OSO HOTWATER Super SC 150, Installation Instructions Manual

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6. 2 Wiring for immersions (cont)
A safety cut-out is also incorporated within
the thermostat and will operate at 85°C ±
3°C. Should this happen, check reasons
for thermal cut-out button being released
and when satisified press the reset button
Important: Before resetting the safety cut-
out or altering the thermostat setting,
isolate electrical supply to the unit prior to
removal of the lid. Ensure the lid to the
electrical box is replaced correctly and the
retaining screw is fitted
6.3 System wiring
Motorised valve:
To comply with
regulations governing the installation of
indirect unvented cylinders, a motorised
valve must be fitted in the primary
pipework .
The wiring plan shown is based on the use
of a 10-way Junction Box (Honeywell Part
no. 42002116-001) terminal 10 is switched
live and, if needed, terminal 9 is pump live.
Your OSO unit has been supplied with a two
port motorised valve, which will act as a
positive energy cut-out should the safety cut-
out operate.
The motorised valve will also control the
temperature of the domestic stored water via
the cylinder thermostat, which is located in
the electrical box. The unit should be
installed on an “S” or “Y” plan system. Please
follow the wiring instructions carefully.
The working thermostat which controls the
temperature of the domestic hot water is
adjustable between 40°C - 70°C. A safety
cut out is also incorporated within the
thermostat and will operate at 85°C ± 3°C.
Should the safety cut out be brought into
operation, the motorised valve will operate
and close down the primary flow to the
cylinder. To reset the safety cut-out and the
motorised valve the reset button must be
pressed in. If using a 6-wire 28mm or 1” BSP
V4043H on either circuit the white wire is not
needed and must be made electrically safe.
Basic Boiler L E N L N E
BOILER PUMP
10 8 3 2 1 10 8 2 3