RV.Net Open Roads Forum: Travel Trailers: AC unit wiring question

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Travel Trailers

Open Roads Forum  >  Travel Trailers  >  General Q&A

 > AC unit wiring question

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Sponsored By:
gordinho80

Central NJ

New Member

Joined: 11/17/2017

View Profile


Offline
Posted: 06/23/20 12:08pm Link  |  Quote  |  Print  |  Notify Moderator

My travel trailer build has been very slow going. 2 years ago I removed the AC unit from the roof in order to replace the roof completely. I can't seem to find the pictures I took of the wiring prior to removal... [emoticon]

So here I am now trying to figure out what wire goes to what...

AC unit has 11 wires...

RED - TAN - YEL - WHI - BLU - ORN - BLK - GRN - RED/WHT - BLU/WHT - BLU/WHT

There are 2 thin guage wire sets that run into the trailer... One has 2 wires, RED - WHT. The other has 6, RED - YEL - WHT - BLU - TAN - GRN .

The thermostat has the same 6 wires connected to it.

Trying to figure out what wire from the AC unit goes to what on the thermostat side...

[image]

[image]

[image]

There is also 110 wiring... from the AC itself, there is your standard WHT - BLK - Ground. There is a WHT and a BRN wire that is ran through the same port as the 2 thin sets. Plus a 110v box with WHT - BLK - Ground


Mario
2012 Ram 1500 Crew Big Horn 5.7L Hemi (My first Dodge)
2000 Coachmen Futura 2790TB (Our first camper) - https://www.instagram.com/martin_the_camper/

theoldwizard1

SE MI

Senior Member

Joined: 09/07/2010

View Profile


Offline
Posted: 06/23/20 07:00pm Link  |  Quote  |  Print  |  Notify Moderator

Is there another circuit board ? The drawing show the wires from the thermostat going to CON1 (6 pin, rectangle) and CON2 (4 pin square).

The only brown wire I see goes from the Fan half of the Run Capacitor to the Fan. White connects to the center terminal of the Run Capacitor and many other things (it is the 120VAC neutral).

gordinho80

Central NJ

New Member

Joined: 11/17/2017

View Profile


Offline
Posted: 06/24/20 07:45am Link  |  Quote  |  Print  |  Notify Moderator

No other board. I really wish I could find the picture of the wiring before I removed the unit. Perhaps I did not take one... [emoticon]

I'll try to get a picture of all the wires as they are.

opnspaces

San Diego Ca

Senior Member

Joined: 12/22/2004

View Profile


Offline
Posted: 06/24/20 10:19am Link  |  Quote  |  Print  |  Notify Moderator

In the circuit board picture are there any labels on the board above the blue 6 pin connector?


2001 Suburban 4x4. 6.0L, 4.10 3/4 ton
2005 Jayco Jay Flight 27BH
1986 Coleman Columbia Popup.

gordinho80

Central NJ

New Member

Joined: 11/17/2017

View Profile


Offline
Posted: 06/25/20 02:31pm Link  |  Quote  |  Print  |  Notify Moderator

[image]

Wiring coming from the AC unit itself...

the 11 that I mentioned prior, the first pic in the first post shows the label of these 11 wires. Then there are 110v black, white, and ground...

[image]

Here you see the 110v wiring coming from the trailer breaker box...

[image]

ANother grouping of wires coming from trailer. The 2 sets of thin wires including the one going to thermostat.

[image]

There is also a thicker brown and white which I believe connects to the breaker box here:

[image]

wnjj

Cornelius, Oregon

Senior Member

Joined: 01/11/2007

View Profile


Offline
Posted: 06/25/20 04:02pm Link  |  Quote  |  Print  |  Notify Moderator

The 2-wire thin pair (red/white) likely comes from the furnace. Usually power comes up the red wire and is switched on/off on the white wire by the thermostat. That white wire needs to connect to the white one coming from the thermostat 'heat' pin (also white). The red wire may also need connected to the thermostat + wire (red).

Some of the wires in the 6-wire cable look like they were cut and/or never used. I assume some of those broke off when you disconnected them?

The A/C will need a wire for cool, fan, high fan, power and ground. The brown and white larger wires probably provide the 12V power for the A/C unit.

What brand is the A/C?

gordinho80

Central NJ

New Member

Joined: 11/17/2017

View Profile


Offline
Posted: 06/25/20 04:09pm Link  |  Quote  |  Print  |  Notify Moderator

Its a Dometic, not sure the model.

wnjj

Cornelius, Oregon

Senior Member

Joined: 01/11/2007

View Profile


Offline
Posted: 06/25/20 05:06pm Link  |  Quote  |  Print  |  Notify Moderator

OK, so I found a Dometic installation instruction that while it may not be your model, the wiring colors are the same.

https://www.manualslib.com/manual/808076/Dometic-620412-331.html?page=13#manual

For the following, I'll refer to the separate brown & white as the supply wires, the red & white pair as the furnace wires and the 6-conductor as the thermostat wires. The wire colors in all CAPS will be the 11 A/C wires.

According to the doc above:

1. Connect large the +12V brown supply wire to A/C RED (after you confirm it's the one from your fusebox).
2. Connect the large white supply wire to A/C BLACK.
3. Connect the thermostat red wire to A/C RED/WHITE (+12V out to thermostat).
4. Connect the thermostat green to A/C GREEN (gnd).
5. Connect the thermostat yellow to A/C YELLOW (cool).
6. Connect the thermostat tan to A/C TAN (fan).
7. Connect the thermostat blue to A/C BLUE (hi fan).
8. Connect the thermostat white to A/C WHITE (heat).
9. A/C ORANGE is not used (no HS/HP terminal on your thermostat).

I take back what I said previously about the furnace wires (red & white pair). It seems this A/C unit takes in the thermostat white wire and provides a set of BLUE/WHITE that short together to run the furnace. Based upon that, I'd say the 2-wire red & white furnace pair connect to the A/C BLUE/WHITE wires.

wnjj

Cornelius, Oregon

Senior Member

Joined: 01/11/2007

View Profile


Offline
Posted: 06/29/20 09:46am Link  |  Quote  |  Print  |  Notify Moderator

Did you ever get a chance to connect it up? I’m curious if it’s working.

gordinho80

Central NJ

New Member

Joined: 11/17/2017

View Profile


Offline
Posted: 06/30/20 08:17am Link  |  Quote  |  Print  |  Notify Moderator

wnjj wrote:

Did you ever get a chance to connect it up? I’m curious if it’s working.


Just wired it up yesterday. Thanks so much! Everything working as should be... well, I assume. I haven't tried it on HEAT yet as I don't have the furnace all hooked up and no propane currently.

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 

Open Roads Forum  >  Travel Trailers  >  General Q&A

 > AC unit wiring question
Search:   Advanced Search

Search only in Travel Trailers


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2020 CWI, Inc. © 2020 Good Sam Enterprises, LLC. All Rights Reserved.