York screw chiller R-22
there are several causes we can consider in tripping of unit on auxillary sensor.the sensor device was designed to cut off source at specific limit of time or load.the over load sensor device was equipted to the main source specially on cmpressor of chiller to protect of burning the motor.
common causes of tripping off unit
1.high current on supply source.you can check this on one common line of compressor.using clamp ammeter.what ever reading you got when unit is running,compare this on rated current on manuals if high ampere was registered.ther is an overload supply the over load sensor will activate and cut off your unit.
a. source of overload is due to obstruction on refrigeration system,filter dryer are clogged,excessi9ve oil on high side.
b. themostat not cycles on,due to poor condensing fan, dirty condenser fin tube,or condeser insufficient cooling effect.
c. bearing,lubrication are not maintained usually on compressor on open type unit,
2. electrical wire and electronic control board short circuited.
a.sometime relay malfunction on cantactor w/c the supply souce intermittent either on one line supplying compressor,the compressor will suffer,it will just hum and trip off,
b.busted capacitor will trip off your unit,due to in the absence of starting motor.
this are common ways unit trip off, so regards and have a nice day,and one thing more don't forget to rate me, thank's
Apr 08, 2009 |