Protection Function - Gree R410A Service Manual

The status of 4-way valve: energized;
3) Outdoor fan control in heating mode
The outdoor fan starts before 5s of the starting of compressor and then it will run in high speed for 40s; The
fan shall run at every speed for at least 80s; When the compressor stops, the outdoor fan stops after 1min.
4) Defrosting function
When the defrosting condition is met, the frequency of the compressor starts to decrease and wait for
defrosting; the electronic expansion valve of all indoor units open in big angle; the outdoor fan stops after the stop
of the 4-way valve, meanwhile, the 4-way valve reverses the direction; after the 4-way valve reverses the direction,
the frequency of the compressor starts to rise; then begin to calculate the time of defrosting, the frequency of the
compressor rises to reach the defrosting frequency.
5) Oil-returned control in heating mode
a) Oil-returned condition
The whole unit is operating in low frequency for a long time
b) Oil-returned process in heating mode
The indoor unit displays "H1".
c) Oil-returned finished condition in heating mode
The duration reaches 5min
2.1.4 Fan Mode
The compressor, the outdoor fan and the 4-way valve are closed; temperature setting range is 16～30℃.

2.2 Protection Function

2.2.1 Mode Conflict Protection of indoor unit
When the setting mode is different of different indoor unit, the unit runs in below status:
1) The mode of the first operating indoor unit is the basic mode, when compare the mode of the other
indoor units to see if there is a conflict. Cooling mode (dry mode) is in conflict with heating mode.
2) Fan mode is in conflict with heating mode and the heating mode is the basic mode. No matter which
indoor unit operates first, the unit will run in heating mode.
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).
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