Discharge Protection Function; Compressor Low-Pressure Protection - Gree GWHD14NK3BO Service Manual

Function and Control
The compressor, the outdoor fan and the 4-way valve are closed; temperature setting range is 16 ~30 .
2.Protection Function
2.2 Overload Protection Function
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

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
2.4 Communication malfunction
Detection of the quantity of installed indoor units: After 3min of energizing, if the outdoor unit does not receive the
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.
2.5 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;
then putting through the power.

2.6 Compressor low-pressure protection

a. Low Pressure Protection for Shutdown
If it is detected continuously for three seconds that the low pressure protection switch is opened after the compressor stops
a) When it is detected continuously for three seconds that the low pressure protection switch is opened, then thewhole unit
minutes and it is detected continuously for six seconds that the low pressure protection switch is closed, then this error
powering the outdoor unit again.
2.7 Compressor overload protection
If the compressor overload switch is detected having movement, the indoor unit will display the corresponding malfunction
as it stops when the indoor temperature reaching set temperature. When the compressor stops for more than 3min and the
compressor overload switch is reset, the unit will resume operation status automatically. If the protection appears for more
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