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Gas Piping Examples:
The following is a LP gas piping example for the single regulator system
Gas regulator (12" WC)
1/4"–3/8" pipe
Gas tank
Figure 22
G as regulator must be a minimum of 10 feet away from the boiler.
The following is an LP gas piping example for the 2-lb. system with multiple
regulators.
Gas regulator
2 PSI
(12" WC)
1/2"–3/8"
pipe
Gas tank
Figure 23
G as regulators must be a minimum of 10 feet away from the boiler.
Singular Combi Boiler - BTC 439003301 B (2021/07)
Full-size gas pipe
Full-size gas pipe
Full-size gas pipe
1/2" pipe
Full-size gas pipe
5.3 Inlet Gas Pressure
WARNING:
Inlet gas pressure should be measured by a licensed
professional only. The boiler cannot function properly
without sufficient inlet gas pressure.
The boiler must be isolated from the gas supply piping system during any
pressure testing of that system at test pressures equal to or more than 0.5
psig. If overpressure has occurred, through improper testing of the gas
lines or malfunction of the supply system, the gas valve must be checked
for safe operation.
The inlet gas pressure must be maintained between 3.5" and 10.5" WC for
natural gas and between 8" and 13" WC for liquefied propane.
To measure the inlet gas pressure:
1. Shut off the manual gas valve on the gas supply line.
Gas
Figure 24
2. Open a hot water faucet. The boiler should turn on and the gas in the gas
supply line will be purged.
3. Leave the faucet on until the boiler shuts down due to a lack of gas supply,
and then turn off the hot water faucet.
4. Remove the boiler front cover by loosening the 2 Phillips screws securing it
to the case.
Installation Instructions
| 27
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