I hooked up a honeywell HE220A by-pass humidifier and the water is constantly running with the furnace on or off. I wired it the same way the diagram said using the transformer that plugs into an outlet, but can't figure it out. I have a very old furnace with a transformer that has the t-stat terminals on it and wired it to the terminals which worked fine for a few hours, shutting off the water when the furnace shut off, but then stopped working for good. When that happened I would just hook it back up to the transformer again. Any info would help thanks
Humidifiers - Honeywell - HE220A1019 Whole House Humidifier Humidifier
Answers & Comments
If you have very old furnace, does it have a blower with a belt. If it does it should only have 2 wires going to blower. If it has 2 you should be able to use the transformer you have plugged into wall and splice into 2 wires going to blower. If you have more than 2 wires to blower, you will need to find out which one is used for heat plus use the white one. If you have a voltage sensor you should be able to find it easily.