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  1. Some of you folks thankfully have been trying to help me troubleshoot why my 2015 rooftop Dometic Heat Pump (#651816). The units fan will start but shortly after trips the breaker. I have gone through several things to try and diagnose what is causing it. As they say a picture is worth a thousand words words so a video showing testing the compressor for short to ground, replacing the breaker and testing and replacing the start and run capacitors may give you a better understanding of what I have tried. The fan and compressor relays are mounted on the control board so I can't just pull them off and just replace. I appreciate any help I can get. I am not an HVAC tech, just a home owner with enough skills to be very, very dangerous that likes to fix his own stuff and doesn't give up easily. Thanks again for any help you can provide, Mike
  2. I have the Coleman Mach in the "possum belly" of my Spacecraft trailer. It's a little cool in North Florida this morning. I keep my inside temperatures maybe a little lower than most, but have learned I need to have the "Heat Pump" running some to decrease the inside humidity and decrease the condensation I have on some of the metal that extends from the outside of the trailer to the inside. I didn't consider the effects of where the HVAC unit was mounted during the build. I have learned in the past few years that it actually does make a significant difference on where it's mounted and where the supply and return runs are located. My supply to the center ceiling vents in the Spacecraft come up an exterior wall. There is a bit of insulation over the run, but I am not sure just how much. I do know if my trailer is facing North and South and the afternoon sun is striking the same side, my A/C runs a lot more than if I would turn the trailer around. It takes time to push out the hot air and start getting cool air. The reverse is true when it's cooler and may be more noticeable to some. Having the supply along an interior wall would be much better. The return going to the exterior would effect the efficiency much less I believe. The first room for the vent of the supply is in my bathroom. I can close the door and make it really cool or really warm, but it leaves the rest of the trailer with steadily increasing or decreasing temperatures at each end of the trailer. If it's really hot or cold I do close the vents in my garage space and close the door between the garage and living space. If I ever have to replace my HVAC unit I will request that change with the new instillation. These are my personal opinions and I have no science or actual build experience, what I think may work, may not be any better. Consider accordingly. Rod
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