DC Inverter Multi
VRF Service Manual
27
CONTROL
Cooling Running
Cooling running
Is startup being initialized ？
Is compressor
being protected?
Outdoor fan: cooling control mode Outdoor fan: cooling control mode
Outdoor electronic expansion valve:
fully open
Compressor: capacity control
B
Yes
No
Yes
No
4-way valve: stop 4-way valve: stop
4-way valve: stop
Outdoor fan:
protection control
Compressor:
protection control
Compressor: initialized
Outdoor electronic expansion valve:
stop
Outdoor electronic expansion valve:
fully open
Heating running
4-way valve: open
Heating running
Is startup being initialized?
Is defrost running?
Is compressor being
protected?
Outdoor fan：heating control mode
Compressor：capacity control
B
Yes
No
Yes
No
Yes
No
Electronic expansion valve of
outdoor unit：capacity control
4-way valve: open
Compressor：initialized
Electronic expansion valve of
outdoor unit：capacity control
4-way valve: reverse
Outdoor fan：
defrost control
Compressor：initial defrost control
Electronic expansion valve of
outdoor unit：fully open
4-way valve: open
Outdoor fan：
protection control mode
Compressor：protection control
Electronic expansion valve of
outdoor unit：capacity control
Outdoor fan：heating control mode
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