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07-18-2011, 01:50 PM
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#1
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Registered User
1998 34' Excella 1000
1995 36' Classic 36
Spencerville
, Maryland
Join Date: Aug 2009
Posts: 257
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Doh, Only two wires but the fan runs backwards!
I have a simple toggle switch which was wired in to the back bedroom to run two 12v fans and I just cannot get them to push air out rather than suck it in.... yes, I've switched the wires to the other switch post but there is not change. Now, I'm usually ok with wiring but this is SO simple I can't figure it out. Any comments (good or bad) will be accepted and taken with good humor.
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07-18-2011, 01:53 PM
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#2
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Maniacal Engineer
1971 25' Tradewind
Lopez Island
, Washington
Join Date: Jan 2010
Posts: 1,244
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Permanent magnet motors will reverse if polarity is reversed (exchange wires going into motor). If the fans are computer type, they're brushless DC motors and cannot generally be reversed unless designed for that.
- Bart
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07-18-2011, 01:55 PM
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#3
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Registered User
1998 34' Excella 1000
1995 36' Classic 36
Spencerville
, Maryland
Join Date: Aug 2009
Posts: 257
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So what you are saying is that, regardless of what I do now, those fans are always going to run backwards?
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07-18-2011, 01:58 PM
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#4
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Rivet Master 
Elkhart
, Indiana
Join Date: Mar 2008
Posts: 633
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Can you turn the fans around?
__________________
Mike
Have a great day!
TAC # IN 1 Air#27922
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07-18-2011, 02:25 PM
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#5
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Registered User
1998 34' Excella 1000
1995 36' Classic 36
Spencerville
, Maryland
Join Date: Aug 2009
Posts: 257
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Cheap $20 fans
Quote:
Originally Posted by barts
Permanent magnet motors will reverse if polarity is reversed (exchange wires going into motor). If the fans are computer type, they're brushless DC motors and cannot generally be reversed unless designed for that.
- Bart
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Bart, they're cheap plastic fans. Any suggestions or did you basically state that they're somehow reversed forever.....
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07-18-2011, 02:29 PM
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#6
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Rivet Master
1998 31' Excella 1000
1979 23' Safari
Mooresville
, Indiana
Join Date: Aug 2007
Posts: 598
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07-18-2011, 02:57 PM
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#7
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Rivet Master
1973 27' Overlander
Currently Looking...
Jupiter
, Florida
Join Date: Apr 2006
Posts: 2,061
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If you have a standard automotive type install the motors are grounded as the return to the battery - so flipping the wires on the motor itself might work... If they are muffin fans, it will have rotation and airflow directions indicated usually by universal language symbols... ←↓ or →↑ etc. (nearly invisible) cast into the plastic housings.
__________________
The days are short and the night is long and the stars go tumbling by.. . ~Airstream~
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07-18-2011, 03:05 PM
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#8
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one of those
2011 27 FB International
'03 F250 PSD
, Airstream summers, Catalac winters
Join Date: Apr 2011
Posts: 1,091
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you need to return those fans and get some set up for the northern hemispshere. Somewhere in South Africa or Brazil there is a guy with the same complaint....
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07-18-2011, 04:12 PM
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#9
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Maniacal Engineer
1971 25' Tradewind
Lopez Island
, Washington
Join Date: Jan 2010
Posts: 1,244
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Quote:
Originally Posted by GREENovaters
So what you are saying is that, regardless of what I do now, those fans are always going to run backwards?
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What kind of fans are these (a picture would help here)?
- Bart
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