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Control Specification SiUS121827E
116 Part 4 Functions and Control
4.12 Low Hz High Pressure Limit
Outline The system controls the upper limit of the frequency to prevent abnormal high pressure while the
frequency is low. Control is carried out according to three zones.
Details
Temperature varies depending on the outdoor heat exchanger temperature.
4.13 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
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 rooms not in operation
5. Dew prevention control for indoor rotor
Open Control
1. Electronic expansion valve control when starting operation
2. Electronic expansion valve control when the frequency changes
3. Electronic expansion valve control for defrosting
4. Electronic expansion valve control for oil recovery
5. Electronic expansion valve control when a discharge pipe temperature is abnormally high
6. Electronic expansion valve control when the discharge pipe thermistor is disconnected
7. Electronic expansion valve control for indoor unit anti-icing control
Feedback Control
Target discharge pipe temperature control
A 23 ~ 54°C (73.4 ~ 129.2°F)
B 22 ~ 53°C (71.6 ~ 127.4°F)
C 19 ~ 50°C (66.2 ~ 122.0°F)
A
B
C
Highest indoor
heat exchanger
temperature
among
operating rooms
Reset zone
Dropping zone
Keep
zone
(R14587)
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