Unit installation

INSTALLATION – SOLAR CONTROL UNIT
7
If this installation utilises selective surface collectors, it may be necessary to
use the short sensor lead adaptor, which is supplied taped to the plastic bag
containing the hot sensor in the roof kit, to enable the mating of the
connections. If the short sensor lead adaptor is not required it can be
discarded.
Note: Ensure the hot sensor lead is not in direct contact with the solar hot or
solar cold pipe work at any point of the collector circuit, otherwise damage to
the sensor lead can occur due to the high temperatures which can be
experienced within the pipe work. Damage to the hot sensor lead can result
in solar gain not being achieved and the freeze protection system being
rendered inoperative. The hot sensor lead may be cable tied to the outside of
the insulation on the solar pipe work.
To connect the solar hot pipe to the solar storage tank:
 Insulate the solar non-return valve of the air bleed valve and solar non-return
valve assembly (11) with the 50 mm long x 35 mm diam insulation (13)
provided.
 Fit the air bleed valve and solar non-return valve assembly (11) to the solar
hot water inlet of the solar storage tank. Ensure the bleed valve outlet is
pointing vertically downwards.
 Connect a DN15 copper drain line to the bleed valve, to carry the discharge
clear of the water heater and solar control unit, using the compression nut
and olive provided (refer to “Bleed Valve Drain” page 11).
 Fit a ½” x ½” hex nipple (1) to the exposed end (inlet) of the air bleed valve
and solar non-return valve assembly (11) (ensure the compression end of the
nipple is exposed).
 Connect the solar hot pipe (from the collector) to the nipple (1) on the air
bleed valve and solar non-return valve assembly (11) using the compression
nut (5) and olive (6) provided.
 Insulate the tee and bleed valve, from the solar hot pipe to the drain line of
the bleed valve, with the 150 mm long x 35 mm diam insulation (13) and
secure with the cable ties (14) provided.
 Insulate the drain line from the bleed valve with closed cell polymer insulation
or similar (minimum thickness 13 mm). The insulation must be weatherproof
and UV resistant if exposed.