COMMISSIONING
38
BURNER GAS PRESSURE TESTING AND ADJUSTMENT
The burner gas pressure must be checked and adjusted (if required) as part of
the commissioning procedure. Refer to
table on page 31 or check
the rating label of the water heater for the burner test point pressure with the
burner operating.
To check and adjust the burner gas pressure of the water heater:
1.
Remove the access cover.
2.
Close down the gas control valve (refer to
page 43) and close the gas isolation valve to the water heater.
3.
Using a small flat
bladed screwdriver,
lever and remove the
black plastic cover
surrounding
the
burner pressure test
point on gas control.
4.
Remove the screw
from
the
burner
pressure test point
on the right side of
the gas valve and
attach
the
manometer hose to
the test point.
5.
Open the gas isolation valve fully.
6.
Light the water heater and ensure the burner is operating (refer to
on page 40).
7.
Take the manometer reading (burner must be operating).
The burner gas pressure should be:
1.0 kPa (±5%) for a natural gas model, or
2.7 kPa (±5%) for a propane model.
If adjustment is not required, proceed to step 9.
If adjustment is required, proceed to step 8.
Gas control valve (shown with thermostat dial removed)
GAS KNOB
(pilot, burner & off)
gas inlet
port
pilot adjustment
screw
burner pressure
adjustment screw
burner pressure
test point
plastic cover
inlet pressure
test point
