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durtieduck
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Join Date: Jan 2011
Posts: 668
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Reversed A.C.

08/24/2012 8:39 PM

i had a tech work on my ac a few months ago. i just recently used it for the first time. the fans are running backwards. i'm guessing the compressor is too. he put a hard start condensor on it and by passed the other caps and a starters.

i called them and raise hell, but they still wanted to charge me for another service call, so i told him to go f### himself.

i don't have my ac gauges anymore.

can anyone give me some good, practical advice how to fix it?

it's a coleman mach 2 camper unit. 110v 13,500 btu

please, NO SAFTY ADVICE.
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SolarEagle
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#1

Re: revered a.c.

08/24/2012 10:57 PM

OK But I'll have to charge you ....

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Tornado
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#2

Re: revered a.c.

08/24/2012 11:05 PM

Drop it off a tall building.

The fans may have a wiring diagram in the junction boxes that shows how to wire them for the opposite direction. Depending on the type of oil pump in the compressor, it might operate fine in either direction.

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SolarEagle
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#3

Re: revered a.c.

08/24/2012 11:21 PM
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SolarEagle
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#4
In reply to #3

Re: revered a.c.

08/24/2012 11:34 PM

Some motors have reversible rotation....If it does, it will have two loops of wire , possibly with spade connectors as pictured, that can be switched....

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Gavilan
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#5

Re: revered a.c.

08/25/2012 12:31 AM

Ahhhh - any chance the fan blade is on backwards?

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Tornado
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#6
In reply to #5

Re: revered a.c.

08/25/2012 12:36 AM

It would still blow air in the same direction, only with different efficiency.

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lyn
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#7

Re: revered a.c.

08/25/2012 10:03 AM

I quit using Fly-by-Night Industries a long time ago.

I also learned, long ago, not to piss off the service tech by telling him how to do his job.

Sounds like you were just too helpful, to me.

" by passed the other caps and a starters" sounds like jury-rigging to me. You get what you pay for.

Have a pro come out and reverse your wires. Don't help him!
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durtieduck
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#10
In reply to #7

Re: revered a.c.

08/25/2012 3:03 PM

they're the best that we've got in my area. i'm thinking they must hear the word ###hole alot.
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lyn
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#11
In reply to #10

Re: revered a.c.

08/25/2012 3:26 PM

Too bad. I guess you've tried reversing the wiring?
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durtieduck
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#12
In reply to #11

Re: revered a.c.

08/25/2012 6:58 PM

just on the quick starter cap, lynn. no luck
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waldig
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#8

Re: revered a.c.

08/25/2012 10:29 AM

There are several possibilities here. The fan motor could have reversible connections to change the rotation.....but unless it was replaced, most factory motors are fixed in their rotation direction, its cheaper that way.

The other issue is that the compressor and fan motor typically have a common capacitor with a section for HERM ( the compressor ) and FAN for the fan motor. Please remove the power and check the color of the leads going to the capacitors against the schematic to be sure they are in the correct position. FAN capacitor leads are typically color coded brown in the HVAC community.

Another possibility is that the capacitor could be weak or open, allowing the motor to run backwards, residential units do this frequently. A new run cap typically fixes this problem, we have replaced over a 100 caps this summer that tested less-below 90 % of the nameplate ratings.

IF the unit has a common run cap, we have observed that bad caps will ROCK back and forth when set on a flat surface as their bottom is bulged out like a can of food that has gone bad and started to swell. This is because the caps, when they fail often puff up by design to pull the internal leads loose from the top terminals, limiting further failure in the A/C unit. At this point the fan has no sense of direction and can run backwards, usually at lower speed.

enjoy, Woody

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metalSmiths
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#9

Re: revered a.c.

08/25/2012 11:26 AM

If you know the Model number (should be with the owners manual.) Most of the camper ac units are online. The biggest thing is there are variations from one model to the next in the same series (Coleman Mach II).

Here the website for coleman-mach Airxcel Rv products. get the series/model number go to tech lit section. You should be able to find all the manuals service/owner/installation for your unit and service guides also.

Oh here another link RV TECH Library. though some of it links to the above site. there may be other info to help you.

Never let anyone modify the equipment from the way it was designed. If there is a problem find it, fix it correctly.

*******+++++*******

FYI IMPORTANT DO A GOOGLE SEARCH OR CONTACT THE MANF. ON YOUR RV REFRIGERATOR A LARGE NUMBER OF THEM FROM SEVERAL MANF. HAVE RECALLS FOR FIRE HAZARDS. (model and serial number is whats needed located on the inside.) They go back for years. If yours has NOT been upgraded with the proper shields your at RISK. Even if it has been replace with a different one that what WAS ORIGINAL get it checked. The recall service should be covered in full by the manf. just contact them.

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durtieduck
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#13

Re: Reversed A.C.

08/25/2012 7:04 PM

i wish i knew how to send a pic of the wiring after he "fixed" it. it's the crudest job i've ever seen. it's laughable.
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durtieduck
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#14

Re: Reversed A.C.

08/25/2012 7:25 PM

i founld more info on the unit. i'm hoping someone can help me find a service manual that includes a wiring diagram. ac- circa- 1973

md.#-6259A807

herm- 115v/ 13.3 amps/ -

fan-2.7 amps

full locked rotor-76 amps

full locked fan- 6 amp
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bigg
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#15
In reply to #14

Re: Reversed A.C.

08/26/2012 5:48 PM

Is this the same AC you were inquiring about back in April?

http://cr4.globalspec.com/thread/77308

If so, I guess the answer is 'Yes, it is possible to reverse the motor on a 110v unit.' Now you're complaining?
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PWSlack
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#16

Re: Reversed A.C.

08/28/2012 4:23 AM

Simple. Don't pay the bill until the firm comes out and fixes the problem.

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Users who posted comments:

bigg (1); durtieduck (4); Gavilan (1); lyn (2); metalSmiths (1); PWSlack (1); SolarEagle (3); Tornado (2); waldig (1)

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