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CONTROL
2.1.4 Fan Mode
The compressor, the outdoor fan and the 4-way valve are closed; temperature setting range is 16
2.2 Protection Function
When the setting mode is different of different indoor unit, the unit runs in below status:
2.2.2 Overload Protection Function
When the tube temperature is a little low, the compressor raises the operation frequency; when the tube
temperature is a little high, the compressor frequency is restricted or lows down the operation frequency; when the tube
temperature is too high, the compressor protection stops running. If the discharge temperature protection continuously
appears for 6 times, the compressor can't resume running. The compressor can resume running after cutting off the
power and then putting through the power. (if the running time of the compressor is longer than 7min, the protection
times record will be cleared)
2.2.3 Discharge Protection Function
When the discharge temperature is a little low, the compressor raises the operation frequency; when the discharge
temperature is a little high, the compressor frequency is restricted or lows down the operation frequency; when the
discharge temperature is too high, the compressor protection stops running. If the discharge temperature protection
continuously appears for 6 times, the compressor can't resume running. The compressor can resume running after
cutting off the power and then putting through the power. (if the running time of the compressor is longer than 7min, the
protection times record will be cleared)
2.2.4 Communication malfunction
Detection of the quantity of installed indoor units: After 3min of energizing, if the outdoor unit does not receive
the communication data of certain indoor unit, the outdoor unit will judge that indoor unit is not installed and will treat
it as it is not installed. If the outdoor unit receives the communication data of that indoor unit later, the outdoor unit will
treat that unit as it is installed.
2.2.5 Compressor high-pressure protection
a. When the high-pressure switch is detected cut off for 3s continuously, the compressor will enter high-pressure
protection as it stops when reaching set temperature. Meanwhile, the outdoor unit will send the signal of "high-pressure
protection" to the indoor units;
b. After the appearance of high-pressure protection, when the high-pressure switch is detected closed for 6s
continuously twice an hour, the compressor can resume running only after cutting off the power and then putting
through the power.
2.2.6 Compressor low-pressure protection
a. Low Pressure Protection for Shutdown
a low pressure protection signal will be send out.
If it is detected continuously for three seconds that the low pressure protection switch is opened after the
pressure protection occurs twice in one hour, then it becomes unrecoverable and has to be recovered by powering the
outdoor unit again.
b. Low Pressure Protection during the Operation
a) When it is detected continuously for three seconds that the low pressure protection switch is opened, then the
whole unit should be shut off and a low pressure protection signal should be sent to the indoor unit.
b) On condition that a low pressure protection error occurs and the whole unit has stopped for more than three
minutes and it is detected continuously for six seconds that the low pressure protection switch is closed, then this error
can be eliminated. However, if the low pressure protection occurs twice in one hour, then it has to eliminate the error by
powering the outdoor unit again.
16
30
.
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