Lennox International Inc. GSB8-E, GSB8-S User Manual

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PRODUCT LITERATURE

WARNING

Lennox Industries Inc. Dallas, Texas

INSTALLATION

INSTRUCTIONS

GSB8-E

GAS-FIRED STEAM BOILER

GSB8-S

GAS-FIRED STEAM BOILER

RETAIN THESE INSTRUCTIONS

FOR

FUTURE REFERENCE

These instructions must be

afﬁ xed on or adjacent to the

boiler.

GAS-FIRED HOT WATER BOILERS

These Gas-Fired Water Boilers are low pressure, sectional cast iron boilers Design Certified by CSA (Canadian Standards Association) for use with Natural and Propane Gases. They are constructed and hydrostatically tested for a maximum working pressure of 50 psi (pounds per square inch) in accordance with A.S.M.E. (American Society of Mechanical Engineers) Boiler and Pressure Vessel Code Section IV: Rules for Construction of Heating Boilers.

WARNING

Improper installation, adjustment, alteration, service, or maintenance can cause injury or property damage. Refer

to this manual. For assistance or additional information consult a qualiﬁ ed installer, service agency, or the gas supplier.

P/N# 14683453, Rev. A [07/2011]

TABLE OF CONTENTS

Safety Symbols .............................................................................................................. 3

Boiler Ratings And Capacities ........................................................................................... 4

Before You Start ............................................................................................................. 5

Locating The Boiler ......................................................................................................... 5

Fresh Air For Combustion................................................................................................. 6

Installation - System Piping ............................................................................................. 7

Chimney And Vent Pipe Connection ................................................................................. 10

Vent Damper Operation ................................................................................................. 11

Gas Supply Piping ......................................................................................................... 12

Electrical Wiring ........................................................................................................... 14

Controls And Accessories ............................................................................................... 20

Operating Instructions ................................................................................................... 22

Intermittent Ignition Boiler - VR8204A/VR8304M Gas Valve Operating Instructions ................ 22

Continuous Pilot Boiler - VR8200A/VR8300A Gas Valve Operating Instructions ...................... 23

Operating Instructions ................................................................................................... 24

Checking and Adjusting ................................................................................................. 25

Cleaning Your Boiler ...................................................................................................... 27

Maintaining Your Boiler .................................................................................................. 28

Service Hints ............................................................................................................... 30

Repair Parts ................................................................................................................. 31

KEEP THIS MANUAL NEAR BOILER

RETAIN FOR FUTURE REFERENCE

GSB8-E

GAS-FIRED STEAM BOILER

GSB8-S

GAS-FIRED STEAM BOILER

SAFETY SYMBOLS

The following deﬁ ned symbols are used throughout this manual to notify the reader of potential hazards of varying risk levels.

DANGER

Indicates a hazardous situation which, if not avoided, WILL result in death or serious injury.

WARNING

Indicates a hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION

Indicates a hazardous situation which, if not avoided, may result in minor or moderate injury.

READ ALL INSTRUCTIONS BEFORE INSTALLING.

WARNING

Keep boiler area clear and free from combustible materials, gasoline and other ﬂ ammable vapors and liquids.

DO NOT obstruct air openings to the boiler room.

Modiﬁ cation, substitution or elimination

of factory equipped, supplied or speciﬁ ed components may result in property damage, personal injury or the loss of life.

To owner: Installation and service of this boiler must be performed by qualiﬁ ed installer.

When this product is installed in the Commonwealth of Massachusetts the installation must be performed by a Licensed Plumber or Licensed Gas Fitter.

NOTICE

Indicates information which should be followed to ensure proper installation and operation.

To installer: Leave all instructions with boiler for future reference.

WARNING

All installations of boilers and venting should be done only by a qualiﬁ ed expert and in accordance with the appropriate Installation, Operation and Maintenance manual.

Installing or venting a boiler or any other gas appliance with improper methods or materials may result in serious injury or death due to ﬁ re or to asphyxiation from poisonous gases such as carbon monoxide which is odorless and invisible.

Installation shall conform to requirements of authority having jurisdiction or in absence of such requirements:

United States

•

National Fuel Gas Code, ANSI Z223.1/NFPA 54•

National Electrical Code, NFPA 70.•

Canada •

Natural Gas and Propane Installation Code, • CAN/CSA B149.1.

Canadian Electrical Code, Part I, Safety Standard • for Electrical Installations, CSA C22.1

Figure 1 - Dimensions

BOILER RATINGS AND CAPACITIES

BOILER SPECIFICATIONS

Natural gas Propane

Model No.

Type of Ignition

Input *MBH (KW)

GSB8-075E Electronic

GSB8-075S Standing Pilot 81.1

GSB8-112E Electronic

GSB8-112S Standing Pilot 78.8

GSB8-150E Electronic

GSB8-150S Standing Pilot 79.2

GSB8187E Electronic

GSB8187S Standing Pilot 79.6

GSB8-225E Electronic

GSB8-225S Standing Pilot 80.1

GSB8-262E Electronic

GSB8-262S Standing Pilot 80.5

GSB8-299E Electronic

GSB8-299S Standing Pilot 80.9

75,000

(22.0)

112,500

(33.0)

105,000

(44.0)

187,000

(54.8)

225,000

(65.9)

262,000

(76.9)

299,000

(87.6)

*MBH (KW)

Heating Capacity

62,000

(18.5)

91,000

(26.7)

122,000

(35.7)

153,000

(44.8)

183,000

(53.6)

214,000

(62.7)

245,000

(71.8)

(KW)

Net I=B=R *MBH

47,000

(14.7)

68,000

(19.9)

92,000

(27.0)

115,000

(33.7)

137,000

(40.1)

161,000

(47.2)

184,000

(53.9)

sq.ft. Radiation

Net I=B=R Rating

196

(18.2)

283

(26.3)

383

(35.6)

479

(44.5)

571

(53.0)

671

(62.3)

767

(71.3)

Input *MBH (KW)

70,000

(20.0)

105,000

(30.8)

140,000

(41.0)

175,000

(51.3)

210,000

(61.5)

245,000

(71.8)

280,000

(82.0)

Heating Capacity

58,000

(16.1)

85,000

(24.9)

114,000

(33.4)

143,000

(41.9)

171,000

(50.1)

200,000

(58.6)

229,000

(67.1)

Net I=B=R

*MBH (KW)

*MBH(KW)

44,000

(13.0)

64,000

(18.6)

86,000

(25.2)

107,000

(31.4)

128,000

(37.5)

150,000

(44.0)

172,000

(50.4)

(17.0)

(24.8)

(33.3)

(41.4)

(51.4)

(58.1)

(66.7)

sq.ft. Radiation

Net I=B=R Rating

82.7

183

80.4

267

80.6

358

80.9

446

81.1

553

81.3

625

81.5

717

AFUE %

Number of Sections

round

Diameter in. (mm)

Flue Size Connection

(12.7)

(15.2)

(17.8)

325

(147)

404

(183)

483

(219)

564

(256)

649

(294)

719

(326)

800

(363)

(kg) Package

Sipping Weight Lbs.

tion NPT in. (mm)

Supply & Return Connec-

2-1/2

(64.0)

in. (mm)

Drain Connection NPT

3/4

(19.0)

* MBH = 1,000 Btuh. Btuh = British Thermal Unit Per Hour. ** Add 5½" to height for Vent Damper † For altitudes above 2,000 ft. reduce input rate 4% for each 1,000 ft. above sea level. Heating Capacity is based on DOE (Department of Energy) test procedure. (1) Add model number sufﬁ x 'P' for Propane Gas.

BEFORE YOU START

Net I=B=R steam Ratings shown are based on piping and pickup allowance of 1.333.

Base selection of boiler size on "Net I=B=R Rating" being equal to or greater than installed radiation in square feet. Consult manufacturer before selecting a boiler for installations having unusual piping and pickup requirements,such as intermittent system operation, exhaust piping systems, etc. Speciﬁ cations and dimensions are subject to change without notice.

For elevations above 2000 ft. (600m):

USA - Reduce input rate 4% for each 1,000 ft (300m) • above sea level.

Canada - Boiler certiﬁ ed for altitudes of 0-2000 ft • (610m) above sea level. Reduce input rate 10% for altitudes 2000-4500 ft (610-1350) above sea level. Contact Provincial authority having jurisdiction for

installations above 4500 feet (1350 m) above sea level. Verify you have right size boiler before starting installation. See rating and capacity table on previous page. Verify boiler is for type of gas you are using. Check rating plate on right side of boiler.

Verify boiler is supplied with correct type of gas, fresh air for combustion, and suitable electrical supply. Also, boiler must be connected to suitable venting system and adequate piping system. Finally, thermostat, properly located, is needed for control of heating system. If you have any doubts as to various requirements, check with local authorities and obtain professional help where needed. Take time to complete all steps for SAFE and PROPER operation of heating system.

If this boiler is installed in building under construction, special care must be taken to insure clean combustion air supply during construction process. Airborne particulates such as from drywall dust and from ﬁ berglass insulation can clog burner ports and cause incomplete combustion and sooting.

Boilers are designed for use in closed heating systems where all steam is returned to boiler as condensate and amount of make-up water required is minimal. Boilers are not designed for or intended for use in open systems of process applications using 100% make-up water. Damage to boiler resulting from such use shall not be covered under warranty.

Installation shall conform to requirements of authority having jurisdiction or in absence of such requirements:

Where required by authority having jurisdiction, installation shall conform to Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME CSD-1.

Following steps are all necessary for proper installation and safe operation of your boiler.

1. LOCATING THE BOILER 5. GAS SUPPLY PIPING

2. FRESH AIR FOR COMBUSTION 6. ELECTRICAL WIRING

3. INSTALLATION - SYSTEM PIPING 7. CHECKING & ADJUSTING

4. CHIMNEY & VENT PIPE CONNECTION

LOCATING THE BOILER

Select level location as centralized with piping system,

and as near chimney as possible.

Place crated boiler at selected location, remove crate

by pulling crate sides from top and bottom boards.

Combustible ﬂ oors: When boiler is to be installed on

combustible ﬂ oor, Special Base Plate must be used -

146-14-031 (2-6 Section) or 146-14-032 (7-9 Section).

This boiler must not be installed on carpeting.

Boiler is to be level. Metal shims may be used under

base legs for ﬁ nal leveling.

Equipment shall be installed in location in which

facilities for ventilation permit satisfactory combustion

of gas, proper venting, and maintenance of ambient

temperature at safe limits under normal conditions of

use. Equipment shall be located so as not to interfere

with proper circulation of air. When normal inﬁ ltration

does not provide necessary air, outside air shall be

introduced (See Page 6 - “Fresh Air for Combustion”).

Advise owner to keep air passages free of obstructions.

Ventilating and combustion air must enter boiler room

without restrictions.

United States •

National Fuel Gas Code, ANSI Z223.1/NFPA 54. • National Electrical Code, NFPA 70.•

Canada •

Natural Gas and Propane Installation Code, • CAN/CSA B149.1.

Canadian Electrical Code, Part I, Safety Standard for • Electrical Installations, CSA C22.1

Install boiler such that automatic gas ignition system components are protected from water (dripping, spraying, rain, etc.) during appliance operation and service (condensate trap, control replacement, etc.).

Table - 1 Minimum Clearance

Dimensions

Top 6" (16 cm)

Rear 6" (16 cm)

Control Side 7" (18 cm)

Opposite Side 6" (16 cm)

Front Alcove

Flue/Vent Connector 6" (16 cm)

Near Boiler Piping 1" (2.5 cm)

Unit must be set on concrete or other non-combustible material base or ﬂ oor.

FRESH AIR FOR COMBUSTION

WARNING

Air openings to combustion area must not be obstructed. Following instructions below, adequate combustion air can be maintained.

Provide combustion air and ventilation air in accordance with the section “Air for Combustion and Ventilation,” of the National Fuel Gas Code, ANSI Z223.1/NFPA 54, or Sections

8.2, 8.3 or 8.4 of Natural Gas and Propane Installation Code, CAN/CSA B149.1, or applicable provisions of local building codes.

Provide make-up air where exhaust fans, clothes dryers, and kitchen ventilation equipment interfere with proper operation.

National Fuel Gas Code recognizes several methods of obtaining adequate ventilation and combustion air. Requirements of the authority having jurisdiction may override these methods.

Engineered Installations. Must be approved by •

authority having jurisdiction.

Mechanical Air Supply. Provide minimum of 0.35 •

cfm per Mbh for all appliances located within space.

Additional requirements where exhaust fans installed.

Interlock each appliance to mechanical air supply

system to prevent main burner operation when

mechanical air supply system not operating.

All Indoor Air. Calculate minimum volume for all •

appliances in space. Use a different method if

minimum volume not available.

Standard Method. Cannot be used if known air A. inﬁ ltration rate is 0.40 air changes per hour. See Table 1 for space with natural gas boiler only. Use equation for multiple appliances and/or propane.

Volume ≥ 50 ft

Known Air Inﬁ ltration Rate. See Table 1 for B. space with boiler only. Use equation for multiple appliances. Do not use an air inﬁ ltration rate (ACH) greater than 0.60.

Volume ≥

Refer to National Fuel Gas Code for opening C. requirements between connected indoor spaces.

All Outdoor Air. Provide permanent opening(s) • communicating directly or by ducts with outdoors.

Two Permanent Opening Method. Provide opening A. commencing within 12 inches of top and second opening commencing within 12 inches of bottom of enclosure.

Direct communication with outdoors or  communicating through vertical ducts. Provide minimum free area of 1 in² per 4 Mbh of total input rating of all appliances in enclosure.

Communicating through horizontal ducts.  Provide minimum free area of 1 in² per 2 Mbh of total input rating of all appliances in enclosure.

One Permanent Opening Method. Provide opening B. commencing within 12 inches of top of enclosure. Provide minimum clearance of 1 inch on sides/back and 6 inches on front of boiler (does not supersede clearance to combustible materials).

Refer to National Fuel Gas Code for additional C. requirements for louvers, grilles, screens and air ducts.

Combination Indoor and Outdoor Air. Refer to National • Fuel Gas Code for application information.

x Total Input [Mbh]

21 ft3⁄ACH x Total Input [Mbh]

Table 3 - Minimum Room Volume, Indoor Air Only*

Input Mbh

Standard

Method

0.1 0.2 0.3 0.4 0.5 0.6

Known Air Inﬁ ltration Rate Method (Air Changes Per Hour)

75 3750 15750 7875 5250 3938 3150 2625

112.5 5625 23625 11813 7875 5906 4725 3938 150 7500 31500 15750 10500 7875 6300 5250 187 9350 39270 19635 13090 9818 7854 6545 255 11250 47250 23625 15750 11813 9450 7875

262.5 13125 55125 27563 18375 13781 11025 9188 299 14950 62790 31395 20930 15698 12558 10465

* Table values based on boiler only. Add volume for any additional appliances.

INSTALLATION - SYSTEM PIPING

WARNING

Burn and scald hazard. Safety valve could

discharge steam or hot water during operation. Install discharge piping per these instructions

Near boiler piping, that is the piping around boiler, must be considered as part of boiler for proper water level control, and to produce dry steam. Correct near boiler piping is crucial to the proper operation of the boiler and the heating system. Follow these recommendations carefully.

Place boiler in selected location, as near chimney as

possible. Install safety valve, using furnished 3/4” coupling, into

3/4” pipe nipple on top of boiler.

Install safety valve with spindle in vertical position.•

Do no install shutoff valve between boiler and safety • valve.

Install discharge piping from safety valve. See Figure •

Use 3/4" or larger pipe.•

Use pipe suitable for temperatures of 375°F (191°C) • or greater.

Individual boiler discharge piping shall be • independent of other discharge piping.

Size and arrange discharge piping to avoid reducing • safety valve relieving capacity below minimum relief valve capacity stated on rating plate.

Run pipe as short and straight as possible to location • protecting user from scalding and properly drain piping.

Install union, if used, close to safety valve outlet.•

Install elbow(s), if used, close to safety valve outlet • and downstream of union (if used).

Terminate pipe with plain end (not threaded).•

This boiler is equipped with two 2-1/2” supply connections and two 2-1/2” return connections, one each on both the left and right sides of the boiler. Unused connections must be plugged with the 2-1/2” plugs (furnished).

Figure 2 - Recommended Near Boiler Piping Using One Supply Tapping

INSTALLATION - SYSTEM PIPING

Recommended near boiler piping for gravity return

systems is shown in Figure 5. This conﬁ guration uses one supply and one return tapping. This setup can be used on any size boiler in this series. The supply and return connections may be piped both into the same side (either left or right) or one into each side of the boiler.

For installers choosing to use both supply tappings,

Figure 6A shows the correct way to pipe this system. Figure 6B shows the wrong way to pipe a header with

two risers.

Headers must be ﬁ tted with header offsets or swing • joints, or be equipped with expansion joints, so that thermal expansion and contraction of the header will not damage the boiler. Headers shall not be welded.

System takeoffs from the header must be between • the equalizer and the riser to the header nearest the equalizer. System takeoffs must never be between two risers.

Figure 3A - Recommended Near Boiler Piping Using One Supply Tapping

System takeoffs from the header must never be bull-

headed. If the steam main goes in two directions, there must be two takeoffs from

main.

All boilers in gravity return systems

with a Hartford Loop as shown in Figures 2 and 3A. When piping the vertical risers from the boiler to the

header, the bottom of the header must be a minimum of 24 inches above the water level line on the right side of the boiler.

Steam riser(s) and header shall be 2-1/2” pipe size.

Equalizer line shall be minimum 1-1/2” pipe size.

10.

The near boiler piping shall include a 2-1/2” tee with a

11.

plug located on the supply line as shown for skimming (i.e. surface blowdown).

The near boiler piping shall include a 1-1/2 ball valve

12.

in the return piping as shown for bottom blowdown and draining.

the header, one for each

must be equipped

INSTALLATION - SYSTEM PIPING

For gravity return systems, the bottom of the lowest

13.

steam carrying pipe, be it a dry return, or the end of the steam main, must be at least 28” above the normal water level line on the right side of the boiler. This is known as

“Dimension A.” For pumped return systems, follow the condensate

14.

pump or boiler feed pump manufacturer’s instructions for proper installation and hookup.

In connecting the cold water supply to the water inlet

15.

valve, make sure that a clean water supply is available. When the water supply is from a well or pump, a sand

strainer should be installed at the pump.

FOR USE WITH COOLING UNITS

The boiler, when used in connection with a A. refrigeration system, must be installed so the chilled medium is piped in parallel with the boiler with appropriate valves to prevent the chilled medium from entering the boiler. See Figure 4.

Figure 3B - Common Near Boiler Piping Mistakes

Figure 4 - Chilled Water Piping

VALVES A & B OPEN FOR HEATING; CLOSE FOR COOLING

VALVES C & D CLOSE FOR HEATING; OPEN FOR COOLING

CHIMNEY AND VENT PIPE CONNECTION

For boilers for connection to gas vents or chimneys, vent installations shall be in accordance with National Fuel Gas Code, ANSI Z223.1/NFPA 54, or "Venting Systems and Air Supply for Appliances," of the Natural Gas and Propane Installation Code, CAN/CSA B149.1, or applicable provisions of the local building codes.

CHECK YOUR CHIMNEY

This is a very important part of your heating system. It must be clean, the right size, properly constructed and in GOOD CONDITION. No boiler can function properly with a bad chimney. Inspect the chimney and verify that the construction and size of the chimney meets all applicable provisions of the National Fuel Gas Code and local building codes. Figure 4 gives you an idea how a boiler might be vented to a chimney. Note that the height (HT) is measured from the vent pipe to the top.

CONNECTING THE VENT DAMPER AND VENT CONNECTOR

Refer to Fig. 1 and Table 1 for the size and location of the vent (ﬂ ue opening). Use a 28 gauge (minimum) galvanized pipe to connect to the chimney.

IMPORTANT - The damper blade on the furnished vent

damper has a 1/2 square inch hole (approximately 3/4” diameter). On boilers equipped with standing pilot, the hole must be left open. On boilers equipped with intermittent ignition, the hole should be plugged by using the plug supplied with the vent damper.

Position furnished vent damper on top of ﬂ ue outlet collar. Fasten damper securely to ﬂ ue outlet collar with sheet metal screws. Make sure damper blade has clearance to operate inside of diverter. Do not modify draft diverter or vent damper

As An Option

The damper may be installed in any horizontal or vertical position, closer to the ﬂ ue outlet collar

preferred. Follow the diagrams - Figures 6, 7 and 8. Install the vent damper to service only the single boiler

for which it is intended. The damper position indicator shall be in a visible location following installation. Locate the damper so that it is accessible for servicing.

The damper must be in the open position when

appliance main burners are operating. The boiler is equipped with a factory wired harness

that plugs into the vent damper. The thermostat must be connected to the black wires marked 24 volt thermostat on the boiler.

Vent pipe must be same size as the ﬂ ue outlet collar.

Slope pipe up from boiler to chimney not less than 1/4”

per foot. Run pipe as directly as possible with as few elbows as

possible. Do not connect to ﬁ replace ﬂ ue.

10.

The sections of vent pipe should be fastened with sheet metal screws to make the piping rigid. Horizontal portions of the vent system must be supported to prevent sagging. Use stovepipe wires every 5’ to support the pipe from above. If the vent pipe must go through a crawl space, double wall vent pipe should be used. Where vent pipe passes through a combustible wall or partition, use a ventilated metal thimble. The thimble should be 4 inches larger in diameter than the vent pipe.

MINIMUM VENT PIPE CLEARANCE

Wood and other combustible materials must not be closer than 6” from any surface of single wall metal vent pipe. Listed Type B vent pipe or other listed venting systems shall be installed in accordance with their listing.

REMOVING EXISTING BOILER FROM COMMON VENTING SYSTEM

When an existing boiler is removed from a common venting system, the common venting system is likely to be too large for proper venting of the appliances remaining connected to it.

At the time of removal of an existing boiler, the following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining connected to the common venting system are not in operation.

End of vent pipe must be ﬂ ush with inside face of chimney ﬂ ue. Use a sealed-in thimble for the chimney connection.

Horizontal run should not be longer than 3/4 the chimney height (HT) (Fig.5).

Seal any unused openings in the common venting system.

Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion and other deﬁ ciencies which could cause an unsafe condition.

Insofar as is practical, close all building doors and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dryers and any appliance not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close ﬁ replace dampers.

Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so appliance will operate continuously.

Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the ﬂ ame of a match or candle, or smoke from a cigarette, cigar or pipe.

CHIMNEY AND VENT PIPE CONNECTION

After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, ﬁ replace dampers and any other gas-burning appliance to their previous conditions of use.

Any improper operation of the common venting system should be corrected so the installation conforms with the National Fuel gas Code, ANSI Z223.1/NFPA 54, and/or the Natural Gas and Propane Installation Code, CAN/CSA B149.1. When re-sizing any portion of the common venting system, the common venting system should be re-sized to approach the minimum size determined using the appropriate tables in Chapter 13 of the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or the Natural Gas and Propane Installation Code, CAN/CSA B149.1.

Vent connectors serving appliances vented by natural draft shall not be connected into any portion of mechanical draft systems operating under positive pressure.

Figure 5 - Typical Masonry Chimney Requirements

Figure 6 - Horizontal Installation

VENT DAMPER OPERATION

Figure 7 - Alternate Vent Damper Installation

TYPICAL INSTALLATION FOR VENT DAMPER

NOTE CAUTION AND FOOTNOTES

Install the vent damper to service only the single

appliance for which it is intended. If improperly installed, a hazardous condition, such as an explosion or carbon monoxide poisoning, could result.

Do not install the vent damper on vent pipe curve.

Do not run wires near high temperature surfaces.

Use stand-off brackets if necessary.

VENT DAMPER OPERATION

For safe, efﬁ cient operation, the vent damper and all ﬂ ue product carrying areas of the appliance must be

checked annually by you, with particular attention given to deterioration from corrosion or other sources. If you see corrosion or other deterioration, contact your heating contractor for repairs. Check vent damper operation as follows:

When the boiler is off, check that the vent damper

positions indicator points to the closed position, Fig.

8. Turn the thermostat or controller up to call for heat

and check the vent damper indicator points to the open position, Fig. 8.

Turn the thermostat or controller down again and check

that the damper position indicator returns to the closed position.

If you have central air conditioning, set the thermostat

to COOL and turn it down to call for cooling. Cooling system should operate.

Return thermostat to desired position.

The vent damper must be inspected at least once a year by a trained, experienced service technician. The name of the person who originally installed your vent damper is shown on the installation label.

DO NOT turn damper open manually or motor

damage will result. Set switch to “AUTOMATIC OPERATION” to close vent damper during burner off cycle.

For further information, and for a vent damper troubleshooting guide, refer to the manual that was

packaged with the vent damper.

Figure 8 - Vent Damper Position Indicator

MANUAL OPERATION OF THE VENT DAMPER

The vent damper may be placed in the open position to permit burner operation by using the “HOLD DAMPER OPEN” switch, located on the damper controller. The thermostat will control the burner ﬁ ring as before, while the damper will remain open.

GAS SUPPLY PIPING

CAUTION

WHAT TO DO IF YOU SMELL GAS

Do not try to light any appliance.•

Do not touch any electrical switch; do not use •

General

Use piping materials and joining methods acceptable • to authority having jurisdiction. In absence of such requirements:

any phone in your building.

Immediately call your gas supplier from a • neighbor’s phone. Follow gas supplier’s instructions.

If you cannot reach your gas supplier, call the • ﬁ re department.

USA - National Fuel Gas Code, ANSI Z223.1/NFPA • 54

Canada - Natural Gas and Propane Installation Code, •

CAN/CSA B149.1

Install ﬁ eld sourced manual main shutoff valve and

• ground joint union.

Size and install gas piping system to provide

• sufﬁ cient gas supply to meet maximum input at not less than minimum supply pressure. See Table 4a & 4b.

NOTICE

Use two (2) wrenches when installing pipe to gas valve. Boiler's gas valve can be damaged if subjected to excessive torque.

Support piping with hooks straps, bands, brackets,

• hangers, or building structure components to prevent or dampen excessive vibrations and prevent strain on gas connection.

Use thread (joint) compound (pipe dope) suitable for

• liqueﬁ ed petroleum gas.

GAS SUPPLY PIPING

Provide sediment trap up stream of gas valve.

•

Propane Installation

Connections by licensed propane dealer only.

•

Use two stage regulator provided by propane

• supplier.

Propane supplier should check piping.

•

Leak Check Gas Piping

Pressure test boiler and gas connection before placing boiler in operation.

•

Pressure test over 1/2 psig (3.5 kPa). Disconnect boiler and its individual gas shutoff valve from gas supply system.

Pressure test at 1/2 psig (3.5 kPa) or less. Isolate

• boiler from gas supply system by closing manual gas shutoff valve.

Locate leakage using gas detector, noncorrosive

• detection ﬂ uid, or other leak detection method acceptable to authority having jurisdiction. Do not use matches, candles, open ﬂ ames, or other methods providing ignition source.

Figure 9 - Gas Piping At Boiler

Correct leaks immediately and retest.

•

Table - 4a Gas Pipe Sizes - Natural Gas

Length of

Pipe - Ft.

20 92,000 190,000 350,000 625,000

40 63,000 130,000 245,000 445,000

60 50,000 105,000 195,000 365,000

Table - 4b Gas Pipe Sizes - Propane Gas

Length of

Pipe - Ft.

20 131,000 216,000 189,000 393,000

40 90,000 145,000 129,000 267,000

60 72,000 121,000 103,000 217,000

* Outside diameter Length of pipe or tubing should be measured from the gas meter or propane second stage regulator.

Pipe Capacity - BTU Per Hour Input

Includes Fittings

1/2" 3/4" 1" 1 -1/4"

Pipe Capacity - BTU Per Hour Input

Includes Fittings

5/8" 3/4" 1/2" 3/4"

ELECTRICAL WIRING

ELECTRIC POWER SUPPLY

Electrically bond boiler to ground in accordance with requirements of authority having jurisdiction. Refer to:

USA- National Electrical Code, ANSI/NFPA 70.•

Canada - Canadian Electrical Code, Part I, CSA C22.1: • Safety Standard for Electrical Installations.

Run separate 115 volt circuit from separate overcurrent protective device in your electrical service entrance panel. This should be 15 ampere circuit. Locate shut-off switch at boiler. It must be turned off during any maintenance. Connect 115 volt electrical supply to primary leads on 24 volt transformer. Solder and tape or securely fasten these connections with wire nuts.

Boiler, when installed, must be electrically grounded in accordance with requirements of the authority having jurisdiction or, in absence of such requirements, with National Electrical Code, ANSI/NFPA No. 70 and/or Canadian Electrical Code, Part I, CSA C22.1: Safety Standard for Electrical Installations. Run 14 gauge or heavier copper wire from boiler to grounded connection in service panel or properly driven and electrically grounded ground rod.

WARNING

Turn off electrical power at fuse box before making any line voltage connections. Follow local electrical codes.

Set heat anticipator at 0.4 amps for boilers equipped

with standing pilot, and at 0.6 amps for boilers equipped with intermittent ignition. Connect 24 volt thermostat leads to two wires tagged “24 volt thermostat” on boiler. For boilers with 67D-1 ﬂ oat type low water cut-off, two wires are black. One wire is located on secondary of 24 volt transformer, second wire is located on pressure limit control. For boilers with PS-802 probe type low water cut-off, one wire is green and is located on terminal B of PS-802, second wire is black and located on pressure limit control.

ELECTRONIC THERMOSTATS

Certain types of electronic thermostats may lose their memory or shut down. With 67D-1 ﬂ oat type low water cutoffs, this may occur each time thermostat calls for heat, due to internal circuit in vent damper. With PS-802 probe type low water cut off’s, this may occur each time low water cut off detects low water condition. If this is case, isolation relay is required for thermostat circuit. 24 volt single pole single throw (SPST) normally open (N.O.) relay is required, such as Honeywell R8222A or equivalent. Wire as shown in Fig. 10A or Fig. 10B.

VENT DAMPER

Boiler is equipped with factory wired harness with 4 pin molex plug, that plugs into 4 pin molex receptacle inside vent damper operator.

Vent damper must be connected for boiler to operate.

Wiring diagrams follow for various different models.

INSTALL YOUR THERMOSTAT

Thermostat location has important effect on operation of your boiler system. BE SURE TO FOLLOW INSTRUCTIONS INCLUDED WITH YOUR THERMOSTAT.

Locate thermostat about ﬁ ve feet above ﬂ oor on inside wall. It may be mounted directly on wall or on vertically mounted outlet box. It should be sensing average room temperature, avoid following:

DEAD SPOTS: Behind doors Corners and alcoves HOT SPOTS: Concealed pipes

Fireplace TV sets Radios Lamps Direct sunlight Kitchens COLD SPOTS: Concealed pipes or ducts Stairwells - drafts Doors – drafts Unheated rooms on other side of wall

CAUTION

Label all wires prior to disconnection when

servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.

ELECTRICAL WIRING

Figure 10A - Isolation Relay Wiring For Steam Boilers With Float Type Low Water Cut Off And Using An Electronic Thermostat

Figure 10B - Isolation Relay Wiring For Steam Boilers With Probe Type Low Water Cut Off And Using An Electronic Thermostat

ELECTRICAL WIRING

Figure 11 - Wiring Diagrams For Boilers With PS-802 Probe Type Low Water Cut-Off

INTERMITTENT IGNITION

If any of the original wire as supplied with this appliance must be replaced, it must be replaced with type 105°C Thermoplastic wire or its equivalent.

ELECTRICAL WIRING

Figure 12 - Wiring Diagrams For Boilers With PS-802 Probe Type Low Water Cut-Off

STANDING PILOT

If any of the original wire as supplied with this appliance must be replaced, it must be replaced with type 105°C Thermoplastic wire or its equivalent.

ELECTRICAL WIRING

Figure 13 - Wiring Diagrams For Boilers With 67D-1 Float Type Low Water Cut-Off

INTERMITTENT IGNITION

If any of the original wire as supplied with this appliance must be replaced, it must be replaced with type 105°C Thermoplastic wire or its equivalent.

ELECTRICAL WIRING

Figure 14 - Wiring Diagrams For Boilers With 67D-1 Float Type Low Water Cut-Off

STANDING PILOT

If any of the original wire as supplied with this appliance must be replaced, it must be replaced with type 105°C Thermoplastic wire or its equivalent.

CONTROLS AND ACCESSORIES

SAFETY VALVE

The safety valve should open automatically if the boiler steam pressure exceeds the pressure rating of the valve (15 psig). Should it ever fail to open under this condition, shut down your boiler. If valve discharge occurs, or valve fails to open as described above, contact an authorized contractor or qualiﬁ ed service technician to replace the pop safety valve and inspect the heating system to determine the cause, as this may indicate an equipment malfunction.

STEAM PRESSURE GAUGE

Every system should have a pressure gauge installed in the boiler. This gauge enables you to monitor the pressure in the system. If the safety devices fail to shut off your boiler at the proper settings, notify your serviceman immediately.

WATER LEVEL GAUGE

The water level in the boiler can be seen through the glass tube in the water level gauge at side of boiler. Correct cold boiler water level is stamped on side jacket panel. The water level should be checked regularly for the proper level.

On the right side jacket panel of the boiler, there are three holes for the glass water level gauge. The top hole is common for both types of low water cut off, and is used for the upper gauge glass ﬁ tting. The middle hole, 9” down from the top hole, is used for the bottom gauge glass ﬁ tting for the Model 67D-1 and 47-2 ﬂ oat type low water cut off. The lowest hole, 12

/4” down from the top hole, is used for the bottom gauge glass ﬁ tting for the Model PS-802 probe type low water cut off. The hole that is not being used is covered with a sheet metal knockout.

STEAM PRESSURE CONTROL

The steam pressure limit control (pressuretrol) shuts off the gas to the main burners when the steam pressure in the boiler reaches the cut-off setpoint (i.e. the sum of the cut-in and the differential setpoints). Burners reﬁ re when the steam pressure drops to the cut-in setpoint. System pressure requirements are based on the size and condition of the pipes, and the load.

LOW WATER CUT-OFF

1. Model 67D-1

This is a ﬂ oat operated switch which shuts down the gas burner if water falls below the visible bottom of the gauge glass.

2. Model PS-802

This is an electronic probe type LWCO. The probe is located inside the boiler. The LWCO will shut down the burners if the water loses contact with the probe for a period of 10 seconds.

Refer to manufacturer’s instructions (enclosed) for more information.

WATER FEEDER (Optional)

The Model WF-2U-24 water feeder maybe used with either of the available low water cutoffs. The water feeder’s job is to maintain a safe minimum water level. It’s used to keep the boiler running by compensating for minor evaporative steam leaks, and to prevent freeze-ups if the homeowners are away and a return line should spring a leak. McDonnell and Miller Model 101 water feeders may be

used, however the water feed rates are too high and need to be regulated or throttled and wiring will have to be revised. Consult the boiler manufacturer before using these or any other non-standard types of controls.

The automatic water feeder is a safety device, not a convenience item. It is not designed to maintain a “normal” water line. The water feeder does not take the place of a responsible person monitoring and maintaining the normal water line. Steam boilers require personal attention.

VENT DAMPER

This is an automatic, motorized stack damper that has been developed to increase the efﬁ ciency of heating systems by reducing standby losses from the boiler and the conditioned air space. The damper closes the chimney vent when the burner is off and fully opens it when combustion is required.

ROLLOUT SWITCH (FLAME ROLLOUT SAFETY SHUTOFF)

The rollout switch is a temperature-sensitive fuse link device. It is located on the boiler base just outside the ﬁ re box. In the event of heat exchanger ﬂ ueway blockage causing ﬂ ame to roll out of the ﬁ re box, the fuse will blow, shutting down the ﬂ ow of gas to the main burners. The fuse does not change in appearance when blown.

If the rollout switch blows, it must be replaced with an exact replacement. Check heat exchanger ﬂ ueways for blockage when restoring system to operating condition. Do not operate system without a rollout switch.

CONTROLS AND ACCESSORIES

SPILL SWITCH (BLOCKED VENT SAFETY SHUTOFF)

The spill switch is a manual reset disc thermostat with a ﬁ xed setpoint (280° F), and normally closed contacts. It is located at the relief opening of the draft diverter. In the event of chimney or venting system blockage causing products of combustion to spill out of the relief opening, the spill switch disc heats up and the spill switch contacts will open, shutting down the ﬂ ow of gas to the main burners by removing power to the gas valve.

In the event that the spill switch contacts open, the reset button on the back of the switch will pop up. The spill switch must be reset manually, after the switch has cooled off, by pushing the reset button down. Check the venting system and chimney for blockage when restoring the

system to operating condition. DO NOT operate the boiler

without a spill switch.

OPERATING INSTRUCTIONS

For Your Safety Read Before Operating

WARNING

If you do not follow these instructions exactly, a ﬁ re or explosion may result causing property damage, personal injury or loss of life.

Some boilers are equipped with an intermittent ignition A. device which automatically lights the pilot. Do not try

to light the pilot by hand.

Some boilers are equipped with a continuous pilot and must be manually lighted. (See lighting instructions on page 23.) A match holder is included in the parts bag.

BEFORE OPERATING smell all around the appliance B. area for gas. Be sure to smell next to the ﬂ oor because

some gas is heavier than air and will settle on the ﬂ oor.

WHAT TO DO IF YOU SMELL GAS

Do not try to light any appliance.•

Do not touch any electric switch; do not use any phone • in your building.

Use only your hand to push in or turn the gas control C. knob. Never use tools. If the knob will not push in or turn by hand, don’t try to repair it, call a qualiﬁ ed ser- vice technician. Force or attempted repair may result in a ﬁ re or explosion.

Do not use this appliance if any part has been under D. water. Immediately call a qualiﬁ ed service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water.

Immediately call your gas supplier from a neighbor’s • phone. Follow the gas supplier’s instructions.

If you cannot reach your gas supplier, call the ﬁ re • department.

INTERMITTENT IGNITION BOILER - VR8204A/VR8304M GAS VALVE OPERATING INSTRUCTIONS

STOP! Read the safety information on this page.

Set the thermostat to lowest setting.

Turn off all electric power to the appliance.

This appliance is equipped with an ignition device which

automatically lights the pilot. Do not try to light the

pilot by hand.

Remove lower front panel.

Rotate the gas control knob clockwise

to“OFF”.

Wait ﬁ ve (5) minutes to clear out any gas. Then smell

for gas, including near the ﬂ oor. If you smell gas, STOP! Follow “B” in the safety information on this page If you don’t smell gas, go to next step.

Rotate the gas control knob counterclockwise

to “ON.” Replace lower front panel.

Turn on all electric power to the appliance.

10.

Set thermostat to desired setting.

11.

If the appliance will not operate, follow the instructions

12.

“To Turn Off Gas To Appliance” and call your service technician or gas supplier.

TO TURN OFF GAS TO APPLIANCE

Set the thermostat to lowest setting.

Turn off all electric power to the appliance if service is

to be performed. Push in gas control knob slightly and turn clockwise

to “OFF” Do not force.

CONTINUOUS PILOT BOILER - VR8200A/VR8300A GAS VALVE OPERATING INSTRUCTIONS

Figure 15 - Lighting Pilot

Figure 16 - VR8200A /VR8300A Automatic Gas Valve

STOP! Read the safety information on page 22.

Set the thermostat to lowest setting.

Turn off all electric power to the appliance.

Remove lower front panel. Rotate gas control knob slightly and turn clockwise

to “OFF”

Wait ﬁ ve (5) minutes to clear out any gas. Then smell for gas, including near the ﬂ oor. If you smell gas, STOP! Follow “B” in the safety information on page 22 If you don’t smell gas, go to next step.

Find pilot - follow metal tube from gas control. The pilot is between two burner tubes as shown in Fig. 15.

Figure 17 - VR8204A /VR8304A Automatic Gas Valve

10.

11.

12.

13.

TO TURN OFF GAS TO APPLIANCE

Turn knob on gas control counterclockwise “PILOT”

Rotate the gas control knob counterclockwise to “PILOT” Push down and hold the red reset button while you light pilot burner with a match.

After about one minute, release reset button. Pilot should remain lit. If it goes out, turn gas control knob

clockwise to OFF To relight, repeat steps 5-9.

If button does not pop up when released, stop and • immediately call your service technician or gas supplier.

If the pilot will not stay lit after several tries, turn • the gas control knob to “OFF” and call your service technician or gas supplier.

After pilot remains lit when red reset button is released,

turn gas control knob counterclockwise to “ON.” Replace lower front panel. Turn on all electric power to the appliance. Set thermostat to desired setting.

Set the thermostat to lowest setting. Turn off all electric power to the appliance if service is

to be performed. Push in gas control knob slightly and turn clockwise

to “OFF” Do not force.

OPERATING YOUR BURNER

HOW A STEAM SYSTEM OPERATES

The water in the boiler is heated until it reaches the boiling point. As the water boils it turns into steam. The steam rises from the top of the water through the supply main to the radiation units. As it passes through the radiators it releases its heat and condenses into water. The water returns to the boiler through the return main. Most residential sys-

tems operate at less than 1 pound steam pressur

FILLING SYSTEM WITH WATER

On steam heating systems the boiler is partially ﬁ lled with water. It is very important to the proper operation of the entire system that your boiler be ﬁ lled to the proper level. The correct water level is about halfway up the glass water

level gauge as marked on the boiler jacket. To ﬁ ll:

Close the boiler drain valve.

Open the valves at the top and bottom of the glass

water level gauge. Also open the drain valve at the bottom of the gauge.

Open the ﬁ ll valve and allow water to run into the

boiler.

THERMOSTAT

Keep it set at a desired room temperature. If windows are to be opened or heat is not needed, move thermostat pointer to a lower setting.

NOTICE

In the event of failure of any component, the system will not operate or will go into safety lockout. The system is completely self-checking. On every call for heat, each component must be functioning properly to permit operation. On safety lockout the system has to be reset by turning the thermostat to the lowest setting for one minute, then back to the normal setting.

WARNING

Never run water Into a hot empty boiler.

Allow boiler to ﬁ ll until water runs out the gauge drain

valve. Then close the gauge drain valve. Continue to ﬁ ll boiler until water reaches the indicated

water line. This is about halfway up the glass tube.

WATER LEVEL

The normal water level is shown on the right side of the boiler and is 24” above the ﬂ oor. The normal water level is determined when the boiler is off and cold, i.e. when all of the water in the system is inside the boiler and the return piping below the water line, and everything above the water line is air, no steam. When the boiler is making steam, the water level will drop two to three inches below

the normal water line.

AUTOMATIC GAS VALVE

The Automatic Gas Valve opens or closes according to the heat requirements of the thermostat and temperature limit control. It closes if the pilot goes out. Each individual control must be operating correctly before any gas can pass to the burners. Any one control can hold the gas supply from burner regardless of the demand of any other control.

CHECKING AND ADJUSTING

ADJUST PILOT BURNER

Pilot ﬂ ame should surround 3/8” to 1/2” of the pilot sensor. Refer to Fig. 19. If ﬂ ame needs adjusting, do it as follows:

Remove screw cover over pilot adjusting screw.

Insert small screwdriver and adjust ﬂ ame as needed.

Turn screw counterclockwise to increase ﬂ ame, clock- wise to decrease.

Replace screw cover over pilot adjusting screw.

MAIN BURNER(S)

The main burners do not require primary air adjustment and are not equipped with primary air shutters. Main burner ﬂ ames should form sharp blue inner cones in a softer blue outer mantel, with no yellow. Puffs of air from blowing on the ﬂ ame or stamping on the ﬂ oor will cause the ﬂ ames to turn orange momentarily. This is not unusual. Remain still when observing the main burner ﬂ ames. If the ﬂ ame appearance is not correct, check main burner oriﬁ ces and the burner throat and ﬂ ame ports for dust and lint obstruc- tion. It may be necessary to remove the rollout shield to observe the main burner ﬂ ames. Replace rollout shield after observation. Refer to Figure 18.

Figure 18 - Main Burner

GAS VALVE SAFETY SHUTDOWN TEST

Ignition System Safety Shutoff device must be tested after placing boiler in operation.

For boilers equipped with continuous pilot, with main

burners ﬁ ring, disconnect the thermocouple from the gas valve. The gas valve should immediately shut off the main burners and the pilot.

For boilers equipped with intermittent ignition, with

main burners ﬁ ring, disconnect the ignition cable from the intermittent pilot control box. The gas valve should shut off the main burners. TURN OFF ELECTRIC POWER to boiler before reconnecting ignition cable, to prevent electric shock.

ADJUST STEAM PRESSURE CONTROL

of the pipes, and the load. For good system operation, the cut-in setting of the pres-

suretrol should never be less than twice the system pressure drop. In a typical single family residence with a clean one pipe heating system and cast iron radiation, this means that the cut-in will usually be set at the minimum setting, i.e. 1/2 psi.

Steam radiation is usually sized based on square feet of equivalent direct radiation (EDR). This is based on a steam pressure in the radiator of just less than 1 psi. Therefore, in our example system from above, we would set the differential adjustment at 1 psi, i.e. the steam pressure required in the radiators. This will give us a cut-off setpoint of 1-1/2 psi.

The above is an example of a typical one pipe system. For larger systems or other types of systems such as two pipe systems, or systems with convectors or fan coil units, the pressuretrol settings will need to be determined on a system-by-system basis.

The cut-in setpoint is determined by the system pressure drop to the furthest radiator or terminal unit. Double the system pressure drop as a safety factor, resulting in the rule that the cut-in setting should never be less than twice the system pressure drop.

The differential setpoint is the steam pressure required at the terminal heating units.

Now your boiler will operate in the correct pressure range. It will maintain enough steam pressure to send the steam out to the furthest radiator, and not go over the optimum steam pressure that is required at the radiators.

CHECKING CONTROLS

To check the Low Water Cut-Off, turn off power to the boiler or turn the thermostat down to the lowest setting. Drain water to below the visible bottom of the water gauge glass. Turn power on and turn the thermostat to call for heat. When the boiler is equipped with the ﬂ oat type LWCO the gas valve should not open on a call for heat when the water is low. When the boiler is equipped with a probe type LWCO the gas control should be powered for approximately 10 seconds (the time delay on the probe type LWCO), then the gas valve will close and the red indicator will illuminate on the LWCO.

CHECKING AND ADJUSTING

If your boiler is equipped with the optional WF-2U-24 water feeder, continue to keep the thermostat calling for heat after the low water cut off recognizes the low water condition. After a one minute time delay, the water feeder should start feeding water to the boiler. The feeder should feed for one minute, and then go into another one minute waiting period. This cycle of alternately waiting and feeding should repeat until:

For Model 67D-1 ﬂ oat type low water cutoffs water level raises the ﬂ oat above the burner cut off switch level, the burners should ignite. The water feeder remains powered until the water level raises the ﬂ oat to the water feeder switch level, satisfying the water feeder.

For Model PS-802 probe type low water cutoffs

water level will rise until water in the boiler makes contact with the probe, satisfying the water feeder, and igniting the burners.

In either case, there should be between one and two inches of water visible in the gauge glass when both the water feeder is satisﬁ ed, and the burners are allowed to ignite.

The time delays in the feed cycles are designed to prevent the boiler from ﬂ ooding due to slow return lines.

To check the pressure limit, run the boiler until the pressure reaches system demand. Then turn the pressure screw and drop the pressure setting until the boiler shuts down. This will show that the pressure limit is operating properly.

Refer to control manufacturer’s instructions (enclosed) for more information.

Check thermostat operation. When set above temperature indicated on the thermometer, boiler should ignite. Make certain the thermostat turns off the boiler when room temperature reaches the selected setting and starts the boiler operating when room temperature falls a few degrees.

Finally, set the thermostat for the desired temperature. Special conditions in your home and the location of the thermostat will govern this setting.

- as the

- the

Figure 19 - Igniter

CLEANING YOUR BOILER

It is very important to clean a new steam boiler after it has been installed and put into continuous operation. This must be done to remove any accumulation of oil, grease, sludge, etc., that may have been present in the system. These substances may cause the boiler water to foam and surge, thus producing a very unsteady water line, throwing water into the steam header, and possibly preventing steam generation. Follow these steps in order to remove these contaminants.

SKIMMING AND SLOWDOWN

New boilers must be skimmed at the time of installation to remove threading oil and other impurities that ﬂ oat on the surface of the water.

Remove the plug from the skimmer tapping and pipe to a ﬂ oor drain or bucket.

Raise the water level to the skimmer tapping.

Fire the boiler to maintain a water temperature of 180-

200 degrees. Feed water to the boiler to maintain the water level.

Adjust the water feed rate to keep water continuously ﬂ owing out of the skimmer tapping without the water level going above or falling below the tapping. Cycle

the burners to prevent boiling. Continue skimming until the water runs clear. This may

take several hours. Float type low water cutoffs must be blown down after

skimming. The ﬂ oat chamber of the low water cut off must be ﬂ ushed clean and maintained clear of sediment to allow free movement of the ﬂ oat. This must be done frequently during initial operation of the boiler, and at least once a week thereafter. Follow the instructions on the tag attached to the control. Probe type low water cutoffs require no maintenance at this time.

After blowing down the low water cut off and before

blowing down the boiler, ﬁ ll the boiler to the water line. Fire the burners and allow normal steam pressure to build up. Run a connection from the boiler blowdown valve to a nearby sewer or ﬂ oor drain or to a safe discharge point outside. Shut off the gas burners, open the blowdown valve, and allow all of the water in the boiler to drain out. Close the blowdown valve. Allow the boiler to cool thoroughly, and then slowly reﬁ ll the boiler to the water line. Repeat this step as many times as necessary until the blowdown water is clear.

Following the ﬁ nal blow down, allow the boiler to thor-

oughly cool, and then add fresh water slowly up to the normal water line. Start the burners and maintain at least 180 degrees for 15 minutes to remove dissolved gasses from the fresh water. Shut off burners

Now, let the boiler steam for a few days, to give the majority of the system dirt a chance to work its way back to the boiler. Then check the water in the gauge glass. The gauge glass should be dry above the water line. The water line should not bounce more than one inch when the boiler is steaming. If you see water droplets carrying over from the top of the gauge glass, or excessive bouncing of the water line, the boiler needs further cleaning. Take a water sample and boil it on the stove, to see if it foams. If it does, this also indicates the boiler needs to be cleaned.

If cleaning is necessary, repeat the skimming and blow down procedure from above. Usually, a long skim will be all you need to clean the boiler.

In more troublesome cases it may be desirable to ﬂ ush the system as well. This is accomplished by closing the gate valve in the Hartford Loop, and opening the drain(s) at the end of the wet return(s). Run a hose from the drain valve on the wet return to a nearby ﬂ oor drain or bucket. Run the boiler at two pounds of steam pressure. Feed just enough water to compensate for the waste condensate going down the drain, and to keep the boiler from going off on low water cut off. Run the boiler until all waste condensate runs clear.

In very extreme cases it may be necessary to chemically clean and ﬂ ush the heating system. Consult the boiler manufacturer before introducing any chemicals into the boiler.

NOTICE

Boiler cleaners and chemical cleaning additives are not recommended. If used and not rinsed properly, they will do more harm than good. The cleaning procedures laid out above will clean out the typical oils and impurities found in new boilers and in residential heating systems. The best thing for your boiler and heating system is clean water with no additives.

MAINTAINING YOUR BOILER

Keep boiler area clear and free from combustible materials, gasoline and other ﬂ ammable vapors and liquids. Keep boiler are clear and free of obstructions to ﬂ ow of combustion and ventilation air.

Check the water level every day or two. Verify the water line shown by operating the drain valve on the gauge. BE SURE TOP AND BOTTOM VALVES ON GAUGE ARE ALWAYS OPEN SO THAT ACTUAL WATER LEVEL WILL BE SHOWN AT ALL TIMES.

The gauge glass should be dry above the water line. The water line should not bounce more than about one inch when the boiler is steaming. If you see water droplets carrying over through the top of the gauge glass, or excessive bouncing of the water line, the boiler needs to be cleaned. Follow the instructions under “Cleaning Your Boiler.”

SAFETY VALVE

Before testing, make certain discharge pipe is properly connected to valve outlet and arranged to contain and safely dispose of boiler discharge. Under normal operating conditions a “try lever test” must be performed every month. A “try lever test” must also be performed at the end of any non-service period. Test at normal system operating pressure by holding the test lever fully open for at least ﬁ ve seconds to ﬂ ush the valve seat free of sediment and debris. Then release lever and permit the valve to snap shut. If lift lever does not activate, or there is no evidence of discharge, turn off boiler immediately and contact a licensed contractor or qualiﬁ ed service personnel.

NOTE: Opening blow-off valve checks cut-off operation

too. As ﬂ oat drops with falling water level, burners will shut off. After valve is closed and normal operating conditions are restored, burners will resume ﬁ ring. For probe type Low Water Cutoffs, check action of the Low Water Cut-Off monthly to make sure it is providing the proper protection. See “Checking and Adjusting” on page 19. Low Water CutOff remote probes must be removed for periodic inspection and cleaning, preferably at the beginning of each heating season. More frequent cleaning may be required on boilers requiring constant or very frequent additions of make up water.

BURNERS

A visual check of the pilot and main burner ﬂ ames should be made at least once each year, preferably at the beginning of the heating season. See page 19.

BOILER FLUE PASSAGES

Under normal operating conditions, with the burners properly adjusted, it should not be necessary to clean the boiler ﬂ ue gas passages. However, to assure trouble-free operation, we recommend that you have the ﬂ ue passages, burner adjustment,

and operation of the controls checked once each year by a competent Service Technician.

Before the start of each season (or whenever system has been shut down for some time) recheck the whole system for leaks . . . and recheck the boiler and vent pipe for leaks.

LOW WATER CUT-OFF

The Low Water Cut-Off will interrupt the electrical current to the burner when the water line in the boiler drops to a low level.

On ﬂ oat type low water cutoffs, it is very important to keep the ﬂ oat chamber free from sediment, a condition essential to dependability. To keep any accumulation from interfering with ﬂ oat action is to “BLOW DOWN” or ﬂ ush out the control regularly. This must be done two to three times during the ﬁ rst week after installation and once a week thereafter during the heating season. Do it while the boiler is in operation. First note water level in gauge glass. Open blow-off valve at bottom of control; water will pour out, ﬂ ushing away sediment. Drain until water is clear, about a pailful, then close valve. If water level in gauge glass has dropped, add water to boiler to restore level. Consult low water cut-off manufacturer’s instructions included with boiler.

VENT PIPE

The venting of this unit is very important and the piping should be checked at least once a season. If the vent piping shows any sign of leaking, replace it immediately.

CLEANING YOUR BOILER FLUE PASSAGES AND BURNERS

Flue Passages between sections should be examined yearly and cleaned, if necessary. To clean, remove burners, pilot, and vent pipe. Remove top and front jacket panels. Remove the two screws attaching the intermediate front panel to the left and right side jacket panels. Remove the draft diverter and intermediate front panel as a unit. Carefully remove the cerafelt gasket strips. Clean passageways between sections with a ﬂ exible handle wire brush. Remove dirt from bottom of boiler and from between sections by vacuuming. Make sure all ﬂ ame ports in burners are open and clear. Shake out or blow out all loose dirt in burners. Reseal seams between adjacent sections as necessary with 400F RTV silicone sealant. Reassemble all parts. Be sure to check tightness of pilot connections and condition of burner ﬂ ames after reassembly (see Figures 18 and 19).

Be sure vent pipe connections to chimney are secure and no obstructions are present.

MAINTAINING YOUR BOILER

FOAMING, PRIMING OR SURGING

These terms are used to describe a ﬂ uctuating water line - when water leaves the boiler with the steam.

It is caused by any combination of the following:

Threading oil and organic matter in the boiler water.

(Mineral oil, or core sand does not cause surging.) Follow instructions under “Cleaning Your Boiler.”

Faulty quick vents that do not release air until a

sizeable pressure is built up - if old style, replace - if dirty, clean so you can easily blow through valve.

Improper header design - when steam ﬂ ows in opposite

direction of equalizer line on “Hartford Loop.” Generally a 15” horizontal run between riser and main takeoff will allow entrained water to fall out of the steam vapor so it can return to boiler. (See Figures 2, 3A & 3B on pages 7 and 8).

Adjustment of steam limit control to a wide differential

increases difﬁ culty if quick vents are old style, slow- releasing type or dirty. Always set steam limit control differential as low as possible.

Soap and detergents in the boiler water cause extreme

surging. Boiler cleaners and chemical cleaning additives are not recommended. If used and not rinsed properly, they will do more harm than good. The cleaning procedures laid out in these instructions will clean out the typical oils and impurities found in new boilers and in residential heating systems. The best thing for your boiler and heating system is clean water with no additives.

BOILER WATER TREATMENT (Other Than Cleaners) In

steam systems where the system is tight, free from leaks, and all the steam is returned to the boiler as condensate, the amount of make up water is small. Water treatment is generally not required.

In steam systems with less than 90% of the steam being returned as condensate, or with very hard or corrosive make up water, treatment may be desirable. Follow the recommendations of your local boiler water treatment specialist.

BETWEEN HEATING SEASONS

Boilers should not be drained between heating seasons. Steam boilers should be entirely ﬁ lled with water during the summer months to exclude air.

CAUTION

Never reﬁ ll a hot boiler with cold water - the danger of thermal shock may crack a section.

SERVICE HINTS

You may avoid inconvenience and service calls by checking these points before you call for service.

FOR YOUR SAFETY

WHAT TO DO IF YOU SMELL GAS

1. Do Not try to light any appliance.

2. Do not touch any electric switch, do not use the phone.

3. Leave the building immediately, then call your gas supplier.

4. If you cannot reach the gas supplier, call the ﬁ re department.

IF YOUR SYSTEM IS NOT HEATING OR NOT GIVING ENOUGH HEAT . . .

Possible Cause What to do

Thermostat is not set correctly Reset thermostat above room temperature.

Check ﬂ ame. If it is yellow, the burner is not getting enough air.

Burner is not operating properly

No electric power to boiler

Controls out of adjustment

Radiators not heating

Poor electrical contact

Or, if ﬂ ame is blue and noisy and seems to lift off the burner, the burner is getting too mush air. Contact your service technician

Check over current protection. Check to be sure electric power supply circuit is “ON”.

Reset according to instructions.

Steam air vents not operting properly. Check ﬂ ow control valve (if used) - may be in closed position.

Check all control terminals and wire joints.

Rollout switch blown

Chimney ﬂ ue is blocked

Vent damper not operating

Have your service technician check heat exchanger for blockage.

Spill switch contacts open, requiring manual reset of spill switch. Have your service technician check and correct chimney problem.

Consult troubleshooting guide, packaged with vent damper.

IF BURNER IS NOISY . . .

Gas input amount is incorrect Contact your service technician.

IF WALLS OR WINDOWS SWEAT . . .

Not enough ventilation Contact your service technician

Chimney ﬂ ue is blocked Have your service technician check and correct, if necessary

IF RADIATORS ARE NOISY . . .

Air in system refer to "Radiators Not Heating" above

SAFETY VALVE LEAKING . . .

Dirt on seat Open valve manually. Allow steam to blow and clear valve seat.

HAVE YOUR SERVICE TECHNICIAN CHECK ANY PROBLEM YOU ARE UNABLE TO CORRECT.

REPAIR PARTS

Date Service Performed Company Name & Tech Initials Company Address & Phone #

PRODUCT LITERATURE

Lennox Industries Inc.

Dallas, Texas

Lennox International Inc. GSB8-E, GSB8-S User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual