Are the alarms happening close to the same time?
Any one have any info in nuisance t114 & t115 alerts ?
Check machine out and cannot form a concrete conclusion.
I didn't know if any bulletins exist that may end my search.
All transducers thermisters flow approach charge exv check ok per manual....
Are the alarms happening close to the same time?
Yes ...
I do have a couple more t-115 but have had three 114&115 happen on the same day.
I did notice today that from a startup circuit B did pretty good but the longer it ran the worse it got . I would end up with 3 degrees superheat ,my EXV at 8% (which is minimum ) and a cloudy sight glass.
Subcool was within 5 degrees of normal ,running low actually ,
Approach was around 7
ewt 51
lwt 48
Sat suc 41
return gas 44
exv at 8%
sat con 110...
I verified the transducers and thermisters......
I ran all the exv tests in the manual.
I ran the exc to 0% ,killed power,unhooked it ,ran B in test ,pumped down and held.
I have had about 8 t-115 and about 3 t114 lockouts in the last month .
Then after unhooking my test equipment i restarted it and B ran for a half and hour with normal superheat and the valve at 50% +-5%....
Its like the valve doesn't move at times and / or the control looses track of it....(.did i say that right)
didn't really catch A doing much of anything odd today....
Is that both compressors running on circuit B?
Waterside is all good and the strainer was clean?
Flow is good?
This an industrial process?
Software version?
Those conditions are with one compressor.
It actually does better when the second one comes on, then returns to above state after it cycles off. The second compressor cycles on and off as load increases/ decreases and is on for about 20 min and off for 45 min or better . The load appeared to be pretty constant today.
Cannot take a pressure drop today as zero taps are in place anywhere in the piping.
Did not check the strainer yet ,when I had the machine at 70% my td was seven and so was my approach on both circuits. Could not shut it down as its for process, will need to find a down day to do so.
This chiller feeds a tank with a secondary loop off of the tank ,there are no valves to modulate in the piping. I am gonna guess and say we have at least 300 + gallons of 35% dowfrost/ water in the loop.
This is for process.
I do not know my software version.
That will happen the middle of next week ,,,have a good weekend....
I had one doing that same thing one time. It turned out to be a control problem, and I
had to download a newer version of sortware. How old is the chiller? I would also get the level of glycol down to 30%.
Next week we are going to verify the waterside and proceed from there....
6PSIG DROP = 160GPM
Strainer clean.....
To the top...
You know I keep looking at this situation you have here and the only weird thing I see is your approach. That would be good for a flooded evaporator but we have a DX evaporator.
Could your BPHE be fouled with excess oil?
I don't deal with PG too much but you have the flow could the mixture be too high like chilbrig eluded to?
I don't believe so....
I currently have propy glycol at 35%
My earliest of posts stated dowtherm and it read high ,as in 40+%, but i was assured by the plant engineer that all they use is dowdrost.
Monday ,when another tech was there ,we discussed everything that had been checked and the valves never got below 40% with the pretty much same conditions and load ....
i was 20 degrees warmer outside ...
What would YOU expect the approach to be ? Not a trick question , just curious..
I assume your saying you would expect the approach to be 2-4 not 7-9 ?
update... Chiller is fixed....main base board issue .... Replaces main base board everything is ok....carrier engineer admitted to some flaky boards being out there
Sounds like a good explanation to me I guess.