TS13-01 Troubleshooting manual 9
FTXN-LV and RXN-LV:
DEFROST CONTROL
- Condition for entering defrost
• Compressor minimum run time – 6 minutes OR
• Compressor accumulated run time of 45 minutes if OD coil < 3C.
• When OD coil < 0C AND OD coil < OD air - 10C.
- Condition for terminating defrost
• OD coil > 12C or
• Total defrost timer of 650 seconds.
OUTDOOR FAN CONTROL
- Determine from
• Compressor target rotation: higher fan speed with higher rotation.
• Outdoor air temperature.
- Cool mode: Higher fan speed with higher outdoor air temperature.
- Heat mode: Higher fan speed with lower outdoor air temperature.
- When compressor stops, fan OFF delay 30 seconds is carried out
INDOOR COIL FREEZE PREVENTION
- Only available in cooling mode.
- When the indoor coil temperature < 2°C, the compressor starts to drop the frequency.
- This protection will cut in when:
• Indoor coil temperature < 0°C for more than 180s. Compressor will stop, OD fan stop after 30s
and indoor fan can only run at lowest fan speed.
- The unit can only be restarted after 3 minutes.
- When the indoor coil temperature > 13°C, the compressor frequency will be reset based on the OD
ambient, room and set temperature.
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