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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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  • jack morton Mar 12, 2017

    Also, need to have your water loop checked out.

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  • Heating & Co... Expert
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To start with, the more I look at a system, the more familiar I become with that unit. Also, these machines can make me look like a genius or a fool! If you have a pressure switch problem, it's more than likely an expansion valve issue. I've seen a 2 month old Carrier, 4 compressors at 6 tons each, fail due to their expansion valve having an intermittent miss, closing for no reason, or not opening upon demand. And I spent 3 weeks chasing this because when it fails, all you can do is see the code, troubleshoot a bit, call Carrier tech support, then reset it. I ended up calling out Carrier, yes they have field techs, and it took 2 of them about 5 hrs to figure it out. These 2 only work on chillers, and took them 5 hrs! They adjusted the settings and walked away from it, said it was cycling on to close(each circuit), had damaged the valve. Still under warranty but did not replace. If its not the cooling fan circuit acting up, it may be the expansion valve(s) acting up. In that scenario, the tech is going to need to camp out by the unit, and catch it in the act. If you get a second opinion, call a refridgeration company that has some background in chillers. Or call Carrier.Hope this helps!

Posted on Mar 12, 2017

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