Compressor Sequence Operation - Fujitsu Airstage V-II Service Manual

2-2-4 Compressor Sequence Operation

Make a starting sequence and start and stop the compressors in accordance with that sequence.
Starting sequence n : Compressors are started at nth and stopped nth from the end
Example) Starting sequence
Starting sequence
Make a sequence such that the INV compressors are always started before constant
speed compressors.
Operate so that the speed of the operating INV compressors is the same.
(May also vary with the upper limit & lower limit speed restriction)
Rotate the stating sequence under the following conditions:
(1) Defrosting
(2) Oil recovery
(3) When cooling discharge temperature is high
Run command
INV CONST. INV CONST.
INV CONST. INV CONST.
INV CONST. INV CONST.
INV CONST. INV CONST.
INV CONST. INV CONST.
INV CONST. INV CONST.
INV CONST. INV CONST.
INV CONST. INV CONST.
INV CONST. INV CONST.
: Compressor started first, compressor stopped last
: Compressor started 2nd, compressor stopped 2nd from the end
Starting rotation
execution
INV CONST.
Stop
INV CONST.
Start
INV CONST.
Start
INV CONST.
Start
INV CONST.
Start
INV CONST.
Stop
INV CONST.
Stop
INV CONST.
Stop
INV CONST.
Stop
INV CONST.
Start
INV CONST.
Start
INV CONST.
Start
INV CONST.
Start
INV CONST.
Stop
INV CONST.
Stop
INV CONST.
Stop
INV CONST.
Stop
INV CONST.
Start
02-05
Stop Compressor
Operation Compressor
CONST. : Constant speed compressor
INV : Inverter compressor
INV CONST. INV CONST.
INV CONST. INV CONST.
INV CONST. INV CONST.
Oil recovery
Starting rotation
execution
INV CONST. INV CONST.
INV CONST. INV CONST.
INV CONST. INV CONST.
INV CONST. INV CONST.
INV CONST. INV CONST.
Start
Start
Start
(example)
Start
Start
Start
Start
Stop