Ballu KFR-28GW/BP Series, Service Manual

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7.CONTROL MODE
6. Perfect protection functions of the air conditioner
1. Abnormal sensor:
In case an indoor or outdoor sensor is short circuited or open circuited, the compressor gets stopped.
2. Abnormal IPM (power module)
In case IPM gets in trouble such as overheat (100 ), overcurrent (28A), short circuit (51A) and too low
drive voltage (12.5V), both the compressor and outdoor fan motor stop, and the trouble code is displayed.
3. Compressor exhaust temperature protection
Compressor exhaust temperature 120 , the compressor is interrupted and
the trouble is displayed;
Compressor exhaust temperature 105 , the compressor frequency goes down;
96 compressor exhaust temperature 104 , the compressor frequency
Is prohibited from ascending.
4. Total current control
When the outdoor unit's AC supply current exceeds a preset value, the compressor frequency goes down. If
the current in the compressor continues to rise, the compressor is interrupted. The current settings is
tabulated below (the figure in the bracket is the off current):
Cooling Heating
Single Double Single Double
14A (17A) 8A (11A) 17A (19A) 10A (12A)
5. Protection against abnormal supply voltage
When the AC supply voltage is higher than 260 V or lower than 145 V, the compressor is interrupted, and
the trouble code is displayed.
6. Protection against instantaneous interruption
In case of instantaneous interruption of the AC supply, the compressor is interrupted and the trouble code is
displayed.
7. Time delay protection
After a stop of the compressor, there must be a 3 minutes delay to restart the compressor. But when
powered on for the first time, the compressor must be started immediately.
8. Communication in trouble
If the outdoor unit receives no effective communicating signal from the indoor unit after being started, the
outdoor will run in the condition that the indoor unit is shut down.
9. Indoor fan motor in trouble
If the indoor micro-computer judges that the motor is being stopped, locked or running with abnormal
shake upon the position signal of the indoor motor's rotor, it will cut off the drive signal of the indoor fan,
and the indoor unit will stop itself and restart several minutes later.
10. Overload control
Tindoor coil pipe 65 , the compressor stops;
The indoor heat exchanger temperature 56 , the outdoor blow rate
turns to the low rate, and the compressor frequency goes down;
56 the indoor heat exchanger temperature 53 , the
compressor frequency is prohibited from ascending.
11. Anti-freezing
2 T indoor coil pipe 5 , the compressor frequency is prohibited from ascending;
1 T indoor coil pipe 2 , the compressor frequency goes down;
T indoor coil pipe 1 , the compressor is interrupted and the trouble alarm is given.
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