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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a Mcquay AGS340 Chiller. I get a constant low evaporator

Customer Question

I have a Mcquay AGS340 Chiller. I get a constant low evaporator pressure alarm and a no load alarm.y VFD controller for fans 1&2 is down and I am waiting for a new controller from Mcquay. Will this cause my alarms with these 2 fans down?Or do I have another problem?
Submitted: 2 years ago.
Category: HVAC
Expert:  Phil replied 2 years ago.
Welcome! We keep going until you have all of the information you need.[b/]. Extensive training & coaching also available.
It sounds like you have the manual but here it is again for reference in case we need it.
Tell me what you have observed, done or verified on all 16 of these items.
Note: low suction pressure can result in the chiller tubes freezing and causing catastrophic damage to the machine... If you are not heavily experienced with water chillers, now would be a very good time to call in a chiller expert, and shut the machine down in the meantime.
If you need help with that, tell me which direction you are from the center of the nearest city I will see who I can find.
The no load alarm could very well be caused by an already frozen chiller tube bundle, blocking water flow... that is a very critical situation, shut the chiller off until that is rectified. You could break the chiller tubes otherwise.
There is a lot more we can do, but we need to start there.