6
6. Electrical installation
- all wiring must conform to current IEE regulations
6.1 Immersion heater Thermostat
The immersion heater is designed as an auxiliary heater as an emergency back-up. Power to immersion heaters
should not be switched on until the unit is filled with water. All units are fitted with one 3 kW immersion heater which is
located behind the electrical box. Alternative thermostats should not be used, regulations require immersion heaters on
unvented cylinders to be connected with a thermal cut-out. Follow the wiring instructions below connecting the live,
neutral and earth as indicated.
The unit must be connected to a minimum 16 amp dedicated permanent supply complying with current I.E.E Wiring regula-
tions, isolation is required via a minimum 20 amp double pole isolation switch with a minimum 3 mm separation required.
All electrical wiring should be carried out by a competent electrician, using a heat resistant cable (minimum 85°C), and be
in accordance with the latest I.E.E Wiring Regulations.
Each immersion heater has a working thermostat adjustable be
-
tween 18°C - 70°C (+/- 5°C). A safety cut-out is also incorporated within the thermostat and will operate at 87°C (± 7°C).
Should this happen, check reasons for thermal cut-out button being released and when satisfied press the reset button.
N
L
Sensor pocket
Immersion
Element
Thermostat
IP21
OSO Hotwater (UK) Limited can not be held respon-
sible if alternative wiring plans are used.
Important: Before resetting the safety cutout or al-
tering the thermostat setting isolate electrical sup-
ply to the unit before removal of the lid. Ensure the
lid to the electrical box is replaced.
The thermostat must never be dismantled or
opened. This will compromize its function and may
cause risk of overheating. Guarantee will cease.
Wiring diagram
