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gregger77

Member Since 01 Jul 2007
Offline Last Active Oct 29 2012 05:17 PM

#241021 YouTube of my Noisy Motor. Too Noisy?

Posted by gregger77 on 19 October 2012 - 01:47 PM

Or just replace the motor when the noise becomes unbearable


Yup, that's the current plan! I do frequent eBay and have found "good" used motors for about $60. Craiglist, I never thought of for appliance parts because it's not set up for non-local buying.


#216538 Trane XL80 TUD120R954K1 Won't Light

Posted by gregger77 on 05 December 2011 - 10:02 PM

The spec is actually part of the part description in most places, ie., "80v Silcon Nitride Hot Surface Ignitor." It is also in the manual for the control board (found out mine is White Rogers CNT03077; a web search turned up the manual). The voltage can vary between 70 and 100 volts.

http://www.scribd.co...%80%93-CNT03077

Turns out, the board "learns" the lowest possible voltage that will successfully power the ignitor. It does this by lowering the voltage (via sine-wave "clipping," not via a transformer) at each call for heat, until it finally fails. Then, on retry, it bumps the voltage back up slightly, and, if successful, will retain the "good" voltage for the next 255 calls for heat! Then it will start the learning process over again (or, whenever there is a need for an ignition retry or a total furnace power recycle). As a result, the life of the ignitor is significantly extended!

In any case, the bottom line is...bad igntor and as you suggested, I'm replacing it tomorrow! The old ignitor spec has been changed, to a new part IGN00145 (replaced the old IGN00117), which maybe will last even longer?? My old ignitor lasted about 8 or 10 years...I don't remember when I put the furnace in, exactly...in a very cold weather climate.



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