9.8.8. Four-way Valve Error Detection Control
• The four-way valve error detection control starts when:
− During cooling operation, when indoor heat exchanger temperature exceeds 45°C in 5 minutes after compressor starts.
− During heating operation, when indoor heat exchanger temperature is below 5°C in 5 minutes after compressor starts.
• During four-way valve error, compressor is shut down and indoor unit is set to thermo-off status.
• After 3 occasions, four-way valve error is displayed; all operations stopped except outdoor fan remaining heat removal control.
9.8.9. 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 first
time when compressor starts operating continuously for 7 minutes).
− Indoor heat exchanger temperature at compressor start -3°C < current heat exchanger temperature for 1 minute.
• During this error, four-way valve error is displayed; compressor is shutdown.
9.8.10. High-pressure Switch Disconnection Error Detection Control
• High-pressure switch disconnection is detected when high-pressure switch input continuously open for 1 minute while the
compressor shutdown.
• During this error, high-pressure switch error is displayed.
9.8.11. Low-pressure Switch Disconnection Error Detection Control
• Low-pressure switch disconnection is detected when low-pressure switch input continuously open for 1 minute while
compressor shutdown.
• During this error, low-pressure switch error is displayed.
9.9. 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.
• To enable forced heating test run, at outdoor PCB, set the DS1 to ON position and DS2 to ON position.
• Press Test Run button for 1 second. SW1 located at outdoor printed circuit board.
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