PDA

View Full Version : 30rb p.16-p.18 alarm intermittent


isitfriday
11-09-2009, 04:07 PM
Im having problems with a 170 ton 30rb chiller. The alarms are p.16-p.18 (compressor A1,A2,A3 not started or pressure not established). Ive logged all info in alarm history and the compressors fail on different days. Ive checked all transducers, control voltage, incoming power,ect without solving the issue.Since the problem only occurs with A circuit, I'm leaning more towards the com wire from the MBB ( J9C) to SPMA1 ( JP1) being the culprit. Would a loss of comm to SPM board be generated? Possibly a nick in the wire causing intermittent short. Another is possibly the dielectric grease on the press transducers. Has anyone else experienced these problems? If so, your info is much appreciated.
licensed to chill
11-09-2009, 04:23 PM
Replace suction and discharge transducers as a set for circuit "A".
I have already had 3 machines with the same problem.
isitfriday
11-09-2009, 04:34 PM
TNX for the info. I didn't expect such a quick response. That fixed the problem I guess?
Dallas Duster
11-09-2009, 05:02 PM
Does the circuit run after you reset it?
isitfriday
11-09-2009, 07:41 PM
Yes, after reset all compressors will run. I disabled B circuit compressors so circuit A compressors would stage on ( B circuit handling the load at time of reset and wanted to simulate normal staging condition without placing chiller in test mode). I've also ran all compressors in test mode without failure.
Dallas Duster
11-09-2009, 07:59 PM
Were the addresses correct on your spm boards? What style of connectors do you have on your transducers? Yes a spm not communicating will generate and alarm. Do you have full model and serial number?
isitfriday
11-09-2009, 10:12 PM
30RBA17064B5B7-7 2208Q86142 All addresses were correct. I guess they are the old style transducers similar looking to the 30RA transducers. I can get a part# off of them tomorrow.
Dallas Duster
11-09-2009, 11:23 PM
I know what they are don't worry about the part numbers. If you want to you could swap Circuit B's transducers with A and see if the problem follows.
isitfriday
11-10-2009, 06:22 AM
OK I thought about that. Should I just swap transducer bodies or upper part also? TNX for your advice.
Dallas Duster
11-10-2009, 07:46 AM
Transducer only.
lirunaway
01-12-2010, 10:43 PM
Does the chiller have control of the chill water pumps?
Are you in NC?