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BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22109
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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We have a McQuay PEH079 Chiller at work. The processor LED

Customer Question

We have a McQuay PEH079 Chiller at work. The green processor LED will not light up. The display works but does not respond to start up request or any other requests. The problem developed last year and by switching off the main disconnect switch off & on a few times I could get the processor LED to light up and the Chiller would start. We had the disconnect switch replaced but this year no green light and the Chiller will not start at request. The Micro tech Panel is getting 30 volts but when I checked the two LM7805 voltage regulators on that panel grd to input and output they are 0 volts. Some component on that panel is open. Any ideas?
Submitted: 6 months ago.
Category: HVAC
Expert:  BillyHvac replied 6 months ago.

I am very sorry your question has not been picked up yet.

I just logged on and found you had not been assisted.

Please let me know if you still need help and I will do my best. Please do not "Rate" as we have not worked toward an answer yet.

If you would like to proceed let me know by replying

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