52
AW HT
GB 05/2009
ROUTINE MAINTENANCE
A
Never perform any cleaning operations
before having
disconnected the unit from the mains power supply.
Make sure power is not connected before proceeding.
Control maintenance is fundamental to maintain the efficien-
cy of the unit both in terms of operation and energy con-
sumption.
The Technical Service maintenance plan must be observed,
with an annual service which includes the following opera-
tions and checks:
- Filling of the water circuit;
- Presence of air bubbles in the water circuit;
- Efficiency of safety devices;
- Power supply voltage;
- Electrical power input;
- Tightness of electrical and water connections;
- Condition of the compressor contactor;
- Efficiency of the plate heat exchanger resistor;
- Verification of operating pressure, superheating and sub-
cooling
- Efficiency of the compressor heater
- Cleaning of the finned coil every three months
- Cleaning of the fan grills
- Cleaning of condensate drain pan (if installed);
For units installed near the sea, the intervals between main-
tenance should be halved.
SHUTTING DOWN FOR LONG PERIODS
A
After deactivating the heat pump:
- Disconnect the unit from the power supply.
- Make sure the remote keypad (if featured) is in the “OFF”
position.
- Place QF1 in the OFF position (see wiring diagram).
- Deactivate the indoor terminal units by placing the switch
of each unit in the “OFF” position.
- Close the water valves.
If the outside temperature
may fall below zero; there is
the risk of freezing.
The water circuit MUST BE EMPTIED AND CLOSED (if
draining after operation in heat pump mode, beware that
the water may be hot), or antifreeze must be added in
the proportion recommended by the manufacturer.
It is recommended to use non-toxic food grade
antifreeze, compliant with the standards in force in the
countries where the unit is used, if domestic hot water
production is also featured.
If the mains switch
is turned to “off” for more than four
hours, after turning it on and before reactivating the unit,
leave the power on but the unit deactivated for at least
two hours to preheat the oil in the compressor sump.
