Question about Aprilaire 550 Humidifier

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Hooking up a used 550 to a new 80% trane UD-R9V,

I'm confused why I'm getting 14v off of the B/K and R terminals for my humidistat on my new Trane variable speed 60,000 BTU 80% furnace? Here is the Trane schematic, Page 15, note #9 explains the installation for the TUD060R9V3K
 http://www.aireng.com/clientuploads/Trane_Data_Guides/Furnace/tud_r9v.pdf  
It also tells in the manual to snip the w/14 loop on the board, which we didAny help would be greatThanksWill 

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  • brian baldwin May 11, 2010

    when the bk jumper is cut, it prevents the fan from running at full speed unless there is a call for fan at the bk terminal. with the bk jumper cut, you will only get about 80% fan speed. it really isn't necessary to cut the jumper to get your humidifier working properly. need to know if you have an air conditioner/heat pump hooked to this furnace and if it is a single speed a/c or heat pump. can you provide the model number of your outdoor unit.

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In this situatioin you'll eed a second transformer 110volt to 24 volt to relay from w to common to operate only when furnace being called for.

Posted on Mar 12, 2009

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