problems with a 230ton york air cooled screw
problems with a 230ton york air cooled screw
(OP)
I’m having problems with a YORK 230 ton air cooled screw machine.
M/N:YCAS0230EC46YFASB
Year:97
Roughly, for the past year, once every three months, it trips out ckt#2 with this fault message: “High DSCH Temp”. Now it is appearing more frequently.
According to troubleshooting guide in the maintenance manual, there are three things to look at: 1. Superheat is too high
2. Blocked air flow
3. Faulty sensor
We have checked all three areas, and they are all with in range
1. The superheat is normally 10-12 and 10-12 on the economizer
2. The condenser coils are clean as a whistle, with all 10 motors running properly
3. The sensors are on the money
We have tried other remedies:
1. Replacing the eprom on the processing board
2. Replacing the compressor’s oil filter
3. Adjusting the charge (removing gas, then adding gas)
4. The factory even came out and looked at it and they could not fix the problem.
This machine is one of three chillers all tied together to cool this facility
This is a link to the IOM
http://www.york.com/products/esg/ServiceLit/ywpubs/201.19-NM1.pdf
Can you give me any ideas of what we can do?
M/N:YCAS0230EC46YFASB
Year:97
Roughly, for the past year, once every three months, it trips out ckt#2 with this fault message: “High DSCH Temp”. Now it is appearing more frequently.
According to troubleshooting guide in the maintenance manual, there are three things to look at: 1. Superheat is too high
2. Blocked air flow
3. Faulty sensor
We have checked all three areas, and they are all with in range
1. The superheat is normally 10-12 and 10-12 on the economizer
2. The condenser coils are clean as a whistle, with all 10 motors running properly
3. The sensors are on the money
We have tried other remedies:
1. Replacing the eprom on the processing board
2. Replacing the compressor’s oil filter
3. Adjusting the charge (removing gas, then adding gas)
4. The factory even came out and looked at it and they could not fix the problem.
This machine is one of three chillers all tied together to cool this facility
This is a link to the IOM
http://www.york.com/products/esg/ServiceLit/ywpubs/201.19-NM1.pdf
Can you give me any ideas of what we can do?





RE: problems with a 230ton york air cooled screw
RE: problems with a 230ton york air cooled screw
RE: problems with a 230ton york air cooled screw
1 2 3 4 5 6
Wed. Wed. Tues, Thrus. Thrus. Thrus.
May 26 May 26 May 20 May 20 May 20 May 20
12:47pm 12:01pm 2:11pm 2:14pm 2:09pm 1:47pm
Shutdown Fault
System #1 No Fault
System #2 High DSCH Temp.
Leaving Water Temp 44.5 42.9 44.9 47 43.2 42.9
Return Water Temp 47 45 47.9 48.3 45 44.7
Delta Temp 2.5 2.1 3 1.3 2.8 1.8
Ambient Air 93.6 91.3 93.1 91.8 91 91
Lead Sys. 2 2 2 2 2 2
Comp. #2 on on on on on on
Run time 43 min 4 hrs. 17 min 6 hrs. 46 min 2 ins 19 min 3 hrs. 6 min.
FLA 56% 56% 57% 56% 56% 55%
Oil Pres. 220 216 221 220 214 211
Suction Pres. 66 64 68 67 64 63
Discharge Pres. 244 240 245 243 236 234
Oil Temp. 186 181 183 186 184 185
Suction Temp. 46 44 47 47 44 44
Discharge Temp. 260.3 260.2 260.1 260.3 260.2 260
Sat. Suct Temp. 38.6 36.9 39.8 39.2 36.9 36.5
Suct Superheat 8 7.8 7.6 8.4 7.3 7.5
Sat. Disc Temp. 115.4 114.3 115.8 115.2 113.7 112.5
Disc Superheat 144.7 145.8 144.5 145 146.5 147.6
Slide Valve Step 48 12 75 75 14 18
Economizer off off off off off off
# of Fans 2 2 2 2 2 2
RE: problems with a 230ton york air cooled screw
RE: problems with a 230ton york air cooled screw
RE: problems with a 230ton york air cooled screw
RE: problems with a 230ton york air cooled screw
the hydraulic 3 way valve ,which loads and unloads the compressor,was sticking.
we replace part and the machine is now running properly
RE: problems with a 230ton york air cooled screw