Compressor Recovery Operation - Fujitsu R407C Service Manual

3-1-4 COMPRESSOR RECOVERY OPERATION

If compressor 1, 2, or 3 fails, or if two compressors fail at the same time, the remaining compressor(s)
perform recovery operation to prevent interruption of air conditioning system operation by a failure.
When compressor 1, 2, or 3 is judged to be faulty, the system is operated by switching the compressor output
pattern (compressors 0 to 6) as shown in the following table.
Compressor failure is displayed by LEDs on the PCB of the outdoor unit and by output ERROR to the
communication bus line (standard wired remote controller, central remote controller, PC controller).
(a) When compressor 1 (2 HP) fails (compressor 2 is substituted for compressor 1)
(b) When compressor 2 (4 HP) fails (compressor 3 is substituted for compressor 2)
(c) When compressor 3 (6 HP) fails (compressor 1 and 2 are substituted for compressor 3)
Compressor recovery operation
ORDINARY OPERATION
Step 0
Step 1
Step 2
Step 4
Step 5
Step 6
Step 7
*
The character X represents the compressor(s) which was(were) stopped by a protection
function or compressor error while the number(s) represent(s) capacity (in horse power)
of the compressor(s) by which the recovery operation can be performed.
RECOVERY OPERATION
* *
(a)X-4-6 (b)2-X-6 (c)2-4-X
Step 0 Step 0 Step 0
Step 2 Step 1 Step 1
Step 2 Step 4 Step 2
Step 4 Step 4 Step 3
Step 6 Step 5 Step 3
Step 6 Step 5 Step 3
Step 6 Step 5 Step 3
03-02
*
* *
(d)X-X-6 (e)X-4-X
Step 0 Step 0
Step 4 Step 2
Step 4 Step 2
Step 4 Step 2
Step 4 Step 2
Step 4 Step 2
Step 4 Step 2