Tuesday, June 7, 2011

Wiring up a thermostat to a fan

Question:
I have a Master Flow attic fan that I purchased at Home Depot to replace an older fan motor that stopped working. My problem is that when I wired the fan directly to the power source and it works fine.(black to black, white to white). Then I wired in the thermostat using the diagram provided and nothing happened. The thermostat has 2 black leads. I'm not sure which one goes to the black from the motor and which goes to the white. The diagram does not specify which either.  I then reversed the wires and it caused a spark but the circuit breaker didn't pop. Now the motor is not working even when I wire it directly. Did I damage the motor? How should it be wired?

Standard Fan Thermostat and switch


Answer:

The thermostatic doesn't attach to the white wires. It goes between the Black feed wire and the black from the fan. The thermostat cuts power from getting to the fan until a cretin temperature  is reached. At that point the switch closes and the fan receives power.

Comment:
Thank you so much...That makes all the difference which was not clear on the wiring diagram that came with the thermostat. A simple response like yours is much easier for the diy laymen to understand. Maybe you should start writing instructions for the big electronic companies. Their instruction pamphlets are a joke...Way too technical...why not just say motor black to tstat black-tstat black to source black. White directly to the source white.
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3 comments:

  1. i have a new style power vent that has a therostat and a humidostat.how would that wiring configuration work

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  3. The thermostat cuts power from getting to the fan until a cretin temperature is reached. At that point the switch closes and the fan receives power. Statistics Assignment Help

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