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CONNECTIONS – PLUMBING
34
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.
TEMPERATURE PRESSURE RELIEF VALVE
The temperature pressure relief valve is shipped either under the top flap of the
water heater carton or behind the front cover or in a plastic bag attached to 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.
The water heater has a temperature pressure relief valve connection on its left
hand side. Rheemglas 045 to 125 models have a second temperature pressure
relief valve connection on the right hand side.
Screw the valve into the selected opening labelled “Relief Valve” (refer to the
installation diagram on page 28) leaving the valve outlet pointing downwards.
Do not use a wrench on the valve body - use the spanner flats provided. A
copper drain line must be fitted to the temperature pressure relief valve (refer to
"Relief Valve Drain" on page 35). If the water heater has a second relief valve
fitting, refer to “Left and Right Hand Side Water Connections” on page 33.
The valve must be insulated with
closed cell polymer insulation or
similar (minimum thickness 9 mm)
and the insulation installed so as
not to impede the operation of the
valve. The insulation must be
weatherproof and UV resistant if
exposed.
Where an insulation collar is
supplied with the temperature
pressure relief valve, this must be
placed over the body of the valve,
prior to fitting the valve to the water
heater (refer to the diagram on
page 34).
SK7400 A4
REV AD 02/13
USE TEFLON TAPE
FIT SUPPLIED INSULATION TO
VALVE AS SHOWN
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