View Full Version : Carrier humidifier question
10-22-2005, 01:01 PM
Almost complete with an install of a Carrier 2 stage furnace, air purifier, electronic air cleaner and humidifier. I'm going to be going back on Monday to finish up the job and test everything.(My helper dropped the bulb for the purifier taking it out of the box). Anyways, my question is(being that it has been about 5 years since I have put in a humidifier and we used an opened box one(no instructions). Is the best way to wire these is so that whenever it calls for humidity it kicks on the furnace? R and W. Or should I wire it R and G so only the fan comes on per a call for humidity. I think, and my co-worker disagrees(boss is on vacation) that it should be R and G, that way the thermidistat(mounted on the return) doesn't override the thermostat and kick on the heat during a humidity call. Who is right?
BTW, will have pictures on the wall of pride Monday night, you can dissect me then.
10-22-2005, 02:34 PM
Use the HUM terminal on the furnace control board.
Find your model here (http://www.commercial.carrier.com/commercial/hvac/general/0,,CLI1_DIV12_ETI8991_MID4373,00.html) and download the installer's guide.
10-22-2005, 03:09 PM
Don't I feel like an idiot. Guess that's what I get for not putting these things in enough. Also being that I just got back into installing carriers. By the way, what does the adapter plate for the humidistat do? I installed it on the return duct so obviously I will need to get that too. Also am interested to know if there is a table for setting the humidity level dependant on outside temp and hum. and indoor temp and hum. Thanks
10-22-2005, 03:15 PM
is that a fan powered hum or bypas if fan powered you have to use and isolation relay if you hook up to the hum terminal, carrier requires it, so the hum doesnt back feed to the board, they claim it can cause fires
10-22-2005, 09:04 PM
It's a bypass so not a concern.
10-23-2005, 08:13 AM
You did not say what kind of furnace only two stage.You might need to set a dip switch when using a hum.
10-23-2005, 02:06 PM
It's a CTA so no dip switch changes are necessary. I got er figured out now. What I originally did was wired it to R and W and I knew that wasn't right. SO on Monday, I will switch it to Hum and then C on the LVTB and should be good to go. Thanks all for the info
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