35
COMMISSIONING
TO FILL AND TURN ON THE WATER HEATER
The power supply to the water heater must not be switched on until the water heater is filled with
water and a satisfactory megger reading is obtained.
Open all of the hot water taps in the house (don‟t forget the shower).
Open the cold water isolation valve fully to the water heater.
Air will be forced out of the taps.
Close each tap as water flows freely from it.
Check the pipe work for leaks.
Switch on the electrical supply at the isolating switch to the water heater.
Set the timer if one is installed.
If the water heater is full of cold water, the fan will activate and heating will commence unless the ambient air
temperature is below 3°C to 5
o
C, in which case the booster heating unit will operate.
The heat pump may take up to one minute to commence operating when the power supply is switched on.
The heat pump will only operate when the water in the storage tank requires heating and the heat pump
compressor is cool.
The booster heating unit will operate instead of the heat pump if the ambient air temperature is less than 3°C
to 5°C.
Note: The heat pump may not turn on after having just completed a heating cycle and more hot water is
drawn from the water heater. The heat pump will wait until the compressor has cooled down and the
conditions for start up are favourable in order to protect the compressor from damage. This may take up to
90 minutes from the last heating cycle.
It is important to wait for five minutes after the heat pump has activated to ensure it continues to operate and
is functioning correctly.
Explain to the householder or a responsible officer the functions and operation of the heat pump water
heater. Upon completion of the installation and commissioning of the water heating system, leave this guide
with the householder or a responsible officer.
TO TURN OFF THE WATER HEATER
If it is necessary to turn off the water heater on completion of the installation, such as on a building site or
where the premises are vacant, then:
Switch off the electrical supply at the isolating switch to the water heater.
Close the cold water isolation valve at the inlet to the water heater.
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