Hi guys...I got a few questions for ya. We service a location with a York YT that is run with a TM2. Last year, it broke down and the customer had someone else come and look at it and in the end, the logic board got changed out. I never saw it run after the work was done last year, so I don't know if it started after the repair. At the time, I didn't have any info on the TM2 and even though I came across some info (thanks to you guys here) I still don't think I would have been able to do much good with it. At any rate, this year the chiller got flipped on by their people and the chiller has a major vibration. I discovered this while at the site installing a vfd on a fan. I couldn't believe we weren't called on this because of how differently it was running than normal. It's actually pretty baffling to me- every time it ramps up this vibration acts different and on one of the starts it was not even there until a bit after it got to speed. What is strange about it is that it sounds very similar to another experience I had where an old soft start went bad and was getting to speed but it sounded like it was single phasing. My more concise question is this...can an issue with the TM2 make it sound like there's a problem with the compressor? Looking at the teardown manual, the comp doesn't look all that complicated as far as the drive line.
Some more observations are: On coast down the vibration seems to stop as soon as the motor shuts down (using the old screwdriver listening trick). The vibration frequency doesn't seem to change with vfd speed (just going by ear, no vibe analysis). Spinning the compressor by hand , I don't hear anything unusual and it spins pretty easily. The motor is in good shape bearing wise, but I can hear this vibration in it while it's running...in fact it's in the whole machine. I tried disconnecting the drive coupling and starting the motor to see if it was present, but it didn't seem to be- seemed to ramp up smoothly. While online, seems to be noise in the gear box and very apparent in the suction elbow. The shaft seal has a very apparent oil leak.
I can tell you that this chiller has been fairly neglected. We insist on annual oil changes...finding and repairing any leaks.. usual stuff, but man is it tough to get these guys to do anything- and per the typical, now that it's down it's a super emergency. Spend a dollar to save a dime kind of crap. The chiller model is YTH3J3E2-CRD used for a/c