Roof Air Conditioner

[dale farley]

A roof air conditioner and heat pump that is controlled by a central thermostat. When air or heat is called for on this unit, the fan comes on as normal, but the compressor never tries to start. Is there anything other than a bad compressor that would cause this problem? I feel relatively sure it is not a thermostat problem.

[Fratto]

How about something like a start capacitor or overload of somekind internal to the unit?

[Gil_J]

A roof air conditioner and heat pump that is controlled by a central thermostat. When air or heat is called for on this unit, the fan comes on as normal, but the compressor never tries to start. Is there anything other than a bad compressor that would cause this problem? I feel relatively sure it is not a thermostat problem.

Relay pn the control card or capacitor.

[dale farley]

Thanks for the suggestions. I eventually found a wire that was not making good contact.

[Joe Camper]

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Please I need some help with making the correct connections on a second hand roof air I have put in my trailer. The fellow who removed it unfortunately did not leave some wire tail leaving a colored wire tail on the spades identified with that yellow strip. The thermostat it all came from the same rv it worked great should be plug and play but I need to plug it in correctly or that magic smoke will escape and it will die.

The thermostat does it require 12 v dc to function?

If so is the blue wire 12v ground that's what it looks like to me?

Thermo has heat mode that's not applicable here is there a wire for it u leave unhooked?

4 of those wires coming off the thermostat connect to those 4 spades.

What is GH and GL?

Y is yellow??

B is blue?

What of the remaining 2?

How do I where what??? Please help me.

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[Fratto]

I believe that coleman is using the following:

red is 12 volt
blue is common
green is high speed fan
gray is low speed fan
yellow is call for cooling
white is call for heat

[Fratto]

red is 12 volt
blue is common
green (GH) is high speed fan
gray (GL) is low speed fan
yellow is call for cooling or compressor
white is for a furnace

Yes, it needs 12 VDC to function
Yes, the blue is ground
Yes, leave the white wire for the furnace disconnected.

[Joe Camper]

Ok

Red to 12V.

Yellow to Y

Green to GH

Grey to GL

Blue to B

White remains unhooked.

Correct?

[Fratto]

That’s what I would do

[Joe Camper]

Thanks a million Mark I'm going to hook it up today.