RTAA low evaporator temperature alarm

[rjdeville]

We have a re occurring fault driving us crazy! We've already replaced the sensor pair but cannot shake the low evaporator temp alarm. ANY IDEA???

[Healey Nut]

Call a pro !!!!!!!!!!

[Tech Rob]

The temperature of the evaporator is too low

[Healey Nut]

The temperature of the evaporator is too low

Shhhhhhh dont give them too many clues

[madhat]

Are you running Glycol in you CW loop? The Glycol has probably failed and Jelled. You'll need a Pro to recover the Glycol, clean up the system, and install new Glycol. I'm recommending you use a Dow Product, send the Glycol off to them every year for free testing. Repleanish the inhibitors per their instructions. If you pull a thermometer well you should be able to see the Jell. The Probe holder will wipe the probe clean when you pull it out, so you can't use that to judge. Also I'd have your service company check the probes, you could have a new defective one.

[jayguy]

my money is on low evaporator water flow.

[rjdeville]

Thanks jayguy and madhat ......no thanks to the smart @@$'s


We are looking at the slide valve with intense scrutiny!

[madhat]

When the Slide valve had a problem on our unit, we had a Start fault. BTW the unit will still shut down on temperature control, with a stuck slide. Just will try to start with to much load. Also it will be limited to one compressor. Have you looked at your Strainers ? They had a situation at a job were they were running both pumps and barely making flow, which didn't make any sense. They still had the construction strainers in them.

[Healey Nut]

[QUOTE=rjdeville;10319982]Thanks jayguy and madhat ......no thanks to the smart @@$'s




And with the "no thanks to the smart @@&'s "you still expect help ?????????????
How about getting your post count up apply for pro and then you may get some help , but with vague posts and stupid comments your not going to get very far on here . JMHO

[jayguy]

......no thanks to the smart @@$'s...

careful, careful, careful!

graham may sometimes be an ass, but his is smart...so maybe he IS a smart ass! hee hee! <-----------that is as close as i can get to a smart ass.

if you have a machine and you want free factory help (which is pretty top notch around here, regardless of the brand), then you need to just ignore those who may post what you don't want to hear...but don't shun them or bad mouth them...they have long memories.

and apologies can go very far.

i agree with madhat. you usually have starting (or not starting) diagnostics with slide valve problems...but it is possible that the slide valve is a problem. fixing a slide valve is fairly invasive compared to a lot of the other solutions....like verifying charge, flows and sensor accuracies, etc.

around here you need to give out a lot more information before any real diagnostics can be given...right now we are shooting in the dark. we need model number, serial number is helpful sometimes, all logged values (regardless of what they are), past work performed is nice, etc. i may be anywhere from 1 mile to 25,000 miles from you. as i get older, i find that i can't see the machine from that far away like i used to.

[joey94]

I never heard of a chiller with glycol getting jelled. what would cause this and what percent of glycol are you talking about?

[Healey Nut]

I never heard of a chiller with glycol getting jelled. what would cause this and what percent of glycol are you talking about?

Glycol doesnt freeze solid like water it just turns to a jello like consistency . the freeze point/concentration makes no difference it just has to get colder before it turns to jello.

Now if you want more info about pudding consistency Jayguy will happily help you out

[joey94]

we run our plant at 20% glycol and sometimes pull our chilled water down to 37 degrees, i was wondering if that could ever be an issue with us.