TXV Replacement
TXV Replacement
(OP)
Hi,
i am trying to replace unknown model txv of 75ton trane chiller(one circuit),i fixed a 55ton (ove55-cp100- nominal)txv which is running in 125ton york chiller (two circuits),but parameters were:
suction pressure : 45 psi (very low)
leaving and return water temp: 40 c
condensing pressure : 220 psi
no buubles in sight glass
compressor 33% loaded
do you think the new txv is small,why it is running with that york chiller.
i also replaced liquid line solenoid valve befor that txv.
i am in saudi arabia with 47c ambient temp.
thanks.
i am trying to replace unknown model txv of 75ton trane chiller(one circuit),i fixed a 55ton (ove55-cp100- nominal)txv which is running in 125ton york chiller (two circuits),but parameters were:
suction pressure : 45 psi (very low)
leaving and return water temp: 40 c
condensing pressure : 220 psi
no buubles in sight glass
compressor 33% loaded
do you think the new txv is small,why it is running with that york chiller.
i also replaced liquid line solenoid valve befor that txv.
i am in saudi arabia with 47c ambient temp.
thanks.





RE: TXV Replacement
I'm not a real engineer, but I play one on T.V.
A.J. Gest, York Int./JCI
RE: TXV Replacement
I misinformed; There may even me some suction limiting or load limiting going on depending on the machine. I meant discharge limiting or load limiting not suction limiting. Although at 45 psig and R-22 that maybe the case, what is your low pressure cut out? It has to be pretty closed to that for comfort cooling chill water.
I'm not a real engineer, but I play one on T.V.
A.J. Gest, York Int./JCI
RE: TXV Replacement
Both chillers are air-cooled reciprocating compressor.
Trane chiller has 325psig high-pressure cutout,but for york chiller it is around 360psig.
Trane compressor suction temperature 30-35c.
How can i inspect the txv's cap.tube?
note: If there is no flow compressor suction must be very low but it is not.
RE: TXV Replacement
That's a pretty quick and easy method.
Let me reveiw your data; suction pressure is 45 psig, suction temperature is 30-35°C, water temperature is 40°C, ambient air is 47°C, discharge pressure is 220 psig. What is the temperature of your liquid line you should have about 15°F of sub-cooling. If the TXV is not working I would expect a high sub-cooling value. If it's low or zero I would suggest that your under charged. Before replacing a perfectly good TXV verify your charge.
I'm not a real engineer, but I play one on T.V.
A.J. Gest, York Int./JCI