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To measure the inlet gas pressure:
1. Shut off the manual gas valve on the gas supply line pipe.
Gas Valve
2. Open a hot water tap. The boiler should turn on and the gas
in the gas supply line will be purged.
3. Leave the tap on until the boiler shuts down due to a lack of
gas supply, and then turn off the hot water tap.
4. Unfasten the 2 latches (at the top) and remove 2 screws (at
the bottom) to remove the front cover and gain access to
the internal components.
CAUTION
Ensure that no cables are in the way before folding down
the PCB assembly. If the assembly is stuck, do not force
it. Doing so may damage the cables and result in serious
malfunctions. Check again to ensure that no cables or any
other parts are in the way before you proceed.
Opened
Closed
5. Loosen the screws indicated in the figure below and
connect a manometer to the pressure port. Reset the
manometer to zero before use.
6. Re-open the manual gas valve and check for leaks.
7. Open multiple fixtures that have high flow rates, such
as bathtub and shower taps, to ramp the boiler up to its
maximum firing rate.
8. When the boiler reaches its maximum firing rate, check
the inlet gas pressure reading on the manometer. The gas
pressure must fall within the ranges specified on page 9.
Digital pressure
manometer
Connecting the Gas Supply
45
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