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Montana has a rather narrow view on this. On our 3295RK there is ducting running beside the opening where the front A/C will be installed. It is pre-wired for the A/C except for the most important part. They didn't run a control wire from the front opening to the rear A/C. The way the thermostat works is, you must run a control wire from the board in the rear A/C to the board in the new front A/C and you must add a temperature sensor in the bedroom. This control wire is actually a flat 4 conductor phone cord. In order to get the polarity correct you nust cut the plug off one end of the phone cord and install a new one with the opposite polarity (flipped over) of the one you removed. The simplest way I could figure to do this was to use the A/C duct that ran beside the new front unit for a wire chase. In other words the wire was pulled from the rear unit to the front inside the duct. Then we went in the ceiling to a small hole we drilled in the toilet room next to the inside wall. The wire is run down the wall and then goes through the wall and the temperature sensor is mounted inside the bedroom. We covered the exposed wire in the toilet room with a piece of trim. The only way both A/C units will be ducted is if you ordered it out from the factory with 2 A/C units. I got a fellow I go to church with who operates an RV repair business to help with this install. I called the Montana dealer in Nasville, Tennessee where we bought our unit and talked with their shop foreman about this install. He said he had never heard of installing the front A/C that way but it sounded like a good odea. It would be better if Montana would simply put the control wire in the ceiling with both ends disconnected when they build the unit as part of the pre-wire package. It's strange that they use this thermostat which is capable of controlling 5 airhandling units and a generator if properly wired and then only wire it for one A/C.
Dave Nowlin
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