SiBE04-809 Control Specification
Function and Control 33
3.3.3 Four Way Valve Operation Compensation
Outline Heat pump only
At the beginning of the operation as the four way valve is switched, acquire the differential
pressure required for activating the four way valve by having output the operating frequency,
which is more than a certain fixed frequency, for a certain fixed time.
Detail Starting Conditions
1. When starting compressor for heating.
2. When the operating mode changes to cooling from heating.
3. When starting compressor for rushing defrosting or resetting.
4. When starting compressor for the first time after the reset with the power is ON.
5. When starting compressor for heating next to the suspension of defrosting.
6. When starting compressor next to the fault of switching over cooling / heating.
Set the lower limit frequency (cooling : Hz, heating : Hz) for seconds with any
conditions 1 through 6 above.
Compensation frequency in cooling
68
Compensation frequency in heating
66
Compensation timer
45
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