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W-2WAY ECO-i SYSTEM
Control Functions
<Alarm Information>
(1) Discharge temperature protection alarm
This device sets an upper limit discharge temperature of 106°C for all compressors. When the discharge tem-
perature reaches 106°C, that compressor is stopped and restarted. If the same high discharge condition occurs
4 times, then an alarm occurs.
After a compressor has stopped, that compressor will not operate until the temperature has dropped to or
below the start-prohibit temperature.
Discharge temperature protection list
(2) Discharge sensor trouble detection control
An alarm occurs if the discharge temperature remains abnormally high (above 70℃), when the system has
been stopped for 60 minutes.
*In this case, possible causes include sensor failure and compressor overheating caused by an insufficient
level of refrigerant.
The alarm also occurs if the sensor temperature is at or above the abnormal temperature (80°C) when 20 min-
utes have passed after the compressor stopped.
* In this case, it is possible that the discharge temperature from a different outdoor unit is being detected, due
to an error in the installation of the discharge thermistor.
Discharge sensor failure list
Compressor No. Compressor 1 Compressor 2 Compressor 3
Type Inverter Constant-speed Constant-speed
Alarm display F04 F05 F22
Compressor No. Compressor 1 Compressor 2 Compressor 3
Type Inverter Constant-speed Constant-speed
Stop temp. 106℃ 106℃ 106℃
Start-prohibit temp. 70℃ 70℃ 70℃
Alarm display P03 P17 P18
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