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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 generation.
Typical Wiring Diagrams
These diagrams relate only to the components listed. Others may vary in their wiring requirements,
particularly thermostats. Always refer to manufacturers' instructions which may override the detail
in order to function correctly.
2 Channel Time Clock
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.
BSS 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.
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DHW Dual Cylinder Stat
Safety High
Limit Stat
Thermal cut-out
reset under cap
DHW Zone Valve
Adjustable
Thermostat
Temperature control
clockwise to increase,
counter-clockwise to
decrease
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