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23-10-2007, 11:55 AM #1
Trane chiller tripping on "LOW EVAPORATOR REFRIGERANT TEMP"
Hi
I have a ~8yr old Trane ERTHA300 (rotary screw chiller) used for mall air-conditioning in South East Asia. (ambient: 30C, 90%RH)
It has been running fine for at least the past 3 years, but recently, it is always tripping after about 15-30 minutes of running:
starts with status A74 (normal running),
15 minutes later status changes to A77 "Run: evaporator limit(3)"
3 minutes later it trips on status bFb "Low evaporator refrigerant temp"
Water temperatures in and out of the evaporator and condenser seem normal.
Evap water in/out: 11-13C / 7-8C
Cond water in/out: 27-30C / 31-34C
Any ideas?
Some possibilities I've thought of:
- dirty evaporator heat exchange tubes causing large approach
- bad thermistor under-reporting evap refrigerant temp
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