AC compressor reduction/replacement

shade

Well-known member
"In my application" is what I am talking about, see OP.
So, with a VFD, which are about $75 or so, it just goes inline with the alternating current power feed to the compressor motor? (no other AC components). Does this work, and who has done it? No harm to the compressor running slow or on less power? I guess instead of 120VAC it would be getting 80 or 90 or something? There is no chance to burn out the motor windings or anything? If it is just as simple as slowing down the compressor motor, then there are thousands of post on AC/generators in vane...
Good luck.
 

Verkstad

Raggarkung
VFD will only work if the appliance uses a 3 phase compressor motor.
Dunno if the A/C in question uses that motor, but 3Ø motors nowdays are in all manner of household appliances what have a variable speed or reverse function.
Said that.. Being a small HVAC compressor, I will be very suprised if not single phase.
"In my application" is what I am talking about, see OP.
So, with a VFD, which are about $75 or so, it just goes inline with the alternating current power feed to the compressor motor? (no other AC components). Does this work, and who has done it? No harm to the compressor running slow or on less power? I guess instead of 120VAC it would be getting 80 or 90 or something? There is no chance to burn out the motor windings or anything? If it is just as simple as slowing down the compressor motor, then there are thousands of post on AC/generators in vane...
 
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andytruck

Observer
I think they are all 3-phase, aren't they? If just one then a simple dimmer switch would work. When I added the soft start capacitor there were many wires like a 3-phase, more than just two to the motor... There was the capacitor, then another can that was a little smaller than the capacitor - I think one for the starting, and the other for continuos running.

I am doing a non-google search and not finding anyone who has tried this yet...
 

andytruck

Observer
I like the idea of the electronic device to cut the power lower, but I dont want to be the first RVer to try it.
Been trying to come up with a way to use a window unit without much mods. I keep coming back to the door, which is at the rear.
I would have to reinforce the door frame on the hinge side, but I think is doable with minimal complaints. Of course door will open only 90 degrees with this. Trailer won't hit like it could if AC on either side of door.
Unfortunately door is not replaceable as the Roamer is hard enough to find as it is and out of business, but it is fiberglass and infinitely repairable.
Cut hole in door, put in smallest AC unit, done.
Other option would be under the floor behind the end of the truck, there is just enough room, but way more complicated, dirty, ducting needed and ducting not efficient.
Other option, next to the door, custom face-divider, ducting, trailer would be close in sharp turns, but would only need 4 inch round holes for ducting.
I like the door solution.
Anyone tried AC unit in a door?
I would really need a better door latch, I have to slam it for it to close and latch, so slamming not a good things to do with an AC in door.
 

vintageracer

To Infinity and Beyond!
Air Conditioner that works at High Altitudes on very little power.

Can also double as a "Groover" when needed.

CHEAP TOO!


527255
 

andytruck

Observer
that doubles as a humidifier too. Now do I need to find a place for a deep freezer to make the ice?
You might be from the SW, but in the SE we call that "chrome", not duct tape.
 
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