GAS SUPPLY CONNECTIONS
Gas piping must have a sediment trap ahead of the heater gas controls, and a manual
Manual | Heater Jacket | |
Gas Valve | ||
Valve | ||
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Gas Inlet | Union |
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Sediment Trap
Fig. # 8090.0
CAUTION: The heater and its manual shut off valve must be disconnected from the gas supply during any pressure testing of that system at test pressures in excess of 1/2 psig (3.45 KPA). Dissipate test pressure in the gas supply line before reconnecting the heater and its manual shut off valve to gas supply line.
FAILURE TO FOLLOW THIS PROCEDURE MAY DAMAGE THE GAS VALVE. OVER PRESSURED GAS VALVES ARE NOT COVERED BY WARRANTY. The heater 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.
NOTE: Do not use teflon tape on gas line pipe thread. A flexible sealant is recommended.
A minimum of 7" W.C. and a maximum of 14" W.C. upstream pressure under load, and no load conditions must be provided for natural gas or a minimum of 12" W.C. and a maximum of 14" for propane gas.
GAS PRESSURE REGULATOR
The gas pressure regulator is present and sealed at 4"W.C. for natural gas, and 11"W.C. for propane gas. Between the gas valve and the burners is a 1/8" pipe plug. The pressure at this point , taken with a manometer, should be about 3.7"W.C. natural gas and 10.5"W.C. propane gas. If an adjustment is needed, remove seal and turn adjustment screw clockwise
to increase pressure or
Manometer
Gas Pressure
Test Upstream
Manual Shut
Off Valve
Gas Valve
Gas Pressure Test
at Gas Valve
Gas Pressure Test at Heater
Fig. # 8149.0
ROBERTSHAW VALVE
W. C. adjustment
HONEYWELL VALVE
W. C. adjustment
Fig. # 8081.0
PIPE SIZING FOR GAS CONNECTIONS
MAXIMUM EQUIVALENT PIPE LENGTH
Natural Gas 1000BTU/FT3 .60 Specific Gravity
@ 0.5" WC Pressure Drop
Propane Gas 2500BTU/FT3 1.53 Specific Gravity
@ 0.5" WC Pressure Drop
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| 3/4" |
| 1" |
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| P | N |
| P | N |
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155B | 15 |
| 35 | 60 |
| 145 | 200 |
| 500 |
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