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.
Fig. #9226.1
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 on the boiler is for low pressure service.
If upstream pressure exceeds 14" W.C, an intermediate gas pressure
regulator, of the lockup type, must be installed.
When connecting additional gas utilization equipment to the gas piping system, the existing piping must be checked to
determine if it has adequate capacity.
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Summary of Contents for 302-902
Page 7: ...7 General Information ...
Page 49: ...49 WIRE DIAGRAM MODEL 302 402 Reference Drawing Number M152462 Rev M H4 W1 ...
Page 50: ...WIRE DIAGRAM MODEL 302 402 Reference Drawing Number M152470 Rev J H3 W3 50 ...
Page 51: ...51 WIRE DIAGRAM MODEL 502 752 Reference Drawing Number M152464 Rev R H3 HW3 ...
Page 52: ...WIRE DIAGRAM MODEL 902 Reference Drawing Number M152465 Rev P H3 W3 52 ...
