Mitsubishi Heavy Industries FDTCVA SERIES Technical Manual page 180

(iii) Defrosting end conditions
If any of the following conditions is satisfi ed, the defrosting operation fi nishes.
1) 8 minutes and 20 seconds have passed since defrosting started. (In models 302, 802 and 1002, 10 minutes and 20
seconds have passed.)
2) When the outdoor heat exchanger temperature (sensed by Tho-R1, R2, whichever one senses the lower temperature)
is 12°C or higher continuously for 10 seconds.
(g) Compressor protective control
(i ) Discharge pipe temperature control
If the dischage pipe temperature (Tho-D) becomes higher than the set temperature during compressor operation, the
compressor speed is reduced to cool it down.
1) Compressor speed control
2) Anomalous stop by the discharge pipe temperature
a) If the discharge pipe temperature has risen to 115 (135) °C or higher, the compressor is stopped. If it drops to
85 (90) °C or lower, the compressor restarts automatically.
Compressor operation
b) If the condition a) occurs 2 times within 60 minutes, or the temperature is kept at 115 (135)°C or higher for 60
minutes continuously, anomalous stop (E36) occurs.
Note (1) If the temperature does not drop to 85 (90) °C or lower continuously for 45 minutes after a discharge pipe temperature error occurs,
operation cannot be restarted. (This can be set using the remote controller.)
(ii) Power transistor temperature control
If the power transistor temperature (Tho-TR) rises to 85°C or higher, the compressor speed is controlled. If the power
transistor temperature drops to 81°C or lower, this control ends and the speed protection cancel operation starts.
The speed is reduced once every minute
Retention
Reset
100 (105) 105 (110)
Discharge pipe temperature (˚C)
Compressor stops
85 (90) 115 (135)
Discharge pipe temperature (˚C)
The speed is reduced once every minute
Retention
Reset
81 85
Power transistor temperature (˚C)
179
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Note (1) Values in the bracket show the one for 802 and 1002 models
Note (1) Values in the bracket show the one for 802 and 1002 models
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