On Oct 23, 3:19*pm, Tony Hwang wrote:
Nate Nagel wrote:
Given this wiring diagram

http://www.patriot-supply.com/files/...atic%20(90-225...

there's no connection for a humidifier, is there...?

My brain is working slowly this morning and I'm annoyed at having to
search all over the place for part nos. etc.

this is for a Rheem RGEB-06EC-FS furnace which apparently uses a
47-22481-81 fan control board. The "Honeywell S-890G" has been replaced
at some point with a S8910U. The schematic on the actual cover is
slightly different from the PDF and labels the blower control as a
"Honeywell ST780C" (or maybe 788? I took a photo of it and reinstalled;
photo is not as clear as it could be) Also "IDM board" is not present on
schematic on cover.

thanks

nate

Hi,
No big deal as long as you remember humidifier comes on when blower
runs and if humidistat calls for humidity.(so called AND logic)
And is depending on what type of humidifier.- Hide quoted text -

- Show quoted text -

Actually, wired the way he proposes, the humidifier will come
on as soon as the thermostat calls for heat, ie before it's even
ignited or the blower has started. I assume by blower we're
talking about the air handler, not the inducer.

I had my previous furnace done like that and it worked
perfectly. I think there is even some advantage to doing
it that way, as it cuts off the humidifier as soon as the call
for heat ends. The blower then runs another couple mins
giving it a little more time to take away some of the moisture
left in the media, instead of having it sit in the furnace plenum.