How do you NOT an AC circuit?

Question

Someone help!I have what appears to be a simple problem, but i can't find a solutionanywhere.Using a 120V AC switch, how do you NOT the output. When the switch isopen, the output is on and when the switch is closed the output wouldbe off.The problem...I have a closet full of computer equipment and i can'tclose the door or the machines will over heat.  so i installed abathroom ceiling fan, that vents the closet, but its always on. So iwant to add a thermostat to it.  A cheap 120V AC baseboard heaterthermostat is perfect except it completes the circuit when the room iscold not hot.The applied use of this solution would be to NOT the output of aregular 120V AC baseboard heater thermostat to a common 120V ACbathroom exhaust fan.A relay should be used? Or is there a baseboard heater controller thathas reverse outputs?Signed...I want to close my closet!!

sQuick · Accepted Answer

Get a cooling thermostat not a heating one.sQuick..

Charles Perry · Answer

Dang.  I was going to suggest that!Buy one for an attic vent fan.Charles Perry P.E.

Robbie Mayhem · Answer

You could always wire it through a normally closed relay contact and connect the relay coil to the switch i.e. switch open, contacts closed and vise versa.Rob

electrician · Answer

AgarGuest · Answer

great tips.Would this be just a good as the Honeywell? its only $19.00

AgarGuest · Answer

great tips.Would this be just a good as the Honeywell? its only $19.00

electrician · Answer

For the last several years I worked for a major West Coast ControlContractor.  We used lots of honeywell thermostats for industrial andcommercial jobs.  I do not recall using Broan.  We had good luck withHoneywell.  Of course, I just installed them, I did not design thesystems.

Bud-- · Answer

Broan gives a rating of 120, 250, 277 VAC; 22 Amp capacity It would be nice to have a HP rating. It should be OK at 11 Amps for a motor, which is around 1/2 HP, which is probably larger than you are using.

bud--

newsman · Answer

You don't say don't say where you installed the ceiling fan.  If it's really in the ceiling, you should be aware that it may be a code violation to vent directly into that attic space, and you may need a roof vent.  This is certainly true for bathrooms and range hoods.  A closet?  I dunno.  You could claim its like a whole house fan and maybe get away with it.  You should also check that the air entry space to the closet(usually under the door) has enough area to accomodate the air flow.AgarGuest wrote:

How do you NOT an AC circuit?

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