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CONNECTIONS – PLUMBING
31
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 in the water heater carton base.
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 an approved thread sealant such as 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. A 050 model has 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 26) 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 32). Refer to “Left and Right Hand Side Water
Connections” on page 30 for instructions on how to plug the unused connection.
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.
EXPANSION CONTROL VALVE
Local regulations may make it mandatory to install an expansion control valve
(ECV) in the cold water line to the water heater. In other areas, an ECV is
required if the saturation index is greater than +0.4 (refer to “Water Supplies” on
page 13).
The expansion control valve must always be installed after the non-return valve
and be the last valve installed prior to the water heater (refer to the cold water
connection diagram on page 29). A copper drain line must be fitted to the
expansion control valve (refer to "Relief Valve Drain" on page 32).
The valve, if installed within 500 mm of the water heater, 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.
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