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Temp Fall Line Voltage T-Stat

719 Views 3 Replies 3 Participants Last post by  bubba3228, 
B
Hello All - First post here. I have not had the experience wiring a line voltage stat for an exhaust fan before and would like to ask the question here I am not sure about.
The Exhaust fan is for a greenhouse and it has a "heat" terminal and a "cool" terminal, also a "P" terminal.
The wiring diagram I have looked at shows L1 going directly to one leg of the fan and L2 going to "P" and the load side "cool" term.
My question is, can the 120v L1 sit on the motor with out harming the coil with what to me would be a low voltage condition to the motor.
This is a 240v fan (I have not seen it to know if it a single or two speed)
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backstay
bubba3228 said:
Hello All - First post here. I have not had the experience wiring a line voltage stat for an exhaust fan before and would like to ask the question here I am not sure about. The Exhaust fan is for a greenhouse and it has a "heat" terminal and a "cool" terminal, also a "P" terminal. The wiring diagram I have looked at shows L1 going directly to one leg of the fan and L2 going to "P" and the load side "cool" term. My question is, can the 120v L1 sit on the motor with out harming the coil with what to me would be a low voltage condition to the motor. This is a 240v fan (I have not seen it to know if it a single or two speed)
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Yes, but you need a way to disconnect all power to the fan, double pole switch or disconnect.
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Deep Cover
backstay said:
Yes, but you need a way to disconnect all power to the fan, double pole switch or disconnect.
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Many of the commercial style exhaust fans I've done come with a HP rated switch on them as the disco.
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B
Good point on the service disconnect.

So I take it no harm will be done to the motor windings because the motor is not operating and drawing any current with only one of the two legs energized, until the stat calls?
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