Si12-714
Control Specification
Function and Control
85
3.11 Low Hz High Pressure Limit
Outline
Heat Pump Only
Set the upper limit of high pressure in a low Hz zone. Set the upper limit of the indoor heat
exchanger temperature by its operating frequency of Hz. Separate into three zones, reset zone,
keep zone and drooping zone and the frequency control must be carried out in such zones.
Detail
Separate into Zones
Note:
Drooping: The system stops 2 minutes after staying in the drooping zone.
3.12
Electronic Expansion Valve Control
Outline
The following items are included in the electronic expansion valve control.
Electronic expansion valve is fully closed
1. Electronic expansion valve is fully closed when turning on the power.
2. Pressure equalizing control
Room Distribution Control
1. Gas pipe isothermal control (distribution control in cooling)
2. SC control (distribution control in heating)
Open Control
1. Electronic expansion valve control when starting operation
2. Control when frequency changed
3. Control for defrosting (only for heat pump model)
4. Oil recover control
5. Control when a discharge pipe temperature is abnormally high
6. Control when the discharge pipe thermistor is disconnected
7. Control for indoor unit freeze-up protection
Feedback Control
1. Discharge pipe temperature control
Distribution control for each room
1. Liquid pipe temperature control (with all ports connected and all rooms being air-
conditioned)
2. Liquid pipe temperature control for stopped rooms
3. Dew prevention function for indoor rotor
