Technical data
20
CONNECTIONS – PLUMBING
All plumbing work must be carried out by a qualified person and in accordance with the Standard
AS/NZS 3500.4 and all local codes and regulatory authority requirements. In New Zealand the installation
must also conform with the New Zealand Building Code.
CONNECTION SIZES
Hot water connection: Rp 2.
Cold water connection: Rp 2.
Primary flow / return connection: Rp 2.
Relief valve connection: Rp 3/4.
WATER INLET AND OUTLET
All pipe work must be cleared of foreign matter before
connection and purged before attempting to operate the
storage tank. 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 storage tank. An acceptable
arrangement is shown in the diagram and on pages 26
or 30 for multiple installations. Refer also to “Hot Water
Delivery” on page 15 and to “Mains Water Supply” on
page 14.
A disconnection union must always be provided at the cold
water inlet, primary flow / return connection and hot water
outlet on the storage tank to allow for disconnection of the
storage tank.
This storage tank has either a plastic dip tube or fitting liner
in the inlet and outlet fittings (see diagram). These must be
in place for the storage tank 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
The pipe sizing of hot water supply systems for commercial installations 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 primary heating source, storage tank and local regulatory authority
requirements must be made.
TEMPERATURE PRESSURE RELIEF VALVE
The temperature pressure relief valve is shipped in a plastic bag attached to the storage tank. The
temperature pressure relief valve must be fitted before the storage tank 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 19) 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 21).
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.