Scenario: Two gas fired water heaters with exhaust vent/fans are being supplied with fresh air from a duct with an auxillary vent/fan. The motors are plug connected to a receptacle mounted on top of each WH, so tapping into the temp controlled exhaust fan feeds to control and feed the aux. vent fan seems to be an unintrusive endeavor, and should keep the warrenty intact. All three motors are less than 2A FL each...

Here's my idea on how to use two 10A ice cubes to allow the auxillary vent fan to operate when either of the two w.h.exaust fans come on, and the aux. vent fan be off only when both W.H.s are off. All this without creating a parallel path...

My kingdom for a relay/contactor that has two independant coils that switch a single contact.

[Linked Image from users.stargate.net]

This could be easily adapted to involve a seperate feed for the aux. vent fan, and/or have said load going through a more robust contactor, with the leads marked "to aux vent fan" going to the contactor coil.

Kosher?

Is ther a simpler/cheaper way?

Thanks in advance...

-Virgil

[This message has been edited by sparky66wv (edited 05-25-2002).]


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI