10
R
Power supply
1. If the supply voltage is too low or too high, it can cause damage and/or result in unstable
operation of the heat pump unit, due to high in rush currents on start up.
2. The minimum starting voltage should be above 90% of rated voltage. The acceptable
operating voltage range should be within ±10% of the rated voltage. The voltage
difference between phases of a three phase power supply should be within ±2%.
3. Ensure the cable specifications meet the correct requirements for the specific
installation. The distance between the installation site and mains power supply will affect
the cable thickness. Follow the local electrical standards to select the cables, circuit
breakers and isolator breakers.
Grounding
In order to prevent electrical shock in case of leakage from unit, install the domestic air to
water heat pump water heater according to electrical standard
s
.
1. Do not interrupt the voltage supply to the heat pump frequently as this may result
in
a
shorter life expectance of the heat pump.
Controller PC board Settings
The Controller PCB has a pin selectable toggle switch which must be set according to the
specific installation requirement.
NOTE:
Before any changes are made to the pin settings, ensure that the mains supply power
is OFF at the circuit breaker or physically disconnected from the mains supply.
The single system heat pump unit controller PC Board consists of a 3-pin selectable toggle
switch.
Single system and single phase
Figure 4:
Switch Layout
Note: When switch 1 is set to OFF, circulation pump
will
function. ON, it doesn’t.
When switch 2 is set to OFF, electric
heating
will
function. ON, it doesn’t.
When switch 3 is set to OFF, expansion valve
will
function. ON, it doesn’t.
1 2 3
ON
OFF
10
R
1 2 3
ON
OFF
