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  • Coleman Mach 15 ac wiring question

    I’ve got unit installed into front bedroom. It was pre wired. Anyone that’s installed this unit, can you tell me how to connect the 12v portion? Does it somehow connect to the pins on the control board. I think I get everything else, but not the 12v. Manual is not helping me, and YouTube has failed me this time. Here’s two pics of what I have.
    Steve, Sue, and pups Sky & Sierra
    2017 Grand Design Reflection 297RSTS
    2017 F350 CC, LB, 4x4, 6.7 Blue Ox WD

  • #2
    Originally posted by Steve7 View Post
    I’ve got unit installed into front bedroom. It was pre wired. Anyone that’s installed this unit, can you tell me how to connect the 12v portion? Does it somehow connect to the pins on the control board. I think I get everything else, but not the 12v. Manual is not helping me, and YouTube has failed me this time. Here’s two pics of what I have.
    Steve,
    This was at https://wiringall.com/airxcel-thermo...g-diagram.html

    Click image for larger version

Name:	No idea.JPG
Views:	6489
Size:	95.4 KB
ID:	23326

    No idea if it is accurate or applicable to your unit, though...
    Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.

    2017 Ford F-350 DRW, '19 315RLTSPlus

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    • #3
      Originally posted by Steve7 View Post
      I’ve got unit installed into front bedroom. It was pre wired. Anyone that’s installed this unit, can you tell me how to connect the 12v portion? Does it somehow connect to the pins on the control board. I think I get everything else, but not the 12v. Manual is not helping me, and YouTube has failed me this time. Here’s two pics of what I have.
      Its been a little while since I did mine, but I think the 12v connection was only at the thermostat as howson shows. I think all of the ceiling connections were 120V. You will need to splice the 12v "lamp cord" in the ceiling with the appropriate wire in the bundle going to the thermostat.
      Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.

      Neil Citro
      2018 Reflection 28BH Pepwave
      2019 F350 6.7L Long Bed Crew Cab

      Comment


      • #4
        Thanks for the tips guys. I’ve got it running, but I have no control over it through the thermostat. I can change mode a bit, but can’t turn it off. Any suggestions?
        Steve, Sue, and pups Sky & Sierra
        2017 Grand Design Reflection 297RSTS
        2017 F350 CC, LB, 4x4, 6.7 Blue Ox WD

        Comment


        • #5
          Originally posted by ncitro View Post

          Its been a little while since I did mine, but I think the 12v connection was only at the thermostat as howson shows. I think all of the ceiling connections were 120V. You will need to splice the 12v "lamp cord" in the ceiling with the appropriate wire in the bundle going to the thermostat.
          Thanks! See below
          Steve, Sue, and pups Sky & Sierra
          2017 Grand Design Reflection 297RSTS
          2017 F350 CC, LB, 4x4, 6.7 Blue Ox WD

          Comment


          • #6
            Originally posted by howson View Post

            Steve,
            This was at https://wiringall.com/airxcel-thermo...g-diagram.html

            Click image for larger version

Name:	No idea.JPG
Views:	6489
Size:	95.4 KB
ID:	23326

            No idea if it is accurate or applicable to your unit, though...
            Thanks Howson! Hit it running but can’t control via t stat. Have to turn off via circuit breaker.
            Steve, Sue, and pups Sky & Sierra
            2017 Grand Design Reflection 297RSTS
            2017 F350 CC, LB, 4x4, 6.7 Blue Ox WD

            Comment


            • #7
              Originally posted by Steve7 View Post

              Thanks Howson! Hit it running but can’t control via t stat. Have to turn off via circuit breaker.
              Which thermostat do you have?
              Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.

              Neil Citro
              2018 Reflection 28BH Pepwave
              2019 F350 6.7L Long Bed Crew Cab

              Comment


              • #8
                Originally posted by ncitro View Post

                Its been a little while since I did mine, but I think the 12v connection was only at the thermostat as howson shows. I think all of the ceiling connections were 120V. You will need to splice the 12v "lamp cord" in the ceiling with the appropriate wire in the bundle going to the thermostat.
                I had drawn mine up like this. Does it look right besides colors?
                Coleman-AirXcel HVAC.pdf
                Gene and Kim
                2015 Grand Design Reflection 317RST
                2017 RAM 3500 CC, LB, 4x2, 6.7L CTD

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                • #9
                  Originally posted by gbkims View Post

                  I had drawn mine up like this. Does it look right besides colors?
                  [ATTACH]n23350[/ATTACH]
                  Yes that looks correct. Okay so if you take the +12v wire off the thermostat, with the breaker on, nothing should run, and the thermostat should show nothing. Then you should be able to touch the +12v wire to low or high fan and they should come on. If that all works properly, but connected to the thermostat it runs all the time, you’ve got a problem in the thermostat. Off with the +12v wire off the thermostat, the unit still runs all the time you’ve got either a wiring problem or a control unit issue.
                  Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.

                  Neil Citro
                  2018 Reflection 28BH Pepwave
                  2019 F350 6.7L Long Bed Crew Cab

                  Comment


                  • #10
                    Originally posted by ncitro View Post

                    Which thermostat do you have?
                    I have the AirXCEL digital. 9430 series. It is for cool and heat, but I don’t have the heat option in the ac. I was told to not use the heater wires. Here pics of the diagrams and how I hooked it up. I used the brown wire as the grey. I’m not sure I hooked up the wires to the correct pins on the rear of the thermostat.
                    Steve, Sue, and pups Sky & Sierra
                    2017 Grand Design Reflection 297RSTS
                    2017 F350 CC, LB, 4x4, 6.7 Blue Ox WD

                    Comment


                    • #11
                      Okay, with some help from another owner, I figured I screwed up. I had all the 12v+ wired together and connected to the control box. I corrected that by removing it from the control box. All works except the high modes. I’ll have to work on that another time. The trailer is cooling down quickly. Thanks.
                      Steve, Sue, and pups Sky & Sierra
                      2017 Grand Design Reflection 297RSTS
                      2017 F350 CC, LB, 4x4, 6.7 Blue Ox WD

                      Comment


                      • #12
                        Did some checking of low voltage wires today using multi meter. After plugging the high and low fan wires back in, everything began working properly. All is good!🤔
                        Steve, Sue, and pups Sky & Sierra
                        2017 Grand Design Reflection 297RSTS
                        2017 F350 CC, LB, 4x4, 6.7 Blue Ox WD

                        Comment

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