CONNECTIONS
–
PLUMBING
42
A disconnection union must always be provided at the cold water inlet,
solar cold water outlet, solar hot 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.
IN-SERIES BOOSTER – INTEGRATED
Refer to
“In-Series Booster – Integrated”
on page 38 for information on mounting the in-series gas booster to
the solar storage tank.
IN-SERIES BOOSTER – REMOTE LOCATION
The pipe work between the solar storage tank and an in-series water heater has a minimum recommended
pipe size of DN20,
MUST BE
of copper and be fully insulated with a closed cell type insulation or equivalent
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 water heater. A full flow isolation valve must be
installed on the water line to the in-series water heater.
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 supplied in the plastic bag with the ground kit components. 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
29
)
leaving the valve outlet
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 43).
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.
EXPANSION CONTROL VALVE
Local regulations may make it mandatory to install an expansion control valve (ECV) in the cold water line to
the water heater. In other areas, an ECV is required if the saturation index is greater than +0.4 (refer to
“Water Supplies”
on page 14).
The expansion control valve must always be installed after the non return valve and be the last valve
installed prior to the water heater
(refer to diagrams on page
41
)
. A copper drain line must be fitted to the
expansion control valve (refer to
"Relief Valve Drain"
on page 43).
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.
