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6.11.5 Heat Pump cylinder wiring
The potable water circulating pump must be Earthed.
Wiring connections to Heat Pump cylinder models must be configured to operate the
potable water circulating pump when a call for heat is made by the cylinder thermostat, see
section 6.11.1.
A double pole fused spur isolator must be provided to isolate the potable water circulating
pump for servicing.
Depending on the installation, the thermostat and associated potable water circulating
pump may be powered by a digital (relay) auxiliary pump output from the heat pump.
When the cylinder thermostat is satisfied, the potable water circulating pump and heat
pump DHW call will be switched off.
Consideration should be given to control voltages - these may be a combination of 230VAC
and / or Volt free, depending on the installation and components used.
Please refer to figure 12 for a wiring example.
6.11.6 Potable water circulating pump wiring
The pump must be connected to an external double pole mains switch.
The operating voltage and frequency are marked on the pump nameplate. Ensure the
motor is suitable for the power supply on which it will be used.