Compressor Protection Function - Daikin FFQ09Q2VJUFFQ12Q2VJUFFQ15Q2VJUFFQ18Q2VJURX09QMVJURX12QMVJURX15QMVJURX18QMVJU Service Manual

SiUS091628EA
2.3.3 Four Way Valve Operation Compensation
Outline At the beginning of operation as the four way valve is switched, the pressure difference to activate
the four way valve is acquired when the output frequency is higher than a certain fixed frequency,
for a certain fixed time.
Details 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 in heating, the frequency decreases depending on the
outdoor temperature.
A (Hz)
B (seconds)
C
2.3.4 3-Minute Standby
Turning on the compressor is prohibited for 3 minutes after turning it off.
(The function is not activated when defrosting.)

2.3.5 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 (Hz)
E (Hz)
F (seconds)
G (seconds)
H (seconds)
J (seconds)
K (seconds)
Functions and Control
09/12 class
Cooling
40
60
(°C) 10
(°F) 50
(Hz)
Frequency
E
D
C
B
A
F
09/12 class
40
54
72
90
—
180
420
180
120
—
15/18 class
Heating Cooling Heating
54 48
70
15
59
G H
15/18 class
52
68
80
—
—
300
200
460
—
—
Control Specification
J K
(sec.)
Time
(R23251)
34