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Service Manual SM-Inverter_(i)
9
ATXN/FTXN-LV and ARXN/RXN-LV(1B/1B9):
DEFROST CONTROL
-
Condition for entering defrost
•
Compressor minimum run time – 6 minutes OR
•
Compressor accumulated run time of 45 minutes if Outdoor coil < 3
°
C.
-
Condition for terminating defrost
•
OD coil > 12
°
C 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.
Summary of Contents for SM-12-012
Page 1: ...Service Manual SM Inverter_ i Air Conditioners Service Manual Split Inverter SM 12 012...
Page 22: ...Service Manual SM Inverter_ i 22...
Page 26: ...Service Manual SM Inverter_ i 26...
Page 45: ...Service Manual SM Inverter_ i 45 Troubleshooting...
Page 47: ...Service Manual SM Inverter_ i 47...
Page 50: ...Service Manual SM Inverter_ i 50 ATXN FTXN 50 60 LV1B 9 ARXN RXN50 60 LV1B 9...
Page 51: ...Service Manual SM Inverter_ i 51 Refrigerant Diagram ATXN FTXN 25 35 50 60 LV1B 9...