20
COMMISSIONING
All water heaters are tested and adjusted before dispatch, however further
adjustments may become necessary because of local conditions.
TO TURN ON THE WATER HEATER
Open all of the hot taps in the house (don’t forget the shower). Open the cold water
isolation valve fully. Air will be forced out of the taps. As water flows freely from each
tap, close it.
Open the gas isolation valve fully. Plug the water heater in and switch the power
outlet on. The water heater will now operate when a hot tap is opened.
Check to ensure the flow from each connected hot tap is sufficient to operate the
water heater. The minimum operating flow rate for all models is 3 litres per minute.
The automatic water governor incorporated in the water heater is not adjustable.
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 pressures are:
Natural Gas 1.13 kPa Propane 2.75 kPa.
If this minimum cannot be achieved, it may indicate the meter or the supply pipe to
the water heater is undersized.
BURNER GAS PRESSURE
It is necessary to check the burner gas pressure at both the minimum and maximum
operational settings. The hot water must be flowing and the burners on to check and
if necessary adjust the operational gas pressures.
●
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 disengage from the flue
terminal.
●
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.
