Service manual

SiBE05-722_C Control Specification
Function and Control 41
3.3.3 Four Way Valve Operation Compensation
Outline At the beginning of the operation as the four way valve is switched, the pressure difference to
activate the four way valve is acquired by having output frequency which is more 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.
3.3.4 3-minute Standby
Turning on the compressor is prohibited for 3 minutes after turning it off.
(Except 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.)
Cooling Heating
A (Hz) 68 66
B (seconds) 45
A (Hz) 48
B (Hz) 64
C (Hz) 88
D (seconds) 240
E (seconds) 360
F (seconds) 180
(sec.)
Time
(R13528)
(Hz)
Frequency
C
B
DEF
A