53
Fault Handling
The second compressor in a parallel system can only be started when the ambient temperature
＜
-10
℃
and the return water temperature
≤
30
℃
;
If 2 compressors are running in a parallel system, one will be shut off mandatorily if the ambient temperature
＜
-10
℃
and the return water tem
-
perature
≥
35
℃
.
B Low temperature unit
The ambient temperature protection range for low temperature module unit: cooling: 16
℃
~50
℃
; heating: -28
℃
~26
℃
.
For cooling startup:
The second compressor in a parallel system can only be started when the ambient temperature
＞
43
℃
and the return water temperature
≤
15
℃
;
If 2 compressors are running in a parallel system, one will be shut off mandatorily if the ambient temperature
＞
43
℃
and the return water tem
-
perature
≥
18
℃
.
12.Compressor operation protection and average wear
The minimum time from start to stop of any compressor during normal operation is the
"
Minimum operation time of compressor
"
.
The minimum time from stop to start of any compressor is the
"
Minimum stop time of compressor
"
.
For CXAJ130 unit:
Upon each startup of the unit, the compressor with minimum total working hours among the four compressors will be selected as the first
compressor to be started; then the compressor with less total working hours of the two compressors in the other system will be selected as the
second compressor to be started; then the remained compressor in the system where the first compressor is picked will be selected as the third
compressor to be started; the final compressor will be the fourth to be started. The order is reversed for unloading.
For CXAJ065/045 unit:
Upon each startup of the unit, the compressor with less total working hours of the two compressors will be selected as the first compressor to be
started; the remained compressor will be the second to be started. The order is reversed for unloading.
13.Power supply protection
Phase failure and phase loss detection for 3-phase power supply (once only upon power-on).
The corresponding unit will be shut down if power supply protection is activated;
14.Insufficient flow protection
All the units will be shut down if insufficient flow alarm is triggered;
15.Current protection
The protection current of regular compressor is set to 23A; the protection current of low temperature compressor is set to 27A/29A.
If the measured current I
≥
protection current, the corresponding system will be shut down and an overcurrent protection alarm will be sent.
16.Excessive air exhaust temperature protection
A. Normal temperature unit:
If the air exhaust temperature of any system is
＞
125
℃
for 10s, it will be identified as excessive air exhaust temperature, the system will shut
down and send an alarm.
B. Low temperature unit:
If the air exhaust temperature of any system is
＞
135
℃
for 10s, it will be identified as excessive air exhaust temperature, the system will shut
down and send an alarm.
