Ballu KFR-2501G/Y2BPE, Service Manual

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3.6 Abnormal power supply voltage protection
When the supply voltage is above 260V or below 150V, the compressor stops,
and the trouble code is displayed.
3.7 Overhot protection for the indoor heat exchanger
When the temperature of the indoor coil 70 , the compressor will stop;
When the temperature 55 , the outdoor flow speed will turn to the low speed, and
the compressor runs at the descending frequency;
When the temperature 52 and 55 , the compressor will prohibit the frequency
from rising.
3.8 Anti-frost protection for the indoor heat exchanger
Refer to the cooling cycle.
3.9 Momentary interruption protection for power supply
When the power supply lacks the cycle or is interrupted, the compressor stops
running, and the trouble code is displayed.
3.10 Start delay protection: When restarting the machine, the start is delayed for 3
minutes for protection.
3.11 Communication trouble: when the outdoor unit is turned on, the indoor unit will
shut down the indoor unit 3 minutes later if the indoor unit has not received an
effective communication signal which returns from the outdoor unit. And at the
same time the trouble code is displayed. After another 3 minutes, the outdoor
will be powered on again. Once the communication returns to normal, the trouble
code will be cleared.
3.12 The trouble in the indoor fan motor: when the indoor micro-computer, depending
on the position of the rotor of the indoor motor, determines the motor is in
stoppage, lock or abnormal vibration state, the micro-computer will cut off the
driving signal of the indoor fan. 3 minutes later, it is restarted. If the trouble
occurs 4 times within 30 minutes, the air conditioner will stop, and the trouble
code will be displayed. It can not be restarted unless being powered on again.
8. TROUBLESHOOTING
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