HVAC: Why two wires going to the fan?

- S
- Sam Takoy
  
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posted
12 years ago

Tue, May 31, 2011 3:57 AM

Hi,

In my thermostat there is a slot marked "Fan" and there are two wires in that slot. How come? Why would a fan need two signals?

Thanks!

Sam

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- T
- Tony Hwang
  
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posted
12 years ago

Tue, May 31, 2011 5:04 AM

Hmmm, TYou did not mention 'stat model/

- F
- Fat-Dumb and Happy
  
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posted
12 years ago

Tue, May 31, 2011 7:16 AM

formatting link

- S
- Steve B
  
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posted
12 years ago

Tue, May 31, 2011 3:25 PM

One is for when the unit is used in the northern hemisphere, and the other for the southern hemisphere. DO NOT connect both at any time, or there may be an antimatter explosion!

Steve

- M
- mkirsch1
  
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posted
12 years ago

Tue, May 31, 2011 3:30 PM

Um, maybe there are two fans, or there's something else that needs to come on when the fan comes on?

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