Johnson Controls YJHJXH024BARR-FX, Service Manual

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Function and Control
Domestic Air Conditioner
25
defrostings is 45 minutes (the time interval which is in 57 digits in EEPROM can be adjusted ˅
When the result of C×TA ˉ α is in the scope of C×TA ˉ α<-15 , the time interval between two ć
defrostings is 65 minutes.
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When starting defrosting, the compressor stops for 1 minute at first, and the outdoor fan is running,
after 55 seconds, the four-way valve is off.
When the compressor is started, the outdoor fan is stoped, the compressor stops for 30 seconds at
the conditions of 58HZ, and then runs towards the target frequency—88HZ.
During defrosting period, the protections, such as current of the compressor, compressor’s blowing
and so on, are in effect. During defrosting period, the compressor which is stoped because of
protection or malfunction will reinstate after stoping for 3 minutes, and don’t clear the cumulated run
time. When it is satisfied with the continuously running time, it will enter into the defrosting mode.
After entering into defrosting mode, make sure the compressor runs for at least for 2 minutes, and
then it can withdraw from defrosting.
If a single machine causes defrosting, the other machines all involve in defrosting.
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The defrosting operation will change to heating operation, if any of the following conditions is satisfied:
˄ 1 ˅˖ The temperature of the outdoor heat exchanger is continuously over 7 for 80 seconds. ć
˄ 2 ˅˖ The temperature of the outdoor heat exchanger is continuously over 12 ć for 5 seconds.
˄ 3 ˅˖ Continuously run defrosting for 11 minutes ˄ 56 digits in EEPROM can be adjusted ˅ .
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The compressor stops, the outdoor fan is started, and the four-way valve is closed, after 60 seconds
the compressor runs according to the starting process.
5.2.6 Protection function
5.2.6.1
˖
TTC high temperature-preventing protection
Once the machine is started, it can run TTC overheating protection of air-blowing, but air-blowing
sensor malfunction must alarm after 4 minutes during which the compressor is started (during the
course of self-detection, there’s no such limitation)
Sensor detection methods: 100 times (one cycle of procedure run is one time, and about 5ms,
detection method for each time: continuously sampling for 8 times, then order them and take the
mean value of the middle 2 values), take the mean value.
TTC
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117 Abnormal stop
Decreasing the frequency rapidly
˄
1HZ/second
˅
112
Decreasing the frequency slowly (1HZ/10seconds)
108
105 The frequency doesn’t change.
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