INSTALLATION – SOLAR CONTROL UNIT
38
SOLAR STORAGE TANK WITH RAISED SOLAR HOT INLET
Numbers in parentheses refer to items on diagram on page 39 for
To mount the solar control unit on the solar storage tank and connect the solar cold pipe:
•
Fit the union R 3/4 M x DN15 (2) to the solar cold water outlet of the solar storage tank.
•
Connect the DN15 preformed pipe (3), pre-insulated with the 280 mm long x 13 mm diam insulation (10),
to the union (2) at the solar cold water outlet and finger tighten using the compression nut (4) and olive (5)
provided, ensuring the straight end is orientated upwards.
•
Undo the compression nut (4) and olive (5) from the underside of the solar control unit (6) and place over
the end of the DN15 preformed pipe (3).
•
Locate the solar control unit (6) in an upright position by connecting the DN15 preformed pipe (3) to the
union at the
inlet
of the circulator on the underside of the solar control unit and finger tighten using the
compression nut (4) and olive (5).
•
Secure the solar control unit (6) to the solar storage tank using the four self-tapping screws (7) provided.
•
Tighten the compression nuts (4) on both ends of the preformed pipe (3) using a spanner.
•
Disassemble the fitting union (1). Place a compression nut and olive over the end of the copper pipe
protruding from the side of the solar control unit (6) and the other compression nut and olive over the end
of the solar cold pipe (to the collector).
•
Connect the solar cold pipe (to the collector) to the pipe from the solar control unit (6) using the nipple
from the fitting union (1) and the compression nuts and olives.
Note:
A press type fitting
must not
be used to join the solar cold pipe to the pipe from the solar control
unit.
•
Clip the cold sensor (8) over the end of the preformed pipe adjacent to the union (2) at the solar cold outlet
connection.
•
Insulate the lower end of the preformed pipe (3), cold sensor and union (2), with an 80 mm long x
35 mm ID piece of insulation (11) and secure with two cable ties (12).
•
Connect the hot sensor lead from the solar collector installation to the hot sensor cable connector at the
side of the solar control unit (6). The hot sensor lead is supplied in the collector installation kit and the
procedure for its installation is in the collector installation kit
’s installation instructions.
Bundle up any excess hot sensor lead and tie off in a location where it won’t sustain damage, such as tied
to the outside of the insulation on the solar cold pipe.
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:
•
Fit the service 3-way solar valve assembly (9) to the solar hot water inlet of the solar storage tank. Ensure
the service valve inlet is pointing vertically upwards or horizontally towards the rear of the storage tank so
the opening and closing device remains easily accessible. Refer to the exploded view
on page 39
for position.
•
Connect the solar hot pipe (from the collector) to the inlet of the service valve assembly (9) using the
compression nut and olive provided with the valve.
•
Connect a DN15 copper drain line to the service valve drain outlet using the compression nut and olive
provided with the valve. The drain line must carry the discharge clear of the water heater and solar control
unit and safely to drain. Refer to the exploded view
on page 39 for position and to
on page 48.
•
Insulate the drain line from the service valve (9) with closed cell type insulation or similar (minimum
thickness 13 mm). The insulation must be weatherproof and UV resistant if exposed.
•
After the collector circuit has been purged of air (refer to
“Bleeding The Solar Collectors”
on page 53),
insulate the service valve assembly (9) from the solar tank to the drain line of the service valve with an
80 mm long x 35 mm ID piece of insulation (11) and secure with two cable ties (12).
