Coleman rooftop a/c
Does anyone have experience with the coleman mach rooftop ac units? I replaced Both units today with brand new ones. The zone 1 front a/c works as it should. The rear zone 2 unit does what the old one...
Forum Discussion
Bamshell wrote:
Thanks for all of the replies! Im leaning towards it being the tstat and here is why.. zone 2 is the back unit and if i switch to heat pump neither the compressor or the fan comes on. I am plugged into 50 amp ac now btw. If i go to cool, the fan comes on, no compressor. Also i just fired up my LP furnace and zone 1 seems to work perfect. When i try zone 2 on the gas heat it does nothing. I can tell there must be a separate fan for the rear zone because i have vents down low with no air flow coming out.. any feedback is greatly appreciated
At this point, you need to access your upper rear AC/HP control board. Check for loose or burnt wiring. You also need to check for 12 volts TO THE REAR FURNACE. The furnace is a separate appliance that is controlled thru the RVP tstat system. Did you replace the upper units or did a shop replace them? Either way, wiring may have been knocked loose when the upper control board was moved out of the way to replace the unit.
You can manually SWAP Zone 1 and Zone 2 at the front upper control board to test tstat operation for the rear HP. This link shows the ZC tstat wiring. Doug
https://www.airxcel.com/DesktopModules/RvProduct/Pdf/8330b331_8330b335_thermostat.pdf
