Control Specification
SiENBE07-618_C
32
Function and Control
3.3
Controls at Mode Changing / Start-up
3.3.1 Preheating Operation
Outline
The inverter operation in open phase starts with the conditions of the outdoor temperature, the
discharge pipe temperature, and the radiation fin temperature (internal temperature of PM1).
Detail
Outdoor temperature
≥
10°C
→
Control A (preheating for normal state)
Outdoor temperature < 10°C
→
Control B (preheating of increased capacity)
Control A
ON condition
Discharge pipe temperature < 6°C
Radiation fin temperature < 85°C
OFF condition
Discharge pipe temperature > 8°C
Radiation fin temperature
≥
90°C
Control B
ON condition
Discharge pipe temperature < 10.5°C
Radiation fin temperature < 85°C
OFF condition
Discharge pipe temperature > 12°C
Radiation fin temperature
≥
90°C
3.3.2 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.
3.3.3 Four Way Valve Operation Compensation
Outline
At the beginning of the operation as the four way valve is switched, the differential pressure 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 starting compressor for heating.
2. When the operation mode changes to cooling from heating.
3. When starting compressor for defrosting or resetting.
4. When starting compressor for the first time after the reset with the power is ON.
5. When starting compressor for heating next to the suspension of defrosting.
6. When starting compressor next to the fault of switching over cooling / heating.
Set the lower limit frequency
Hz for
seconds with any conditions 1 through 6 above.
(Hz)
(seconds)
48
70
SIENBE07-618_C_FRONT.pdf 44
9/02/2011 9:25:05
