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SiUS091628EA Control Specification
Functions and Control 34
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.
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.)
09/12 class 15/18 class
Cooling Heating Cooling Heating
A (Hz) 40 54 48
B (seconds) 60 70
C
(°C) 10 15
(°F) 50 59
09/12 class 15/18 class
A (Hz) 40 52
B (Hz) 54 68
C (Hz) 72 80
D (Hz) 90 —
E (Hz) — —
F (seconds) 180 300
G (seconds) 420 200
H (seconds) 180 460
J (seconds) 120 —
K (seconds) — —
(sec.)
Time
(R23251)
(Hz)
Frequency
C
D
E
B
F G H J K
A