Raypak 1000CHX Installation Manual

OPERATING AND INSTALLATION INSTRUCTIONS

Models 500,750,1000

ADVANCED DESIGN

Catalog No.: 3400.50-I Effective: 12-01-00 Replaces: 05-01-00

BOILER

FOR YOUR SAFETY

Do not store or use gasoline or other flammable vapors and liquids or other combustible materials in the vicinity of this or any other appliance. To do so may result in an explosion or fire.

WARNING: Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Refer to the user’s information manual provided with this boiler. Installation and service must be performed by a qualified installer, service agency or the gas supplier.

FOR YOUR SAFETY

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.

This manual should be maintained in legible condition and kept adjacent to the boiler or kept in a safe place for future reference.

P/N 240723

DANGER: Make sure the gas on which the boiler will operate is the same type as that specified on the

boiler model and rating plate.

WARNING: Should overheating occur or the gas supply valve fail to shut, do not turn off or disconnect the

electrical supply to the boiler. Instead, shut off the gas supply at a location external to the appliance.

WARNING: Do not use this boiler if any part has been under water. Immediately call a qualified service technician

to inspect the boiler and to replace any part of the control system and any gas control which has been under water.

WARNING: To minimize the possibility of improper operation, serious personal injury, fire, or damage to the boiler,

never violate the following safety rules:

1. Always keep the area around the boiler free of combustible materials, gasoline, and other flammable liquids and vapors.

2. Never cover the boiler, lean anything against it, store trash or debris near it, stand on it, or in any way block the flow of fresh air to the boiler.

WARNING: More than one (1) supply source. This appliance has provisions to be connected to more than one (1)

supply source. To reduce the risk of electrical shock, disconnect all such connections before servicing.

WARNING: Risk of electrical shock. More than one (1) disconnect switch may be required to de-energize the

equipment before servicing.

CAUTION: Operation of this boiler on low temperature systems requires special piping to insure correct

operation. Consult Sections E, F or G for piping details.

CAUTION: If this boiler is to be installed above radiation level, it must be provided with a low water cutoff device

at the time of boiler installation.

CAUTION: This boiler requires forced water circulation when the burner is operating. See sections D for minimum

and maximum flow rates. Severe damage will occur if the boiler is operated without proper water flow circulation.

TABLE OF CONTENTS

PAGE NO.

4 SECTION A: BEFORE INSTALLING THE BOILER

7 SECTION B: BOILER INSTALLATION

10 SECTION C: COMBUSTION AND VENTILATION AIR

12 SECTION D: WATER PIPING - GENERAL

13 SECTION E: HYDRONIC HEATING PIPING

17 SECTION F: DOMESTIC HOT WATER PIPING

19 SECTION G: POOL HEATING

22 SECTION H: GAS SUPPLY CONNECTIONS

24 SECTION I: ELECTRICAL POWER CONNECTIONS

27 SECTION J: VENTING CONNECTIONS

49 SECTION K: CONDENSATE DRAIN

50 SECTION L: CONTROLS

56 SECTION M: GENERAL SAFETY PRECAUTIONS

57 SECTION N: PRE-START-UP

59 SECTION O: ADB INITIAL START-UP

(MANUFACTURERS CERTIFIED PERSONNEL ONLY)

62 SECTION P: POST START-UP CHECK

63 SECTION Q: OPERATION

64 SECTION R: MAINTENANCE

66 SECTION S: CONNECTING CONDENSING HEAT EXCHANGER (CHX)

67 APPENDIX A: COMBUSTION AIR CONTAMINATION

68 ILLUSTRATED PARTS LIST

Pay attention to these terms:

DANGER indicates the presence of immediate hazards which will cause severe personal injury, death or

substantial property damage if ignored.

WARNING indicates the presence of hazards or unsafe practices which could cause severe personal injury,

death or substantial property damage if ignored.

CAUTION indicates the presence of hazards or unsafe practices which could cause minor personal injury or

product or property damage if ignored.

NOTICE indicates special instructions on installation, operation, or maintenance which are important but

not related to personal injury hazards.

SECTION A: BEFORE INSTALLING THE BOILER

Raypak strongly recommends that this manual be reviewed thoroughly before installing your Raypak boiler. Factory warranty does not apply to boilers that have been improperly installed or operated. Installation and service must be performed by a qualified installer, service agency or gas supplier. If, after reviewing this manual, you still have questions which this manual does not answer, please contact the factory or your local Raypak representative.

Thank you for purchasing a Raypak product. We hope you will be satisfied with the high quality and durability of our equipment.

PRODUCT RECEIPT

On receipt of your product it is suggested that you visually check for external damage to the shipping crate. If the crate is damaged, make a note to that effect on the Bill of Lading when signing for the shipment. Remove the boiler from the shipping packaging. Report any damage to the carrier immediately.

On occasion, some items will be shipped loose. Be sure that you receive the correct number of packages as indicated on the Bill of Lading.

Claims for shortages and damages must be filed with the carrier by consignee. Permission to return goods must be received from the factory prior to shipping. Goods returned to the factory without an authorized Returned Goods Receipt number will not be accepted. All returned goods are subject to a stocking charge.

When ordering parts, you must specify the Model and Serial Number of the boiler. When ordering under warranty conditions, you must also specify the date of installation.

Purchased parts are subject to replacement only under the manufacturer’s warranty. Debits for defective replacement parts will not be accepted and will be replaced in kind only per Raypak’s standard warranties.

MODEL IDENTIFICATION

The model identification number and boiler serial number are found on the boiler data plate located on the left inside jacket of the boiler. The model number will have the form H4 0500A ADB or similar depending on the boiler size and configuration. The first character of the model number identifies application (H = Hydronic Heating System, W = Hot Water Supply System, P = Pool Application). The second character identifies the firing mode (4 = On-Off firing). The next four places identify the input of the boiler in 1,000s of BTUH 0500 = 500,000 BTUH). The remaining suffix identifies the control, ignition, and construction configuration. The last three characters of the model number identifies the model type (ADB = Advanced Design Boiler).

RATINGS AND CERTIFICATION

All Raypak boilers are National Board Approved, design certified and tested under the applicable American National Standard/CSA Standard for USA and Canada. Each boiler is constructed in accordance with Section IV of the American Society of Mechanical Engineers (ASME) Boiler Pressure Vessel Code and bears the ASME stamp. This boiler complies with the latest edition of ASHRAE 90.1 Standard.

Altering any RAYPAK pressure vessel by installing replacement heat-exchangers, tube bundle headers, or any other ASME part not manufactured and/or approved by RAYPAK will instantly void the ASME, and agency listings and any RAYPAK warranty on the vessel. Altering the ASME, agency ratings of the vessel also violates national, state, and local approval codes. The terms "boiler" and "heater" are used interchangeably in this manual.

No derate is required for altitudes up to 7000 feet. Rated inputs, at sea level settings, are suitable for up to 5000 feet elevation. At altitudes between 5000 and 7000 feet, rated inputs are achieved with pressure settings adjustment. Consult the factory for installations at altitudes in excess of 7000 feet.

Figure A-1 ADVANCED DESIGN BOILER COMPONENT LOCATIONS

SECTION B: BOILER INSTALLATION

INSTALLATION CODES

Installations must follow these codes:

· Local, state, provincial, and national codes, laws, regulations and ordinances.

· National Fuel Gas Code (NFGC), ANSI Z223.1- latest edition.

· National Electrical Code (NEC), ANSI/NFPA 70 - latest edition.

· Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME CSD-1, when required.

· For Canada only: CAN/CGA B149.1 and .2 Installation Code and C.S.A. C22. 1 C.E.C. Part 1.

EQUIPMENT BASE

The boiler should be mounted on a level, structurally sound surface. The boiler is approved for and can be installed on a combustible surface but must NEVER be installed on carpeting. Gas fueled equipment installed in enclosed parking garages must be located at least 18 inches above the floor.

CAUTION: The boiler should be located in an area where water leakage will not result in damage to the

area adjacent to the appliance or to the structure. When such locations cannot be avoided, it is recommended that a suitable catch pan, adequately drained, be installed under the appliance. The pan must not restrict air flow.

In addition, the boiler shall be installed such that the gas ignition system components are protected from water (dripping, spraying, rain, etc.) during appliance operation and service (circulator replacement, control replacement, etc.).

CLEARANCES

TABLE 1 MINIMUM CLEARANCES FROM COMBUSTIBLE SURFACES (INDOOR ALCOVE INSTALLATIONS)

Boiler Size Boiler Side 500 750 1000 Floor See Note 1. Rear 1” 1" 1" Right 12” (Water side) 12" (Water side) 12" (Water side) Left 1” 1” 1” Top 0” 0” 0” Vent 1” 1” 1”

Note 1. Do not install on carpeting.

Figure B-1 MINIMUM CLEARANCES FROM COMBUSTIBLE SURFACES AND FOR EASY SERVICING

Raypak Advanced Design Boilers are design certified by AGA/CGA for outdoor installation. Roof water drainage must be diverted away from boilers installed under overhangs.

TABLE 2 OUTDOOR INSTALLATION MINIMUM CLEARANCES

Boiler Size Boiler Side 500 750 1000 Rear 6" 6" 6" Right 36” (Water side) 36" (Water side) 36" (Water side) Left 36" 36" 36" Top 0" 0" 0" Vent 1" 1" 1"

WARNING: Combustion air inlet (blower air inlet) should have 6" minimum clearance from any obstruction, i.e. walls or

other appliances.

SECTION C: COMBUSTION AND VENTILATION AIR

COMBUSTION AND VENTILATION AIR (Indoor Units)

The boiler must be supplied with sufficient quantities of non-contaminated air to support proper combustion and equipment ventilation. Combustion air can be supplied via conventional venting, where combustion air is drawn from the area immediately surrounding the boiler, or via direct vent, where combustion air is drawn directly from outside. All installations must comply with the requirements of NFGC for U.S., CAN/CGA B 149.1 and .2 for Canada, and all local codes.

DIRECT COMBUSTION AIR

If outside air is drawn through a vent pipe directly to the unit for combustion:

1. Install combustion air direct vent in accordance with Section J of this manual.

2. Provide for adequate ventillation of the space occupied by the boiler(s) by an opening(s) for ventillation air at the highest practical point communicating with the outdoors. The total cross sectional area shall be at least one (1) square inch of free area per 20,000 BTUH of total input rating of all equipment in the room when the opening is communicating directly with the outdoors or through vertical duct(s). The total cross sectional area shall be at least one (1) square inch of free area per 10,000 BTUH of total input rating of all equipment in the room when the opening is communicating with the outdoors through horizontal duct(s).

3. In cold climates, and to mitigate potential freeze-up, Raypak highly recommends the installation of a motorized sealed damper to prevent the circulation of cold air through the boiler during the non-operating hours.

CONVENTIONAL COMBUSTION AIR SUPPLY (FOR U.S. INSTALLATION ONLY)

All Air from Inside the Building. If all combustion air is drawn from the air inside the building (the mechanical

equipment room does not receive air from outside):

1. The mechanical equipment room must be provided with two permanent openings communicating directly with additional room(s) of sufficient volume so that the combined volume of all spaces meets the criteria for an unconfined space. (An unconfined space is defined as a space whose volume is more than 50 cubic feet per 1,000 BTUH of the aggregate input rating of all appliances installed in that space.)

2. Each opening must have a minimum free area of one (1) square inch per 1,000 BTUH of the total input rating of all gas utilization equipment in the mechanical equipment room.

3. One opening must commence within twelve (12) inches of the top, and one opening must commence within twelve (12) inches of the bottom of the room.

4. Refer to NFGC, Part 5, for additional information.

All Air from Outdoors. If all combustion air is drawn from the air outside the building (the mechanical equipment room directly communicates with the outdoors), either of the following two methods can be used:

Method 1:

1. The mechanical equipment room must be provided with two permanent openings, one commencing within (twelve) 12 inches of the top, and one commencing within twelve (12) inches of the bottom of the room.

2. The openings must communicate directly, or by ducts, with the outdoors.

3. Each opening must have a minimum free area of one (1) square inch per 4,000 BTUH of total input rating of all equipment in the room when the opening is communicating directly with the outdoors or through vertical ducts. The minimum free area required for horizontal ducts is one (1) square inch per 2,000 BTUH of total input rating to all the equipment in the room.

4. Refer to NFGC, Part 5, for additional information.

Refer to Appendix A for additional information about combustion air quality.

Method 2 (normally applied in cold climate regions):

1. The mechanical equipment room must be provided with at least one permanent opening, commencing within

12 inches of the top of the enclosure.

2. The opening must communicate directly or by ducts with outdoors.

3. The opening must have a minimum free area of 1 sq. in per 3000 BTUH of the total input rating of all

equipment in the room, or no less than the sum of the areas of all vent connectors in the confined space.

. Refer to the latest version of NFGC, part 5 for additional information.

WARNING: Do not use one permanent opening method (Method 2) if the equipment room is under negative

pressure condition or the equipment is common vented with other gas-fired appliances.

COMBUSTION AND VENTILATION AIR SUPPLY (FOR CANADA INSTALLATION)

CAUTION: All combustion air has to be drawn from the air outside the building (the mechanical equipment

room directly communicates with the outdoors).

1. Ventilation of the space occupied by the boiler shall be provided by an opening(s) for ventilation air at the

highest practical point communicating with outdoors. The total cross-sectional area of such an opening(s) shall be at least 10% of the area required in (2) and (3), but in no case shall the cross-sectional area be less than 10 square inches (6500 square mm).

2. When air supply is provided by natural air flow from the outdoors for natural draft, partial fan assisted, fan-assisted

or power draft-assisted burners, there shall be a permanent air supply opening(s) having a cross section area of not less than 1 sq. in. per 7000 BTUH (310 sq. mm per kW) up to and including 1 million BTUH, plus 1 sq. in. per 14000 BTUH (155 sq. mm per kW) in excess of 1 million BTUH. This opening(s) shall be either located at or ducted to a point neither more than 18 inches (450 mm) nor less than 6 inches (150 mm) above the floor level. The duct can also "Goose Neck" through the roof. The duct is preferred straight down 18" from floor, but do not place near piping. This air supply opening requirement shall be in addition to the air opening for ventilation air required in (1).

3. When air supply is provided by natural air flow from outdoors for a power burner and there is no draft regulator, draft

hood or similar flue gas dilution device installed in the same space, in addition to the opening for ventilation air required in (1), there shall be a permanent air supply opening(s) having a total cross-sectional area of not less than 1 sq. in. for each 30,000 BTUH (70 sq. mm per kW) of total rated input of the burner(s), and the location of the opening(s) shall not interfere with the intended purpose of the opening(s) for ventilation air referred to (1). This opening(s) can be ducted to a point neither more than 18 inches (450 mm) nor less than 6 inches (150 mm) above the floor level. The duct can also "Goose Neck" through the roof. The duct is preferred to be straight down 18" from floor, but do not place near piping.

4. Refer to the latest version of CAN/CGA-B149.1 and B149.2 for additional information.

SECTION D: WATER PIPING - GENERAL

The boiler should be located so that any water leaks will not cause damage to the adjacent area or structures.

All units should be plumbed in accordance with the appropriate diagram from Section E, F or G or per a suitable engineered piping arrangement.

CAUTION: This boiler requires forced water circulation when the burner is operating. See Table D-1 for

minimum and maximum flow rates and water pump selection. The pump must be interlocked with the boiler to prevent boiler operation without water circulation. See Figure L-2 Wiring Diagram and Figure L-1.

RELIEF VALVE PIPING

WARNING: Pressure relief valve discharge piping must be piped near the floor close to a floor drain to eliminate

the potential of severe burns. Do not pipe to any area where freezing could occur. Refer to local codes.

HYDROSTATIC TEST

Unlike many other types of boilers, Raypak boilers do not require hydrostatic testing prior to being placed in operation. The heat exchanger has already been factory-tested and is rated for 150 PSI operating pressure. However, Raypak does recommend hydrostatically testing the piping connections to the boiler and the rest of the system prior to operation. This is particularly true for hydronic systems using expensive glycol-based antifreeze. Raypak recommends conducting the hydrostatic test before connecting gas piping or electrical supply.

Leaks must be repaired at once to prevent damage to the boiler. NEVER use petroleum-based stop-leak compounds.

1. Connect fill water supply. Fill boiler with water (be sure bleed valve is open). When water flows from bleed valve, shut off water. Close bleed valve. Carefully fill the rest of the system, being sure to eliminate any entrapped air by using high point vents. Close feed valve. TEST AT standard operating pressure for at least 24 hours.

2. Make sure constant gauge pressure has been maintained throughout test.

3. Check for leaks. Repair if found.

LOW TEMPERATURE SYSTEM

Boiler requires minimum inlet temperature of 105°F. Consult sections E, F or G for piping details. (For Pool temperature

requirements, See Section G).

TEMPERATURE & PRESSURE GAUGE

The temperature and pressure gauge is factory-mounted in the inlet/outlet header.

Delta P Should include typical piping To/From a single tank as well as bypass piping.

NOTE: GPM flow rates limited by maximum acceptable velocity through heat exchanger tubes. May be

Table D-1 increased by 10% for closed heating systems. Pressure drop would increase by 21%.

SECTION E: HYDRONIC HEATING PIPING

PUMP SELECTION

In order to insure proper performance of your boiler system, you must install a properly sized pump. Raypak recommends using a 20°F Delta T as design Delta T. (Delta T is the temperature difference between the inlet and outlet water when the boiler is firing at full rate). If a Delta T larger than 20°F is necessary, the bypass must be installed and adjusted to insure proper hydraulics through the boiler while still allowing minimum flow to satisfy the safety flow switch. See Table D-1 for flow

rate requirements.

PRESSURE DROP IN FEET OF HEAD FEEDWATER REGULATOR

Raypak recommends that a feedwater regulator be installed and set at 12 PSIG minimum pressure at the highest point of system. Install a check valve or back flow device upstream of the regulator, with a manual shut off valve as required by local codes.

PIPING - HEATING BOILERS

All high points should be vented. Purge valves and a bypass valve should be installed. A boiler installed above radiation level must be provided with a low water cutoff device. The boiler, when used in connection with a refrigeration system, must be installed so the chilled medium is piped in parallel with the boiler with appropriate valves to prevent the chilled medium from entering the boiler.

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 circulating refrigerated air, must be equipped with flow control valves or other automatic means to prevent gravity circulation of the boiler water during the cooling cycle. It is highly recommended that the piping be insulated.

AIR-SEPARATION/EXPANSION TANK

All boilers should be equipped with a properly sized expansion tank with an air separation fitting as shown in the following diagrams.

THREE-WAY VALVES

Valves designed to blend water temperatures or reduce water circulation through the boiler should not be used. Raypak heaters are high recovery low mass heaters not subject to thermal shock. Raypak offers a full line of electric sequencers that produce direct reset of boiler water temperature. Refer to the Controls Section in our Complete Catalog.

Figure E-2a SINGLE BOILER - PRIMARY/SECONDARY PIPING

Figure E-2b SINGLE BOILER - PRIMARY/SECONDARY PIPING WITH CHX

Figure E-3a DUAL-BOILER PRIMARY/SECONDARY PIPING

Figure E-3b DUAL BOILER -PRIMARY/SECONDARY PIPING WITH CHX

Figure E-4a SINGLE BOILER - LOW TEMPERATURE APPLICATION (HEAT PUMP) PRIMARY/SECONDARY PIPING

SECTION F: DOMESTIC HOT WATER PIPING

When designing the water piping system for domestic water applications, water hardness should be considered. Table D1 indicates the suggested flow rates for soft, medium and hard water. Hardness is specified as grains per gallon.

TABLE F-1

DOMESTIC WATER HEATING BOILER

FLOW RATE REQUIREMENTS

Delta T = Temperature rise in °F GPM = Gallons per minute See Table D-1 for Pressure Drop

Figure F-1a SINGLE BOILER DOMESTIC HOT WATER WITH ONE STORAGE TANK

Figure F-1b SINGLE BOILER DOMESTIC HOT WATER WITH ONE STORAGE TANK AND CHX

Figure F-1bb SINGLE BOILER DOMESTIC HOT WATER WITH ONE STORAGE TANK AND CHX (2 pump system)

Figure F-1c SINGLE BOILER DOMESTIC HOT WATER WITH ONE STORAGE TANK, ONE PRE-HEAT TANK AND CHX

SECTION G: POOL HEATING

CAUTION: Power to the heater should be interlocked with the main system pump to make sure the heater does not fire

without the main system pump in operation. Improper flow control can damage the heater. Uncontrolled flow (too high) or restricted flow (too low) can seriously affect heater operation. Follow these instructions to make sure your heater is properly installed.

The ADB unit is equipped with an external pump and bypass arrangement that blends outlet water with the inlet to increase the inlet water temperature, thereby reducing the likelihood of condensation forming on the heat exchanger. The pump also serves to circulate water through the heater form the main system piping.

To complete the installation of the pool heater, the pool thermostat needs to be installed in the main return water line. This will insure that the heater will be energized at the right time. If the main water line is too far away from the heater and the capillary bulb will not reach it, locate the pool thermostat adjacent to the main line and run wires back to the heater. See Figure G1-a and Figure G2-b.

Adjustment of the bypass valve is critical to proper operation of the heater. The bypass valve should be adjusted to achieve an inlet water temperature in the range of 90°F to 100°F and an outlet water temperature between 120°F and 130°F. When starting with a cold pool, make initial adjustments. Make final adjustments when pool water approaches desired temperature. Refer to flow rate chart below:

AUTOMATIC CHLORINATORS AND CHEMICAL FEEDERS

All chemicals must be introduced and completely diluted into the pool or spa water before being circulated through the heater. Do not place chlorine tablets or bromine sticks in the skimmer. High chemical concentrations will result when the pump is not running (i.e. overnight).

Chlorinators must feed downstream of the heater and have an anti-siphoning device to prevent chemical backup into the heater when the pump is shut off.

NOTE: High chemical concentrates from feeders and chlorinators that are out of adjustment will cause very rapid

corrosion to the heat exchanger in the heater. Such damage is not covered under the warranty.

WINTERIZING YOUR HEATER

When heaters installed outdoors in freezing climate areas are to be shut down for the winter, please observe the following step-by-step procedure:

1. Turn off manual main gas and main gas shut off. Remove the drain plug or open the drain cock located on the bottom header.

SPA WATER CHEMISTRY

NOTE: Chemical imbalance can cause severe damage to your heater and associated equipment. Maintain your water

pH between 7.4 and 7.8 and total alkalinity between 100 and 150 p.p.m. If the mineral content and dissolved solids in the water become too high, scale forms inside the heat exchanger tubes, reducing heater efficiency and also damaging the heater. If the pH drops below 7.2, the heater will be severely damaged.

NOTE: Heat exchanger damage resulting from chemical imbalance is not covered under the warranty.

Figure G-1a SINGLE BOILER - POOL APPLICATION

Figure G-2b SINGLE BOILER - POOL APPLICATION WITH CHX

Figure G-3a DOUBLE BOILER - POOL APPLICATION

SECTION H: GAS SUPPLY CONNECTIONS

DANGER: Make sure the gas on which the boiler will operate is the same type as specified on the boiler

model and rating plate.

Gas piping must have a sediment trap ahead of the boiler gas controls, and a manual shut-off valve located outside the heater jacket. A pounds to inches regulator must be installed to reduce to gas supply pressure to under 14" W.C. The regulator should be placed a minimum distance of 10 times the pipe diameter upstream of the boiler gas controls. All gas piping must be tested after installation in accordance with local codes. The boiler and its gas connection must be leak-tested before placing it in operation.

Figure H-1 GAS SUPPLY CONNECTION

CAUTION: The boiler and its manual shutoff valve must be disconnected from the gas supply during any

pressure testing of the gas supply system at test pressures in excess of 1/2 PSIG (3.45 KPA). The boiler must be isolated from the gas supply piping system by closing the manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 PSIG. Relieve test pressure in the gas supply line before reconnecting the boiler and its manual shut off valve to the gas supply line. FAILURE TO FOLLOW THIS PROCEDURE MAY DAMAGE THE GAS VALVES. Over pressurized gas valves are not covered by warranty. The boiler and its gas connections shall be leak tested before placing the appliance in operation. Use soapy water for leak test: DO NOT use open flame.

CAUTION: Do not use Teflon tape on gas line pipe thread. A pipe compound rated for use with gas systems

is recommended. Apply sparingly only on male pipe ends.

CAUTION: Support gas supply piping with hangers, not by the boiler or its accessories. Ensure the gas

piping is protected from physical damage and freezing where required.

GAS SUPPLY PRESSURE

A minimum of 7” W.C. and a maximum of 14” W.C. upstream gas pressure is required under load and no load conditions

for natural gas. A minimum of 12” W.C. and a maximum of 14” W.C. is required for propane gas. The gas pressure regulator supplied is for low pressure service. If upstream pressure exceeds 14" W.C, an intermediate gas pressure

regulator, of the lockup type, must be installed.

NOTICE: For fluctuating gas supply contact the factory.

When connecting additional gas utilization equipment to the gas piping system, the existing piping must be checked to determine if it has adequate capacity

GAS PRESSURE REGULATOR

The gas pressure regulator is nominally preset to the outlet values shown in the table below, within +. 1" W.C. If an adjustment is needed, turn the adjustment screw clockwise to increase pressure or counterclockwise to lower pressure.

REGULATOR PRESSURE SETTINGS:

See Tables O-2 and O-3

for Pressure Settings.

(page 60)

VENTING OF DIAPHRAGM GAS COMPONENTS

Boilers have gas train components that have diaphragms in their construction that are supplied with a bleed line connection that must be connected to the outside atmosphere as required by NFGC or (for Canada) the B149 Installation Codes and applicable provisions of local codes. Under NO circumstances shall bleed lines terminate in the gas utilization equipment flue or exhaust system.

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