McQuay chiller tripping

[moideen]

:cool:hai
My McQuay chiller, model AGR 075, is showing alarm L.P.failure.I closed L.P.Switch and checked digital input on board. All correct. Although display shows L.P alarm! Can anyone please help me? Has anybody the wiring diagram of this same chiller?

[Grizzly]

:cool:hai
My McQuay chiller, model AGR 075, is showing alarm L.P.failure.I closed L.P.Switch and checked digital input on board. All correct. Although display shows L.P alarm! Can anyone please help me? Has anybody the wiring diagram of this same chiller?


Hi
Moideen I will email the IOM that I have, for that model.
You don't say whether you have "manually reset" the alarm function.
The chiller will not run on certain alarm conditions unless a "manual reset is carried out"
To do so you have to access the Controller (page 75 for McQuay Microtech)
If you have a Johnson Controls UNT Controller then that is covered in the manual also.

There are also wiring diagrams for the chiller with both controller types covered.

I hope this helps?
Grizzly http://www.refrigeration-engineer.com/forums/images/icons/icon14.gif