Service
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141
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'10 • HM-T-149
Protective control/ anomalous stop control by compressor speed (frequency)
1) Compressor discharge pipe temperature protection
a) Protective control
If the discharge pipe temperature (detected with Tho-D) exceed the setting value, the compressor speed (frequency) is
controlled in order to suppress the rise of discharge pipe temperature.
100[95]
105[100]
Reduce compressor speed
at every 1minute
Release
Discharge pipe temperature (°C)
Retention
Note (1) Figures in [ ] are for model 140.
b) Anomalous stop control
i) If the discharge pipe temperature (detected with Tho-D) exceed the setting value, the compressor stops.
ii) When the discharge pipe temperature anomaly is detected 2 times within 60 minutes or 60 minutes continuously
including the time of compressor stopping, discharge pipe temperature error is displayed and E36 is recorded in
Error Log and it enters the anomalous stop mode.
Discharge pipe temperature (°C)
85
115
Compressor stop
Compressor operation
c) Reset of anomalous stop mode
When the discharge pipe temperature drops to the reset value of 85°C or lower for 45 minutes continuously, it
becomes possible to restart from controller
2) Cooling high pressure protection
a) Protective control
i) When the outdoor air temperature (Tho-A) is 40°C or higher and the outdoor heat exchanger temperature (Tho-R)
exceeds setting value, the compressor speed (frequency) is controlled in order to suppress the rise of high
pressure.
ii) The control value A is updated to an optimum value automatically according to the operating conditions
Control value A
54-60°C
Outdoor heat exchanger temperature (°C)
A
Reset
Reduce compressor
speed at every 1minute
b) Anomalous stop control
i) If the outdoor heat exchanger temperature (Tho-R) exceeds the setting value, the compressor stops.
ii) When the outdoor heat exchanger temperature anomaly is detected 5 times within 60 minutes, or 60 minutes
continuously including the time of compressor stopping, cooling overload error is displayed and E35 is recorded
in the Error Log and it enters the anomalous stop mode.
51
65
Compressor stop
Compressor operation
Outdoor heat exchanger temperature (°C)
c) Reset of anomalous stop mode
When the outdoor heat exchanger temperature drops to the reset value of 51°C or lower, it becomes possible to restart
from the controller.
Operation control function by the outdoor unit controller
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