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67
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'11 • KX-T-166
(6)
Protective control
(a)
Discharge pipe temperature (Td) control
Discharge pipe temperature sensor (Tho-D1) monitors the discharge pipe temperature (Td) to avoid the rise of discharge
pipe temperature.
1)
Compressor capacity control
(i)
Start conditions
When all of following conditions are satisfied
When the compressor is ON state.
When it detects the discharge pipe temperature (sensed by Tho-D1) is higher than 120ºC
(ii)
Control contents
Whenever it detects the discharge pipe temperature is higher than 120ºC for 5 seconds, the capacity is decreased.
(iii)
End conditions
When any of the following conditions is satisfied
When the discharge pipe temperature (sensed by Tho-D1) drops below 110ºC
When the compressor is OFF state.
During the defrosting control
2)
Indoor EEV slightly open control at heating stop.
Rise of discharge pipe temperature (Td) is restarined by opening the indoor EEV during heating stop.
(b)
Over-current protection control (Current safe)
1)
If the input current value at the inverter inlet (converter inlet L3-phase) exceeds the setting value, the compressor
speed is reduced. If the higher value persists even after the speed reduction, the speed is reduced further.
2)
This control terminates when it is lower than the reset value for 3 minutes continuously or lower than the setting
value for 6 minutes continuously.
(c)
Power transistor temperature (PT) protective control
If the power transistor temperature exceeds 75°C, the compressor speed is controlled.
Speed is reduced once each minute
Retention
Release
72
75
Power transistor temp.(°C)
(b)
Time condition of defrosting
1)
Start conditions
Defrosting operation start when all of the following conditions are satisfied.
(i)
When 33 minutes of cumulative compressor operation time has passed since heating operation started.
(ii)
When 33 minutes of cumulative compressor operation time has passed since the previous defrosting ended.
(iii)
When 105 seconds has passed since the compressor turned ON from OFF status in heating mode.
(iv)
When the oil return condition has been established
(v)
Following cases are excluded.
When the upper limit frequency of the compressor protection start A or B is lower than the defrosting
frequency
During the normal compressor protection start
2)
End conditions
Defrosting operation stops when any of the following conditions is satisfied.
(i)
When 12 minutes has passed since defrost started
(ii)
When the outdoor heat exchanger temperature (sensed by Tho-R) is detected 10°C or higher continuously for
10 seconds
(iii)
When it has detected the high pressure (HP) ≥3.0MPa
