Commissioning - Rheem MPi 551 Series Owner's Manual And Installation Instructions

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 and the connection points for the flexible braided hoses for leaks.
Switch on the electrical supply at the isolating switch to the water heater.
Set the timer if one is installed.
Note: The water heater is preset in the factory to allow it to commence operating with either the heat pump
or booster heating unit immediately power is turned on for the first time. If power is turned on and then off at
its installation, the water heater may take up to forty five (45) minutes to commence operating when the
power supply is switched on again. This forty five (45) minute period can be overridden during the
commissioning procedure if the power was inadvertently turned on and then off again. Refer to
Reset"
on page 44.
The heat pump will only operate when power is available at the water heater, the water in the storage tank
requires heating, the heat pump compressor is cool and the ambient air temperature is within the heat
pump‟s operating temperature range of between a minimum of 3°C to 5°C and a maximum of 45°C to 55°C.
If the ambient temperature is outside of this range, the water heater will commence heating with the booster
heating unit.
When the heat pump is operating, the system will switch to the booster heating unit if the detected ambient
air temperature is outside the operating temperature range of between a minimum of 3°C to 5°C and a
maximum of 45°C to 55°C.
The system will not switch back to heat pump operation from the booster heating unit if the detected ambient
air temperature has moved back within the heat pump‟s operating temperature range. The heating cycle will
be completed by the booster heating unit.
Note: The heat pump may not turn on after either having just completed a heating cycle and more hot water
is drawn from the water heater or power is shut down to the compressor, either during or at the end of a
heating cycle. 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 will be a minimum of forty five (45)
minutes and may take up to ninety (90) minutes from the last heating cycle.
It is important to wait for five (5) 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.

COMMISSIONING

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