SiBE121135_A Control Specification
Function and Control 122
4.11 Low Hz High Pressure Limit
Outline The upper limit of high pressure in a low Hz zone is set. The upper limit of the indoor heat
exchanger temperature is also set by the operating frequency. Zones are divided into three,
reset zone, keep zone, and dropping zone, and the frequency control is carried out according to
each zone.
Detail
Note: Dropping: The system stops 2 minutes after staying in the dropping zone.
4.12 Outdoor Electronic Expansion Valve Control
Outline The following items are included in the outdoor electronic expansion valve control.
Outdoor electronic expansion valve is fully closed
1. Outdoor electronic expansion valve is fully closed when turning on the power.
2. Pressure equalizing control
Room Distribution Control
1. Gas pipe isothermal control
2. SC (subcooling) control
3. Liquid pipe temperature control (with all ports connected and all rooms being air-
conditioned)
4. Liquid pipe temperature control for stopped rooms
5. Dew prevention control for indoor rotor
Open Control
1. Outdoor electronic expansion valve control when starting operation
2. Outdoor electronic expansion valve control when the frequency changes
3. Outdoor electronic expansion valve control for defrosting
4. Outdoor electronic expansion valve control for oil recovery
5. Outdoor electronic expansion valve control when a discharge pipe temperature is
abnormally high
6. Outdoor electronic expansion valve control when the discharge pipe thermistor is
disconnected
7. Outdoor electronic expansion valve control for anti-icing control for indoor unit
Feedback Control
1. Target discharge pipe temperature control
40/50/52/58/68/75 class 80/90 class
A (°C) 60 57
B (°C) 59 56
C (°C) 56 53
A
B
C
Highest indoor
heat exchanger
temperature
among
operating rooms
Reset zone
Dropping zone
Keep
zone
(R14587)
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