CONNECTIONS – PLUMBING
47
A disconnection union must always be provided at the cold water inlet
and hot water outlet on the solar storage tank to allow for disconnection
of the solar storage tank.
This solar 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
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.
This water heater is intended to be permanently connected to the water mains and not connected by a hose-
set. A braided flexible hose or semi-flexible connector may be used for connection to the water heater, where
permitted by AS/NZS 3500.4.
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.
IN-SERIES BOOSTER (IF INSTALLED)
The pipe work between the solar storage tank and an in-series booster has a minimum recommended pipe
size of DN20,
MUST BE
of copper and be fully insulated with a closed cell type insulation or equivalent and in
accordance with the requirements of AS/NZS 3500.4. The insulation must be weatherproof and UV resistant
if exposed. The insulation must be fitted up to the connections on both the solar storage tank and the in-series
booster.
An isolation valve may be installed on the water line to the in-series booster. The isolation valve must be of a
full flow type if the in-series booster is a continuous flow water heater.
TEMPERATURE PRESSURE RELIEF VALVE
The temperature pressure relief valve is shipped either under the top flap of the water heater carton or behind
the front cover. 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.
To fit the relief valve:
•
Seal the thread with an approved thread sealant such as Teflon tape - never hemp. Make sure tape does
not hang over the end of the thread.
•
Hand tighten the valve into the opening marked “Relief Valve” (refer to the
page 36).
•
Using a spanner engaged on the valve’s spanner flats and applying medium pressure to tighten, turn the
relief valve an additional ½ to 1 ½ turns to secure and make the joint water tight, leaving the valve drain
pointing downwards.
Warning:
Do not use a pipe wrench or poor fitting tool on the valve body nor over tighten the valve,
as this could damage the valve and prevent safe operation.
•
Operate the easing lever on the valve to check the smooth operation of the valve plunger. It is very
important the lever is raised and lowered gently. The lever should move smoothly and without undue force.
•
If the lever cannot be moved or is jerky in its movement, then the valve has been damaged and must be
replaced.
•
A copper drain line must be fitted to the temperature pressure relief valve (refer to
page 48).
•
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.
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