Fig. 16: Connections
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 reconnect- ing the boiler and its manual shut off valve to the gas supply line. FAILURE TO FOLLOW THIS PROCE- DURE 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 Propane gas systems is recommended. Apply sparingly only on male pipe ends, leaving the 2 end threads bare.
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 in. WC and a maximum of 10.5 in. WC upstream gas pressure is required under load and no load conditions for natural gas. A minimum of 12 in. WC and a maximum of 13 in. WC is required for propane gas. The gas pressure regulator supplied is for low pressure service. If upstream pressure exceeds 14 in. WC, an intermediate gas pressure reg- ulator, of the dead lockup type, must be installed.
NOTE: The supply gas pressure must not fluctuate by more than +/- 1.0 in. WC. For fluctuating gas sup- ply 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.
Model |
| 2” NPT |
| 3” NPT | |
NPT | NPT | ||||
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| |||
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|
| |
751 | 65 | 200 | N/A | N/A | |
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|
| |
1001 | 35 | 125 | 200 | N/A | |
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|
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|
| |
1501 | 15 | 60 | 125 | 225 | |
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|
|
|
Maximum equivalent pipe length.
Natural gas 100 BTU/FT3 .60 specific gravity @.5 in. WC pressure drop.
Table I: Gas Pipe Sizing
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