Daikin FVXS25FV1B Service Manual page 48

SiBE06-708
3.3.3 Four Way Valve Operation Compensation
Outline 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 : 68Hz, heating : 66Hz) for 45 seconds with any conditions
1 through 6 above.
1. The MRC/W turns ON when the compressor starts for heating after the MRC/W has been
2. The MRC/W turns OFF when the compressor starts for cooling after the MRC/W has been
3. The compressor starts for the first time after reset.
4. The compressor starts after suspension caused by the trouble of cooling/heating
Function and Control
25/35 class
50 class
OFF with compressor halted.
ON with compressor running.
changeover.
Set the lower limit frequency to 48 Hz for 70 seconds with any conditions 1 through 4 above.
Control Specification
37