York YHKJXH012BAM--FX Service Manual page 108

3.6 Frequency control when Td is too high
Purpose : make compressor frequency control if the discharging temp. is too high, to low
the discharging temp. efficiency and ensure the system can run normally.
118℃
115℃
112℃
109℃
105℃
95℃
3.7、 Frequency control when there is CT over current
1.00I
0.95I
0.93I
0.90I
0.88I
0.85I
3.8 Oil return operation control
3.8.1 Entering condition
When the compressor running frequency is lower than 58Hz continuously in all and outdoor
unit Tcm is lower than 50 degree for 5 hours, the system will enter oil return operation. In the
course of mode changeover, manual unit stop or protective unit stop, the time will be
accumulative. After compressor restarts up, the time will counted continuously. In counting
time for 5 hour, if the compressor running frequency is over 80Hz for 10 minutes continuously,
the time will be cleared. Also after the heating defrosting , the time will be cleared.
If keeps for 10s, the unit stops. 3 minutes later, the
unit can re-startup. If in 60 minutes the unit occurs
alarm for 3 times, the failure can be eliminated
Reduce FQY rapidly 2HZ/S
Reduce FQY rapidly 1HZ/S
Reduce FQY slowly 1HZ/10S
Remain FQY
Increase FQY slowly 1HZ/10S
Stop immediately, if abnormal stop 3 times in an
hour, the unit will be stop and alarm .
Reduce FQY rapidly 2HZ/S
Reduce FQY rapidly HZ/S
Reduce FQY slowly 1HZ/10S
Remain FQY
Increase FQY slowly 1HZ/10S
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