Harsco Industrial 1004905923, MODU-FIRE 2500, MODU-FIRE 3000 Installation & Owner's Manual

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MODU-FIRE® FD 2500-3000 Rev. 1.01 (2/7/12)

MODU-FIRE® FORCED DRAFT GAS-FIRED BOILER 2500 - 3000

C.S.A. Design-Certified Complies with ANSI Z21.13/CSA 4.9 Gas-Fired Low Pressure Steam and Hot Water Boilers

ASME Code, Section IV Certified by Harsco Industrial, Patterson-Kelley

C.S.A. Design-Certified Complies with ANSI Z21.13/CSA 4.9 Gas-Fired Low Pressure Steam and Hot Water Boilers

Model #:_______ Serial #______________________

Start-Up Date: _______________________

Harsco Industrial, Patterson-Kelley 100 Burson Street East Stroudsburg, PA 18301 Telephone: (570) 476-7261 Facsimile: (570) 476-7247 www.harscopk.com

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

1 INTRODUCTION .........................................................................................................5

2 SAFETY .......................................................................................................................5

2.1 General ............................................................................................................................ 5

2.2 Training ............................................................................................................................ 5

2.3 Safety Features ................................................................................................................ 6

2.4 Safety Labels ................................................................................................................... 6

2.5 Safety Precautions ........................................................................................................... 6

3 INSTALLATION ...........................................................................................................8

3.1 Receiving and Storage ..................................................................................................... 8

3.2 Compliance with Codes ................................................................................................... 9

3.3 Setup ................................................................................................................................ 9

3.4 Electrical Connections.................................................................................................... 10

3.5 Inlet Air and Exhaust Venting ......................................................................................... 12

3.6 Gas Piping ...................................................................................................................... 21

3.7 Boiler Water Piping ........................................................................................................ 23

3.8 Burner and Ignition System ............................................................................................ 26

3.9 Pre-Start Check List ....................................................................................................... 26

3.10 Safety Checks ............................................................................................................. 26

3.11 Boiler Operating Control ............................................................................................. 28

3.12 Combustion Adjustment .............................................................................................. 29

4 OPERATION ..............................................................................................................32

4.1 General .......................................................................................................................... 32

4.2 Lighting and Shut-Down Procedures ............................................................................. 32

5 MAINTENANCE .........................................................................................................33

5.1 Maintenance and Inspection Schedule .......................................................................... 33

5.2 Cleaning the Burner ....................................................................................................... 35

5.3 Removing the Heat Exchanger ...................................................................................... 36

5.4 After All Repairs or Maintenance ................................................................................... 36

5.5 Sequence of Operation .................................................................................................. 36

5.6 Troubleshooting ............................................................................................................. 37

5.7 Manual Reset Error Codes – A## .................................................................................. 40

5.8 Auto-reset Error Codes – E## ........................................................................................ 41

6 PARTS/TECHNICAL SUPPORT ...............................................................................42

6.1 Schematic Diagrams ...................................................................................................... 42

7 LIMITED WARRANTY ...............................................................................................54

8 MODU-FIRE

FORCED DRAFT BOILER FIRE TEST REPORT ..............................55

WARNING

Improper use may result in fire or injury.

Read instructions/safety manual before installing,

1998 HCS, Inc. 800-748-0241

operating or servicing boiler.

Reorder No. 6020-V2WHPK

If the information in this manual is not followed exactly, a fire or explosion may result

causing property damage, personal injury or loss of life.

Do not store or use gasoline or other flammable vapors or liquids in the vicinity of this or any other appliance.

Installation and service must be performed by a qualified installer, service agency, or the gas supplier.

It is essential to read, understand, and follow the recommendations of this manual

before installing, operating, or servicing this equipment.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Installation and service must be performed by a qualified and knowledgeable individual who has been trained on the Harsco Industrial, Patterson-Kelley MODU-FIRE® Forced Draft boiler. The same features which permit this boiler to achieve high-efficiency performance make it unlike most other boilers of this general size, so it is important to understand how this boiler operates.

What to do if you smell gas:

 Do not try to light any appliance.  Do not touch any electrical switch; do not use any phone in your building.  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 fire department.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

1 INTRODUCTION

The MODU-FIRE® Forced Draft gas-fired boiler is a revolutionary advance. Harsco Industrial, Patterson-Kelley now combines full-modulation burner control and forced draft advances with our time-tested modular hot water boiler design. The result is a full-modulation boiler utilizing reduced vent sizing for installation and cost efficiencies. This boiler combines the best of our earlier designs with a new generation of burner, control and operating technology. You will achieve high part-load efficiencies – but without the complexity you might expect in this type of high performance boiler. It is high performance made simple and dependable for years of troublefree operation.

This manual covers installation and operation of the MODU-FIRE model numbers may include a prefix to indicate special features or different options. While details may differ slightly, basic operation is the same for all models. Boilers are built to operate with natural gas or propane. Check the rating label for the correct gas type and flow rate.

The boiler is only a part of the complete heating system. This boiler may be fully operational and yet, because of poor circulation, controls, or other operating characteristics, not deliver heat to the desired location. Additional equipment such as temperature sensors, pumps, flow switches, balancing valves and check valves will be required for satisfactory operation of any system. Harsco Industrial, Patterson-Kelley cannot be responsible for the design or operation of such systems and a qualified engineer or contractor must be consulted.

Forced Draft 2500 & 3000 MFD boiler. The

2 SAFETY

2.1 GENERAL The MODU-FIRE® Forced Draft gas-fired boiler must be:

 Installed in accordance with designs prepared by qualified facility engineers including: structural,

mechanical, electrical, and other applicable disciplines.

 Operated and serviced in accordance with a comprehensive safety program determined and established by

the customer. Do not attempt to operate or service the unit until such a program has been established.

 Operated and serviced by qualified and knowledgeable personnel in accordance with all applicable codes,

laws, and regulations.

 The use of the term “factory-trained personnel” throughout this manual indicates Harsco Industrial, Patterson-

Kelley trained on this specific piece of equipment.

2.2 T

It is essential to read, understand, and follow the recommendations of this manual before installing, operating, or servicing this equipment. Failure to do so could result in serious injury, death, and/or property damage.

RAINING

Proper training is the best protection against accidents. Operating and service personnel must be thoroughly familiar with the basic construction of the MODU-FIRE the operation of the boiler, adjustment of its various mechanisms, and all applicable safety precautions. If any of

Forced Draft boiler, the use and locations of the controls,

the provisions of this manual are not fully and completely understood, contact the Harsco Industrial, PattersonKelley Technical Services Department at (877) 728-5351.

2.3 S

It is the responsibility of the customer to maintain the safety features of this machine, such as: guards, safety labels, safety controls, interlocks, lockout devices.

2.4 S

The following words are used in this manual to denote the degree of seriousness of the individual hazards.

AFETY FEATURES

AFETY LABELS

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

indicates an imminently hazardous situation which, if not avoided, will result

in death or serious injury. This signal word is to be limited to the most extreme situations.

indicates a potentially hazardous situation which, if not avoided, could re-

sult in death or serious injury.

indicates a potentially hazardous situation which, if not avoided, may result

in minor or moderate injury. It may also be used to alert against unsafe practices.

NOTICE/NOTE - NOTICE is the preferred signal word to address practices not related to personal injury. The safety alert symbol is not used with this signal word.

The safety labels shown below are affixed to the boiler and dual language labels may also be affixed to the boiler. Although the labels are of high quality, they may become dislodged or unreadable over time. Contact Harsco Industrial, Patterson-Kelley for replacement labels.

2.5 S

Provide a suitable location for the boiler, away from normal personnel traffic, with adequate working space, adequate clearances, proper ventilation and lighting, with a structure sufficiently strong and rigid to support the weight of the boiler, all piping and accessories.

2.5.1 Electrical Hazards

AFETY PRECAUTIONS

 Shock hazard! Properly lockout/tagout the electrical

service and all other energy sources before working on or near the machine.

 Shock hazard! Boiler is not rated for wash-down service.  Power down unit for at least 10 minutes before servicing

the blower.

2.5.2 Burn, Fire, and Explosion Hazards

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

NOTE

Make sure this union is tight before closing cabinet cover after servicing boiler.

1998 HCS, Inc. 800-748-0241

Reorder No. 8032-02NHAK

NOTE

When opening leak test valves, always follow instructions in operation and safety manual.

1998 HCS, Inc. 800-748-0241

Reorder No. 8032-01NHPK

1998 HCS, Inc. 800-748-0241

WARNING

Im p rop er use m a y result in fire or injury.

Read instructions/safety manual before installing,

operating or servicing boiler.

Re or de r No. 6020- V2 WH PK

 Burn, fire, and explosion hazards! Installation must be in strict conformance to all applicable codes and

standards including NFPA 54/ANSI Z223.1 and/or CAN/CSA- B149.1.

 Hazard from incorrect fuels! Possible fire, explosion, overheating, and damage. Do not use any fuels except

the design fuel for the unit.

 Overfire hazards! High pressure in gas or propane supply could result in overfiring of other devices supplied

from the same source.

 Fire and explosion hazards! Close the main gas shutoff before servicing boiler.

 Fire and explosion hazards! Do not store or use gasoline or other flammable vapors or liquids in the vicinity

of this or any other gas fired appliance.

 Burn hazard! Possible hot surfaces. Do not touch the stack during firing operations. Use only factory

recommended vent components.

 Burn hazard! Hot fluids. Use caution. Allow boiler to cool before servicing or draining boiler.

 Fire and explosion hazards! Use caution when servicing burner or heat exchanger. Unburned fuel may linger

in the combustion chamber, vent lines, or elsewhere.

 Gas leak hazard! Make sure all connections to main burner are tight when reassembling the burner.

 Gas leak hazard! All threaded gas connections must be made using a pipe compound that is resistant to

liquefied petroleum. Do not use Teflon tape on threaded gas piping.

 Gas leak hazard! Check entire gas train for leaks after installation. If there is a smell of gas, shut down the

boiler, close all gas valves and obtain immediate assistance from factory-trained personnel and/or your local fire department.

 Overfire hazard! Possible fire and explosion from excess gas pressure. Make sure that gas inlet pressure

does not exceed 14 inches W.C. to the boiler main gas valve.

 Overfire hazard! Possible fire and explosion. Possible malfunction of regulators and/or gas valves.

Maintain all gas train components in good condition. Do not alter wiring connections. Annual inspection by factory-trained personnel for proper set-up and operation is recommended.

 Overfire and underfire hazards! Possible fire, explosion, overheating, and component failure. Do not attempt

to adjust firing rate of the boiler. The firing rate must be adjusted only by factory-trained personnel.

2.5.3 Crush Hazards

 Lifting hazards! Use properly rated lifting equipment to lift and position the boiler. The load is

unbalanced. Test balance before lifting more than 3 ft. above the floor. Do not allow personnel beneath the lifted load. The approximate weight of the N2500 & N3000 MFD is 1200 lbs.

General Warning

 Bump hazard from overhead piping. Install piping with adequate vertical clearance.

2.5.4 Chemical Hazards

 Chemical hazards from cleaning products. Use caution when cleaning the system. The use

of professional assistance is recommended. Use safe procedures for the disposal of all cleaning solutions.

General Warning

2.5.5 Pressure Hazards

 Pressure hazard! Hot fluids. Install isolation valves on boiler water inlet and outlet. Make

sure isolation valves are closed before servicing boiler.

 Pressure hazard! Hot fluids. Test safety relief valve every 30 days during the heating season

and after any prolonged period of inactivity. Do not operate boiler with faulty relief valve.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

General Warning

2.5.5 General Hazards

 Tripping hazard! Do not install piping on floor surfaces. Maintain clear path around boiler.  Slip and fall hazard! Use drip pan to catch water while draining the boiler. Maintain dry floor

surfaces.

 Slip and fall hazard! Through-the-wall vents shall not terminate over public walkways or over

an area where condensate or vapor could create a nuisance or hazard.

General Warning

 Fall hazard! Do not stand on any part of the boiler.  Catch hazard! Do not wear rings, jewelry, long hair, loose clothing while working on the

boiler.

3 INSTALLATION

Installation and service must be performed by a qualified installer, service agency,

or gas supplier.

3.1 R

3.1.1 Initial Inspection Upon receiving the boiler, inspect it for signs of shipping damage.

recommend unpacking the boiler, removing the top, front, and side covers and inspect the boiler. Verify that the total number of pieces shown on the packing slip agrees with those actually received.

ECEIVING AND STORAGE

Since some damage may be hidden, we

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

NOTICE! Note any damage, suspected potential damage, or shortage of materials on the freight bill and immediately notify the carrier. File all claims for shortage or damage with the carrier. Claims for hidden damages must be filed with your carrier within 7 days. The boiler carton is equipped with a “Tip (N) Tell”. If "Tip (N) Tell” arrow point is blue, that indicates that the package has been on its side or tipped over in transit.

3.1.2 Storage Prior to Installation

If the boiler is not installed immediately, it must be stored in a location adequately protected from the weather, preferably indoors. If this is not possible, then it should remain in the shipping container and be covered by a tarpaulin or other waterproof covering.

NOTICE! Controls and other equipment that are damaged or fail due to weather exposure are not covered by warranty.

3.2 C

The MODU-FIRE® Forced Draft boiler with standard components and many options complies with American National Standard/CSA Standard ANSI Z21.13/CSA 4.9, latest edition. The heat exchanger is constructed and stamped in accordance with ASME Boiler and Pressure Vessel Code, Section IV for 160 psig maximum operating pressure and 250º F maximum operating temperature. Other codes or approvals which apply will be labeled on the boiler.

OMPLIANCE WITH CODES

Installation of the boiler must conform to all the requirements of all national, state and local codes established by the authorities having jurisdiction or, in the absence of such requirements, in the U.S. to the National Fuel Gas Code, NFPA 54/ANSI Z223.1., latest edition, and the specific instructions in this manual. In Canada, the equipment shall be installed in accordance with the current Installation Code for Gas Burning Appliances and Equipment, CAN/CSA-B149.1, and applicable Provincial Regulations for the class which should be carefully followed in all cases. Authorities having jurisdiction should be consulted before installations are made.

Where required by local codes, the installation must conform to American Society of Mechanical Engineers Safety Code for Controls and Safety Devices for Automatically Fired Boilers (ASME CSD-1).

In the Commonwealth of Massachusetts, see Massachusetts Installation & Owner’s Manual Supplement.

3.3 S

3.3.1 Foundation

Provide a firm, level foundation, preferably of concrete. NOTICE! The boiler may be installed on a combustible floor; however, the boiler must never be installed on

carpeting.

NOTICE! This boiler is certified for indoor installation only.

3.3.2 Placement

The boiler must be level and upright to function properly. Use shims or other approved structural devices to properly level boiler.

ETUP

3.3.3 Installation Clearances

If the boiler is to be installed near combustible surfaces, six (6”) inches minimum clearance to the combustible surface must be maintained.

Failure to provide for the service access clearances, even with non-combustible surfaces, may cause future problems servicing the boiler.

The boiler must be installed in a space large in comparison to the boiler as described in the National Fuel Gas Code, NFPA 54/ANSI Z223.1, Latest Edition.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Clearances from Adjacent Walls, Ceiling, and Obstructions Side Clearances for a Row of Boilers

Type of Surface Dimensions (inches)

CSA Minimum Clearances to Combustibles

Recommended Service Clearances

A B C† D

24 24* 24 24

30 24* 24 24**

boiler or row of boilers. Boilers may be installed immediately adjacent to each other. However, Harsco Industrial, Patterson-Kelley recommends this clearance between each boiler when there is insufficient access at the rear to allow for service and adjustment.

3.4 E

All field wiring connections for power and controls are in the junction box on the back of the boiler. The boiler wiring label is attached to the inside front door of the boiler. An external electrical disconnect (not supplied with the boiler) with adequate overload protection is required. The boiler must be grounded in accordance with local codes or in the absence of such requirements, in the U.S. with National Electrical Codes, ANSI/NFPA No. 70 latest edition and in Canada, wire

Electrical

according to the current Canadian Electrical Code.

LECTRICAL CONNECTIONS

Connections

† "C" dimension includes clearance to remove the burner and installation of the air inlet duct. Do not put pipes, other ducts, equipment, etc. above the boiler.

* CSA minimum. Actual clearance depends upon venting requirements.

** Service access need be only on one side of a

NOTICE! A dedicated earth ground (green wire) is required to avoid nuisance shutdowns. Do not ground through the conduit. It is also important that proper polarity be maintained.

The junction box at the rear of the boiler contains terminal strips for all customer connections. A detailed schematic of the connections is shown in 6.1.7. These connections are described as follows:

High Voltage (HV) Terminal Block

The boiler power circuit requires 208-240 volts, single phase, 60 hertz, with a dedicated neutral and ground for the control circuit as labeled. The voltage from each line (L1, L2) to the neutral must be approximately 120V AC. Electrical service must be rated for 17 amps minimum. Before starting the boiler, check to ensure that the proper voltage and amperage are connected to the boiler and that the boiler is connected to a suitable fused disconnect switch or circuit breaker. There must be less than 1.0V from Neutral (HV-3) to Ground (HV-10)

120VAC Switched Output- This contact closes when the boiler is switched on. This provides 120VAC 5Amp service to HV12 and HV13. The neutral for this circuit is provided on HV4 and HV5. When the boiler is switched off, these terminals are switched off as well.

3 Way Valve- This output is normally energized, keeping the three way valve providing heat to the building. The Domestic Hot Water (DHW) call for heat de-energizes this circuit, causing the 3 way valve to self close, thereby providing heat to the DHW loop. This output provides 120VAC 0.5Amp service to HV14. The neutral for this circuit is provided on HV 6.

DHW Pump Relay w/Delay Off - This output is enabled when there is a call for DHW. When the call for heat is removed, the output remains enabled for a period of time. This output provides 120VAC 0.5Amp service to HV15. The neutral for this circuit is provided on HV 7.

Circ Pump Relay w/Delay Off - This output is enabled when there is a call for heat. When the call for heat is removed, the output remains enabled for a period of time. This output provides 120VAC 0.5Amp service to HV16. The neutral for this circuit is provided on HV 8.

Damper Relay - This output is enabled when the call for heat is enabled. This output provides 120VAC service to HV17. The neutral for this circuit is provided on HV 9. This circuit is for pilot duty only.

Master Alarm Relay – This contact closes in the event of an alarm output from the boiler control, connecting HV18 and HV19.

Flame Detected Relay – This contact closes whenever the boiler is firing, connecting HV20 and HV21. Low Voltage (LV) Strip Enable/Disable– Use for boiler enable. Closing this circuit allows the boiler to run. Opening this circuit prevents

the boiler from running, provided the remote/local enable switch is in the remote position. This circuit is energized by the boiler. It has a 24VAC potential. Devices connected to these terminals must be rated for 24VAC

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

The remote/local switch bypasses the Enable/Disable (LV1 to LV2) when in the local

position. Do not connect safety devices into the Enable/Disable circuit.

Auxiliary Low Water Cutoff – These terminals are used for connection of a secondary low water cutoff used in the system. This circuit is energized by the boiler. It has a 5V potential. Devices connected to these terminals must be rated for 5V.

External Interlock - Use for attachment of an additional field safety device to the boiler control circuit. Closing this circuit allows the boiler to run. Opening this circuit prevents the boiler from running. This circuit is energized by the boiler with a 5V potential. Devices connected to these terminals must be rated for 5V.

Outdoor Temp Sensor – LV7 and LV8 are connected to the outdoor temperature sensor. The temperature control must be programmed to run an outdoor air schedule. The outdoor air sensor and programming help are available from the local Harsco Industrial, Patterson-Kelley Representative. This circuit is energized by the boiler with a 5V potential. The temperature sensor must be a NTC having 12k@25°C.

DHW Stat/Sensor – LV9 and LV10 are connected to the DHW temperature sensor or thermostat. This circuit is energized by the boiler with a 5V potential. The temperature sensor must be a NTC having 12k@25°C.

Header Temp Sensor – LV11 and LV12 are connected to the header temperature sensor. This circuit is energized by the boiler with a 5V potential. The temperature sensor must be a NTC having 12k@25°C.

DHW Flow Switch – LV13 is energized by the boiler with a 5V potential. This circuit connects through a flow switch on the domestic side of a domestic hot water system. The flow switch should close upon flow to provide a closed circuit back to LV14.

Analog Input– Remote signal for controlling the boiler. The boiler can be operated in a remote setpoint or a remote firing rate control mode. Input 0-10VDC signal only. The temperature control must be programmed to run with the analog input.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

MODBUS

– LV19 and LV20 are used for connecting a MODBUS® building management system. (See the ENVI®

Control Advanced Users Guide for more information) Cascade – LV21 and LV22 are used to connect between boilers that are part of a Master/Member Network. Up to

24 boilers may be connected together. (See the ENVI

Control Advanced Users Guide for more information)

3.5 I

NLET AIR AND EXHAUST VENTING

3.5.1 Applicable Codes & Standards CODES

United States: NFPA 54/ANSI Z223.1 National Fuel Gas Code NFPA/ANSI 211 Chimneys, Fireplaces, Vents and Solid Fuel Burning Appliances

Canada CAN/CSA B149.1 Installation Codes for Gas Burning Equipment

STANDARDS

UL 1738 Venting Systems for Gas-Burning Appliances, Categories II, III, and IV

These codes and standards contain information for the venting of gas fired appliances, including, but not limited to vent sizing, location, clearance to combustibles, and safe installation practices. The installation must comply with both the above Federal Codes and with state, provincial and local codes.

Design and installation of venting systems should be done only by qualified and knowledgeable venting systems personnel and in accordance with vent system manufacturer’s installation instructions. Installing a boiler or vent system using improper installation methods or materials can result in serious injury or death due to fire or asphyxiation.

Before connecting a boiler to a venting system, it must be determined whether the boiler is to be installed in a conventional or Direct Vent configuration. In the US, provisions for combustion and

ventilation air must be in accordance with NFPA 54/ANSI Z223.1, National Fuel Gas Code, latest edition, or

applicable provisions of the local building codes. In Canada, combustion and ventilation air openings shall

comply with CAN/CSA B-149.1 Natural Gas and Propane Installation Code.

For correct installation of vent system, read all of these instructions and refer to vent manufacturer’s instructions.

Failure to use a proper vent system (types and materials), as described in this manual will void the boiler warranty and may result in rapid deterioration of the venting system, creating a health or life safety hazard.

Faulty vent installation can allow toxic fumes to be released into living areas. This may cause property damage, serious bodily injury or death.

3.5.1.1 Gas Vent Categories

Several codes and standards have categorized appliances in accordance with the flue gas temperature and pressure produced by the appliance. Categories are defined as follows:

 Category I An appliance that operates with a non-positive vent static pressure and with a vent tempera-

ture that avoids excessive condensate production in the vent.

 Category II An appliance that operates with a non-positive vent static pressure and with a vent tempera-

ture that may cause excessive condensate production in the vent.

 Category III An appliance that operates with a positive vent static pressure and with a vent temperature

that avoids excessive condensate production in the vent.

 Category IV An appliance that operates with a positive vent static pressure and with a vent temperature

that may cause excessive condensate production in the vent.

 Direct Vent An appliance that is constructed and installed so that all air for combustion is derived directly

from outdoors and all flue gases are discharged to the outdoors.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

3.5.1.2 Venting Materials for Flue/Exhaust Systems

MODU-FIRE with a temperature that is likely to cause condensation in the vent. Therefore, any venting system used with the MODU-FIRE

Forced Draft boilers are Category IV appliances, which vent with a positive exhaust pressure and

Forced Draft boiler must comply with the requirements for Category IV venting systems as speci-

fied in the latest edition of NFPA 54/ANSI Z223.1 in the US or the latest edition of CAN/CSA B-149.1 in Canada.

The venting materials listed below are intended for the venting of gas burning appliances only. Do not use these venting materials for venting liquid or solid fuel (such as oil, kerosene, wood or coal) appliances.

Maintain clearances to combustibles as listed in the vent manufacturer’s installation instructions or as set forth in the codes and standards listed in this section.

Do not use these vent pipes for incinerators of any sort.

3.5.2 Combustion Air

Combustion air must be free from dust, lint, etc. The presence of such materials in the air supplied to the burner could cause nuisance "Low Air" shutdowns or premature burner failure. The boiler should not be operated during construction while the possibility of drywall dust, demolition dust, etc. exists.

The combustion air supply must be completely free of chemical fumes which may be corrosive when burned in the boiler. Common chemicals which must be avoided are fluorocarbons and other halogenated compounds, most commonly present as refrigerants or solvents, such as freon, trichlorethylene, perchlorethylene, chlorine, etc. These chemicals, when burned, form acids which quickly attack the boiler and the boiler stack. The result is improper combustion and premature boiler failure.

Under no circumstances shall the boiler room ever be under a negative pressure.

Particular care should be taken when exhaust fans, compressors, air-handling units or other equipment may rob air from the boiler. Note that this equipment might be in rooms other than the boiler room.

3.5.2.1 Air Inlet Requirements – United States (NFPA 54/ANSI Z223.1 & NFPA/ANSI 211)

When air is supplied from inside the building, the total required volume shall be the sum of the required volume for

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

all the appliances located in the mechanical room. Adjacent rooms furnished with fixed openings communicating directly with the mechanical room are considered part of the required volume. The minimum volume is 50 ft 1000 Btu/hr (4.8 m

/kW) of installed appliance input capacity.

per

Openings used to connect indoor spaces to obtain the required minimum volume shall be sized as follows:

 When rooms are on the same floor, each opening shall have an area equal to 1 square inch for each 1000

Btu/hr (2200 mm

/ kW) of installed appliance input capacity, but not less than 100 square inches. One opening should commence less than 12 inches above the floor and the other less than 12 inches below the ceiling. The minimum dimension of air openings shall be 3 inches.

 When rooms are on different floors, each opening shall have an area equal to 2 square inches for each 1000

Btu/hr (4400 mm

/ kW) of installed appliance input capacity.

When combustion air is supplied from outside the building, the boiler room shall be provided with one or two openings to ensure adequate combustion air and proper ventilation.

When using one permanent opening, the opening shall commence within 12 inches of the ceiling and shall communicate directly with the outdoors or through a vertical or horizontal duct that communicates to the outdoors.

 Minimum free area of the opening is 1 square inch for each 3000 Btu/hr (700 mm

/ kW) of installed appliance

input capacity, and

 Not less than the sum of the areas of all vent connectors in the room.

When using two permanent openings, one opening shall commence within 12 inches above the floor and the other within 12 inches below the ceiling, preferably on opposite walls. The openings shall communicate directly, or by way of ducts, with free outdoor air. The minimum net free area of the openings shall be calculated in accordance with the following:

 When air is taken directly from outside the building, each opening (minimum of two, as outlined above), 1

square inch for each 4,000 Btu per hour (550 mm

 When air is taken from the outdoors through a vertical duct into the mechanical room, 1 square inch per 4,000

Btu per hour (550 mm

 When air is taken from the outdoors through a horizontal duct into the mechanical room, 1 square inch per

2,000 Btu per hour (1100 mm

/kW) of total boiler input is required.

NOTICE!

1. The required size of openings for combustion and ventilation air shall be based on the net free area of the opening.

2. Screens shall be not smaller than ¼”

3. Motorized louvers shall be interlocked with the appliance so that they are proven open prior to main burner ignition and operation.

Table of US Minimum area of ventilation openings per boiler (sq inches)

AIR SOURCE

INDOOR AIR SUPPLY OUTDOOR AIR SUPPLY

TWO OPENINGS

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

MFD

MODEL

SAME FLOOR DIFF FLOORS ONE OPENING

DIRECT

VERT DUCT

HORIZ

DUCT N2500 2500 5000 833.3 625 625 1250 N3000 3000 6000 1000 750 750 1500

3.5.2.2 Air Inlet Requirements – Canada (CAN/CSA B149.1)

A. Ventilation of the space occupied by fuel burning appliance(s) or equipment shall be supplied by a ventilation

opening at the highest practicable point communicating with the outdoors. The total cross sectional area of the ventilation opening must be either 10% of the net free area required for combustion air or 10 sq. in. (6500

), whichever is greater.

B. Use the following opening calculation for MACH

condensing boilers or MODU-FIRE® Forced Draft boilers:

When combustion air is supplied for a forced draft burner by natural airflow from the outdoors and there is no draft regulator or draft hood in the same space, there shall be a permanent opening with a cross sectional area not less than 1 sq. in/ 30,000 Btu/Hr (70 mm

/kW) of the total rated input to the burner(s). This opening

must not interfere with the ventilation air opening defined in paragraph A.

C. Use the following opening calculation for P-K THERMIFIC

boilers or other natural draft or fan-assist appli-

ances:

When combustion air is supplied for natural or fan-assisted burners by natural airflow from the outdoors, there shall be a permanent opening with a cross sectional area not less than 1 sq. in/ 7000 Btu/Hr (321 mm up to and including 1,000,000 Btu/Hr plus 1 sq. in. / 14,000 Btu/Hr (155 mm

/kW) in excess 1,000,000 Btu/Hr.

/kW)

This opening must be either located at or ducted to a point not more than 18 in. (450 mm) nor less than 6 in. (150 mm) above floor level. This opening is in addition to the ventilation air opening defined in paragraph A.

D. When combustion air is supplied by natural airflow into a space containing both types of appliances described

in paragraphs B and C, the cross sectional area of the opening shall be not less than the sum of the cross sectional areas for all appliances in the space as calculated by the applicable method . This opening is in addition to the ventilation air opening defined in paragraph A.

E. When a duct is used to meet the requirement for combustion air supply, as described in paragraphs A through

D, above, the opening of the duct shall be located so there is no possibility of cold air affecting steam or water piping, electrical equipment or mechanical equipment.

F. When combustion air is supplied by mechanical means, an airflow-sensing device must be installed. It must

be wired into the pre-ignition limit string to prevent the burner from starting or to stop an operating burner in case of air supply failure.

G. When all combustion air is supplied through a make-up air heater, and the appliance is interlocked to the

heater, the requirements of paragraphs A through F do not apply.

NOTICE!

1. The free area of a combustion air supply opening is calculated by deducting the blockage area of any fixed louvers, grilles or screens from the total area of the opening.

2. Screens shall be not smaller than ¼”

3. Motorized louvers shall be interlocked with the appliance so that they are proven open prior to main burner ignition and operation

Table of Canadian Minimum Area of Combustion and Ventilation Air Openings

MFD Required Combustion Air Opening Ventilation Air Opening

Model # Input (Btu/Hr) in2 mm2 in2 mm2

N2500 2,500,000 83.3 53,763 10 6,452 N3000 3,000,000 100 64,516 10 6,452

3.5.3 Flue Venting

This boiler is not certified for use with Type "B" vent nor with any type of plastic venting.

This boiler is a Category IV appliance (condensing – positive pressure) as it is defined in ANSI Z21.13/CSA 4.9, latest edition. The vent material must be as described in section 3.5.1.2. The exhaust vent can be run horizontally or vertically.

Vent installations shall be in accordance with NFPA54/ANSI Z223.1, the National Fuel Gas Code, or CAN/CSAB149.1, the Natural Gas and Propane Installation Code, or applicable provisions of the local building codes.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

3.5.3.1 VENT SIZING

The vent must be sized in accordance with the ASHRAE Systems and Equipment handbook, Chapter 30 or according to the vent manufacturer’s recommendations. When using manufactured venting systems, consult your vent supplier for correct sizing and structural support requirements.

Table of Vent Design Parameters

MFD Model

Frictional

Resistance

Stack

Temperature

Natural Gas CO2 LP Gas

N2500/N3000 1.0” Max 300°F (gross) 8.5% 10.3%

The vent must be sized according to the vent manufacturer’s recommendations. Consult your vent supplier for correct sizing and structural support requirements. Design calculations should be based on a positive pressure at the flue collar, not to exceed 1.0 inch W.C. with a stack temperature of 300° F (gross) and a CO

level of 8.5% natural gas. The vent should be designed to provide positive pressure at the flue collar at all firing rates.

NOTICE! Refer to example in section 3.5.5 regarding pressure drop across the boiler.

Do not use a barometric damper with this boiler. This is a positive pressure sys-

tem. Flue gases may leak into the room.

This equipment MUST NOT be used with a heat actuated automatic vent damper.

All boiler venting systems should be designed by a qualified venting professional experienced in venting system design. The information contained herein should be used as a guide only and is not intended to be used in lieu of qualified technical expertise.

3.5.3.2 Required Clearances

Provide clearances between combustion air intake, exhaust vent, roof and wall surfaces, doors and window, and snow line. Refer to Figure below: Termination Clearances – Forced Draft and Direct Vent Installations.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Do not locate intake or exhaust terminations directly above a walkway;

dripping of condensation can cause icing of the walking surface. Maintain a minimum clearance of 4 ft (1.22 m) horizontally from any electric or gas meter, regulator or relief equipment.

Conventional Vent Systems

The following termination clearance requirements are for conventional, non-direct vent installations.

 The vent system shall terminate at least 3 ft above a forced air inlet that is within 10 feet horizontally.  The vent system shall terminate at least 4 ft below, 4 ft horizontally from or 1 ft above any door, operable win-

dow or gravity inlet into any building. The bottom of the vent terminal shall be at least 12 in. above grade or highest expected snow line (if applicable).

 Through the wall terminations shall not terminate over public walkways or over an area where condensate or

vapor could create a nuisance or hazard or could be detrimental to the operation of regulators, relief valves or other equipment.

Direct Vent (Sealed Combustion) Systems

 The vent terminal shall be located at least 12 in. from any air opening into a building. The bottom of the vent

terminal shall be at least 12 in. above grade. Both the vent and air intake terminals must be at least 12 in. above the highest expected snow line.

 Through the wall terminations shall not terminate over public walkways or over an area where condensate or

vapor could create a nuisance or hazard or could be detrimental to the operation of regulators, relief valves or other equipment.

 When multiple direct vent appliances are adjacent, the exhaust must terminate at least 10 feet horizontally or

three feet vertically from the air intake of another appliance.

Interior Component Installation Clearances

All vent system components shall be installed so as to maintain the following required minimum clearances:

Vent Type and Clearance Type Combustible Surface Non-Combustible Surface

UL 1738 listed Category IV vent Per manufacturer’s listing Per manufacturer’s listing

3.5.3.3 Flue Connection

The boiler vent should not be connected into any portion of another mechanical draft system without consulting the vent manufacturer. This boiler operates under a positive vent pressure. The boiler shall not be connected to any part of a vent system serving a Category I or II appliance, nor shall a Category I or II appliance be connected to any part of the vent system serving this appliance. Improper interconnection of venting systems may result in leakage of flue gases into occupied spaces.

NOTICE! Make sure that the weight of the vent is not supported by the boiler vent collar. The collar is not designed to support the weight of the vent. The vent system shall be supported in accordance with the manufacturer’s instructions. Horizontal vent sections shall be supported in a manner to prevent sags or low spots where condensate can collect. Structural supports must be connected to building elements of sufficient strength to withstand the weight of the vent system and any bending forces imposed by the venting system.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

This boiler has 10” OD connections for the vent. If venting design permits, this connection may be reduced to 8” diameter. The connection from the boiler to the vent should be made using an adapter that is designed to fit the OD of the boiler outlet. The vent manufacturer’s adapter must be sealed to the boiler outlet with sealant listed for use with the vent material. The connection from the boiler to the vent should be as direct as possible and the upward slope of any horizontal breaching should be at least ¼ inch per linear foot. Provisions must be made for supports to prevent contact of the vent with combustible surfaces.

The complete exhaust with drain system is shown in the figures below. The appliance connector should incorporate provisions to drain condensate formed in the vent system. The first turn from horizontal to vertical should be made with either a standard tee with condensate drain cap or an elbow with an “inline” drain installed immediately above the elbow. The condensate drain line from the boiler must be connected to the stack drain upstream of the stack trap using a material that will withstand condensate corrosion and a maximum temperature of 400°F. The stack trap shall have a minimum height of 4 inches. The condensate must be routed to a suitable drain that complies with all local codes.

The boiler condensate drain line can get as hot as the stack. This may be up to 400ºF. This line should be insulated to prevent thermal injury or burns.

Do NOT use copper or plastic for the boiler condensate line, as these may fail and allow exhaust gas to leak into the room.

Building Sidewall

Pitch Towards Boiler ¼” per foot min

Boiler Outlet

10” OD

Boiler Condensate Drain (stainless steel or silicone tubing)

3.5.3.4 Vent Terminations

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

See 3.6.6 for termination details

Tee w/Drain

Stack Drain w/Trap 4” min height

The vent shall extend at least three (3) feet above the roof, or at least two (2) feet above the highest part of any structure within ten (10) feet of the vent. This is illustrated in the following diagram. Additionally the boiler vent shall terminate at least 3 ft above a forced air inlet located within 10 ft.

Reference: NFPA 54/ANSI Z223.1 National Fuel Gas Code

To prevent the possible re-circulation of flue gases, the vent designer must take into consideration such things as prevailing winds, eddy zones, building configurations, etc. Harsco Industrial, Patterson-Kelley cannot be responsible for the effects such adverse conditions may have on the operation of the boilers. Dimensions listed above are minimums and may not be sufficient for conditions at a specific job site. It is important to locate the exhaust duct in such a way that it does not become blocked due to snow, ice, and/or other natural or man-made obstructions.

VERTICAL VENTING

Harsco Industrial, Patterson-Kelley does not recommend the use of a vent cap. A screen termination is not recommended due to the possibility of ice formation on the screen. Rain is actually beneficial to the vent internals.

SIDEWALL VENTING – N2500 & N3000 MFD

Harsco Industrial, Patterson-Kelley requires a “T” or 90 degree elbow to be used on the termination end of sidewall venting on these models. The venting connection for this “T” or 90 degree elbow should extend a minimum of 12” from the wall, in addition to other venting

requirements.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Thru the roofThru the roof

Thru the Wall

Note:

Note: Elbow and Tee

Elbow and Tee May be oriented

May be oriented in any direction

in any direction

3.5.4 Venting for Multiple Boilers

The venting instructions in this manual apply to a single boiler.

Venting systems for multiple boilers must be designed by experienced and knowledgeable professionals. The venting system must prevent backflow of exhaust gas through idle boilers.

3.5.5 Sealed Combustion/Direct Vent Systems

The MODU-FIRE ized venting system. Such a system employs a sealed combustion air intake duct leading from outdoors and a sealed exhaust vent terminating outdoors. Air flow through the system is maintained by the combustion air fan. Intake Duct Materials and Sizes

The air intake duct can be fabricated from PVC, CPVC, single wall galvanized steel, or other suitable materials. The duct must be rigid enough to maintain the full required cross sectional area under all operating conditions. Proper sealing of the intake ductwork is necessary to prevent infiltration of air from conditioned space. Joints in PVC or CPVC must be cemented. For galvanized duct, wrap each joint and seam with adhesive aluminum tape or other sealant. Connect the air supply duct to the inlet air collar on the boiler. Fasten the duct to the collar with sheet metal screws and seal with aluminum tape or sealant. The installation of a birdscreen on the intake termination is recommended. Ensure that the screen does not become blocked with snow, ice, insects etc.

The combined pressure drop of the air supply duct and exhaust vent must not exceed 1.0” w.c. This combined pressure drop can

be distributed over the intake or exhaust as needed provided that the air inlet pressure loss does not exceed -0.5” w.c.

Forced Draft boilers are also certified for operation with a sealed combustion air and pressur-

Air Requirements – SCFM

MFD MODEL Required SCFM

N2500 583

N3000 700

3.5.6 Removing an Existing Boiler

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, while the other appliances remaining connected to the common venting system are not in operation, the following steps should be followed with each appliance remaining connected to the common venting system placed in operation:

1. Seal any unused openings in the common venting system.

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

3. 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 appliances 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 fireplace dampers.

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

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

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

6. 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, fireplace 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, NFPA 54/ANSI Z223.1 and CAN/CSA B149.1 Installation Code. When resizing any portion of the common venting system, the common vent system should be resized to approach the minimum size as determined using the appropriate tables.

3.6 G

Before making the gas hook-up, make sure the boiler is being supplied with the type of fuel shown on the boiler nameplate. The boiler must be installed such that the gas system components are protected from water (dripping, spraying, rain, etc.) during appliance operation and service (circulator replacement, control replacement, etc.) The boiler is factory fire-tested and adjusted for proper combustion with a natural gas supply pressure of 8 inches W.C. Typical supply gas pressure is 8 inches W.C. for natural gas. The gas train components are certified to handle a maximum inlet pressure of 14 inches W.C. (1/2 psig.). If the available gas pressure exceeds 14 inches W.C., a suitable additional intermediate gas pressure regulator of the “lock up” type must be provided to reduce the pressure to less than 14 inches W.C.

resistant to the action of liquefied petroleum gases. Do not use Teflon tape on gas line threads. NOTICE! Piping must be installed such that no piping stresses are transmitted to the boiler. The boiler shall

not be used as a pipe anchor.

AS PIPING

All threaded connections must be made using a pipe compound that is certified

The boiler and all gas piping connections should be pressure-tested and must be checked for leaks before being placed into service. Test with compressed air or inert gas if possible.

The boiler must be disconnected at the boiler manual shutoff valve (located at the end of the supplied gas train) from the gas supply piping system during any pressure testing of the system at pressures in excess of 1/2 psig (14” W.C.).

During any pressure testing of the gas supply piping system at pressures equal to or less than 1/2 psig (14" W.C.), the boiler should be isolated from the gas supply piping system by closing the manual shut-off.

Some leak test solutions, including soap and water, may cause corrosion. These solutions should be rinsed off with water after testing.

RECOMMENDED GAS PIPING INSTALLATION

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Gas Supply

Remote Gas Shutoff

Drip Leg

Union

Boiler Main Gas Valve

Field Gas Piping

Install a sediment trap (drip leg) and a union connection should be installed upstream of the primary manual shutoff valve on the boiler. Gas piping should be installed in accordance with National Fuel Gas Code, NFPA 54/ANSI Z223.1, latest edition, and any other local codes which may apply. In Canada, please refer to CAN/CSAB149.1

Pipe Capacity for Natural Gas

NOTICE! See Pipe Capacity for Natural Gas chart for required pipe size, based on overall length of pipe from meter plus equivalent length of all fittings. Approximate sizing may be based on 1 cubic foot of natural gas per 1,000 Btu per hour input, i.e., 3,000,000 Btu per hour requires about 3,000 cubic feet per hour.

Nominal

Iron Pipe

Size

(Inches)

Internal

Diameter

(Inches)

Equivalent Pipe

Length

90º Ell

(Feet)

Tee

(Feet)

Maximum Capacity in Cubic Feet of Natural Gas per Hour

Pressure Drop of 0.5 inch Water Column/Equivalent Length of

Pipe (in feet)

100

150 200

2 2.067 5.17 10.3 2,750 1,900 1,520 1,300 1,150 950 800

2-1/2 2.469 6.16 12.3 4,350 3,000 2,400 2,050 1,850 1,500 1,280

3 3.068 7.67 15.3 7,700 5,300 4,300 3,700 3,250 2,650 2,280 4 4.026 10.1 20.2 15,800 10,900 8,800 7,500 6,700 5,500 4,600

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

3.7 B

OILER WATER PIPING

3.7.1 Piping Design

3.7.1.1 Water Flow in System

Ideal operation of the MODU-FIRE

Forced Draft boiler would consist of a 20º F temperature differential across

the heat exchanger at high fire. Insufficient flow may result in excessive short cycling of the boiler and eventual damage or premature failure of the equipment.

NOTICE! The closing of the flow switch does not prove that flow is adequate. It only indicates that some flow is present. The proper water flow rate for the N2500 & N3000 MFD is 165-325 gpm.

Minimum Return Water Temperature should be

greater than 130º F to avoid problems of condensation on the outside of the heat

exchanger or in the flue passages.

Proper flow rates and return water temperature may be achieved through a combination of primary and

Pressure Drop (ft of hea

150 175 200 225 250 275 300 325

Flow (GPM)

secondary flow loops. Multiple zones and pumps may result in different flow rates at different times. Consideration must be given to all possible conditions and their consequences.

3.7.1.2 Piping with Refrigeration Machines

When used with a refrigeration system, the boiler shall be installed so that chilled medium is piped in parallel with the boiler. Valves should be installed to prevent chilled water from entering the boiler when the system is operated in the cooling mode.

3.7.1.3 Piping with Air Handling Units

The boiler piping system of a hot water heating boiler connected to heating coils located in air handling units, where they may be exposed to refrigerated air circulation, must be equipped with flow control valves or other automatic means to prevent gravity circulation of the boiler water during the cooling cycle.

3.7.2 Boiler Water Connections

Relief Valve

Strainer

Isolating Valve

Outlet to S

stem

Inlet from S

stem

Isolating

Valve

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Boiler

Drain

Schematic showing rear of boiler (for a more detailed view, see section 4.0)

Make water connections as the application warrants or, at a minimum, as shown, but always in compliance with the local requirements.

Both boiler water connections are 3” pipe, class 150#, ANSI B16.5 flanges. These require a mating flange, bolts, and a gasket (all field supplied).

NOTICE! Isolating valves must be installed in both water connections for ease of service.

As you are facing the rear of the boiler, the right side connection (with the relief valve on it) is the boiler OUTLET and must be connected as the hot water supply to the system. The left connection is the boiler INLET be used for the cold water return from the system.

Piping must be installed such that no piping stresses are transmitted to the boiler. The boiler shall not as a pipe anchor.

3.7.3 Boiler Water Piping by Installer

3.7.3.1 Strainer

To avoid possible contamination of the boiler with dirt, rust or sediment from the system, a strainer near the boiler inlet is strongly recommended. Even new systems may contain sufficient foreign material to eventually reduce the performance of the heat exchanger. Adequate circulation of good clean water is essential to maximum

efficiency and long life of the boiler.

Drain

and must

be used

3.7.3.2 Relief Valve and Piping

Each boiler is supplied with a pressure-relief valve sized in accordance with ASME requirements. The relief valve must be piped to a suitable drain prior to placing the boiler into service and in a manner that prevents water spray from contacting any person. Reducing couplings or other restrictions are not permitted in the discharge line.

Do not plug or obstruct the discharge of the relief valve.

3.7.3.3 Low Water Cut-off

The boiler is furnished with a flow-switch-type low water cut-off as required by the ASME BPV Code, Section IV. No field piping is required. If the flow switch does not sense water flow, the boiler will shut down and a red indicator will be illuminated on the control panel.

Installation of an external low water cutoff or manual reset low-water switch may be required by certain codes or in certain installations. Consult your local code for details.

Never install a valve that can isolate the low water cut-off from the boiler.

3.7.3.4 Drain Valve and Piping

The boiler is provided with external drain connections. A drain valve is installed in the bottom of the boiler. Prior to draining the boiler for maintenance or testing, electrical power and gas supply must be turned off to the boiler. The boiler must then be isolated from the system at the supply and return connections prior to draining water from the boiler.

NOTICE! This drain valve is installed for draining of the boiler water only, not the entire system. Draining of the system through the boiler will result in depositing sediment from the system in the boiler which will result in poor heat transfer characteristics of the boiler and early boiler failure.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

3.7.4 Flushing and Filling

3.7.4.1 Flushing the System

Before filling the boiler, flush the system to remove the debris. Clean and flush old piping thoroughly before installing the boiler as recommended by your water conditioning or chemical treatment supplier.

Under no circumstances should the hydronic system be flushed while the boiler is attached to the system since the debris or corrosion products could accumulate in the boiler and plug the boiler heat exchanger.

If the piping system attached to this unit will be chemically cleaned, the boiler must be disconnected from the system and a bypass installed so that the chemical cleaning solution does not circulate through the boiler.

3.7.4.2 Filling

To insure that no air is trapped during the filling process, open the pressure-relief valve located at the rear of the boiler prior to filling the boiler. While filling, leave the relief valve open until a steady flow of water is observed. Close the valve and finish filling the system.

3.7.5 Water Quality

The boiler is designed to operate in a closed-loop system using water or water/glycol only. As such, the system should be tight and not require make-up water. A high percentage of untreated make-up water can cause premature failure due to build up of scale. Such failure is not covered by warranty.

Scale can also reduce efficiency. For example, a scale thickness of 1/16 inch will result in a 12.5% loss of efficiency.

Consult your water conditioning or chemical treatment supplier for analysis and recommendations. Employing a conscientious and competently administered program with emphasis on good maintenance practices as outlined by your water treatment specialist is recommended.

If water/glycol is to be used in the system, the customer should perform a hazard analysis to determine proper use and disposal.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

3.8 B

URNER AND IGNITION SYSTEM

3.8.1 Inspection

Inspect the burner to be sure nothing was damaged or knocked loose during shipment. Inspect the main gas train and ignition assembly to be sure they were not damaged during shipment or installation. Inspect the ignition wire and igniter to be sure they were not damaged nor cracked.

Check all gas unions for tightness.

3.9 P

RE-START CHECK LIST

Before attempting to start the boiler, make sure the following items have been completed.

1. Flue gas from the boiler is properly vented. (See section 3.5)

2. Gas connection has been made, pressure tested for leakage, and the line purged of air. (See section 3.6)

3. Water connections are complete, and the boiler and system have been filled and purged of air. (See section

3.7)

4. The boiler must be connected to a 240 volt / 60 Hz / 1 Ph power source with proper polarity, a dedicated machinery ground, and provided with a disconnect having adequate overload protection. (See section 3.4)

5. Combustion air openings are not obstructed in any way and have adequate capacity. (See section 3.5)

6. The boiler is located with the proper clearances as shown in this manual. (See Section 3.3.3)

7. Relief valves have been properly piped to floor drains. (See section 3.7)

8. There are no flammable liquids, materials or hazardous fumes present in the environment.

9. Remove/account for all tools and parts.

10. All panels and parts should be properly installed.

3.10 S

AFETY CHECKS

The following checks of safety systems must be made before putting the boiler into normal operation.

Before firing the boiler refer to Sections 4.1 and 4.2 for information on the use of the controls, lighting, and shutdown procedures.

Never attempt to operate a boiler that has failed to pass all the safety checks

described below.

After checking controls by manual adjustment, make sure they are always reset to

their proper settings. Verify proper operation after servicing.

3.10.1 Test of Ignition Safety System

Test the ignition system safety shutoff as follows:

1. Remove the black plug/connector from the main gas valve (it is held on with a central screw).

2. With the main gas cock (inlet manual gas valve) open, the burner should be cycled on. After all the safety limits such as gas pressure, water flow and temperature are satisfied, the blower will run and pre-purge the boiler.

3. Once the purge is complete (30 seconds), the ignition transformer will be energized. There will be a 4 second trial for ignition period. During this period the boiler is attempting to light.

The main gas valve will not open because there is no power to the valve due to the disconnected wires.

Hence, no flame will be established and the flame safeguard will not receive a flame signal from the UV scanner.

5. After 4 seconds, the flame safeguard programmer will recognize a “Flame Failure” condition and go to a “lockout” mode. Lockout will require manual reset of the flame safeguard.

After completing this test, turn off the boiler and reconnect the wires to the main gas valve.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

3.10.2 Test of Low Water Cut-off

The boiler is furnished with a flow-switch-type low water cut-off in the outlet nozzle. Test as follows:

1. Turn boiler and then system pump off.

2. Turn boiler back on.

3. The red “Low Water” light should illuminate and the boiler should not start.

Perform appropriate tests on any external probe-type low water cut-off.

3.10.3 Test of Limit Controls

Fire the boiler and test the high limit control as follows:

With the main burner operating, turn down the temperature setting on the "high-limit" thermostat (located in the control panel below the digital operating control) until the main burner shuts off. The high-limit switch must be manually reset by pushing the small green lever. A similar check should also be made for the digital operating temperature control (see Section 3.11 for instructions on setting this control). After completion of these tests, readjust the operating thermostat to the desired operating temperature and set high-limit temperature, typically 20º F above operating temperature.

3.10.4 Test of Low Gas Pressure Switch

Manual Reset

Gas Pressure Switch

The boiler is furnished with a low gas pressure switch. This switch must be set at 5” w.c. The operation of this switch must be checked by slowly closing the main gas cock while the burner is operating. The switch should shut down the main burner.

3.10.5 Test of High Gas Pressure Switch

The boiler is furnished with a high gas pressure switch. The operation of this switch must be checked by closing the downstream main gas cock, and starting the boiler. Once the trial for ignition period is reached, the main gas valve will open, pressurizing the line. This will trip the high gas pressure switch.

The high gas pressure switch must be manually reset after it trips.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

3.11 Boiler Operating Control

The MODU-FIRE® Forced Draft boiler is equipped with a combination combustion and temperature control. This control monitors combustion and lighting of the boiler, as well as maintaining temperature of the supply water. The temperature control portion modulates the boiler to maintain the desired outlet temperature based on the selected operating configuration.

3.11.1 Initial Adjustments

The ENVI

control uses a Liquid Crystal Display (LCD) as a method of supplying information. The LCD is used to setup and monitor system operation by means of six push buttons RESET, MENU, BACK, ENTER, UP & DOWN (Scroll, ▲,▼). Scroll advances the display, while ▲,▼are used in the adjust menu.

The lighted window in the center is a four line LCD that shows boiler operating information on various screens. These screens are shown below with an introduction to the control operating features. For additional information, the ENVI

control manuals may be obtained from the Harsco Industrial, Patterson-Kelley factory.

3.11.1.1 Operation of the control

The home page is the default screen that is shown upon startup. This screen shows the date, time, boiler status, supply temperature and setpoint temperature. The buttons across the bottom are used to navigate through the various screens. Pushing the MENU button displays a menu of options.

Standby

Information

Errors

3.11.1.2 Configuring the Control

First push the MENU button and then select PROGRAM PARAMETERS from the menu. A screen opens that allows the user to view and change various operating parameters.

Parameters

CH settings

DHW settings

Boiler settings

CH set ti ngs

Setpoin t 180°F

BLR OP 1

BLR OP 1 CH mode 0

CH mode 0

The menu includes access to the STANDBY, INFORMATION, ERRORS, PROGRAM PARAMETERS, CONFIGURATION, CASCADE, and SERVICE menus. The UP and DOWN buttons are used to position the arrow next to the desired option and the ENTER button is pushed to access that option.

Select the CH SETTINGS to adjust parameters related to the boilers Comfort Heat function.

For example, selecting the SETPOINT parameter opens up a screen that allows the setpoint to be changed.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

CH settings

Setpoint

Setpoint Value: 180°F

Value: 180°F Range: 45°F – 185°F

Range: 45°F – 185°F

3.11.1.3 Other Control Parameters

Other parameters are available and may be changed by contacting the factory for assistance. The ENVI Getting Started Guide contains additional information regarding the operation of this control.

NOTICE! Changing parameters requires an understanding of the parameters and the functionality of the boiler. The boiler may not function properly if parameters are changed from the factory values.

3.12 C

There is no required start-up or field adjustments for air flow control. The air flow is set at the factory.

3.12.1 Fuel/Air Ratio Adjustment

The fuel/air ratio is controlled by the automatic air gas ratio valve. This valve is adjusted at the factory to give 5.8-

6.5 % O2 at high fire and 7.0-7.5% O2 at low fire in the exhaust gas. However, the fuel/air ratio should be

OMBUSTION ADJUSTMENT

The UP or DOWN buttons are used to adjust the CH setpoint up or down as desired.

Control

checked using a combustion analyzer at start-up to verify that the combustion is proper. Remove the exhaust vent plug and place the analyzer probe in the exhaust as shown. Be sure to replace the plug after combustion has been set.

Start the boiler. Using the control panel, access the SERVICE menu. The service menu allows the operator to manually set the boiler to HI or LOW operation for setup and/or troubleshooting. Pressing the SVC shortcut key (DOWN button when the default screen is present) accesses the SERVICE menu. Users can also access the SERVICE menu by pressing the MENU button and using the UP and DOWN buttons until the cursor is next to SERVICE. Press ENTER.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Service

BNR ON Test HI LOW

BNR ON Test HI LOW BNR OFF Fan HI LOW

BNR OFF Fan HI LOW

Two test modes are available:

1) BNR ON TEST HI LOW

2) BNR OFF FAN HI LOW

The first test mode allows the service technician to hold the boiler in high or low fire during operation so that the combustion adjustment can be performed. Press the UP or DOWN button to select BURNER ON or BURNER OFF, press ENTER. Then press the UP button followed by ENTER to select HIGH or DOWN followed by ENTER to select LOW operation.

The second test mode checks the fan rate with the burner off at high speed or at low speed.

These test modes will automatically terminate after 15 minutes of inactivity or can be terminated from the control/display panel by pressing the cancel/reset button

If the % O hi fire, turn the bottom screw “V” counterclockwise to reduce the % O Once high fire is adjusted, place the boiler in low fire using the control panel and adjust the % O turning the top screw “N” counterclockwise to reduce the % O

NOTICE! For High altitude adjustments contact Harsco Industrial, Patterson-Kelley Technical service for Service Bulletin No. 05-08.

is not within the range above at high fire, the gas valve should be adjusted. To adjust the gas valve on

or turn it clockwise to raise the % O2 .

or clockwise to increase the % O2.

if necessary, by

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Bias (N)

Adjust at Low Fire

Ratio (V)

Adjust at Hi Fire

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

4 OPERATION

4.1 GENERAL

Instructions

ENVI® Control

part has been under water. Immediately call factory-trained personnel to inspect the boiler and replace any part of the control system and any gas control which has been exposed to water.

Pop-Latch (2)

On/Off Switch

The front of the control panel shows Operating Instructions and the control interface for the boiler. The boiler operating controls are accessed by turning the pop-latches ¼ turn, and opening the front cover.

4.1.1 Normal Operation

Under normal operating circumstances, this boiler functions as a fully automatic appliance. The automatic control senses the water outlet temperature and fires the boiler when heat is needed by the system. Additionally this boiler may function as part of an integrated building management system.

4.2 L

IGHTING AND SHUT-DOWN PROCEDURES

Do not use this boiler if any

4.2.1 Initial Lighting Procedures

1. Utilities: Turn on electrical supply to the boiler. The blower will purge

briefly as the system controls get power. Open the manual gas supply valves. Make sure the system is filled with water and turn on the circulation pump.

2. Reset Switches: Press the reset button on both the high gas and low gas

pressure switches if the gas supply had previously been turned off. Press the control reset button after a safety lockout.

3. Turn on the power switch. The blower will purge briefly as the electronic

controls energize. If the boiler control shows a warning or lockout annunciation, see Section 5.6 of this manual to troubleshoot the problem and take the necessary corrective action before proceeding.

4. Set the desired high temperature limit and operating temperature.

5. The lighting and operation of this boiler is fully automatic.

4.2.2 Normal Shut Off Procedures

1. Place the on/off switch in the off position.

2. Close all manual gas valves.

3. Turn off electrical power.

4.2.3 Emergency Shut Off Procedures

The main gas cock should be closed immediately. If overheating occurs or the gas supply fails to shut off, do not turn off or disconnect the electrical supply to the pump. Instead, shut off the gas supply at a location external to the boiler.

Gas Shutoff

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

5 MAINTENANCE

All weekly, monthly and annual maintenance checks should be performed by experienced and knowledgeable personnel.

Installation and service must be performed by an experienced and knowledgeable individual, such as a Harsco Industrial, Patterson-Kelley representative, qualified installer, service agency or gas supplier.

Proper lockout /tagout procedures must be employed when servicing this unit. A hazard analysis should be performed by the end user to insure the safety of their employees and/or service technicians.

5.1 M

cause improper and dangerous operation.

Verify proper operation after servicing.

AINTENANC E AND INSPECTION SCHEDULE

Label all wires prior to disconnection when servicing controls. Wiring errors can

5.1.1 Daily

Observe operating temperature and general conditions. Make sure that the flow of combustion and ventilating air to the boiler is not obstructed. Determine the cause of any illuminated red indicators, unusual noises or operating conditions and make the necessary corrections.

Check daily to be sure that the boiler area is free and clear of any combustible materials, including flammable vapors and liquids.

5.1.2 Weekly

Observe the conditions of the main flame. A normal high fire flame shows an orange screen with a blue halo. In Low fire the burner should display a reddish orange glow. However, do not attempt to adjust the flame “by eye”.

Correct air adjustment is essential for the efficient operation of this boiler. If an adjustment to the combustion is necessary, the flue gas composition should be checked with a carbon dioxide (CO set conditions. Refer to Section 3.12.

5.1.3 Monthly

1. Using the control panel, enter the information mode and scroll down to view the flame signal. When the boiler is firing, the signal will be “yes” and when the boiler is not firing, the signal will be “no”.

2. Test high-limit control by reducing setting below the operating temperature. Burner should shut off. After readjusting the thermostat, press the button to reset the switch.

3. Test operating temperature control by reducing temperature setting as necessary to check burner operation.

4. Check flue gas temperature at outlet. If there is a temperature increase over previous readings, the probable cause is soot or water-scale build- up on the tubes.

) or oxygen (O2) analyzer to

5. Test the water flow switch by trying to restart boiler with the system pump off. The boiler should not operate and the control should display LOW FLOW/ILK.

6. Test low gas pressure switch and high gas pressure switch utilizing the procedure in sections 3.11.4 & 3.11.5. The boiler should fail to start and the control should display LOW GAS or HIGH GAS.

7. Inspect and clean the inlet screen of any accumulated dust or lint.

8. The relief valve should be tested as per manufacturer’s instructions or every two months by lifting the lever for 5 seconds and allowing the valve to snap shut. Please see the manufacturer’s recommendations on the relief valve tag.

5.1.4 Annually

In addition to the recommended monthly service:

1. Check burner and wash off (do not scrub or use wire brush) any soot or foreign material that may have accumulated. See Section 5.2 on "Cleaning the Burner." Check the burner and its parts. If there is evidence of deterioration or corrosion, replace immediately.

2. Inspect combustion chamber. To access the heat exchanger, remove the front door and the front inner wrapper. Note any signs of deterioration. Examine the gasket and replace if necessary, using a Harsco Industrial, Patterson-Kelley gasket kit only.

3. Inspect and clean heat exchanger. Wash the copper tubes with water and non corrosive soap. Green scale on the tubes indicates that the boiler is condensing which is detrimental to boiler life. Perform corrective action as necessary.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

4. Examine the venting system.

a. Check all joints and pipe connections for tightness.

b. Check vent for corrosion or deterioration. If any venting needs replacing, do so immediately.

5. Inspect heating system for other problems.

6. Perform combustion analysis and adjust if necessary (See 3.14.1).

7. Leak test gas valves. Leak Test must be performed only by qualified Harsco Industrial, Patterson-Kelley certified personnel, who have been trained in this procedure. This procedure is available on request from the Harsco Industrial, Patterson-Kelley Factory.

8. Perform a safety relief valve test.

5.2 CLEANING THE BURNER

Blower

Follow proper lockout / tagout procedures for the electrical, gas, and water

connections. Use caution when lifting heavy parts.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Air-Gas Mixing Head

Ignition Assembly

Burner Grid

Burner Assembly

1. Remove top and side covers from the boiler.

2. Remove the U-bolt on the gas valve, the back panel

flange over the gas pipe, and the 4 screws from the top gas valve flange.

3. Disconnect the two wire plugs on the blower, the UV

scanner, ignition wire, ground wire and the wires to the back pressure switch.

4. Disconnect the air gas mixer sensing tubes. NOTICE!

These tubes are color coded and must be correctly reinstalled.

5. Remove the air/gas mixer assembly (green) and the

gasket from the blower while leaving the piping attached. Lift the assembled air/gas mixer and piping out of the boiler and place it on the rear boiler water piping. Do not disconnect the wires to the gas pressure switch.

6. Remove the blower and gasket from the boiler. Clean

the blower vanes. Do not disassemble the blower motor or aluminum housing.

7. CAREFULLY remove the ignition assembly from the

boiler. Check the gap between the electrode and the ground rod. It should be 1/8” (+1/16, -0). The electrode should angle in towards the burner. Check for cracking of the electrode. Do NOT over-tighten the electrode

High Exhaust Back Pressure Switch

UV Detector

Ignition Electrode

Spark Gap =1/8”

0” , +1/16”

8. Leaving the burner hood attached to the mounting plate,

CAREFULLY remove the burner assembly using the six large hold down nuts. This assembly is top heavy.

Ignition Assembly

9. Check the gray grafoil gaskets around the burner flange for cracking. Replace if necessary. Replace the

red silicone gasket on the heat exchanger head.

10. Clean the burner to remove any soot or foreign material that may have accumulated. Blow the burner with

compressed air or wash off (do not scrub or use wire brush).

11. Use a soft, clean cloth to remove accumulated contaminants from the UV detector/scanner glass

envelope.

12. Before re-installing the burner, check the cleanliness of the heat exchanger and the condition of the

combustion chamber. If corrosion or leaks are noticed, please call for service.

13. Re-install components in the reverse order of removal. Be sure to reinstall all gaskets, O-rings and

electrical connections. Be sure the gas valve flange and O-ring is assembled correctly to prevent gas leaks.

14. Reinstall all covers.

15. Fire Test the boiler and use a combustion analyzer to ensure that the fuel/air ratio is set correctly. If

adjustment is required, refer to section 3.14.1.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

5.3 R

EMOVING THE HEAT EXCHANGER

Heat Exchanger is heavy and may cause injury if improperly handled. Removal of the

heat exchanger should be performed only by knowledgeable and experienced personnel.

5.4 A

FTER ALL REPAIRS OR MAINTENANCE

1. Follow "Pre-Start Check List" (Section 3.10) and all "Safety Checks" (Section 3.11) and verify proper operation.

2. Fire the Boiler and perform combustion check.

3. Adjust gas flow if necessary. (See "Gas Pressure Adjustment", Section 3.14.1)

5.5 S

EQUENCE OF OPERATION

1. In order for the boiler to start, the following limits must be satisfied:

a) Water flow switch

b) High & low gas pressure switches

c) High temperature limit

d) High back pressure switch

e) High stack temperature switch

2. When the Boiler On/Off switch is turned on, power is provided through a circuit breaker to the boiler control and the combustion blower.

3. If the high gas, low gas or low water level control is open, the boiler control locks out and displays an error.

4. When the water temperature is below the boiler control setpoint minus the hysteresis (On Differential), a heat request is generated.

5. Provided all limits are made, the boiler will attempt to start.

6. The controller checks that the air pressure switch is open indicating no airflow. The blower is driven towards the prestart fan speed. When the air pressure switch closes, the 25 second pre-purge time is started. After the pre-purge, the blower is driven to the ignition speed.

7. A trial for ignition begins. The sequence of events is illustrated graphically below.

8. After ignition, the fan may be driven to low fire before the boiler is released to modulation.

9. The control modulates the firing rate between low and high fire to maintain the desired outlet water temperature.

10. The burner will continue firing until the outlet water temperature reaches set point plus hysteresis (Off Differential). At this temperature the fuel supply is shut off and the combustion air fan continues to run for a 30 second post-purge.

11. When the water temperature is reduced by the load on the system, a heat request is generated. The operating sequence will recycle to step 4.

Ignition Sequence Timing

Fan

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Gas Valve

Spark

01234567

Seconds

NOTICE! Once the boiler begins the ignition sequence, the firing sequence will continue until main flame is reached regardless of heat request. The sequence can be interrupted by turning the power switch off.

5.6 T

correcting the cause. (Manual Reset Limits include: Flame safeguard, high or low gas pressure, high temperature limit, stack temperature.)

5.6.1 Loss of Power

In the event of loss of power, the entire boiler system is de-energized, closing all automatic valves and halting all boiler operations. When power is restored the sequence of operation will resume at Step 3, provided that all the limits are satisfied.

5.6.2 Loss of Water Flow

When there is insufficient water flow to close the flow switch, the burner operation is interrupted and the control displays LOW FLOW / ILK. When water flow is re-established, the sequence returns to Step 3, provided that the other limits are satisfied. This error also indicates that the interlock jumper is removed or the interlock is wired to an open device.

ROUBLESHOOTING

If any “Manual Reset” limit device trips, DO NOT RESET without determining and

Flame Detection

Flame must be detected at T = 6 seconds

5.6.3 Low Gas Pressure

The low gas pressure switch opens when there is insufficient gas pressure available for proper operation of the boiler. LOW GAS PRESSURE is displayed, and burner operation is interrupted. If a gas-supply shut-off valve is closed for any reason, a low gas condition will result. When gas pressure is restored, LOW GAS PRESSURE will remain on the display panel. A manual reset is required to restart the boiler, provided that all other limits are satisfied.

5.6.4 High Gas Pressure

The high gas pressure switch opens when there is excessive manifold gas pressure for the proper operation of the boiler. HIGH GAS PRESSURE is displayed and the burner operation is interrupted. When proper gas manifold pressure is restored, HIGH GAS PRESSURE remains on the display panel. A manual reset is required to restart the boiler, provided that all other limits are satisfied.

5.6.5 High Water Temperature

When the boiler water has exceeded both the operating and high-limit temperature the high limit switch opens, and HIGH LIMIT is shown on the display. When the water temperature falls below the high-limit temperature, the boiler will remain locked out until the water high limit switch is manually reset and the front panel reset button is pressed. Once the switch and the control are reset, the sequence returns to Step 3 to await heat demand provided that the other limits are satisfied.

5.6.6 Low Air

The air switch has been factory set and should not be adjusted in the field.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

If the display panel indicates AIR SWITCH NOT OPEN or AIR SWITCH NOT CLOSE this indicates improper airflow through the boiler. Check the hoses leading to the air switches. Verify proper blower operation. An air switch error does not necessarily mean that the air switch is defective.

When AIR SWITCH NOT OPEN is shown on the display, check that the air switch is open when the fan is off. Check that there is no air flow through the boiler when the fan is off.

When AIR SWITCH NOT CLOSE is shown on the display, check that the air switch is closed when the fan is running. If the air switch does not close within 5 minutes during purge, the boiler locks out. Check that the burner is clean and that there are no obstructions to airflow in the intake or exhaust ducts.

5.6.7 Vent Pressure

BLOCKED FLUE indicates that the high exhaust back pressure switch has tripped. This may be caused by a blocked stack, a blocked air inlet, or a blocked condensate system. When the blockage is removed, the boiler will automatically restart.

5.6.8 Ignition Failure

In the event the flame is not detected by the UV scanner during the 4 second trial-for-ignition period (Step 9), the gas valve and spark ignition are de-energized. At this time a safety lockout occurs. A manual reset of the programmer (located inside the control panel) is required.

5.6.9 Flame Failure

In the event of a flame failure, the main fuel valves are de-energized and a manual reset lockout occurs. IGNITION ERROR or FLAME ERROR is shown on the display. The cause of flame failure must be diagnosed and repaired before the control is reset.

When IGNITION ERROR is shown on the display, the boiler has not lit during a trial for ignition. Check that the spark, electrode, ignition wire, and gas valve are functioning properly.

When FLAME ERROR is shown on the display, the boiler has lost the flame during run. Check that the combustion is setup properly, the gas pressure is correct, as well as other combustion parameters.

5.6.10 Flame Error

LATE FLAME EARLY FLAME

FALSE FLAME

These errors signify flame error. This may be caused by a failed or leaky gas valve or a flame detector malfunction. If gas valve leakage is suspected, the unit must be isolated by turning off the main gas supply line. Qualified and knowledgeable service personnel must be called to evaluate and repair/replace the failed parts.

A comprehensive listing of the locking and blocking error codes is provided below.

NOTICE! When an Internal Software Error occurs, the failure is internal to the ENVI placement of the ENVI® control is required. A qualified service technician must replace the ENVI® control.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

boiler control and re-

5.7 MANUAL RESET ERROR CODES – A##

A Code Error Int. nr Description

A01 A02 A03

A05

A06

A09 A09 A09 A09 A09 A10 A12 A13 A14 A15 A16 A18 A19 A20 A30 A31 A32

A33

A34

A35

A37 A38 A39 A40 A41 A43

A44

IGNIT ERROR TOO MANY FLAME FAILURES T MAX LOCK ERROR

GV RELAY ERROR

SAFTEY RELAY ERROR

RAM ERROR FLAG BYTE INTEGRITY ERROR AD HI CPL ERROR AD LO CPL ERROR REGISTER ERROR E2PROM ERROR WRONG EEPROM SIGNATURE STATE ERROR ROM ERROR 15MS XRL ERROR 20 MS XLR ERROR STACK ERROR FLAME OUT TOO LATE ERROR FLAME ERROR I HIGH GAS PRESSURE ERROR LOW GAS PRESSURE ERROR 41MS ERROR

FAN ERROR

AIR PRESS SW NOT OPEN ERROR AIR PRESS SW NOT CLOSED ER-

ROR UV SENSOR BROKEN

MOD BACK DIFF ERROR RAPID RISE ERROR LOCK RET RAPID RISE ERROR LOCK FLOW RAPID RISE ERROR LOCK HX LOW WATER CUTOFF ERROR

FLAME CKT ERROR

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

1 Three unsuccessful ignition attempts in a row 24 Three times flame was lost during on demand 18 Overheat stat is open

9 Internal software error 27 Internal software error 28 Internal software error 29 Internal software error 33 Internal software error 12 No communication with E2prom 10 Contents of Eprom is not up-to-date 13 Internal software error 14 Internal software error 16 Internal software error 22 Internal software error 19 Internal software error 20 Flame still present 10 sec. after closing the gas valve 21 Flame detected just before gas valve opened 32 Gas pressure is to high 31 Gas pressure is to low 23 Internal software issue

25 Air pressure switch doesn’t open within 30 seconds

26 Air pressure switch doesn’t close within 30 seconds

11 UV scanner not functioning 4 Large difference between return and flow temperatures 15 Return temperature rise too rapidly 7 Flow temperature rise to rapidly 17 Heat exchanger rise to rapidly 30 Water pressure is to low

Problems with gas valve relay= internal hardware error (pump not running)

Problems with gas valve relay = internal hardware error (pump not running)

Fan deviation more than300 rpm longer than 1 minute (when fan speed > 4200 rpm this error is ignored)

Ionization (flame rod)wire lost for more than 15 seconds

5.8 AUTO-RESET ERROR CODES – E##

ENVI

Code

E01 E02 E03 E04 E05 E06 E11 E12 E13 E14 E15 E16 E18 E19 E20 E21 E22

E23

E24 E30 E32 E34 E41 E42 E44 E45 E46 E47 E48

E 49

E50 E51 E52 E54

Control Display

T FLOW OPEN T RETURN OPEN T FLUE OPEN T DHW OPEN T HX OPEN HEADER SENSOR OPEN T FLOW SHORTED T RETURN SHORTED T FLUE SHORTED T DHW SHORTED T HX SHORTED HEADER SENSOR SHORTED PHASE ERROR E2PROM READ ERROR FLAME ERROR 2 LOW FLOW/ILK WD 50HZ ERROR

NET FREQ ERROR

FAULTY EARTH ERROR FLUE GAS ERROR RETURN TEMP ERROR BLOCKED FLUE ERROR REVERSE FLOW ERROR WD COMMUNICATION ERROR FLAME CKT FAULT REFHI TOO LO ERROR REFHI TOO HI ERROR REFLO TOO LO ERROR REFLO TOO HI ERROR RAPID RISE HX ERROR BLOCK RAPID RISE ERROR BLOCK RESET BUTTON ERROR APPLIANCE SELECTION ERROR IF COMMUNICATION FAILURE

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Lockout

53 Flow sensor not connected 54 Return sensor not connected 59 Flue sensor not connected 57 DHW sensor not connected 58 Heat exchanger sensor not connected 70 Header sensor on IF board not connected 61 Flow sensor shorted 62 Return sensor shorted 67 Flue sensor shorted 65 DHW sensor shorted 66 Heat exchanger sensor shorted 71 Header sensor on IF board shorted 46 Phase and neutral of supply voltage mains are reversed 0 Problems from reading from or writing to E2prom 74 False flame detected 73 Low flow or interlock error 45 No earth ground connected or internal hardware error

48 Faulty earth ground to boiler 39 Flue gas sensor is above setpoint plus differential 42 Return temperature is above 90 degrees 41 Flue gas outlet is restricted or blocked 43 Supply and return temp are reversed 49 Internal hardware error 40 Ionization or flame rod wire is lost 35 Internal hardware error 36 37 38 Internal hardware error 51 Heat exchanger temperature rise to rapidly (blocking) 72 Flow temperature rise too rapidly (blocking) 68 Reset button pressed more than 7 times within 1 minute 50 Appliance and resistor do not match at start up 69 No communication with interface board

Description

Main supply voltage frequency differs more than 2% from 60HZ

Internal hardware error Internal hardware error

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

6 PARTS/TECHNICAL SUPPORT

Spare parts and replacement parts can be ordered from your local representative or Harsco Industrial, PattersonKelley by calling (877) 728-5351. The fax number is (570) 476-7247. Refer to the parts list shown on the assembly drawing provided with this manual. Factory direct replacement parts must be used to ensure that the boiler operates correctly.

Use of Non-Factory-Authorized replacement parts are not recommended for this equipment. All control components are engineered for safety and are designed to work in unison with each of the other components. Use of non-factory-authorized replacement parts would jeopardize the functionality of the safety features as well as the performance of the boiler.

Technical information is also available at the above number or at the Harsco Industrial, Patterson-Kelley website

www.harscopk.com

your boiler available.

6.1 S Typical schem atic drawings are shown on the following pages. Drawings specific to your particular

boiler can be supplied by your local Harsco Industrial, Patterson-Kelley representative.

CHEMATIC DIAGRAMS

. When ordering replacement parts please have the model number and serial number of

6.1.1 High Voltage Terminal Block Assignments (HV) Terminal Number

1 L1 208-240 VAC Boiler Supply Power, 230 VAC, 1 ph , 60 Hz

2 L2 208-240 VAC Boiler Supply Power, 230 VAC, 1 ph , 60 Hz 3 N 208-240V Boiler Neutral Line

4 120VAC Switched Output Neutral Line for 120VAC Switched Output

5 120VAC Switched Output Neutral Line for 120VAC Switched Output 6 3 Way Valve Neutral Line for 3 Way Valve

7 DHW Pump Relay Neutral Line for DHW Pump Relay

8 Circ Pump Relay Neutral Line for Circ Pump Relay 9 Damper Relay Neutral Line for Damper Relay

10 G 208-240 VAC Boiler Ground

11 G 208-240 VAC Boiler Ground 12 120VAC Switched Output 120VAC Output when boiler power is switched ON

13 120VAC Switched Output 120VAC Output when boiler power is switched ON

14 3 Way Valve 120 VAC 3 Way Valve, De-energized when DHW

15 DHW Pump Relay 120 VAC Output when DHW is enabled.

16 Circ Pump Relay 120 VAC Output when Central Heating is enabled

17 Damper Relay 120 VAC Output when Boiler is ready to start 18 Master Alarm Relay Contacts close when boiler is in alarm state

19 20 Flame Detected Relay Contacts close when boiler is firing

Label Description

enabled, Valve is Normally set to Heating Loop

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

6.1.2 Terminal Block Assignments – Low Voltage Circuit (TB1) Terminal

Number

1 Enable / Disable Boiler Enable, Contact Closure. 2 3 Auxiliary Low Water Cutoff External Limit, Contact Closure. 4 5 External Interlock External Limit, Contact Closure. 6 7 Outdoor Temp Sensor Outdoor Temperature Sensor Circuit 8

9 DHW Stat or Sensor Domestic Hot Water Thermostat (contact closure) or 10 11 Header Temp Sensor 12 13 DHW Flow Switch 14 15 0-10V Analog Input 0-10VDC Remote Control Input 16 0V Analog Input 0VDC Remote Control Common 17 For Future Use 18 For Future Use 19 MODBUS® COM 1A 20 MODBUS® COM 1B 21 CASCADE A TO A 22 CASCADE B TO B

Label Description

DO NOT ENERGIZE.

Temperature Sensor

Header Temperature Sensor

DHW Flow Switch (contact closure)

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

6.1.3 Wiring Schematic

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

6.1.4 Control Panel Components

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

ENVI®Control Panel

Mark Description

1 Air Switch 2 Circuit Breaker 3 On-Off Switch 4 ENVI® Control Display 5 High Limit 6 ENVI® Control Main Board 7 ENVI® Control Interface Board 8 Blower Fuses 9 Ignition Transformer

6.1.5 Control Panel Wiring

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Menu Back Enter

Flame

Enable

Down

Reset

Alarm

6.1.6 Rear Junction Box

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

6.1.7 Customer Connections

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

6.1.8 Gas Train

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Mark Description

1 Main Gas Shutoff

Valve

2 Low Gas Pressure

Switch

3 Leak Test Ports

4 Automatic Dual

Gas Valve

5 Solenoid Coils

6 High Gas

Pressure Switch

7 Secondary Gas

Shutoff Valve

8 Air Gas Mixer

6.1.9 Blower/Burner/Ignition Assembly

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Mark Description

1 Burner

2 Burner Gasket

3 Mounting Plate

4 Transition Piece Gasket

5 Transition Piece

6 Blower Gasket

7 Blower w/Motor

8 Air/Gas Mixer Gasket

9 Air/Gas Mixer

10 Ignition Gasket

11 Ignition Electrode

12 UV Scanner

13 Backpressure Switch

6.1.10 Heat Exchanger and Combustion Chamber

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Mark Description

1 Front Wrapper

2 Heat Exchanger

3 Gasket Set

4 Removable Top Head

6.1.11 Cabinet Assembly

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Mark Description

1 Front Door

2 Side Covers

3 Top Cover

4 Control Panel

5 Relief Valve

6 Flow Switch

7 Low Water Cutoff Switch

(optional)

8 Air Inlet Assembly

9 Electrical Junction Box

7 LIMITED WARRANTY

Subject to the terms and conditions herein, Harsco Industrial, Patterson-Kelley, Seller warrants to the original owner at the original installation site that products manufactured by Seller will be free from defects in materials and workmanship for a period of one (1) years from date of start up (the "Warranty Period"), provided that startup is completed within six months from the date of shipment. The heat exchanger and burner will be warranted for a period of five (5) years from the date of shipment (the “Warranty Period”).

REMEDY

The sole remedy of this warranty is expressly limited to the repair or replacement of any part found to be defective under conditions of normal use within the Warranty Period. Installation is not included.

WARRANTY The owner must notify the original installer of the Product and Seller (Attention: Harsco Industrial, Patterson-Kelley, 100 Burson Street, East Stroudsburg, PA 18301), in writing, within the Warranty Period, providing a detailed description of all claimed defects. Transportation to the factory or other designated facility for repairs of any products or items alleged defective shall, in all events, be the responsibility and at the cost of the owner.

EXCLUSIONS Seller shall have no liability for and this warranty does not cover: A. Incidental, special or consequential damages, such as loss of the use of products, facilities or production, inconvenience,

loss of time or labor expense involved in repairing or replacing the alleged defective Product.

B. The performance of any Product under conditions varying materially from those under which such Product is usually test-

ed under industry standards at of the time of shipment.

C. Any damage to the Product due to abrasion, erosion, corrosion, deterioration, abnormal temperatures or the influence of

foreign matter or energy.

D. The design or operation of owner's plant or equipment or of any facility or system of which any Product may be made a

part. E. The suitability of any Product for any particular application. F. Any failure resulting from misuse, modification not authorized by Seller in writing, improper installation or lack of or im-

proper maintenance. G. Equipment furnished by the owner, either mounted or unmounted, or when contracted for by the owner to be installed or

handled. H. Leakage or other malfunction caused by:

1. Defective installations in general and specifically, any installation which is made: a. in violation of applicable state or local plumbing housing or building codes, b. contrary to the written instructions furnished with the unit

2. Adverse local conditions in general and, specifically, sediment or lime precipitation in the tubes and/or headers or corrosive elements in the atmosphere.

3. Misuse in general and, specifically, operation and maintenance contrary to the written instructions furnished with the unit, disconnection, alteration or addition of components or apparatus, not approved by Seller, operation with fuels or settings other than those set forth on the rating plate or accidental or exterior damage.

I. Production of noise, odors, discoloration or rusty water. J. Damage to surrounding area or property caused by leakage or malfunction. K. Costs associated with the replacement and/or repair of the unit including: any freight, shipping or delivery charges, any

removal, installation or reinstallation charges, any material and/or permits required for installation, reinstallation or repair, charges to return the boiler and or components. Seller's liability under this warranty shall not in any case exceed the amount paid for the Product found to be defective.

THIRD PARTY WARRANTIES For goods or components not manufactured by Seller, the warranty obligations of Seller shall, in all respects, conform and be limited to one (1) year from the date of shipment.

SEVERABILITY To the extent that any provision of this warranty would be void or prohibited under applicable law, such provisions shall be limited in effect to the minimum extent necessary to render the remaining provisions hereof enforceable.

NO OTHER WARRANTIES Seller makes no implied warranty of merchantability or fitness for a particular purpose or other warranties with respect to any products or services except as expressly set forth in this limited warranty.

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

8 MODU-FIRE® FORCED DRAFT BOILER FIRE TEST REPORT

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

MODU-FIRE

Boiler Serial #: Model#:

Installation Name: City:

Installer Name:

1. Factory Fire-Test: (copy from boiler label) 2. Sealed Combustion: YES orNO

Inlet Gas "w.c. "w.c. 2b. Approximate Elevation: Ft.

Oxygen (O2) % % 3. Water Inlet Temperature: ° F

Carbon Dioxide (CO2) % % 4. Water Outlet Temperature: ° F

Carbon Monoxide (CO) ppm ppm Stack Temperature ° F ° F 5a. Glycol ? YES o Main Flame Signal Yes/No Yes/No 6. Operating Temperature Setpoint: ° F

Inlet AirTemperature ° F ° F

Start-Up Field Test: DATE: 9. Stack Pressure (measured where stack exits boiler):

"w.c. "w.c. "w.c. (Low)

Inlet Gas

Oxygen (O2) % % 10. Electrical Supply Power: L1 to L2 Volts Carbon Dioxide (CO2) % % L1 to N Volts Carbon Monoxide (CO) ppm ppm Less than 1 volt between neutral and ground: YES or NO

Stack Temperature (net) ° F ° F 11. Total Cycles:

Main Flame Signal Yes/No Yes/No 12. Total Hours:

Inlet Air Temperature

14. Condensate drain from boiler connected to stack drain with Stainless Steel or High-Temp (500

Performed by:

dditional Comments:

State: Zip: Phone:

High Low 2a. Combustion Air Temperature: ° F

High Low "w.c. (High)

° F ° F 13. Any Faults? Describe with

FORCED DRAFT BOILER

START-UP REPORT

Type of Installation:

ddress:

Contact:

Date:

5. Water Flow:

(from internal OR external control)

7. Gas Valve a. Low Fire Setting (N)

8. Approximate Stack Lengths:

code, time and description:

F) Silicon piping or tubing, and then trapped: YES or NO

b. High Fire Setting (V)

Ft. Horizontal

Ft. Vertical

Flue Pipe Diamete

gpm

Please return a copy to Harsco Industrial, Patterson-Kelley, ATTN: Boiler Technical Service Harsco Industrial, Patterson-Kelley 100 Burson Street · E. Stroudsburg, PA 18301 Phone: (570) 476-7261 Fax: (570) 476-7247 www.harscopk.com

MODU-FIRE® Forced Draft Gas-Fired Boiler 2500-3000

Harsco Industrial 1004905923, MODU-FIRE 2500, MODU-FIRE 3000 Installation & Owner's Manual

Specifications and Main Features

Frequently Asked Questions

User Manual