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I have a ruud centralac unit, i keep burnning up blower motors.im looking for a wireing diagram to fix the problem.diagram of signal wires to unit from thrmostat,also diagram of the internal wireing.can you help me?

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What's the model number? You can try going to this site and looking for your manual:
http://ruud.com/productSearch.aspx
Good luck.

Posted on May 27, 2010

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On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

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