Fujitsu AUXB04GALH Service Manual page 41

< Operating state of each part during defrosting operation >
Actuator Preparation process
All compressor operaiotn Stop
Compressor
Change Condensor (OFF)
Heat Ex(4WV)
Stops
FAN
0 pls
EEV1
EEV2
0 pls
EEV3
Open (Balancing)
SV1,SV2
[ STEP 1 ]
All compressors operates and it defrosting.
Master
INV
Defrosting
[ STEP 2 ]
Outdoor units which satisfied the defrosting end judgment temperature
are operated at the lowest speed (20rps) for inverter compressor.
Master
INV
Defrost end
[ STEP 3 ]
When the defrosting of all outdoor units ends, all outdoor unit stop.
The start rotation execution is done, and restarts.
Master
INV
Defrost end
On Defrost operatiom
All compressor start
Condensor (OFF)
Stops
EEV1: 300 pls
EEV2: 480 pls
100 - 500 pls
Close
Slave 1 Slave 2
INV INV
Defrosting Defrosting
Slave 1 Slave 2
INV INV
Defrosting Defrost end
Slave 1 Slave 2
INV INV
Defrost end Defrost end
02-13
Finishing process
All compressor operaiotn Stop
Keeps the operation mode
Stops
0 pls
0 pls
Open
Compressor in operation
Compressor in operation
Compressor operate by
the lowest speed (20rps)
Stopped compressor