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COMMISSIONING
Close the hot tap(s).
12.
Close the gas isolation valve at the inlet to the water heater.
13.
Remove the manometer and refit and tighten the test point screw and washer.
14.
Open the gas isolation valve fully at the gas inlet to the water heater.
15.
16.
Open a hot tap again so the burners ignite.
17.
Test for gas leaks.
18.
Close the hot tap.
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 electrical supply to the in-series gas booster
must be switched on, the burners ignited and hot water must be flowing from a hot tap.
Warning: The removal of the front panel will expose 240 volt wiring. Take care not to touch wiring terminals.
Note: The temperature of the water entering the in-series gas booster must be below 58°C, otherwise the gas
burners will not ignite and the operational gas pressures cannot be measured.
"Minimum test point gas pressure"
Refer to
Minimum test point gas pressure
Refer to the rating label on the water heater for the minimum test point gas pressure.
1.
Close any hot taps and ensure the burners are not operating.
Switch off the electrical supply at the power outlet to the water heater.
2.
3.
Remove the top and bottom cover strips to gain access to the front panel screws by pressing on the two
ridged finger points and gently pulling forward.
Remove the screws holding the front panel to the jacket.
4.
Gently disengage the front panel and pull forward to
5.
remove from the water heater.
Locate the burner pressure test point on the main burner
6.
manifold.
▪
Remove the test point screw and washer from the test
point orifice.
▪
Connect the manometer.
Switch on the electrical supply at the power outlet to the
7.
water heater.
Open the gas isolation valve fully at the gas inlet to the
8.
water heater, if not already open.
Open a hot tap slowly until the burners ignite.
9.
"Maximum test point gas pressure"
on page 62 and
62
on page 63.
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