MDCI Series – All DC Inverter Outdoor Units (Three phase)
6 720 862 442 (2016/04)
NORMAL OPERATION OF UNIT | 7
6. NORMAL OPERATION OF UNIT
Symptom 1: The system does not operate
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The air conditioning unit does not start immediately after the unit has
been turned on. To prevent compressor overload the unit will start
after 5 minutes.
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If the operation lamp and the “pre def indicator or fan only indicator
lights, it means you have chosen heat mode. When turned on if
“anti cold wind” protection appears, it means the outside ambient
temperature is too low and outside its parameters.
Symptom 2: Changing to fan mode during cooling
mode
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Once the indoor unit has achieved it’s desired temperature, the
unit will automatically switch to fan mode and circulate air. (This
is to prevent the indoor unit frosting) When the temperature rises
above the desired set point, the unit will automatically switch back
to cooling mode.
Symptom 3: White mist comes out of a unit
Symptom 3.1: Indoor unit
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When humidity is high during cooling mode, the indoor unit can
become contaminated and dirty. Ensure the indoor unit gets cleaned
by a qualified personnel. This operation requires qualified personnel.
Symptom 3.2: Indoor unit, outdoor unit
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When the system has changed over to heating after defrosting mode,
moisture generated turns to steam and is exhausted.
Symptom 4: Noises on the air conditioning unit
Symptom 4.1: Indoor unit
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When the unit is running, a low humming noise will be apparent until
the unit has stopped.
When the drain pump (optional accessories) is in operation, a noise
will be heard.
When the system stops after heating, the system will encounter a
noise whilst the refrigerant settles down. Expansion valves shut down
and refrigerant gets trapped in the system.
Symptom 4.2: Indoor unit, outdoor unit
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A continuous low hissing sound is heard when the system is in
operation.
This is the sound of refrigerant gas flowing through both indoor and
outdoor units.
A ‘hissing’ sound will be apparent when the unit starts and stops.
This is the noise of refrigerant.
Symptom 4.3: Outdoor unit
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When the tone of the operating noise changes.
This noise is caused by the change of frequency.
Symptom 5: Dust comes out of the unit
When the system is not used for long periods, you may find dust that
has settled in the unit discharges first.
Symptom 6: The units can give off odours
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Household smells can adhere to the units, cleaning the filters during
service will improve this.
Symptom 7: The outdoor unit fan does not spin
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During operation. The speed of the fan is controlled in order to
optimise product operation.
7. TROUBLESHOOTING
7.1 Problems and causes of the air conditioning
unit
If one of the following malfunctions occur, stop operation, shut off the
power, and contact with your dealer.
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Should the light still flash when the unit has been powered off/on.
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If the remote controller has faulted.
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A safety device such as a fuse or a breaker frequently activates.
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Should objects or water enter the unit.
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Water leaks from indoor unit.
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Other malfunctions.
If the system is not operating correctly and there are non of the above
symptoms, then refer to table (7-1).
