Rheem 300 series - Manual (Page 21)

CONNECTIONS – PLUMBING
21
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 installed 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.
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
To achieve true mains pressure operation, the cold water line to the water
heater should be the same size or bigger than the hot water line from the water
heater.
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 carton with the draught
diverter. This 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 19 ) leaving the valve outlet pointing downwards. Do not use a wrench on
the valve body - use the spanner flats provided.