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4-5-4 Defrost operation control
(1) Starting condition of defrost operation
Accumulated heating time has passed 40min and 20min after oil recovery operation,
and then when it meets either of following conditions.
Accumulated heating time is reset to zero by "cooling operation" and "end of defrost operation".
Condition 1) Accumulated time of TH4(Heat exchanger temperature sensor value)
Condition 2) Condition 2) Accumulated time of TH4(Heat exchanger temperature sensor value)
(2) Release condition of defrost operation
TH4(Heat Exchanger temperature sensor value) of all outdoor units
and passage of 20minutes
Defrost release temperature is calculated on the basis of TH12(Outdoor temperature sensor value).
( 5degC
Defrost release temperature
(3) Operation during defrosting
(Indoor unit)
EEV : Open FAN : Stop
(Outdoor unit)
FAN : Stop
Compressor : In operation
[ STEP 1 ]
Master : Inverter compressor operates. Slave1 and Slave2 : All compressors operate.
Defrosting
[ STEP 2 ]
Master : All compressors operate. Slave1 and Slave2 : All compressors stop after defrost operation.
Defrosting
If SW7-3(Setting up connecting capacity of indoor unit) is ON, the time is 90min.
temperature of starting defrost operation is over 10min.
temperature of starting defrost operation is calculated on the basis of
TH12(Outdoor temperature sensor value)
(Reference)
Outside air temperature = 5degC
Outside air temperature = 0degC
Outside air temperature = -5degC
and suction temperature of outdoor unit is lower than Judgment temperature
(it operates so that defrosting operation of master unit comes last.
Refer to following figure.)
Master
Slave 1
Defrosting
Master
Slave 1
Defrosting end
Temperature of starting defrost operation = - 8.0degC
Temperature of starting defrost operation = -11.5degC
Temperature of starting defrost operation = -19.0degC
12degC )
Slave 2
Defrosting
"Slave1 and Slave2 completed defrost operation" or
"STEP1 has passed 5min"
Slave 2
Defrosting end
04-09
-2degC is over 195min.
defrost release temperature,
Compressor
Stopped compressor
Compressor
Stopped compressor
in operation
in operation
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Troubleshooting
