Technical data

CONNECTIONS – PLUMBING

GAS INLET

The gas connection is made to the left hand side of the gas control. The pipe work must be cleared of foreign

matter before connection and purged before attempting to light the water heater. An isolation valve and

disconnection union must be used to allow servicing and removal of the water heater.

Note: Refer to the Gas Installations Standard AS 5601 or AS/NZS 5601.1 for the correct method of sizing

the gas supply pipe to the water heater. The pipe size selection must take into account the gas input of this

water heater (refer to table on page 25) as well as all of the other gas appliances in the premises.

Warning: Always isolate the water heater before pressure testing the gas supply system. Disconnect the

water heater after the isolating cock to prevent the risk of serious damage to the gas control. The Rheem

warranty does not cover damage of any nature resulting from failure to observe this precaution. Refer to

rating label for gas types and pressures.

Ensure the gas line is also purged at the union of the gas control. If this procedure is not followed, a retry

lockout (i.e. single flashes on control module) may result on initial start up.

The HSI system has a flame sensing period of 2.5 seconds from the time the gas valve opens. If the burner

flame is not sensed during this period, a five minute waiting period follows so any unburnt gas can escape

before a second and third burner ignition is automatically attempted.

If the third attempt is also unsuccessful, the system enters the re-ignition attempt lockout mode. The LED on

the control module has a series of flashes to indicate this mode (refer to label on the access cover). The

electrical supply to the water heater must be turned off and then on again, or the reset button on the control

module must be pressed to allow further ignition attempts.

Caution: Care is necessary when tightening fittings into the gas valve. The gas valve casting may crack if

the fittings are over tightened. Cracked valve castings are not covered under the Rheem warranty. Damaged

valves must be replaced.