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.

[Fratto]

I have my fingers crossed that the smoke stays inside!

[Joe Camper]

So GH, GL. H designates high speed and L is low speed? What does G signify?

Is there any ryme or reason to the weird color choices?


And that's right all electrical things opoorate off of magic smoke they all have inside. When the magic smoke is allowed to escape the stuff don't work without it. Ever again in most cases.

[Fratto]

In Coleman’s world, G stands for green and gray