COMMISSIONING
24
BURNER GAS PRESSURE
It is necessary to check the burner gas pressure at both the minimum and maximum operational settings. To
check and if necessary adjust the operational gas pressures, the burner must be ignited and hot water must
be flowing from a hot tap.
Checking and Adjusting Test Point Burner Gas Pressures
Refer to the rating label on the water heater for the minimum and maximum test point gas pressures.
1. Close any hot taps and ensure the burner is not operating.
2. Close the gas isolation valve at the gas inlet to the water heater.
3. Remove the screws holding the front panel to the jacket.
4. Gently disengage the front panel and
pull downward to remove from the
water heater.
5. Locate the burner gas pressure test
point on the main burner manifold.
Remove the test point screw and
washer from the test point orifice.
Connect the manometer.
6. Open the gas isolation valve fully at the
gas inlet to the water heater.
7. Set dip switches 1, 2 and 3 to the “ON” (up) position.
8. Open a hot tap fully until the burner ignites.
The burner will now operate on the minimum gas
pressure setting.
9. Observe the gas pressure reading on the
manometer and compare to the minimum test point
gas pressure stated on the rating label.
10. If adjustment is required, using a phillips head
screw driver turn the “MIN” dial anti-clockwise to
increase the minimum burner gas pressure or
clockwise to reduce the minimum burner gas
pressure, whilst reading the gas pressure on the
manometer.
11. When the minimum burner gas pressure is
correctly adjusted, set dip switch 2 to the
“OFF” (down) position.
The burner will now operate on the maximum gas
pressure setting.
12. Observe the gas pressure reading on the
manometer and compare to the maximum test
point gas pressure stated on the rating label.
13. If adjustment is required, using a phillips head screw driver turn the “MAX” dial anti-clockwise to increase
the maximum burner gas pressure or clockwise to reduce the maximum burner gas pressure, whilst
reading the gas pressure on the manometer.
14. When the maximum burner gas pressure is correctly adjusted, set the dip switch 1 to the “OFF” (down)
position.
15. Wait for 1 second, then set dip switch 3 to the “OFF” (down) position.
16. Turn off the hot water tap.
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