Typically it's done by measuring the voltage at the blower motor connector when it's turned on. If there is a voltage at the motor (at least 4-6 Volt at low speed and 12 Volt at high speed), but the motor doesn't run, the motor is bad or jammed.Aug 1, 2021
How do you test a blower motor with a multimeter?
Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. To check the purple wire for current, use your ignition key and turn it to the run setting, turn the heater power to full power and set the multimeter to DC power. If your meter reads "no current" the motor is no good.Mar 11, 2010
How do you test a 12 volt blower motor?
https://www.youtube.com/watch?v=9t8BkpavIoE
How do you check the voltage on a blower motor?
Keeping the black lead on a good ground, usually a bolt on the engine block, and the blower switch turned on, use the red lead to probe the plug that usually attaches to the blower motor. The meter should read between 9 and 11 volts or the test light will light up.
How many volts is a furnace blower?
220 volts should be measured for an air handler and 115 volts for a furnace.
How do you check furnace blower voltage?
https://www.youtube.com/watch?v=flbUtLMeSOQ
How do I test my furnace blower motor?
https://www.youtube.com/watch?v=JSgLGTAbDF8
Are blower motors interchangeable?
Blower motor sizes cannot be interchanged. They are sized to things like the blower wheel the return and supply opening. If you have a direct drive blower where the motor lies within the blower wheel then you cannot install a physically larger motor but can install a greater hp rated one.Feb 26, 2005
Are blower motors universal?
Motor manufactures make universal blower motors that can be wired to run at a wide range of settings depending how they are wired.Sep 15, 2020
How do I know what size blower motor I need?
The rule of thumb is the blower should produce 440 CFM (cubic feet per minute) of air per ton. On a two-ton system that is 880 cfm (cubic feet per minute). This usually calculates out to about a 1/4 to 1/3 HP blower motor.Jul 31, 2012
How do you match a furnace blower motor?
https://www.youtube.com/watch?v=TF3QtXWd8s0
How do I know what blower motor to buy?
To buy a new furnace blower motor the old blower motor face plate will need to be looked at. The tag on the motor will say the horsepower, RPM, Voltage, and amps. The model number can be used but in many cases old model numbers don't match up to new ones.Sep 15, 2020
How do you calculate CFM for a blower?
CFM = (fpm * area), where fpm is the feet per minute. To find the cubic feet per minute, substitute the FPM value with the area after the area is squared.Mar 24, 2017