Technical data

CONNECTIONS – PLUMBING
38
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.
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. 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 24.
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 tempered water and hot water lines from the water heater. The minimum recommended
tempered pipe and hot pipe sizes are DN20.
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 an approved thread sealant such as 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 27) 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 39).
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 12).
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 37). A copper drain line must be fitted to the expansion
control valve (refer to "Relief Valve Drain" on page 39).
The valve, if installed within 500 mm of the water heater, 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.