32
Wiring and Power Supply Information
Pump
The circulation pump must be wired Live to B8 and Neutral to B7, MAX pump power is 500 Watts. If two pumps are used wire them both
to these terminals.
The
blue cylinder sensor
plugs into a
yellow socket
CNS042 on the controller PCB and into
the cylinder in the top ½ of the cylinder.
It must install above the immersion heater
. You
must fix it so it can’t be pulled out of the cylinder. Keep it well away from any mains cables.
Thermostats/ timers and under floor heating manifolds
The heating is controlled with a field supplied room stat / setback stat, time clock or a run signal from an under floor manifold. B20 is
permanently 240V AC. The run signal goes into B22.
When using multi zone heating systems on a header, buffer or HEX
When the stat is made it will drive its zone valve open, inside the zone valve a switch links the orange to the grey wire when the valve is
open. We connect the grey to B20 permanent live and the orange to B22, the run signal. So when the valves open the heat pump will
run.
NOTE the pump will run on for 1minute after the unit is told to stop.
Hot water production is not affected and will always take
priority.
Valve Z2
Power In
Valve Z1
Valve Z2
Valve Z1
Pump Z1
Pump Z1
Run Signal to
Heat Pump
B20
B22
B19
B22
Power In
Header,
Buffer or
Heat
Exchanger
Installation Manual.indd 32
31/08/2018 19:01:54
