3
Please read following information before asking for maintenance.
Explanation of heating operation
It may take longer to reach the set temperature for general
heating operation than for cooling operation.
The following operation is performed in order to prevent the
heating capacity from dropping or cold air from blowing
Defrost operation
When the system is running in heating mode, the outdoor unit
may frost in low ambient temperature. To increase efficiency,
the unit will start defrosting automatically (after 2-10 minutes),
and then water will drained out from the outdoor unit.
In order to prevent cold air from blowing out of an indoor unit
at the start of heating operation, the indoor fan is automatical-
ly stopped. It may take some time before the fan starts. This is
not a malfunction.
Protection mode
In protection mode the system will stop automatically and the
outdoor main PCB will display the specified protection code. If
the unit displays protection or error code, contact your dealer for
servicing and maintenance.
Error
When the system has error, the system will stop automatically
and the outdoor main PCB will display the specified error code. If
the unit displays protection or error code, contact your dealer for
servicing and maintenance.
Operation range
Use the system in the following temperature and humidity ranges
for safe and effective operation.
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Room
-5°C ~ 48°C
17°C ~ 32°C
15°C ~ 30°C
Cooling mode
Heating mode
Mode
Temperature
Outdoor
temperature
Indoor
temperature
Indoor room’s
relative
humidity
below 80%
Table.3-1
-23°C ~ 24°C
CAUTION
This unit should only be serviced and maintained by a
professional air conditioning service engineer. Incorrect
servicing or maintenance can cause electric shock, fire or
leakage of water. If the unit displays protection or error code,
contact your dealer for servicing and maintenance.
NOTE
Please switch off the power supply when protection or error
occurs. Do not restart until the problems are solved.
4. TROUBLES AND CAUSES
4.1 Symptoms that are not air conditioner troubles
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Symptom 1: Outdoor unit makes a hiss noise
A slight hiss noise is caused by the heat-expansion and
cold-contraction of the heat exchanger as the temperature
changes.
At the beginning or end of the defrosting process, a slight
hiss noise is caused by the four-way valve action.
At the beginning or end of the running process, a sound
like water flowing in the valve occurs, which will be
amplified after 3-15 minutes. This sound may be caused by
refrigerant flow or discharge the drain water.
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Symptom 4: Indoor unit operation indicator flash
Power supply resumes after an abnormal power off
In mode conflict
Fan stops to prevent sending cold air
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Symptom 6: System does not operate
Power supply is off
Power manual switch is off
Fuse is blown
Timer setting time is activated
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Symptom 7: Insufficient cooling or heating capacity
Dirty heat exchanger
Unit inlet, outlet or filter is blocked
Fan speed is low
In fan only mode
Temperature setting is not suitable
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Symptom 3: Indoor unit emit foreign smell
The foreign smell is from indoor furniture, cigarettes or
cosmetics which adhere to the unit.
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Symptom 2: Outdoor unit heat exchanger discharge mist or water
Outdoor unit is defrosting.
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Symptom 5: Automatically start-up or stop
Timer setting is activated.
NOTE
The temperature should below 55°C during transporing
The protection function may occur if the unit operates beyond
above conditions, the unit will stop running.
