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Posted by jamesgangnc on January 22, 2008, 8:00 am
Just get yourself a small 115v relay and wire the relay coil in parallel
with the blower motor leads. Might be able to use piggyback spade
connectors at the control board if the motor leads use spade connectors.
>I bought a current sensing relay model A50 to assist in control of my
>add-on humidifier, yeah I have an old furnace.
>
> I installed the senser over the common wire going to the blower motor, at
> least 8" away from the nearest transformer (it says at least 3" in the
> instructions). When the blower comes on the humidifier comes on as it
> should, but when the blower shuts off, the humidifier continues to run, so
> the A50 is not cutting the circuit like it should. If I shut the main
> power off to the furnace and turn it back on, then about 4 of out of 5
> times the A50 recognizes the power loss and turns off the humidfier. Even
> if I remove the A50 from the common wire while the blower is on and hold
> it away from the furnace it does not recognizes the power loss (it must
> only monitor for spikes/surges).
>
> Per the instructions, "wire lead must carry min of 4 amps for proper
> operation, if not wrap lead wire around bracket two or more times." OK,
> right now I don't know about the 4 amps, but if I have to wrap the common
> around this bracket then I will have to splice it and insert a fews inches
> of wire. Thats not a big deal, unless I've got a bad senser. Any Ideas?
>
> Thanks,
> Jim
>
>
>
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