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38
LIGHTING THE WATER HEATER
FOR YOUR SAFETY READ BEFORE LIGHTING
Warning: This gas water heater is designed to operate reliably and safely as long as the lighting procedure
is followed exactly.
Make sure the water heater is filled with water and the water supply is on, otherwise serious damage to the
vitreous enamel cylinder lining and plastic components may occur.
The installer must purge the gas line up to the gas control (refer to “Gas Inlet” on page 27), check all gas
connections for leaks, gas supply pressure, test point pressure (refer rating label) and adjust burner aeration
if necessary (refer to “Air Adjustment” on page 39).
Notes:
621 275 indoor model - remove the transport clip from the flue damper
housing.
631 275 outdoor model - the front cover must be in place before the
burner will operate. If the front cover is off when power is switched on,
the system will enter re-ignition attempt lockout.
A viewing window is provided to check burner operation on the water heater.
LIGHTING PROCEDURE
The water heater incorporates an automatic ignition system.
1. Switch on the electrical supply at the isolating switch to the water heater.
2. When the controlling thermostat registers heating is required, the hot surface igniter rod warms up for 20
seconds. The burner will automatically ignite.
3. If burner ignition is unsuccessful, a second and third re-ignition attempt will occur after a five (5) minute
delay between each try. This delay is to allow for any build-up of unburnt gas to escape.
4. If the third attempt is also unsuccessful, the system enters the re-ignition attempt lockout mode. To reset
the water heater, switch the electrical supply off at the isolating switch, wait ten seconds then switch on
again. If the water heater fails to light, phone Rheem Service or their nearest Accredited Service Agent to
arrange for an inspection.
TEST THE WATER HEATER AFTER INSTALLATION
The operation of the water heater must be thoroughly checked by the installer.
The burner flame must light smoothly and quickly from the hot surface igniter and must go out quietly and
completely.
The burner flame must be stable, although slight lifting at the front edge of the burner is acceptable when
the burner is cold.
The burner flame should be blue, with a clearly defined inner cone - luminous yellow or “floating” flames
are not acceptable and must be corrected by opening the interrupter screw (refer to “Air Adjustment” on
page 39).
Check the test point pressure and compare with the rating label. Adjust if necessary.
If unable to get the water heater working properly, contact Rheem Service or their nearest Accredited
Service Agent to arrange for an inspection.
When satisfied everything is working properly instruct the user in the correct method of operation.
Removal of the front cover on the 631 275 model whilst burner is operating will lead to re-ignition lockout.
transport clip
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