449.7.7. Sensor Disconnection Detection Control• The sensor disconnection detection control activates when the following condition comply:• During sensor disconnection, sensor error is displayed; all operations stops except outdoor fan remaining heat removal control.9.7.8. Valve Error Detection Control• This control is to protect the compressor.• Valve error is detected if comply with condition below:- Power is on for the first time and within 5 minutes from compressor starts (However, the unit is considered power on for firsttime when compressor starts operating continuously for 7 minutes).- Indoor heat exchanger temperature at compressor start -3°C < current heat exchanger temperature for 1 minutes.• During this error, four-way valve error is displayed; compressor is shutdown.9.7.9. High-pressure Switch Disconnection Error Detection Control• High-pressure switch disconnection is detected when high-pressure switch input continuously open for 1 minutes while thecompressor shutdown.• During this error, high-pressure switch error is displayed.9.7.10. Low-pressure Switch Disconnection Error Detection Control• Low-pressure switch disconnection is detected when low-pressure switch input continuously open for 1 minutes whilecompressor shutdown.• During this error, low-pressure switch error is displayed.9.8. Test Run• Test run is necessary after installation is completed.• To enable forced cooling test run, at outdoor PCB, set the DS1 to ON position and DS2 to OFF position.• Press Test Run button at outdoor pcb for 1 second.Sensor Detection Threshold Duration (Sec.) Detection ConditionDischarge Temperature < -4.5°C or 201.8°C 5 Other than compressor start controland compressor ONOutdoor Heat Exchanger < -50.5°C or 103.7°C 5 Regularly
