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Electronic Controls
Electrical Controls
Suitable time and temperature controls should be installed to allow the cylinder to operate at it’s maximum
efficiency. All electrical work carried out must comply with IEE Wiring Regulations (BS 3456). Products must
also be installed as per the regulations in G3 of the Building Regulations. A boiler interlock should be in
place and is a wiring arrangement where the boiler cannot fire unless there is a demand for hot water gen-
eration.
Typical Wiring Diagrams
These diagrams relate only to the components listed. Others may vary in their wiring requirements, par-
ticularly thermostats. Always refer to manufacturers’ instructions which may override the detail in order to
function correctly.
The link must be installed between the adjustable thermostat and the safety cut-out thermostat as shown
above. The operating thermostat which controls the temperature of the domestic hot water is adjustable. A
safety cut out is also incorporated within the thermostat and will operate at 85°C ± 3°C. Both thermostats
should run in series. To reset the safety cut-out and the motorised valve the reset button must be pressed in.
JOULE cannot be responsible if alternative wiring plans are used.
Before resetting the safety cut-out or altering the thermostat setting,
isolate electrical supply to the unit before removal of the cover.
Temperature control
clockwise to increase,
counter-clockwise to
decrease
Thermal cut-out reset
under cap
2 Channel Time Clock
DHW Dual Cylinder Stat
Adjustable
Thermostat
Safety High
Limit Stat
Installer Link
DHW Zone Valve
