Has anybody had any problems with "York YCAS0440 R-22,460v, Wye Delta." chiller tripping off on low curr/mp/hp, alarm.
I Check the LED on the 2ACE Motor Protector Display and it has a code "5" HIGH MOTOR TEMP.
This only happens during high ambient conditions of around 106deg. and above.
I have 2 chillers, with a total of 8 circuits, and all the circuits do the same thing. These chillers were installed in 2001, but were not put in service until 2009.
I have been through 2 summers so far, and for about 2 days during each summer it can get over 105deg. and the circuits will start to trip off, which can get pretty bad do to the fact they are the main cooling for a large data center.
99% of the time they run ok. "Well sorta...(3)- transducers, (3)-capacity control valves, (1)-I/O expansion board #2, (1)-comp.vent kit, (1)-slide valve spring kit, (3)-oil filters, and this is in two years.
I have a York service Bulletin (SB0022) 1002, that seems to describe just what I am talking about . I haven't changed any of the parameters yet. I wanted to talk to someone that may have performed this repair before. I called York and they seem to blow off the service bulletin and asked if I had checked the the refrigerant charge. They said that the amount on the data plate (refrigerant Lbs) is the starting point and that I would have to remove or add refrigerant based on my sub cooling. These chillers have never been worked on before 2009. I had some leaks that were fixed and weighed in the charge. I pulled out about about 20lbs from each circuit to get my sub cooling @ 10Deg. fully loaded. That doesn't seem normal? Still had the same problem.
I have 3 other YCAS units, a 0130 and a 0330 that I have just weighed in the charge before and I was good to go.
During this condition "high ambient" the discharge pressure's are 310 to 350 and 0 sub cooling out of the condenser and about 25deg. out of the economizer. I logged it out as fast as I could so I could get water on the condensers to keep them on line. I don't have the log book in front of me at the moment. I did notice that as the ambient temp started to come down below 105deg. my sub cooling started to come back, and below 100deg I was back near normal 10deg.
These chillers have the low noise fan option and louvered cover panels option around entire unit. Not sure if that has much effect, but I hope someone may have been down this road might know. They are running one compressor on each chiller at about step30. but this site is expanding.
It's only Feb. Just 74deg. today, but I need to start looking into this before summer comes around. Unfortunately, I can't test it except on those rare days... Are these "YCAS" high ambient nightmares??