

750-177 6-3

Chapter 6 Troubleshooting

Problem Solution

SHUTDOWN OCCURS DURING FIRING

7. Improper air/fuel ratio (lean fire).

A.Slipping linkage.

B. Damper stuck open.

C. Fluctuating fuel supply.

1). Temporary obstruction in fuel line.

2). Temporary drop in gas pressure.

8. Interlock device inoperative or defective.

MODULATING MOTOR

1. Manual-automatic switch in wrong position.

DOES NOT OPERATE

2. Linkage loose or jammed.

3. Motor does not drive to open or close during pre-purge or close on burner shutdown.

A.Motor defective.

B. Loose electrical connection.

C. Damper motor transformer defective.

4. Motor does not operate on demand.

A.Manual/automatic switch in wrong position.

B. Modulating control improperly set or inoperative.

C. Motor defective.

D.Loose electrical connection.

E. Damper motor transformer defective.

Excessive Rust On Tubes 1. Condensation of the flue gases on cool tubes is causing rust.

A Change system so return temperatures are above 120 assure water temperatures entering boiler are above 120

2. Open stack or condensate running down stack or breeching.

°F or install blend pump to

°F.

Water On Base 1. A cold environment and/or intermittent firing may allow inner casing to heat up above

6-4 750-177

A. Stack should be offset. Insulate and drain stack.

3. Frequent cold starts.

A. Reset controls for less cycling.

the condensation temperature of the flue gasses.

A. Increase temperature of the cold boiler room if possible.

B. Verify insulation is in place between inner and outer casing and replace if missing.

C. Reset controls for less cycling to allow boiler to run for longer periods of time to heat inner casing above condensation temperature.

Troubleshooting Chapter 6

Problem Solution

2. Cold system startup.

A. Any time a boiler is started with a cold system, it will produce condensate until internal surface temperatures exceed 130

°F. Internal condensation will not be produced

once a boiler has warmed up. Condensate will dry up after a short time. Limit number of cold starts.

3. Cold return temperatures.

A. Return temperatures below 120 return temperatures above 120

°F. will continually produce condensation. Raise

°F.

4. Gasket leaks allow gases to escape and condence on relatively cool base.

A. Gasket may need to be replaced or inner casing not installer per instructions. Install inner casing and gasket per instructions outlined in Chapter 8, SectionD.

750-177 6-5

Chapter 6 Troubleshooting

6-6 750-177

CHAPTER 7

Inspection and Maintenance

A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

B. Periodic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

C. Fireside Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

D. Upper Pass Cleaning. . . . . . . . . . . . . . . . . . . . . . . . 7-2

E. Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

F. Oil Burner Maintenance . . . . . . . . . . . . . . . . . . . . . 7-6

G. Gas Burner Maintenance. . . . . . . . . . . . . . . . . . . . . 7-7

H. Refractory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

I. Casing Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

A. GENERAL

A well-planned maintenance program will help to avoid unnecessary downtime or costly repairs, promote safety, and aid boiler inspectors in performing required periodic inspections. An inspection schedule with a listing of procedures should be established. It is recommended that a boiler room log or record be maintained. Recording of daily, weekly, monthly, and yearly maintenance activities provides a valuable guide and aids in obtaining safe, economical and lengthy service from your Cleaver-Brooks equipment. It is important to realize that the frequency of inspection will depend on variable conditions such as load, fuel, system requirements, boiler environment, etc.

WARNING

DANGER

Shut off electrical power to the boiler when performing any service or maintenance work or work that requires removal of covers or component parts. Failure to heed this warning could result in electrical shock, serious personal injury or death.

Good housekeeping practices help maintain a professional appearing boiler room. Only trained and authorized personnel should be permitted to operate, adjust, or repair the boiler and related equipment. The boiler room should be kept free of all material and equipment not necessary to the operation of the boiler or heating system.

Even though the boiler has electrical and mechanical devices that make it automatic or semiautomatic in operation, the devices require systematic and periodic maintenance. Any “automatic” feature does not relieve the operator from responsibility. Automatic features do free the operator of

certain repetitive chores, thus providing more time to devote to upkeep and maintenance.

Alertness in recognizing an unusual noise, improper gauge reading, leaks, etc., can make the operator aware of a developing malfunction, permitting prompt corrective action that may prevent extensive repairs or unexpected downtime. Any leaks - fuel, water, steam combustion gases - should be investigated and repaired with all due consideration of the necessary safety precautions.

Preventive maintenance measures such as regularly checking the tightness of connections, locknuts, setscrews, packing glands, etc., should be included in regular maintenance activities.

WARNING

DANGER

Inspection and maintenance should be performed only by trained personnel who are familiar with the equipment. Failure to heed this warning could result in serious personal injury or death.

B. PERIODIC INSPECTION

Insurance regulations or local codes may require a periodic inspection of the pressure vessel by an authorized inspector. Inspections are usually scheduled for periods of normal boiler downtime such as during an off season. The major inspection can often be used to accomplish maintenance, replacement, or repair tasks that cannot easily be done at other times. This also serves as a good basis for establishing a schedule for annual, monthly, or other periodic maintenance programs.

While the inspection pertains primarily to the waterside and fireside surfaces of the pressure vessel, it provides the

750-177 7-1

Chapter 7 Inspection and Maintenance

operator with an excellent opportunity to perform a detailed check of all components of the boiler, including piping, valves, pumps, gaskets, refractory, etc. Complete cleaning, spot painting or repainting, and the replacement of expendable items, should be planned for and taken care of during this time. If possible, any major repairs or replacements that may be required should be taken care of during the boiler shutdown.

Replacement spare parts, if not on hand, should be ordered well in advance of a shutdown.

Note: Cleaver-Brooks genuine parts should be used to ensure proper operation and to avoid damage to the equipment.

Cleaver-Brooks boilers are designed, engineered and built to give long life and excellent service. Good operating practices and consistent maintenance and care will promote efficiency and economy of operation and contribute to many years of reliable performance from the equipment.

Cleaver-Brooks offers a Planned Maintenance Program that covers many of the items included on this chapter. For more information on the Planned Maintenance Program, contact your local Cleaver-Brooks authorized representative.

C. FIRESIDE CLEANING

Soot and other noncombustible deposits are effective insulators and, if allowed to accumulate on boiler heat exchanger surfaces, will reduce heat transfer to the water and increase fuel consumption. Soot and other deposits can absorb moisture and may attract moisture in the form of corrosive acids that will deteriorate fireside metal.

Inspection and cleanout should be performed at frequent intervals, depending upon the boiler's load, type and quality of fuel, internal boiler temperature, and combustion efficiency. Stack temperature can be used as a guide to determine cleanout intervals, since an accumulation of soot deposits will raise the stack temperature.

Access to the furnace for tube and refractory cleaning is provided through a hinged burner door at the front of the boiler. When opening the burner door, first shut off the electrical and fuel supplies and then disconnect all fuel lines at the burner watching to see that there is no interference with field installed piping, wiring, or other obstructions. A temporary platform must be placed inside the furnace in order to protect the bottom drum insulating refractory when working inside the furnace.

WARNING

DANGER

To avoid the hazard of electrical shock, which could cause serious personal injury or death, the use of a low voltage flashlight Is recommended when working Inside the boiler furnace area.

Tubes should be brushed with a wire brush to remove any soot or other accumulations. Refractory surfaces should be cleaned, if necessary, with a soft bristle brush. Loose material should be vacuumed from the bottom of the furnace.

D. UPPER PASS CLEANING

Upper pass access is gained through removal of the inner and outer side casing. To remove the outer casing panels, first disconnect and remove any electrical conduit, boxes and brackets attached to the side outer casing. Match mark the outer panels for repositioning. Remove screw (if installed) from frame above each outer panel. Starting with center panel, slide panel up, swing bottom of panel away from boiler and then slide down from the upper frame and set panel aside. After the center panel(s) are removed, the end panels can be slid (approximately 1") towards the center until they free from the corner frame and then removed in the same manner as the center panel(s). It there are only two outer panels (Models 150 through 350), then slide one end panel further into the corner frame to allow the other panel to slide free from the corner frame. If obstructions are present, such as the gas train, there may not be enough room to slide the panel out from under the upper frame. In this case, unscrew the upper frame from the roof and side frames and remove it also.

Match mark all inner casing panels for repositioning later. Inner casing panels must be removed in sequence starting from either end. Remove nuts, washers and clamp angles from the end and bottom of panels. Remove nuts, washers and bolt bars from vertical seams. Loosen nuts on top clamp angles but don't remove until panel is ready to be removed. Inner casing panels can not be removed by pulling panel straight out from boiler because of a 1" gasket retaining strip that overlaps behind the panels. Remove inner casing panels by sliding or angling panel away from remaining panels until the 1" retaining strip has cleared panel and then panel can be removed and set aside.

After removing the inner side casing, the pass cover plates (2nd pass only) must be removed. The cover plates are screwed together and are held in place by tabs inserted between the tubes. Remove the insulation by starting at one end and carefully rolling it up. The insulation blocks can now be removed from the pass opening. Keep the insulation blocks in order once they have been removed so they can be re-installed in the same position. Insulation is removed from the 4th pass in the same manner.

Now that the 2nd (left side) and 4th (right side) pass openings are exposed, cleaning can be done in the same way as the furnace area. Since the 3rd pass is only open on the ends, cleaning is done by pushing a wire brush mounted on a long handle, through from each end. Since the arc of movement is restricted, cleaning the 3rd pass must be done from both sides of the boiler. The fifth pass is cleaned from above the tubes. As in the furnace, loose material should be removed by vacuuming after brushing. The pressure vessel should be inspected for any signs of deterioration after cleaning.

7-2 750-177

Inspection and Maintenance Chapter 7

The flue outlet and stack should also be inspected annually and cleaned as necessary. Commercial firms are available to perform this work. The stack should also be inspected for damage and repaired as required.

Once everything has been cleaned and inspected the boiler can be put back together. Install insulation blocks in the 2nd and 4th pass openings in their previous positions. Spray adhesive on tubes above and below pass opening and install blanket insulation over opening. Install cover plates on 2nd pass (left) side only. If any insulation was removed from under the tubes at bottom of boiler it should be replaced at this time.

Prior to installing the inner casing, inspect studs on boiler and bolt bars for any thread damage. Any damaged threads should be cleaned and chased with a 3/8"-16 die. Apply a small amount of Cleaver-Brooks "Never-Seez" (p.n. 7971814 or 797-1816) on each stud.

Before the inner casing can be installed, the old gaskets must be removed from the panels and around the perimeter of the boiler and replaced with new ones. After removing the gaskets, the surfaces should be cleaned to allow the new gasket to seal properly. The gasket around the perimeter of the boiler should be one piece with the ends overlapping side by side somewhere along the upper (roof) surface. A small amount of silicone will be required to fill gaps and valleys where the gasket crosses. This includes the roof to end wall seams and the base angle to end wall gaps. It is important that the entire gap between the end wall and the base angle be completely sealed. The seal along the base of the end wall should also be checked and resealed if necessary. The gasket should be positioned to the inside of the studs with a 1/4" gap between the studs and the gasket.

Install gasket on side casing panels so it extends past the top and bottom by 1/4" or more and 1/16" to 1/8" out the back at the top and bottom of the panel. (See Figure 7-1). Starting from one end, set panel edge 1/8" to 1/4" from the studs on the end wall. Install the first lower clamp angle over the respective studs, install washers and start nuts. Any nuts that are difficult to install should be replaced. Place the upper clamp angle over the top studs and install washers and nuts but don't tighten. The end clamp can now be installed and nuts on the end clamp can be snugged up but not completely tightened. Before installing the next panel, apply a small amount of teflon paste to the area where the vertical gasket and the horizontal gaskets will overlap at the top and bottom. This will help ensure an air tight seal. Install the next panel in line being careful to slide the 1" gasket retaining strip behind the panel but under the insulation. Install the bottom and top clamp angles to hold panel in place, but don't tighten. Install the bolt strips, washers and nuts which clamp the panels together. Pull panels together evenly and tighten nuts to 250 to 300 in-lbs. Repeat until all panels are installed and securely bolted together. Now panels can be evenly pulled toward boiler with clamp angles. Tighten all nuts to 250 to 300 in-lbs.

The outer casing panels can now be installed starting with the end panels. Slide each end panel under the upper frame and push the bottom section into the boiler and allowing it to slide down to catch the bottom clamp angle. Then slide the end panels under the corner frames and install any remaining center panels.

The fireside should be thoroughly cleaned prior to any extended layup of the boiler. Depending upon circumstances, a protective coating may be required. See Chapter 3, Section H "Preparation for Extended Layup".

750-177 7-3

Figure 7-1 Gasket application to inner casing

Chapter 7 Inspection and Maintenance

E. CONTROLS

Relief Valves

The relief valve is a very important safety device and deserves attention accordingly. Proper removal, installation or handling of a relief valve is of primary importance. Exercise care when removing, installing or handling a relief valve to ensure proper operation, long service life, and to ensure that the valve functions as designed.

WARNING

DANGER

Improper removal, handling or installation of a relief valve may adversely affect the valve's operation, resulting in serious personal injury or death.

Observe the following precautions when removing, handling or installing relief valves.

• Use only flat jawed wrenches on the flats of the valve

• Do not use a pipe threaded into the outlet to turn a valve

• Apply only a moderate amount of pipe compound to male threads

• Avoid over tightening, which can distort valve seating surfaces

• Do not paint, oil or otherwise cover any interior or working parts of the valve. A relief valve does not require any lubrication or protective coating to work properly.

• Discharge piping must be properly arranged and supported so that its weight does not bear on the relief valve.

• Handle with care a valve that has been removed from the boiler. A dropped valve should be considered as damaged until it has been inspected and passed by the valve manufacturer's authorized representative.

accordance with Section IV of the ASME Boiler and Pressure Vessel Code.

Low Water Controls (Hot Water)

Most instances of major boiler damage result from operating with low water. Since low water cutoff devices are set by the original manufacturer, no attempt should be made to adjust these controls in order to alter the point of low water cutoff. If a low water cutoff should become erratic in operation, immediately replace it or contact your local Cleaver-Brooks authorized representative for assistance.

It is essential to verify proper operation of low water cutoff devices as frequently as possible. However, it is impractical to perform daily and monthly maintenance on some models of the low water cutoff devices on a hot water boiler. Hot water systems are fully closed. Daily or monthly maintenance on some models of the low water cutoff devices would involve draining the entire water content of the system and would require makeup and additional feedwater treatment that might not otherwise be necessary.

To verify the proper operation of float style low water cutoff devices, the system must be drained. Remove the operating mechanism from the bowl and check and clean the float ball, internal moving parts, and the bowl housing. Also, check the cross-connecting piping to make certain that it is clean and free of obstruction.

It is impractical to blowdown the low water cutoff devices on a hot water boiler, since the entire water content of the system would become involved. Many hot water systems are fully closed and any loss of water will require makeup and additional feedwater treatment that might not otherwise be necessary. Since the boiler and system arrangement usually make it impractical to perform daily and monthly maintenance of the low water cutoff devices, it is essential to remove the operating mechanism from the bowl annually or more frequently, if possible, to check and clean float bowl, internal moving parts, and the bowl housing. Also check the cross- connecting piping to make certain that it is clean and free of obstruction.

WARNING

DANGER

Only properly certified personnel such as the relief valve manufacturer's representative should adjust or repair the boiler relief valves. Failure to heed this warning could result in serious personal injury or death.

Relief valves should be operated only often enough to assure that they are in good working order. Follow the recommendations of your boiler inspector regarding valve inspection and testing. The frequency and method of testing should be based on the recommendation of your boiler inspector and/or the valve manufacturer, and should be in

7-4 750-177

WARNING

DANGER

Safe operation of your boiler demands periodic inspection and maintenance of all low water cutoff devices. If controls do not shut off the burner when the water level drops below the safe operating level, or if controls appear in poor physical condition, or become erratic in operation, they must be repaired or replaced at once. Failure to heed this warning could result in serious personal injury or death.

If test-n-check valves are installed on the float style low water cutoff devices, these controls can be tested by opening the blow down valve. The test-n-check valves restrict water flow

Inspection and Maintenance Chapter 7

when the blow down valve is open allowing water to drain from the control. The test-n-check valves permit testing of the control without draining the entire system therefore allowing regularly scheduled verification of float style low water cutoff.

Low Water Controls (Steam Boilers)

The need to periodically check water level controls and the waterside of the pressure vessel cannot be overemphasized. Most instances of major boiler damage are the result of operating with low water or the use of untreated (or incorrectly treated) water.

Always be sure of the boiler water level. The water column should be blown down routinely. Check samples of boiler water and condensate in accordance with procedures recommended by your water consultant. Refer to sections E and I in Chapter 3 for blowdown instructions and internal inspection procedures.

A typical water level control is mounted in the water column and has float actuated mercury switches. One switch is connected to the burner limit circuit and will stop the burner if a low water condition occurs. The other switch is connected to the feedwater circuit to energize a water pump or feeder valve to maintain water at the proper operating level.

If a control does not break the circuit to stop the burner at the proper point then shut down the burner immediately. Failure to do so may result in damage to the equipment.

Do not restart until all cross-connecting piping is checked for obstructions. Also check the float bowl. If these are clean, repair or replace the control. Repeat the above test to ensure proper operation prior to returning the boiler to service.

On a steam boiler, the head mechanism of the low water cutoff device(s) should be removed from the bowl at least once a month to check and clean the float ball, the internal moving parts, and the bowl or water column.

Remove the pipe plugs from the tees or crosses and make certain the cross- connecting piping is clean and free of obstructions. Controls must be mounted in a plumb position for proper performance. Determine that piping is vertically aligned after shipment and installation and throughout the life of the equipment.

A scheduled blowdown of the water controls on a steam boiler should be maintained.

CAUTION

DANGER

Usually, the control is of the automatic reset type and will remake the limit circuit when the water level is restored. Some applications require that a control be equipped with a manual reset mechanism that must be manually reset before the burner can be restarted. This is usually accomplished with the use of a second or auxiliary control that has this feature.

Since low water cutoff devices are generally set by the original manufacturer, no attempt should be made to adjust these controls to alter the point of low water cutoff or point of pump cut-in or cut-out. If a low water device should become erratic in operation or if its setting changes from previous established levels, check for reasons and correct: Repair or replace as required.

These controls normally function for long periods of time, which may lead to laxity in testing on the assumption that normal operation will continue indefinitely.

The controls' operation may be checked by stopping the water supply to the boiler while the burner is operating at low fire. While under constant attendance, allow the water level to drop at a normal rate. Check for proper operation of the feedwater controller and the low water cutoffs.

Water Gauge Glass

A broken or discolored glass must be replaced at once. Periodic replacement should be a part of the maintenance program. Always use new gaskets when replacing a glass. Use a proper size rubber packing. Do not use “loose packing,” which could be forced below the glass and possibly plug the valve opening.

Close the valves when replacing the glass. Slip a packing nut, a packing washer, and packing ring onto each end of the glass. Insert one end of the glass into the upper gauge valve body far enough to allow the lower end to be dropped into the lower body. Slide the packing nuts onto each valve and tighten.

If the glass is replaced while the boiler is in service, open the blowdown and slowly bring the glass to operating temperature by cracking the gauge valves slightly. After glass is warmed up, close the blowdown valve and open the gauge valves completely.

Check trycocks and gauge cocks for freedom of operation and clean as required.

It is imperative that the gauge cocks are mounted in exact alignment. If they are not, the glass will be strained and may fail prematurely.

750-177 7-5

A blowdown cock is provided on the lower gauge glass fitting and a daily blowdown is recommended.

Chapter 7 Inspection and Maintenance

Electrical Controls

The operating controls should be inspected monthly. Examine the tightness of electrical connections and keep the controls clean. Remove any dust that accumulates on the interior of the controls using low pressure air that is free of moisture and oil. Take care not to damage the mechanism.

Examine any mercury tube switches for damage or cracks. Dark scum over the normally bright surface of the mercury indicates a damaged tube that may lead to erratic switching action. Make certain that controls are correctly leveled. Covers should remain on controls and panels at all times. Dust and dirt can cause excessive wear or overheating of the motor stator and the relay contacts, and affect operation of other controls. The power supply to the boiler must be protected with dual element fuses (fusetrons) or circuit breakers. Similar fuses should be used in branch circuits. Standard one-shot fuses are not recommended.

Flame Safeguard Control

This control requires minimal maintenance because the safety and logic sections are integral and inaccessible, with no accessible contacts. Regularly check to see that the retaining screws holding the chassis to the mounting base are secure, and that the amplifier and the program module are securely inserted.

It is recommended that a spare control be kept on hand and service be rotated between the active and the spare control (programmer).

Note: NOTE: Be sure that the connecting contacts on the control and the base are not bent out of position.

WARNING

DANGER

When replacing a control, be sure to lock out the main power supply, since the control is “hot” even though the burner switch is off. Failure to heed this warning could result in serious personal injury or death.

Refer to the burner manual for information regarding tests of the flame safeguard system. Contact your local CleaverBrooks authorized representative for assistance, if required.

Checking Loss of Flame

With the burner in normal operation at the low fire rate, shut off the main burner fuel valve to interrupt the fuel supply and extinguish the main flame.

The relay must signal the loss of flame, resulting in the fuel valve(s) being deenergized. The control will lock out on a safety shutdown. The flame failure light (and optional alarm) will be activated. The blower motor will stop.

Turn the burner switch off. Reset the safety switch. Reestablish the main fuel supply.

F. OIL BURNER MAINTENANCE

Refer to the burner sections for specific information regarding operation and maintenance of the burner.

Oil strainers should be serviced frequently in order to maintain a free and full flow of fuel to the burner. Installation of a vacuum gauge in the burner supply line between the burner oil pump and the strainer is strongly recommended. Regular observation and recording of the gauge indication will assist in determining when the strainer needs servicing.

Strainer Servicing

The fuel oil strainer element must be removed and cleaned or replaced at regular intervals, or when a rising trend in the burner supply pump suction indicates blockage. When servicing the strainer, fuel supply and return line valves should be shut off. The strainer should be drained of oil and any sediment collected at the bottom of the canister. Remove the cover and withdraw the strainer element. Replaceable elements should be disposed of properly. Reusable elements may be cleaned by immersing them in solvent until attached deposits have been loosened, and then shaking them dry.

WARNING

DANGER

Your spare control should be wrapped in plastic and stored in a dry atmosphere. During an extended shutdown (for example, a seasonal shutdown), the active control should be removed and stored in a dry atmosphere. Moisture can cause problems with control operation.

The flame detector lens should be cleaned as often as operating conditions demand. Use a soft cloth moistened with detergent to clean the lens.

A safety check procedure should be established to test the complete flame safeguard system at least once a month. Tests should verify safety shutdown and a safety lockout upon failure to ignite the main flame and upon loss of flame. Each of these conditions should be checked on a scheduled basis.

7-6 750-177

Use only safety type solvents such as Cleaver-Brooks “Safety Solvent” for cleaning strainers or other components. Work only in a well ventilated area. Do not use gasoline or other flammable liquids as a solvent. Do not dry the strainer elements with compressed air. Failure to heed this warning could result in serious personal Injury or death.

Reassemble the strainer, taking care to seal the canister properly to avoid air infiltration and resulting loss of suction. Open the fuel supply and the return line valves.

Inspection and Maintenance Chapter 7

G. GAS BURNER MAINTENANCE

Refer to the burner sections for specific information regarding operation and maintenance of the burner. The motorized gas valve requires little maintenance, as the operating mechanism is immersed in oil and completely sealed. However, proper operation should be checked on a routine basis.

Keep the outer parts of the valve(s) clean, especially the stem between the operator and the valve. A nicked, scored, or otherwise damaged valve stem can cause leakage. Do not remove dust covers if installed.

The stem packing gland is the O-ring type. If oil is noticed around the operator base, or if leakage occurs, the valve must be repaired. If the actuator is sluggish or fails to operate, and the oil level is known to be correct, the operator portion should be replaced.

Solenoid Valves

Foreign matter between the valve seat and the seat disc will cause leakage. Valves are readily disassembled; however, care must be taken to see that internal parts are not damaged during removal and that reassembly is in the proper order.

A low hum or buzzing will normally be audible when the solenoid coil is energized. If the valve emits a loud buzzing or a chattering noise, check for proper voltage. If voltage is correct, clean the plunger assembly and interior plunger tube thoroughly. Do not use any oil. Make sure that the plunger tube and solenoid are tight when assembled. Take care not to nick, dent, or damage the plunger tube.

Solenoid coils can be replaced without removing the valve from the line.

WARNING

DANGER

Be sure to disconnect the main power supply to the boiler in order to prevent the possibility of electrical shock, which could result in serious personal injury or death.

Check the coil position and make sure that any insulating washers or retaining springs are reinstalled in the proper order.

H. REFRACTORY

The boiler is shipped with completely installed refractory. High temperature refractory lines the burner door and floor of the boiler. Front and rear walls, side casing panels, the roof section, the bottom drum and the drum vent are protected with high temperature insulation. Preventive maintenance through periodic inspection will keep the operator aware of

the condition of the refractory and insulation and will guard against unexpected downtime for repairs.

I. CASING SEALS

The most obvious indication of a problem is the appearance of discolored paint on the casing or soot and hot gases escaping at seal joints. It is important that at start-up any problems are noted and corrected before the boiler is put back into operation. The following are areas requiring inspection.

Burner Door

Inspect the area around the door and look for discolored paint or evidence of combustion gas leakage. If a problem is noted or the door is being opened for scheduled maintenance look for warped sealing surfaces and make sure that the insulation on the front wall around the door has not pushed away from the wall. Cracks may appear in the burner door refractory as a result of expansion and contraction from operation. If cracks are larger than 1/8” when the refractory is cooled, the cracks should be filled with a high temperature bonding airdry mortar such as Cleaver- Brooks “Corline.”

WARNING

DANGER

Disconnect main power to the boiler and the pilot fuel supply to the burner before the burner door is opened. Electrical power and fuel supply must remain shut off at all times when the burner door is open. Failure to heed this warning could result in serious personal Injury or death.

Access to the boiler furnace area is gained through the burner door opening at the front of the boiler. Whenever the burner is opened, the gasket and gasket surfaces of the burner door should be inspected. A good seal between the burner door and the boiler is necessary to prevent leakage of combustion gases and loss of efficiency. Combustion gas leaks can cause hot spots with subsequent damage to the burner door and surrounding refractory. Damaged or hardened gaskets must be replaced before the burner is put back in operation.

If a new gasket is necessary, remove the old gasket and clean the gasket surface on the wall and burner door. A spray adhesive is used to hold the rope gasket in place around the burner opening. A high temperature silicone may be needed to seal under the rope gasket at the wall seams. The rope gasket should wrap around the opening at least two times.

Before the burner door is closed, inspect studs and clean threads if necessary with 1/2"-13 die. Apply a small amount of Cleaver-Brooks "Never-Seez" (p.n. 797-1814 or 797-

1816) to the studs. Any nuts that are difficult to thread on studs should be replaced. Door fasteners should be run in and tightened evenly to avoid distorting the door or damaging the

750-177 7-7

Chapter 7 Inspection and Maintenance

gasket. Start tightening at the top and proceed around the door, alternately tightening opposite fasteners until all are snug. After the boiler is back in operation, check for gas leaks around the door opening, and retighten the fasteners as required to provide a gas-tight seal.

Drum Seals

Inspect the areas around the drum seals and look for soot or hot gas leaks. If a problem is noted look for the source of the leak. Remove the old insulation and sealant from around the drum. Using a pumpable insulation material (p.n. 872-680), fill the void flush with the outside of the wall. Allow the area to set up and apply a thick bead of high temperature silicone around the drum and install the cover plates.

Sight Port

Inspect the area around the sight port for paint discoloration. A hot spot around the rear sight port is caused by either a poor seal between the sight port insulator and the wall, a cracked insulator or a flue gas leak at the sight port cap.

Check the threads of the cap and sight tube. If necessary, clean the threads and/or replace the cap. If the screws that hold the sight glass retainer in place are leaking tighten the screws or replace the cap.

7-8 750-177

CHAPTER 8

PARTS

Flextube Casing, Hot Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2,3

Flextube Casing, Low Pressure Steam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4,5

Flextube Casing, High Pressure Steam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6,7

Steam Pressure Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8

Water Level Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9,10

Water Column, Main and Aux. - 15# Steam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11

Water Column, Main and Aux. - 150# Steam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12

8-2 750-177

Figure: 8-1 Typical Hot Water Flextube Casing

750-177 8-3

Part List, Hot Water 250 350 500 800 1100

ITEM DESCRIPTION PART #

REQ

PART # REQ PART # REQ PART # REQ PART # REQ

1. Base 315-1124 1 315-1169 1 315-1180 1 315-1194 1 315-1203 1

2. Roof 315-1127 1 315-1167 1 315-1178 1 315-1192 1 315-1202 1

3.a Front wall, w/o Hinge 315-1262 1 315-1265 1 n/a n/a n/a

3.b Front wall w Hinge 315-1128 1 31 5-1166 1 315-1177 1 315-1191 1 315-1201 1

Rear wall-large piece 315-1129 1 315-1165 1 315-1176 1 315-1190 1 315-1190 1

Outer casing panel 315-1 130 6 315-1164 6 315-1175 8 315-1189 10 315-1198 12

Outer casing strips-top 315-1 131 2 315-1163 2 315-1174 2 315-1188 2 315-1197 4

Plate, base to wall 315 -1132 4 315-1132 4 315-1132 4 315-1132 4 315-1132 4

Outer casing strips corner strip 315-1133 4 315-1 162 4 315-1173 4 315-1187 4 315-1187 4

Burner plate Note 5 1 Note 5 1 Note 5 1 Note 5 1 Note 5 1

10.

Inner side panel Left Hand 315-1135 2 315-1161 2 315-1172 2 315-1186 2 315-1196 2

11.

Inner side panel Right Hand 315-1136 2 315-1160 2 315-1171 2 315-1185 2 315-1195 2

12.

Mounting Plate 315-1143 1 315-1143 1 315-1143 1 315-1143 1 315-1143 1

13.

Plate, Collar, Lower Outer 315-694 2 315-694 2 315-695 2 315-695 2 315-695 2

14.

Plate, Collar, Upper Outer 315-1159 2 315-1159 2 315-1183 2 315-1183 4 315-1210 2

15.

Plate, Cover, Lug, Lifting 315-1100 1 315-1100 1 315-1100 1 315-1099 1 315-1099 1

16.

Cap, sight 550-42 1 550-42 1 550-42 1 55 0-42 1 550-42 1

17.

Capscrew, hex hd. 3/8”-16x 3/4”lg 868-1506 26 868-1506 28 868-1506 60 868-1506 96 868-1506 128

18.

Capscrew, hex hd. 1/2”-13x 1-1/2”lg 868-102 8 868-102 8 868-102 8 868-102 8 868-102 8

19.

Capscrew, hex hd. 5/8”-11x 1-1/2”lg 868-188 8 868-188 8 868-188 8 868-188 8 868-188 8

20.

Screw, self tapping, ¼” x 1”lg 841-423 50 841-423 50 841-423 50 841-423 50 841-423 54

21.

Locknut, hex hd., 3/8” 869-510 118 869-510 124 869-510 180 8 69-510 232 869-510 2 84

22.

Nut, hex hd., ½” brass 869-27 12 869-27 12 869-27 12 869-27 12 869-27 12

23.

Nut, hex hd., ½” 869-144 24 869-144 24 869-144 24 869-144 28 869-144 28

24.

Capscrew, Hex hd ¾”-10 x 6” LG 868-600 2 868-600 2 868 -600 2 868-600 2 868-600 2

25.

Washer, flat, ½” 952-286 44 952-286 44 952-286 44 952-286 48 952-286 48

26.

Washer, flat, 5/8” 952-321 8 952-321 8 952-321 8 952-321 8 952-321 8

27.

Never-Seez 797-1816 1 797-1816 1 797-1816 1 797-1816 1 797-1816 1

28.

Inner Casing Spacer Block 315-1336 8 315-1336 8 315-1336 12 315-1336 16 315-1336 20

29.

Inner Side Panel Mid Left n/a n/a n/a 315-1294 2 315-1294 2

30.

Inner Side Panel Mid Right n/a n/a n/a 315-1208 2 315-1208 2

31.

Inner Side Panel Mid n/a n/a 315-1206 2 n/a 315-1209 2

32.

Retaining Plates, Lower, Inner, Small 315-1178 3 315-1178 3 315-1280 3 315-1280 3 315-1280 3

33.

Retaining Plates, Lower, Inner, Large 315-1158 1 315-1158 1 315-1182 1 315-1182 1 315-1182 1

34.

Plate, collar, upper, inner 315-1204 2 315-1204 2 315-1207 2 n/a 315-1183 2

35.

Assembly, rear wall corner piece 315-1140 1 315-1279 1 315-1281 1 315-1282 1 315-1282 1

36.

Gasket, Expanded PTFE 3/8” x 3/16” 32-2560 70 ft 32-2560 75 ft 32-2560 99 ft 32-2560 127ft 32-2560 149ft

37.

Handle, Flush Mount, Snap In 865-68 12 865-68 12 865-68 16 865-68 16 865-68 24

8-4 750-177

Figure: 8-2 Typical Low Pressure Steam Flextube Casing

CleaverBrooks FLX Operation, Service And Parts Manual

Specifications and Main Features

Frequently Asked Questions

User Manual