Daikin FTX-N Series Service Manual page 86

Control Specification
5.3.3 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 for any of the conditions above.
When the outdoor temperature is above C in heating, the frequency decreases depending on the
outdoor temperature.
A (Hz)
B (seconds)
C
5.3.4 3-Minute Standby
Turning on the compressor is prohibited for 3 minutes after turning off.
The function is not used when defrosting.
5.3.5 Compressor Protection Function
When turning the compressor from OFF to ON, the upper limit of frequency is set as follows.
The function is not used when defrosting.
A (Hz)
B (Hz)
C (Hz)
D (Hz)
E (Hz)
F (seconds)
G (seconds)
H (seconds)
J (seconds)
K (seconds)
: Values refer to 15/18/24 class only, when outside temperature is lower than –15°C (5°F).
81
09 class
Cooling Heating Cooling Heating Cooling Heating Cooling Heating
40
(°C)
(°F)
(Hz)
Frequency
E
D
C
B
A
F
09 class
40
54
72
90
100
180
420
180
120
400
12 class
54 24 34
60 60
10 10
50 50
G H
12 class 15 class
24 52
34 68
44 80
56 98
78 —
180 300
420 200
180 460
120 200
180 —
SiUS091601EA
15 class 18/24 class
48 46
70
15
59
J K
15 class  18/24 class
35 55/48 
52
62
80
100 100
1300 240
250 200
300 200
200 120
120 120
Part 4 Functions and Control
48
60
15
59
(sec.)
Time
(R23251)
65
80
90