COMMISSIONING
64
PRESET OUTLET TEMPERATURE SETTING
Note:
AS 3498 requires that a water heater provides the means to inhibit the growth of Legionella bacteria in
potable water. This water heater has an in-series gas booster which can satisfy this AS 3498 requirement
provided the gas booster is energised, the booster preset outlet temperature setting is 70°C or higher and a
remote temperature controller or an EZiSET kit is not used.
It will be necessary to check and if required to adjust the preset outlet temperature setting of the in-series gas
booster. Refer to the
“Preset Outlet Temperature Setting” section of the Installation Instructions and Owner’s
Guide supplied with the in-series gas booster.
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
1.13 kPa
Propane
2.75 kPa
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.
It is necessary to remove the pipe cover from underneath the gas booster, by undoing the retaining screws, in
order to test the gas pressure at the inlet of the gas booster. Refit the pipe cover at the completion of the
installation.
Refer to the “Gas Inlet Test Point Pressure” section of the Installation Instructions and Owner’s Guide supplied
with the gas booster.
BURNER GAS PRESSURE
It is necessary to check the burner gas pressure at both the minimum and maximum operational settings. It is
necessary to have the electrical supply to the water heater switched on, the hot water must be flowing and the
burners on to check and if necessary adjust the operational gas pressures.
Warning:
The removal of the front cover will expose 240 volt wiring. Take care not to touch wiring terminals.
Refer to the “Minimum Test Point Gas Pressure” and “Maximum Test Point Gas Pressure” sections of the
Installation Instructions and Owner’s Guide supplied with the gas booster.
TO TURN OFF THE WATER HEATER
If it is necessary to turn off the water heater on completion of the installation, such as on a building site or
where the premises is vacant, then:
Switch off the electrical supply at the power outlets to the solar storage tank and gas booster (refer to note
below).
Close the gas isolation valve at the inlet to the water heater.
Close the cold water isolation valve at the inlet to the water heater.
Drain the gas booster if there is a risk of freezing conditions occurring (refer to
on page 66).
Notes
The frost protection system of the gas booster will be rendered inoperable if electrical power is not
available at the gas booster.
Damage caused by freezing due to the unavailability of power at the gas booster is not covered by the
Rheem warranty (refer to
on page 4).
If the power has been switched off to the gas booster and there is a risk of freezing, then it is necessary
to drain the gas booster (refer to
on page 66).
