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Contents
How many amps should a blower motor pull?
Up to 20 Amps or more. Amperage is how much power a device is consuming.
How much current should a blower motor draw?
Read the amp draw of the blower motor.
Check the amp draw against the manufacturer’s fan performance data to verify the airflow that the fan is producing. A rule of thumb is that on high speed most motors will draw 70-100% of the FLA if it is moving the required 400 CFM per ton on residential systems.
How do you test a blower motor with a multimeter?
Turn off your vehicle, set your multimeter to Ohms, and check for resistance between the blower’s positive and negative terminals. You may also turn the car key to run without starting the engine, put the cooling system at full blast, and check for DC voltage. If none of these produces a reading, the blower is bad.
What causes a fan motor to over amp?
Overamping occurs when the amperage drawn by the fan motor exceeds the fan motor nameplate amperage. In other words, more horsepower is required than the recommended maximum for the motor.
What happens when a motor over amps?
Electrical overload or over-current is caused by an excessive current flow within the motor windings, exceeding the design current which the motor is able to carry efficiently and safely. This can be caused by a low supply voltage, resulting in the motor drawing in more current in an attempt to maintain its torque.
How many amps does a forced air furnace draw?
Q: How much electricity does a gas furnace need? A: A gas fired, forced air home furnace typically requires a small amount of electricity to ignite and operate in your home. Most gas heat furnaces use less than 600 watts of electricity, or less than half of a typical 15 amp electric circuit.
What causes a motor to draw high amps?
What Causes a Motor to Draw Higher Amps? Motors require a certain output in watts in order to function, and this is the result of a voltage multiplied by amps. So when voltage falls, resistance scales up in order to supply the difference, and the motor will also draw more current.
What causes a fan motor to over amp?
Overamping occurs when the amperage drawn by the fan motor exceeds the fan motor nameplate amperage. In other words, more horsepower is required than the recommended maximum for the motor.
How many amps does an air handler use?
Central AC Electrical Requirements
Central air conditioning units require 208/240 volts. They must be hard wired and have a dedicated circuit. Units require anywhere from 15-60 amps depending on how many tons they are.
How many amps should a furnace blower motor draw?
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- Most searched keywords: Whether you are looking for How many amps should a furnace blower motor draw? Updating Up to 20 Amps or more. Amperage is how much power a device is consuming. The Amps will be labeled on the motor’s name tag. It can either be labeled Amp or FLA, which is the max the motor is rated to run at.
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Use the Correct Multi-Meter with an Amp clamp
How To Measure the Amps a Motor is Using
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Measure the AMPs on a Blower Motor or Condensing Fan Motor – HVAC How To
Checking the AMP Draw is important in HVAC for troubleshooting or testing for a potential problem.
Furnace blower motors and condensing fan motors Amp draw are checked to see if they are Over-Amping or, in some cases, Under-Amping.
Every electric motor has a set Amp and voltage rating that the motor should run at. This information will be listed on a name tag on the motor. Voltage can be 120 volts, 240 volts, and 460 volts; Amps can range from .01 to 20 amps or more.
Example condensing fan motor 230 volts 1.9 Amps.
Amperage is a measure of power being consumed by an electrical device. Furnace blower motors and condensing fan motors will have the Amps labeled on a name tag on the motor. It can be simply labeled Amp, or in some cases, FLA (Full Load Amps), which is the max the motor is rated to run at.
When a motor Over-Amps, it is drawing more current than it was designed for, which will shorten its life and burn the motor up.
For example, if a condensing fan motor has an Amp rating of 3 and after measuring the amps, it is using 5-amps, you know there is a problem, and it needs to be fixed before the motor burns up.
An electric motor will get very hot when it is over Amping; possible causes are the Start Run capacitors.
Use the Correct Multi-Meter with an Amp clamp
A correct multimeter needs to be used when measuring amps so as not to burn up the meter.
HVAC multimeters are specifically designed and often use what are called Amp-Clamps, where a clamp is simply clamped around one of the wires the motor is pulling power from, and it will display Amps.
Multi-meters that don’t have what is called an Amp-Clamp which use the leads from the meter set in the circuit to measure Amps.
Be sure your meter is set up to handle the voltage and Amps required before doing this, or it is possible to burn up your meter and possibly be shocked.
How To Measure the Amps a Motor is Using
Take caution when measuring Amps or Voltage as HVAC has high voltage running to units. Also, be aware of moving parts such as the fan blades.
If you have a meter with an Amp Clamp, it will simply need to be clamped around a wire that is pulling power, which are the wires coming off the motor and going to the pole, 120 volts, 220 volts.
Only one wire is used to measure the Amps while the motor is running.
If you don’t have an AMP clamp but do have a meter that can handle the voltage and the Amps the motor is pulling it will need to be placed into the circuit.
For example, you have a 120 Volt 2 Amp furnace blower motor and need to measure the Amps. One of the wires for the 120 volts will need to be pulled out and placed on one lead. The other lead will go where the wire was pulled from, putting the meter in the circuit.
Blower motor draw
By Steve Schaeber, MACS Technical Editor
Recently, I posted to the MACS WordPress blog and covered a fuse issue on a 1999 Volkswagen Jetta. In response to my post, I received a comment from reader Bruce Caron. Here’s an excerpt from his message:
As a former VW dealer tech, can I add a bit to your diagnosis? You would have done a better job had you, after replacement of the fuse, used an amp clamp to verify that the blower motor was not drawing an excessive amount of current. Could be maybe a dirty cabin air filter or the blower was just tired? Any time I do a blower motor or have a blown fuse, I will always check the current draw just to be sure.
So to follow up, I decided to go out and check the current draw of the blower motor on that Jetta. After all, that would be the correct way to test the system after fuse replacement and verify it’s operating properly. You may remember from the original post, the fuse was number 25, which is a 25 amp fuse. I’m not exactly sure why it blew in the first place; the system wasn’t working and replacing the fuse fixed it. I normally wouldn’t bother to find out why or verify the repair through ohmmeter testing because the vehicle is 15 years old, and sometimes fuses just blow. In this case, I know the vehicle owner installed a new cabin air filter in July, but I’m not so sure about the motor. So, I did just like Bruce suggested, grabbed my clamp amp and a few hand tools, and went out to the Jetta. 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. Engine running, A/C on, fan on high (setting 4) and the meter measured 19.8 amps.
Image 1: This brown wire is used to ground this Jetta’s blower motor.
To take this diagnostic test a little further, I tested all four fan speeds under two conditions: both with the recirculation button turned on and off. I wanted to see what difference the re-circ would make, if any, but also wanted to see what the difference in current draw would be amongst the different speed settings. Here’s what I found:
Fan Speed With Recirculation Without Recirculation
4 19.8 Amps 18.0 Amps
3 11.5 Amps 10.8 Amps
2 6.8 Amps 6.5 Amps
1 3.9 Amps 3.8 Amps
There are a few things we can learn from this chart. First, at the highest fan speed setting the motor is drawing under 20 amps, which is much less than the 25 amp rating of the fuse. But this chart also tells us a few things about the relationship between blower motor speed, motor current draw and the position of the re-circulation door. Naturally, we would expect to see current draw increase as fan speed increases, but we’re seeing a larger increase when re-circulation is commanded.
Image 2: It’s relatively easy to connect an amp clamp and measure current draw.
Blower motor amperage is not only affected by fan speed, but also by the load placed on it. The motor is turning fastest with the speed set to 4, but the motor is also working harder when recirculation is turned on, and therefore is drawing more current. That being said, why then is the current draw so much closer together at speed 1? Since the motor is turning so slowly, the application of recirculation does not cause as much of an effect on the motor’s current draw. Sure, it probably is working a little bit harder, but since it’s not moving as fast, the increase in draw is negligible.
Image 3: The curve of the graph becomes more pronounced as fan speed increases in re-circulation mode.
Want to take this test a step further? Here’s a neat experiment to try: With re-circ turned on, block the air intake with an old shirt or a stiff piece of paper or cardboard, such as from a cereal box. What will happen to the amp reading?
Will it increase or decrease? You might be surprised by what you find. Respond to this blog or send an e-mail to: [email protected] and let me know your results, which we’ll explore in an upcoming MACS WordPress blog.
Thanks for your comments, Bruce!
If you’re a service professional and not a MACS member yet, you should be! Become a member and receive a technical newsletter with information like what you’ve just read in this blog post visit http://bit.ly/10zvMYg for more information.
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Mobile A/C professionals should plan to attend 35th annual Mobile Air Conditioning Society (MACS) Worldwide Training Conference and Trade Show, Meet me at MACS Make Connections that Matter, February 5-7, 2015 at the Caribe Royale, Orlando, FL.
How do you check amp draw on a motor?
HOW TO MEASURE BLOWER MOTOR AMP DRAW Test Instruments. First, Safety. The Test Procedure. Open up the blower compartment of the furnace or air handler. Check the rotation of the fan. Locate the power wire leading to the blower motor. Connect the amp clamp from your electrical meter around the power wire. Read the amp draw of the blower motor.
Read everything about it here. Besides, what causes a motor to draw high amps?
The most common causes of high no-load current after a motor is rewound are incorrect winding data and stator core damage. Incorrect winding data that increases the magnetic flux levels as compared with design levels will result in increased no-load current.
Beside above, how many amps does a motor draw? Common Horsepower to Amps Conversions
Horsepower Amps Voltage .75 HP 5.18 A 120 V 1 HP 6.91 A 120 V 1.25 HP 8.63 A 120 V 1.5 HP 10.4 A 120 V
In respect to this, how do you test a small motor?
Ensure it is set to measure volts as multimeters. It can also measure amperes and ohms. Place the copper sensors running from the multimeter onto the metal terminals on the small electric motor. The sensor on the end of the red wire from the multimeter touches the terminal that has a red wire attached.
How do you test a motor using a multimeter?
Set your multimeter to Ohms. Start by completely disconnecting the spindle motor from all power sources. Check each wire, including T1, T2, T3 and the ground wire. If the reading is infinite, your motor should be fine.
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