PNEG-308 Purafire 47
13. Gas Pressure
Checking Gas Pressure
NOTE: All gas appliances must be running while checking gas pressures. Checking one appliance at a
time may result in false pressure readings if gas piping is undersized.
1. Turn the electrical and gas supplies to the heater OFF.
2. Using a 3/16" allen wrench, remove the plug from the gas valve and install a manometer. Reconnect
the electrical and gas supply to the heater and turn ON. Adjust regulator to the pressure listed on
the heater’s nameplate. If nameplate pressure cannot be obtained, contact the local gas company.
3. Turn the heater OFF. The incoming gas pressure at zero flow must be lower than 14" W.C. to
prevent the gas valve from pressure locking.
4. Repeat step 1, remove the manometer and replace the plug.
5. Using a 5/16" open-end wrench, remove plug from the gas valve inside the heater. Install the
manometer and reconnect the electrical and gas supply. Turn heater ON and observe the
manometer’s reading. If it is more than 5" W.C. less than the reading taken in step 2, replace the
gas valve.
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