COMMISSIONING
32
BURNER GAS PRESSURE
It is necessary to check the burner gas pressure at both the minimum and maximum operational
settings. It is necessary to have the electrical supply to the water heater switched on, the hot water
must be flowing and the burners on to check and if necessary adjust the operational gas pressures.
Warning:
The removal of the front cover will expose 240 V wiring. Take care not to touch wiring
terminals.
•
Ensure the burners are not operating. Close any hot taps and turn off the gas supply at the gas
isolation valve.
•
Remove the screws holding the front panel to the jacket.
•
Gently disengage the front panel and pull forward to remove from the water heater.
•
Locate the burner pressure test point on the main burner manifold and connect a manometer.
•
Turn on the gas supply at the gas isolation valve.
Minimum test point gas pressure
Refer to the rating label on the water heater for the minimum test point gas pressure.
1. Open a hot tap slowly until the burners ignite.
2. Press and hold down the MIN button (“1L” is
shown on the LED display), and observe the
reading on the manometer.
manometer
min button
test point
screw
adjuster button
max button
washer
test point
orifice
L.E.D.
display
3. Release the MIN button. If the manometer
reading observed in Step 2 agrees with the
rating label, no further adjustment is required.
4. To adjust, press and hold down the adjuster
button (“LH” is shown on the LED display).
Note:
The adjuster button must be held down
continuously through steps 4 to 6.
5. Press the MIN button and observe the reading
on the manometer.
Note:
While the MIN button is pressed, the gas
pressure will at first increase then decrease,
cycling between an upper gas pressure limit (39
on LED display) and a lower gas pressure limit
(01 on LED display).
6. Release the MIN button when the reading on the
manometer agrees with the rating label.
7. Release the adjuster button.
