Rheem Gas Heavy Duty Water Heater Models 265 Litre and 275 Litre - Manual (Page 26)

CONNECTIONS – PLUMBING
26
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. Refer to the
Gas Installations Standard AS 5601 for the correct pipe sizing.
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. 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 warranty. Damaged valves must be replaced.
PIPE SIZES
The pipe sizing for hot water supply systems should be carried out by persons
competent to do so, choosing the most suitable pipe size for each individual
application. Reference to the technical specifications of the water heater and
local regulatory authority requirements must be made.
RELIEF VALVE
The temperature pressure relief valve is shipped in the plastic bag attached to
the side of the water heater. The temperature pressure relief valve must be
fitted before the water heater is operated. Before fitting the relief valve, make
sure the probe has not been bent. Seal the thread with Teflon tape - never
hemp. Make sure the tape does not hang over the end of the thread.
Screw the valve into the correct opening
(refer to the installation diagram on
page 22 ) leaving the valve outlet pointing downwards. Do not use a wrench on
the valve body - use the spanner flats provided.