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| Joined: | Sun Dec 17th, 2006 |
| Location: | Atlanta, Georgia USA |
| Posts: | 193 |
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What is the return air, what is the supply air, whats the ambient temp?
Is the condensor fan(s) running, if so is it in the right direction with the blades correctly faced up. Is it on a fan cycling switch, are the coils clean inside and out.
Do you have a restriction in the lines, kinked copper, bad filter drier. Are you simply grossly over charged with refrigerant?
You may have to recover enough refrigerant to get the thing to run long enough to watch it, get your super heat and/or sub cool.
Just start with the basics. The big machine is just like the little ones - just with a little more "Wow!" factor. It all is the same principle albeit RTU split, one stage/multi stage.
As to the relays you may have some fire alarm shut down system, some building automation system. Again the basics...where do the contacts go, are they NO or NC, are they passing HV or LV? What is feeding the coils HV or LV, where is the feed coming from.
Grab a diagram and start cutting wire ties and start following wires by hand if necessary.
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