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Control Specification SiUS091601EA
81 Part 4 Functions and Control
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.
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.

: Values refer to 15/18/24 class only, when outside temperature is lower than –15°C (5°F).
09 class 12 class 15 class 18/24 class
Cooling Heating Cooling Heating Cooling Heating Cooling Heating
A (Hz) 40 54 24 34 48 46 48
B (seconds) 60 60 70 60
C (°C) 10 10 15 15
(°F) 50 50 59 59
09 class 12 class 15 class 15 class

18/24 class
A (Hz) 40 24 52 35 55/48

B (Hz) 54 34 68 52 65
C (Hz) 72 44 80 62 80
D (Hz) 90 56 98 80 90
E (Hz) 100 78 — 100 100
F (seconds) 180 180 300 1300 240
G (seconds) 420 420 200 250 200
H (seconds) 180 180 460 300 200
J (seconds) 120 120 200 200 120
K (seconds) 400 180 — 120 120
(sec.)
Time
(R23251)
(Hz)
Frequency
C
D
E
B
F G H J K
A