Technical data

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 28), 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 40).

Note:

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 (refer to “Diagnostic

Features Of Hot Surface Ignition Control” on page 39).

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 re-ignition attempt is unsuccessful, the system will enter lockout. 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. (Qualified person only: refer to “Diagnostic Features of Hot Surface Ignition Control” on

page 39).

transport clip