how to check amp draw on a blower motor

chheang March 22, 2022 amp , on , to Comment

Open up the blower compartment of the furnace or air handler. Divide the watts of a given electrical item by the total number of volts available from the electric outlet to calculate amperage draw.

Hvac R Amp Draw For Blower Motor Pt 1 Youtube

That includes the secondary heat exchanger the evaporator coil etc he said.

. HOW TO MEASURE BLOWER MOTOR AMP DRAW Test Instruments. What causes a motor to draw lower than normal amps. I have tried a few different ways but none seem very easy or accurate for that matter.

Open up the blower compartment of the furnace or air handler. On the other hand if the motor runs at a voltage higher to its rated limit then the current will be drawn less. Measure the supply voltage to the blower as its running to be sure there is adequate power supplied.

As a part of our PMs we measure the amps that the blower motors are pulling. Just wondering how everyone else is handling this. While checking the unit today I noticed the motor that was replaced two years ago was drawing 77 with a FLA of 75 The service factor on the motor is 10.

The connector on your Fords blower motor will have a BRNORG wire and a PNKWHT wire. The blower motor gets power and Ground from the 2 wires that connect to it. Lets get started.

Read the multimeter display and then immediately remove the sensors from the AC motor. I dont know what the amperage should be. Check the amp draw against the manufacturers fan performance data to verify the airflow that the fan is producing.

The furnace has had the blower motor replaced in it twice. 4 Divide 125 by the resistance value you got in step 3. 2 Place your multimeter in Ohms mode.

Turn off the motor. The reduced voltage causes the blower motor to draw proportionally. Then well divide the resistance value by 125 to calculate its amperage draw Ohms Law.

Using a multimeter to measure current requires that you break the circuit and put the meter in series with the blower motor. Either the motor is running at below the rated load in this case as the motor is not delivering the rated power it is supposed to deliver it will result in lower efficiency. Maximum current draw blower motor Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here Maximum current draw blower motor This topic contains 2 replies has 2 voices and was last updated by Jimmy 5 years 3 months ago.

If its below the range get your motor checked as it may require maintenance such as new brushes. What well do to check to see if the blower motor is fried is to unplug the blower motor from its connector and manually apply. If it will go high enough you can insert the meter on the positive side from the battery to the controller with the positive lead from the meter to the positive lead from the battery and the negative meter lead to the positive wire to the controller.

To find out the amperage draw well test the blower motors resistance. Under the glove compartment door there is a soft panel that can be moved out of the way exposing a brown wire which is the ground for the blower. The amperage draw of your Dakota or Durangos blower motor should be under 40 amps.

Stop running the blower continuously or. What should the AMP draw be on a blower motor. Amp draw should be approx 13-17 amp when blower is operating on high mode.

1 Disconnect the blower motor from its electrical connector. DCAC 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 sayfor the question im sticking with 30a. When you pull the door off of a variable speed unit the motor ramps down and any measurement taken then is not true to conditions.

I know that this is barely over FLA but I normally see these 12 hp motors drawing 4-5 amps at maximum. This will reduce energy consumption but dont expect more than a 50. Connect the amp clamp from your electrical meter around the power wire.

Saturn s-seriesDisclaimerThis video is not meant to be a definitive how toAlways consult a professional repair manual before starting your repairI am not. If you have an amp clamp you can just clamp it around the blower power wire for a measurement. If the ampere reading is within the range you set on your multimeter the AC motor is drawing the correct amperage.

3 Measure the resistance of the blower motor with your multimeter. Youll be testing across the blower motors connector. If the motor is direct-drive these numbers can be difficult to read.

If your volt meter has a DC amp option you can check it with thatalthough many meters will not go above 10 amps. Each gets half the voltage but because their resistance hasnt changed the halved voltage can only drive half the usual amperage as well. Theoretically if you hooked your blower motor up to 120v your current draw would be less by a ratio of 101 12v x 30a 360 watts.

Depending on the furnace electrical components cant get specific here may need to be added. Dont just replace the motor and run check things over thoroughly. The amount of current flowing through the wire is measured in amperes or amps.

Check all related circuit wiring and replace blower motor if higher than normal amperage draw is detected I have a multimeter but am confused to where and how to use it for amp draw. Find the Full Load Amp FLA rating of the blower motor. Engine running AC on fan on high setting 4 and the meter measured 198 amps.

Have the blower motor wirewired so that continuous fan operates on low speed. The equivalent of available electricity at the power source is voltage or volts. Each bulb ends up drawing 25 watts and the entire circuit draws 50.

Locate the power wire leading to the blower motor. The resistor lowers the voltage consuming a small amount of power. Amps Volts Ohms.

Check the rotation of the fan. Applying Power And Ground To The Blower Motor. Measure the current draw when complete to make sure its within proper parameters.

This brown wire is used to ground this Jettas blower motor.

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