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4. ELECTRICAL INSTALLATION
4.1 Immersion heaters
Power to immersion heaters should not be
switched on until the unit is filled with water. All
units are fitted with a 3 kW immersion heater.
Immersion heaters must be wired through the
factory fitted thermostat and thermal cut-out ac-
cording to diagram on the reverse of the electrical
box cover or see wiring diagram (right).
Alternative thermostats should not be used, regu-
lations require immersion heaters on unvented
cylinders to be connected with a thermal cut-out.
Recommended torque is 0,2 kp (20Nm). End ter-
minal fork width must not exceed 10 mm, see il-
lustration.
4.2 Wiring of immersion heaters
Follow the wiring instructions connecting the live,
neutral and earth as indicated in the illustration
(page 11). A dedicated permanent supply comply-
ing with current IEE regulations should be used,
and each circuit must be protected by a suitable
fuse and double pole isolating switch with a con-
tact separation of at least 3 mm in both poles.
All cables should comply with BS6141 table 8
HOFR 85c. IEE wiring regulations must be fol-
lowed throughout.
All internal wiring is factory mounted. Each im-
mersion heater has a working thermostat adjust-
able between 40°C - 70°C.
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 remov-
al of the lid. Ensure the lid to the electrical box is
replaced correctly and the retaining screw is fitted.
4.3 Electrical connections
The OSO Ecoline SCE is provided with two chan-
nels in the base to lay electrical cables to the cyl-
inder. The channels run diagonally from the front
centre to the rear left and right, and allow the in-
stallation to be neat with minimum visible cabling.
The immersion heater cable must be connected
to a minimum 16 amp dedicated permanent sup-
ply complying with current IET Wiring regulations,
isolation is required via a minimum 20 amp dou-
ble pole isolation switch with a minimum 3 mm
MAX
10 mm
Summary of Contents for 1327051
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