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CONNECTIONS - PLUMBING
30
RELIEF VALVE
The Temperature and 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 23) leaving the valve outlet pointing downwards. Do not use a wrench on the
valve body - use the spanner flats provided.
RELIEF VALVE DRAIN
A drain pipe must be fitted to the relief valve to carry the discharge clear of the
water heater. Connect the drain line to the relief valve using a disconnection union.
The pipe work from the relief valve to the drain should be as short as possible, and
fall all the way from the water heater with no restrictions. It should have no more
than three right angle bends in it. Use DN15 pipe. The outlet of the drain pipe must
be in such a position that flow out of the pipe can be easily seen (refer to
AS/NZS 3500.4.2) - but arranged so hot water discharge will not cause injury,
damage or nuisance. The relief line must discharge at an outlet or air break not
more than 9 metres from the relief valve.
In locations where water pipes are prone to freezing, the drain pipe must be
insulated and not exceed 300 mm in length. In this instance, the drain pipe is to
discharge into a tundish through an air gap of between 75 mm and 150 mm.
Warning: As the function of the Temperature and Pressure Relief valve on this
water heater is to discharge high temperature water under certain conditions, it is
strongly recommended the pipe work downstream of the relief valve be capable of
carrying water exceeding 93°C. Failure to observe this precaution may result in
damage to pipe work and property.
BLEED VALVE DRAIN
A drain pipe must be fitted to the bleed valve to carry the discharge clear of the
water heater and solar controls. Connect the drain line to the bleed valve using a
disconnection union. The pipe work from the bleed valve to the drain should be as
short as possible, and fall all the way from the valve with no restrictions. It should
have no more than three right angle bends in it. Use DN15 pipe. The outlet of the
drain pipe must be in such a position that flow out of the pipe can be easily seen
(refer to AS/NZS 3500.4.2) - but arranged so water discharge will not cause injury,
damage or nuisance. The water discharged may be of a high temperature under
certain conditions.