Regular Annual Preventive Maintenance
In general the regular and preventive maintenance is limited to cleaning activi-
ties and to scrutinise the system functions and parameters. This is to verify that
the system is operating in safe condition and with expected efficiency. The fol-
lowing procedures describe how to carry out professional maintenance of the
HC R-290 air-conditioner.
Required maintenance of the indoor unit
1. Examine the fan for functionality and smooth running.
2. Carefully clean the air-filter, if necessary use a shower bath with hand-warm
water.
3. Check the heat-exchanger (evaporator) for contamination, if necessary clean
the evaporator (water and/or evaporator cleaning solution).
4. Check the alignment of the evaporators fins, if necessary carefully adjust the
alignment by the use of a fin-comb
5. Check and clean the condensate pan and drain hose
6. Check the control board (mode and temperature indicators)
7. Check the connection cables, wires are free of damage and screws are tight.
8. Check the remote controller for functionality.
9. Clean the housing of the indoor unit.
10. Verify the specific condition according the provided checklist with page 73.
Servicing the outdoor unit
1. Examine the fan for functionality and smooth running.
2. Examine the compressor for functionality and smooth running.
3. Check that the fixings and vibration dampers of the compressor are in good
condition.
4. Check the heat-exchanger (condenser) for contamination, if necessary clean
the condenser with OFDN
5. Never use refrigerant for cleaning of the heat exchanger.
6. Check the alignment of the condensers fins, if necessary carefully adjust the
alignment by the use of a fin-comb.
7. Check the connection cables, wires are free of damage and screws are tight.
8. Check the operational conditions of the refrigeration system.
9. Clean the housing of the outdoor unit.
10. Verify the specific condition according the provided checklist with page 102.
Refrigerant circuit
Examine the refrigerant circuit and check that it is free of leaks by using a HC
gas detector, which is reliable and safe for use with HC refrigerant R-290. Pay
particular attention to the connections of the pipe-set between the indoor and
outdoor unit, as well as to the brazed joints and mechanical connections. Verify
that all refrigerant transferring pipes are free of vibration and do not touch each
other (friction).
If repair or system service is necessary (in specific, if an intervention into
the refrigerant circuit is indicated), required activities have to be carried
out with due care and according to the advices described with the
“Service, repair and maintenance” section (beginning on page 71) of this
manual. Always wear your individual protective devices!
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