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.
Warning:
Certain types of plastic pipe, such as Poly-butylene pipe, are not suitable to be used as a hot
water pipe between:
this water heater and a temperature limiting device, and
this water heater and a hot water outlet if a temperature limiting device is not installed.
This water heater can produce water at a temperature and pressure which can exceed the performance
limits of these types of pipe. This may result in pipe failure leading to severe water damage to the property. If
one of these types of plastic pipe is used as a hot water pipe in the property, then a temperature limiting
device must be installed between the water heater and this pipe work.
Note:
The solar storage tank of a solar water heater should not be installed as part of a circulated hot water
flow and return system in a building. The benefits of solar gain will be significantly reduced and energy
gained from the sun lost through the pipe work. If a circulated flow and return system is required, it is
necessary to connect the return line after the solar storage tank and prior to the in-series water heater
supplied from the solar water heater. Refer to
“Circulated Hot Water Flow and Return System”
on page 23.
CONNECTION SIZES
Hot water connection: G¾B / G½.
Cold water connection: DN20 copper tube.
(connection to tank: G¾B).
Relief valve connection: RP½/15.
WATER INLET AND OUTLET
All 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
and on page
44 for multiple installations. Refer also
to
“Hot Water Delivery”
on page 22 and to
“Mains
Water Supply”
on page 20.
The cold water isolation valve and expansion control
valve, if one is installed, must be accessible from
ground or floor level. A position of up to 1800 mm
above ground or floor level is recommended. They
must not be installed either on the roof or in the
ceiling space, unless it is an accessible trafficable
area. Extend the cold water line to the cold water
inlet fitting on the solar storage tank.
A disconnection union must always be provided at the cold water inlet and hot water outlet of the water
heater to allow for disconnection of the water heater.
The pipe work from the hot water outlet
must not
be installed in front of or prevent access to the electrical
cover of the water heater.
