Rheem 874 Owner's Manual And Installation Instructions page 73

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 are vacant, then:
Turn off the controllers(s) (if fitted) by pressing the on / off button.
The light in the on / off button will go out and the priority light (standard controller) or the ACTIVE light
(Deluxe controller), if it is on, will go out.
Switch off the electrical supply at the power outlet to the water heater (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 water heater if there is a risk of freezing conditions occurring (refer to
Heater" on page 74).
The frost protection system will be rendered inoperable if electrical power is not available at the water
Note:
heater. Damage caused by freezing due to the unavailability of power at the water heater is not covered by
"Warranty Exclusions"
warranty (refer to
and there is a risk of freezing, then it is necessary to drain the water heater (refer to
Heater" on page 74).
on page 76). If the power has been switched off to the water heater
73
COMMISSIONING
"Draining The Water
"Draining the Water