Just finished installing one of those Evergreen IM 'ECM conversion motors in my furnace (third motor in 8 years...yikes!). All seems well so far; it's at the right speed for heat & it slows to a really nice, super-low constant-speed that'll save a ton of money. I run the fan ALL the time...that kinda plays into the # of motor replacements!! But I don't know what'll happen when I need AC, as the my furnace board only has W, G and R low-voltage control terminals...no Y or Y1 (funny, there are spaces for them, and those spaces are both labeled 'Y', but there are no connectors there). Of course, Y is the call-control for A/C (the high/higher motor speed), so I don't know what to do to get a higher speed for when I use the AC? Of course, since this is an ECM motor (designed to replace PSC motors), the fact that my old motor had 3 high-voltage connectors going to 3 different speeds on the board (high voltage side) doens't mean anything. The speeds for this motor are ONLY controlled by the low-voltage [B]thermostat[/B] connections. W is working the furnace/low-speed, and that's really it, as you leave G unconnected to the motor , as that keeps the low, constant-speed, and I don't know what "R" does, as that's not referenced at all in the Evergreen manual. There are like 3 other low voltage speed-control wires coming off the motor (brown, orange and yellow), but I'm leaving them capped (you CAN connect them to the G connection, but that increases the speed for the fan-only setting, which I don't want to do). Do I want to use R as a replacement for Y (connect the high-speed motor-control wire to it)...what is R for? Or is this old/cheap furnace not really the best match for this motor, because it lacks low-voltage Y connections? In that case, do I need an external, motor-control unit that I can flip when changing from heat to cool? I guess I need two levels of expertise here; someone who knows Goodman control boards, and someone who's worked with these Evergreen ECM retrofit motors...hopefully it can be one person! Thank you!!

Hello. I am new here and would very much appreciate any feedback regarding my question. I have a 1200 square foot pole barn with about 15 foot ceilings at the peak. It has a framed room that is about 200 square feet (with 10 foot ceilings). I am hoping to turn the remaining 1000 sq feet into a woodworking shop, while using the 200 sq feet to store wood. I'd like to keep the 200 square foot room at a steady temperature year round (I am in Indiana), and heat the 1000 square foot workshop just while I am out working. I've looked at a PTAC for the 200 square foot room, then some type of space heater for the workshop, or maybe a mini split (single zone, or possible dual zone - one for the steady temp room and one for the larger space). But I don't know what the best option would be. Any thoughts and/or advice would be appreciated! Thanks, Jeff