Compressor Protection Function - Daikin FTX20K(2)V1B Service Manual

SiBE041525F
3.3.3 Four Way Valve Operation Compensation
At the beginning of operation as the four way valve is switched, the pressure difference to
Outline
activate the four way valve is acquired when the output frequency is higher than a certain fixed
frequency, for a certain fixed time.
Detail
Starting Conditions
1. When the compressor starts and the four way valve switches from OFF to ON
2. When the four way valve switches from ON to OFF during operation
3. When the compressor starts after resetting
4. When the compressor starts after the fault of four way valve switching
The lower limit of frequency keeps A Hz for B seconds with any conditions 1 through 4 above.
When the outdoor temperature is above C
the outdoor temperature.
A (Hz)
B (seconds)
C (°C)
3.3.4 3-Minute Standby
Turning on the compressor is prohibited for 3 minutes after turning it off.
(The function is not activated when defrosting.)

3.3.5 Compressor Protection Function

When turning the compressor from OFF to ON, the upper limit of frequency is set as follows.
(The function is not activated when defrosting.)
A (Hz)
B (Hz)
C (Hz)
D (seconds)
E (seconds)
F (seconds)
Functions and Control
20/25/35 class
Cooling Heating
62
50
50
(Hz)
Frequency
C
B
A
D
20/25/35 class
40
54
72
180
420
180
C in heating, the frequency decreases depending on
°
50/60/71 class
Cooling Heating
48
70
15
E F
50/60/71 class
52
68
80
300
200
460
Control Specification
(sec.)
Time
(R13528)
30