High Pressure Switch Trip - Carrier Commercial Chiller Unit


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Old 06-14-10, 04:40 PM
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High Pressure Switch Trip - Carrier Commercial Chiller Unit

I have a Carrier HFC-134a commercial chiller unit, model 30HXA076RY-561AA. It runs 2 sides, which are labeled A1 and A2. Over the past few weeks now, the A1 side keeps shutting down (almost daily, sometimes more often) with an alarm that says "A1 Failure - High Pressure Switch Trip".

We've had a local HVAC company come in to look at it a few times... one of them they were here for nearly 2 full days. They replaced some filters and did some diagnostics... racking up a huge bill... but haven't solved the problem. It seems to me they either don't know what they're doing or they're trying to nickel and dime our company.

If anyone can give me any suggestions it would be much appreciated. To me, it seems like it would obviously be the pressure sensor in the A1 side as the actual pressure is dead on, but I'm not experienced enough with this sort of thing to know for sure. Thanks ahead of time!
 
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Old 06-14-10, 05:23 PM
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What you appear to have is a 75 ton chiller with an outdoor air cooled condenser running dual screw compressors.

It would be difficult to say what exactly the problem is without actually looking at it.
It could very well be that the problem is difficult to track down but they could also not know what they are doing.


This is a fairly large and costly unit and I would suggest you want the best people looking at it.
I have dealt with Carrier quite a bit and find that they are concerned when less that qualified or experienced people look at their equipment as it makes them look bad.

Contact your local sales office and tell them what you are telling us and they will advise you on who is authorized and qualified to work on this equipment.
 
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Old 06-14-10, 06:19 PM
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That does look like the unit. Thanks Greg, I will contact Carrier.
 
 

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