Gree DC Inverter Multi VRF

DC INVERTER MULTI VRF CONTROL
48
1.3.2 Control Function of Indoor Unit
1) Cooling Operation
Cooling Capacity◆
Outdoor unit will determine the compressor capacity output according to the capacity requirements of indoor unit;
Indoor unit will determine the opening of indoor electronic expansion valve by the control of outdoor unit, and the
electronic expansion valve should be set once for every 40 seconds.
Temperature Control◆
Indoor unit will control the temperature by opening and closing of indoor electronic expansion valve (Shown as the
following figure):
When the indoor unit capacity requirement is 0, you should close the electronic expansion valve;
When the indoor unit of capacity requirement is not 0, you should open the electronic expansion valve
膨胀阀OFF
膨胀阀ON
室内设定温度
+1-1室内环境温度
If all the indoor units’ temperatures of a unit are up to temperature spot, then the capacity needs is o. the outdoor
unit will stop the compressor, and all the indoor electromagnetic expansion valve will be closed.
Indoor Fan Action◆
When the indoor unit is opened and the fan is not set at automatic fan speed, the indoor fan will unceasingly
Heating timer
Defrosting mark
Defrosting timer
Compressor frequency
4-way Valve
Outdoor fan
Outdoor electronic
expansion valve
Air Bypass OFF
Indoor fan ON
Indoor electronic
expansion valve
Defrosting preparation
30s
30s
A
nti-cold ai
r
operation
Defrosting process End of defrosting
T = <10 Minutes
2 minute
1 minute 1 minute
2minute
4 minute
High fan
Expansion valve ON
Expansion Valve OFF
Indoor Ambient Temperature
Indoor Setting Temperature