Page | 18
Cool Energy inverTech Manual v6.6 2020 ©
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. When heat pump units are installed in parallel, ensure
that the voltage difference, between these units, is within ±2% of each other. 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 the mains power supply will affect the cable thickness. Follow the 17
th
edition wiring regulations to select the cables, circuit breakers and circuit breakers.
Earthing and Over Current Protection
In order to prevent electrical shock in case of leakage from unit, install the heat pump according to current electrical
wiring regulations.
1.
Do not frequently interrupt the voltage supply to the heat pump as this may result in a shorter life
expectance of the heat pump.
2.
When installing over current protection, ensure that the correct current rating is met for this specific
installation.
3.
The compressor, fan coil unit and heat pump water pump all have AC- contactors and thermo relay
protection. Therefore, in the process of installation and debugging, firstly measure each of the
components’
current, and then adjust the current protection range of the thermo relays.
