Owner’s Manual – Solar Water Heaters
7
H3165 029664 Rev. B
Solar Collector Pipework
General:
The solar flow and return pipes are to be run
in DN15 copper. Plastic pipes and fittings are
not to be used.
Pipes are not to be saddled to the water
heater case. Damage to the internal
sensor wiring caused by screws or other
penetrations may not be not covered by the
warranty.
Pipe Insulation:
The pipes are to be fully insulated with UV
stabilised insulation suitable for solar working
temperatures. The insulation is to be at least
equivalent to 13mm Armaflex DuoSolar with
a thermal conductivity of not more than 0.045
W/(m.K) at 60°C.
Refer to the Solar Collector Installation Guide
for further information.
As well as reducing heat loss from the pipes,
the insulation helps to prevent the water
inside the pipes freezing.
Failure to insulate the pipes correctly may
affect the warranty.
Solar Return Connection:
The following fittings are supplied in the
Accessories Kit:
• 2 x Ball Valves.
• 1 x Tee.
• 1 x Reducing Union.
• 2 x Compression Fittings.
The ball valves, tee, union and compression
fittings are to be connected into the
RP¾”(DN20) socket marked “SOLAR RTN”
on the right hand side of the water heater in
the middle.
The order of connection is shown on the
page opposite. Ensure that a sealing material
is applied to each fitting to prevent water
leaks.
Solar Return Pipe:
The solar return pipe runs from the outlet
of the solar collectors to the solar return
connection on the water heater.
A heat trap with a vertical drop of 250 mm
is to be installed within 1 metre of the
solar return connection. Please refer to the
diagram on page 9.
Connect the solar return pipe to the DN15
compression fitting on top of the DN15 Tee
and tighten the fitting.
