DC INVERTER MULTI VRF CONTROL
47
Outdoor dry bulb temperature (℃)
Or the outdoor ambient temperature is below -6 ℃; and keeps heating (the four-way valve is under the heating
position) for 2 hours;
◆ Defrosting Stop Conditions:
Outdoor coil pipe temperature is higher than 15 ℃ or the defrosting is running for 10 minutes continuously.
◆ Defrosting Movements:
The defrosting is made by switching four-way valve to cooling mode.
The action time for unit defrosting operation is shown as the following figure.
Timing diagram of the defrosting process
Intermediate sensor temperature (℃)
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