Control Specification SiBE121021_C
116 Function and Control
4.3 Controls at Mode Changing / Start-up
4.3.1 Preheating Operation
Outline The inverter operation in open phase starts with the conditions of the preheating command from
the indoor, the outdoor temperature, and discharge pipe temperature.
Detail ON Condition

When outdoor temperature is below 10.5°C and discharge pipe temperature is below
10.5°C, the inverter operation in open phase starts.
OFF Condition

When outdoor temperature is higher than 12°C or discharge pipe temperature is higher than
12°C, the inverter operation in open phase stops.
4.3.2 Four Way Valve Switching
Outline In heating operation, current is conducted, and in cooling and defrosting, current is not
conducted. In order to eliminate the switching sound when the heating is stopped, as the four
way valve coil switches from ON to OFF, the OFF delay switch of the four way valve is carried
out after the operation stopped.
Detail OFF delay switch of four way valve:
The four way valve coil is energized for 150 seconds after the operation is stopped.
4.3.3 Four Way Valve Operation Compensation
Outline At the beginning of the operation as the four way valve is switched, acquire the differential
pressure to activate the four way valve by having output frequency which is more than a certain
fixed frequency, for a certain fixed time.
Detail Starting Conditions
1. When starting compressor for heating.
2. When the operation mode changes from the previous time.
3. When starting compressor for defrosting or resetting.
4. When starting compressor for the first time after the reset with the power is ON.
Set the lower limit frequency to around
A
Hz for 70 seconds with any conditions 1 through 4
above.
4.3.4 3-Minute Standby
Turning on the compressor is prohibited for 3 minutes after turning off.
(Except when defrosting.)
A (Hz)
50/52/58 class 48
68/75 class 40
80/90 class 28
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