Trane YSC120 Fan Speed

Adjust the fan speed on a Trane YSC120

[@Jason-wc3fh]

Had a YSC120 like this recently. It had the older style fan speed control that was a rheostat. The unit was 600v. Anyways, the blower stopped working. Found out the transformers it uses to drop the voltage from 600 to 460 were blown. So we replaced those, still didn't work. Then we found out the rheostat for the blower speed was fried, so we tried to order that, but it had been superseded by two kits. One being the fancy little digital controller called the ECM, and the other kit being the electrical harness adapter, little backer plate, zip ties, and couple of screws... I'd say the harness kit probably consisted of about $20 of parts. Wel,l that harness kit was actually $1,600 without tax from Trane. Needless to say, this blower fix (without actually ever touching the blower itself or its ecm module behind the motor) totalled over $5000 for the customer. So for anyone interested in a unit with this technology, stay far FAR away.