Operating State Of Each Part During Defrosting Operation; All Compressors Sart The Operation In Defrosting - Fujitsu Airstage VR-II Series Service Manual

< 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 sart the operation in defrosting

Master
EEV1: 300 pls
EEV2: 480 pls
Defrosting
[ STEP 2 ]
When one of the heat exchanger reached to the End condition, the expansion valve open pls will be set as smaller pls to
make it easier for refrigerant distribution to another heat exchanger.
Master
EEV1: 200 pls
EEV2: 330 pls
Defrost end
[ STEP 3 ]
When the defrosting of all outdoor units ends, all outdoorunit stop.
The start rotation excution is done, and restarts
Master
EEV1: 0 pls
EEV2: 0 pls
Defrost end
On Defrost operatiom
All compressor start
Cndensor (OFF)
Stops
EEV1: 300 -> 200 pls
EEV2: 480 -> 330 pls
100 - 500 pls
Close
Slave 1
HEX1 HEX1
EEV1: 300 pls
HEX2 HEX2
EEV2: 480 pls
Defrosting
Slave 1
HEX1 HEX1
EEV1: 300 pls
HEX2 HEX2
EEV2: 480 pls
Defrosting
Slave 1
HEX1 HEX1
EEV1: 0 pls
HEX2 HEX2
EEV2: 0 pls
Defrost end
Slave 2
HEX1
EEV1: 300 pls
HEX2
EEV2: 480 pls
Defrosting
Slave 2
HEX1
EEV1: 200 pls
HEX2
EEV2: 330 pls
Defrost end
Slave 2
HEX1
EEV1: 0 pls
HEX2
EEV2: 0 pls
Defrost end
02-13
Finishing process
All compressor operaiotn Stop
Keeps the operation mode
Stops
0 pls
0 pls
Open
Compressor in operation
Stopped compressor
HEX in defrosting
HEX Defrost end