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GAS INLET PRESSURE
IMPORTANT - CHECK the gas supply pressure at the inlet to the water heater with the water heater and all
other gas burning appliances in the premises operating (burners alight). The minimum gas supply pressure is:
Natural Gas
If this minimum cannot be achieved, it may indicate the meter or the gas line to the water heater is undersized.
It is important to ensure that an adequate gas supply pressure is available to the water heater when other gas
burning appliances, on the same gas supply, are operating.
Gas Inlet Test Point Pressure
To check the gas inlet pressure:
Close any hot taps and ensure the
1.
burners are not operating.
Close the gas isolation valve at the gas
2.
inlet to the water heater.
Locate the gas inlet test point on the
3.
gas connection to the water heater.
▪
Remove the test point screw and
washer from the test point orifice.
▪
Connect the manometer.
4.
Open the gas isolation valve fully at the
gas inlet to the water heater.
Observe the gas pressure reading on
5.
the manometer.
If the manometer reading is between the minimum and maximum gas pressure ratings on the rating label,
no adjustment is required.
If the manometer reading is below the minimum gas pressure rating on the rating label, then either the
gas pipe to the water heater is undersized and needs to be rectified or adjustment is required at the gas
regulator.
If the manometer reading is above the maximum gas pressure ratings on the rating label, then adjustment
is required at the gas regulator.
Switch on the electrical supply at the power outlet to the water heater, if it is not already switched on.
6.
Open a hot tap fully and ensure the burners are fully ignited.
7.
It may be necessary to open a second tap.
Turn on all other gas burning appliances in the house which are on the same gas supply.
8.
Observe the gas pressure reading on the manometer.
9.
If the manometer reading is between the minimum and maximum gas pressure ratings on the rating label,
no adjustment is required.
If the manometer reading is below the minimum gas pressure rating on the rating label, then either the
gas pipe to the water heater is undersized and needs to be rectified or adjustment is required at the gas
regulator.
If the manometer reading is above the maximum gas pressure ratings on the rating label, then adjustment
is required at the gas regulator.
Turn off the other gas burning appliances in the house.
10.
If an adjustment was made during Step 9, repeat this procedure from Step 5.
11.
1.13 kPa
61
COMMISSIONING
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