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...
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!
Mar 12, 2017 |
Heating & Cooling