37
CONNECTIONS – PLUMBING
All plumbing work must be carried out by a qualified person and in accordance with the requirements of the
Standard AS/NZS 3500.4, and all local codes and regulatory authority requirements. In New Zealand, the
installation must conform with Clause G12 of the New Zealand Building Code.
CONNECTION SIZES
Hot water connection: RP¾/20.
Cold water connection: RP¾/20.
Relief valve connection: RP½/15.
WATER INLET AND OUTLET
The pipe work must be cleared of foreign matter before
connection and purged before attempting to operate the
water heater. All olive compression fittings must use brass or
copper olives. Use thread sealing tape or approved thread
sealant on all fittings.
An isolation valve and non return valve must be installed on
the cold water line to the water heater. An acceptable
arrangement is shown in the diagram. Refer also to
“Hot
Water Delivery”
on page 21 and to
“Mains Water Supply”
on
page 20.
A disconnection union must always be provided at the cold
water inlet and hot water outlet on the water heater to allow
for disconnection of the water heater.
This water heater has either a plastic dip tube or fitting liner in
the inlet and outlet fittings (see diagram). These must be in
place for the water heater to function properly. Do not remove
or damage them by using heat nearby. They will be pushed
into the correct position as the fitting is screwed in.
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 behind the lower front cover 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
24) leaving the valve drain
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 38).
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.
