This is because motors are rated in Watts or Horsepower and according to Watts law Watts = Volts x Amps. We need to see if the blower motor is drawing a high amount of current (above 40 Amps) because if it is, then it's defective. I know that this is barely over FLA, but I normally see these 1/2 hp motors drawing 4-5 amps at maximum. The service tech that comes out twice a year says that I need to replace my furnace motor. I personally have two different clamp on amp meters and both read 20amps peak at start-up and 7.8 amps constant. And that is from the breaker size not the actual current draw. While checking the unit today I noticed the motor that was replaced two years ago was drawing 7.7 with a FLA of 7.5, The service factor on the motor is 1.0. I have a 4 speed 1/2 hp motor. The Max Amps on the furnace plate says 8.5. ECM constant CFM ( almost allways incorrectly called variable speed and if we really want to be picky, it's pounds of air not boxes as in CFM) higher static faster rpm more work to try to maintain CFM higher amp draw. Highly unlikely the blower motor was rated at 1.8 amps. The running amperage under those conditions was found to be 16 amps. DC/AC is not different per say, so the voltage to current ratio stays the same, your blower is fused at 30 amps so that means it could be drawing 26-30 amps i would say(for the question im sticking with 30a). amperage is for the original conditions with a motor pulley of 8", a blower rpm of 875, and the 3000 cfm airflow rate. Have you ever noticed a blower motor rated for 120V draws about twice the amperage of the same horsepower motor rated at 240V? (it varies- there are multiple kinds of motors and my crystal ball reminds me of this often). The first thing we're gonna' do is to test the blower motor's amperage draw. It seems to me to be working just fine. Open up the blower compartment of the furnace or air handler. A blower motor could easily perform fine at 5 to maybe 8 or 9 amps depending on size of the motor and what it is rated for. During diagnostics, technicians should use an inductive amp clamp to check that the blower motor current draw is less than 80% of the fuse rating on high. The FLA is the full load amps or the amperage the motor will draw if it This causes the motor RPM to increase and the motor amp draw to decrease. The 16 amps is a full 7.5 amps under the FLA rating of the motor. HOW TO MEASURE BLOWER MOTOR AMP DRAW Test Instruments. ECM constant torque higher static will maintain torque (amps). The code says a 1hp motor at 120 draws 16 amps that is only 1920 watts. The mating connector should also be inspected for signs of damage caused by excess heat. Read the amp draw of the blower motor. Connect the amp clamp from your electrical meter around the power wire. Theoretically if you hooked your blower motor up to 120v your current draw would be less by a ratio of 10:1 12v x 30a = 360 watts PSC motor higher static less work less energy lower amp draw. If it is a gas furnace (which it sounds like) then it is 120 volts so that is only 2400 watts. The Test Procedure. Locate the power wire leading to the blower motor. The furnace has had the blower motor replaced in it twice. I agree with Kris even a small 3000 watt generator should run your furnace without even grunting. TEST 1: Testing The Amperage Draw Of The Blower Motor. He said that it is pulling too many amps. If the current is too high, replace the blower motor or the new resistor will also fail. Have them operate a centrifugal blower in free air with no restriction and measure both the amp draw and the fan RPM. First, Safety. In order to keep the Wattage output the same at 120V, it draws twice as much current. Check the rotation of the fan. The most convincing way to teach this concept is to have students figure it out for themselves using a centrifugal blower.
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