Commissioning - Rheem 812 Series Owner's Manual And Installation Instructions

All water heaters are tested and adjusted before dispatch from the factory, 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 at the inlet to the water heater.
Air will be forced out of the taps.

Close each tap as water flows freely from it.

Check the pipe work for leaks.

Open the gas isolation valve fully.

Check the gas pipe work for leaks.

Plug in the water heater at the power outlet and switch on the electrical supply.

Turn on a controller, if one is fitted, by pressing the on / off ( ) button.
The on / off operating light and the priority light will both glow.

Open a hot tap.
The water heater will operate automatically.

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 2.0 litres per minute.

Check and if required adjust the preset outlet temperature setting of the water heater.
"Preset Outlet Temperature Setting"
Refer to
 Check and if required adjust the outlet compensation temperature adjustment on an AU – 876 series or
NZ – 874 series water heater.
"Outlet Compensation Temperature Adjustment"
Refer to
The automatic water governor incorporated in the water heater is not adjustable.
To complete the installation, it is necessary to check the gas supply pressure at the inlet to the water heater
"Gas Inlet Pressure"
(refer to
"Burner Gas Pressure"
pressure (refer to
Upon completion and testing of the installation, ensure the controller(s) is turned off (if fitted). Explain to the
householder or a responsible officer the functions and operation of the water heater and the controllers (if
fitted).
Warning: Upon completion of the installation and commissioning of the water heater, leave this guide with
the householder or a responsible officer. DO NOT leave this guide inside of the cover of the water heater, as
it may interfere with the safe operation of the water heater or ignite when the water heater is turned on.
GAS INLET PRESSURE
the gas supply pressure at the inlet to the water heater with the water heater and all
IMPORTANT - CHECK
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.

COMMISSIONING

°C
8 8
10L
X
on page 81.
on page 77), the minimum test point pressure and the maximum test point
on page 79).
1.13 kPa
77
on page 83.
Propane, LP Gas 2.75 kPa