Wiring Help - Replace Old Humidifier on Old Furnace

Just moved in to a house built in 1968. Furnace is a Worthington Climatrol 170-130 with a disgusting mildew-ridden humidifier attached to it. It's a Kenmore Central Humidifier 3000 that looks like it hasn't worked in years. I bought a Honeywell HE360A Flow-Through with H8909B humidistat. I'm a handy guy, but much of the lingo here is new to me.

I understand how the basic installation should work, but my main question is - can I set it up so that the humidifier triggers the fan on the furnace to come on to circulate the humidified air without disrupting normal operation of the furnace and fan? Is this a bad idea?

The old Kenmore humidistat has wires going to the furnace and to the humidifier - looks like 120v to me. I peeked inside the furnace where the wires are attached to others wires, but nothing seems to be labeled, marked, or color coded. Any tips on how to wire this thing up?

I'll be installing the humidifier on the warm side, where the old one is now. Humidistat will be on the cold side.

Finally, should I tap into hot water for maximum humidification, or will that just waste a lot of hot water down the drain?

THANKS!
Tom

 

Do you have transformer and what is used for switching the unit on when the fan runs? A50 relay or sail switch?

Keep it simple, just let the unit run when your furnace runs.

 

Thanks for the reply, Jay.

I have a sail switch to allow the humidifier to run the same time as the furnace. I'm just concerned that the furnace won't be on often enough or long enough for the humidifier to really do its job.

Tom

 

If your furnace is sized right, it should run enough.. But if it's over sized and cycling on and off often, then yes, it's not going to do it's job..

You could turn the fan to "ON", to help out..

 

Thanks again, Jay. I'll go with that.

I appreciate the help!

Tom