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    jbc97301's Avatar
    jbc97301 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 25, 2007, 09:27 AM
    Fan speed control
    Can the furnace fan speed be controlled by a rheostat or other device?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 27, 2007, 01:36 AM
    Yes but it is not recommended. Mimimum air requirements,
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #3

    Jan 27, 2007, 10:06 AM
    Can I ask why? There is a device for motors that will cause the blower to gradually increase and decrease RPM, but they shouldn't be used on cheaply made motors.
    IAQ Direct - About FanHandler Inc.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Jan 27, 2007, 10:40 AM
    Can I ask why? You sure can.
    BTW A friend of mine owns fanhandler and his name is richard and there products are great for variable speed TEMPERATURE controlled systems.
    The person who asked the question mentioned a rheostat and that is a speed controler that does not take into consideration the temperatures in the system. Burning up the heat exchanger or freezing up the evaporator by the use of a manual control is not my idea of a smart move. The Fanhandler is a seemless speed controler that will speed up automatically when necessary to keep the system from a overload condition. A rheostat will not do this and in my opinion is unsafe. Also a capacitor run motor does not like a rheostat anyway since a rheostat drops voltage and blower motors do not like that without some sort of diode/rectifier circuit. Been there done that got the shirt got the hat. I also thought I would mention that richard is not what the Fanhandler guy goes by but this site will not allow me to use his regular name. I will spell it backwards for you (kcid).
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #5

    Jan 27, 2007, 10:50 AM
    Can I ask why was not meant for you hvac1000. I think we both know why airflow adjustments should only be done by qualified service tech's. I also agree, don't use a rheostat, that is why I told them of fan handler.
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