Question about Honeywell HE260A1010 Whole House Humidifier Humidifier

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How does transformer hook up

I purchased a bypass flow through humidifier from Honeywell and replaced and older unit. Installation was easy as I used the old thermostat and unit appears top be running fine... The problem is a had an extra part,, the transformer...The instruction did not show how to hook up and my question is do I need it, if I did not change the humidity thermostat?? The unit is a Honeywell HE220A,B

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If you just replace the unit and it is working, no your do not need the tranformer. The unit is getting power from the furnace. For reference though. The black and white wires are your 120 volts. Black hot, white common. the 2 screws are your 24 volts

Posted on Dec 23, 2008

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1 Answer

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control board has eac terminal . will provide 110v to hum transformer anytime fan running.

also can pick up current sensing relay to sense blower power up and will then power the Hum. transformer.

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6 Answers

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I also had the transformer problem and it was made worse but an HVAC guy who rewired the furance fan to get more air flow when he installed a new AC unit. He left the humidifier wired to the old fan windings which were now putting out 160 induced volts. The humidifier transformer, which was already undersized by Honeywell, never had a chance. Not sure how common this problem is but I later saw several references to the same problem on other websites and it's worth a quick check of the supply voltage to your humidifier.

Since I had an expensive humidifier and a whole cut in the furnace duct, I looked for a fix. My solution was to buy a $15 transformer from a BigBox that matched the voltage and was oversize on amps and mounted it externally to the humdifier (much like a furnace transformer is typically mounted). I then completely removed the piece-of-junk humidifier circuit board and wired the transformer directly to the water solenoid which it controlled and wired the fan and new transformer directly to 120V that is controlled by a current sensing relay (Aprilaire A50) on the furnace fan wires (and also controlled by a humidistat located on return air plenum).

It has worked fine for two years now, runs only when the fan is on and when the humidistat is asking for more humidity. A relatively cheap fix that would have only taken an hour if I had done it right from the start.
For those of you who haven't bought the Honeywell 360A yet - don't. For those of you like me that spent the money and cut holes in your duct - this is one solution.

Maybe Honeywell will wise up and redesign their transformer PCB to be much more robust. The rest of the unit is a pretty good design.

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