9.7.9. Time Delay Safe Control
• The compressor will not start for three minutes after stop of operation.
9.7.10. Outdoor Fan Remaining Heat Removal Control
• When compressor stops, outdoor fan operates at High speed for 1 minute to remove the remaining heat.
9.7.11. Crank Case Heater Control
• Crank case heater ON when the compressor is shutdown and discharge temperature is 20°C to prevents the refrigerant solving
into compressor oil inside the compressor shell at cold condition.
9.7.12. Pump Down
• To enable pump down operation, at outdoor PCB, set the DS1 and DS2 to OFF position.
• Press Test Run button for 1 second. SW1 located at outdoor printed circuit board.
• During Pump Down operation, push the Test Run button again for 1 second to stop the pump down operation.
• The pump down operation runs for 10 minutes.
9.8. Protection control
9.8.1. Outdoor Low-pressure Protection Control
• The purpose of low-pressure protection control is gas leakage detection control.
• The low-pressure protection control starts when low-pressure switch is activated less than 15 minutes after compressor startup.
During heating operation or deice control low-pressure detection does not start.
• During this protection control, compressor is shut down, indoor unit is set to thermo-off status.
• After 6 occasions, suction pressure error is displayed; all operations stopped except outdoor fan remaining heat removal
control.
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