You might be surprised by what you find. You can still drive your car despite a faulty blower motor resistor. That being said, why then is the current draw so much closer together at speed 1? But he informed me that the blower motor was drawing 3 amps even though he said it's only rated for 1.8. All rights reserved. Melted connector at blower motor… Furnace Blower: 4.6 amp hours per hour X 4 hours on a chilly night = 18.4 amps (or 46 amps if it runs 10 ... It’s around 125 amp draw on the batteries. Thanks for your comments, Bruce! ROADFAR Heater Blower Motor 12V-3946686 Air Conditioning Blower Motor Fan Cage Fit for Volvo Truck 02-06 Single Speed. Ask Question + 100. The most convincing way to teach this concept is to have students figure it out for themselves using a centrifugal blower. 9.1 Amps … Any time I do a blower motor or have a blown fuse, I will always check the current draw just to be sure. This information will be listed on a name tag on the motor. 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. Here’s what I found: Engine running, A/C on, fan on high (setting 4) and the meter measured 19.8 amps. Fan Speed           With Recirculation           Without Recirculation Show Less. 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. To find out the amperage draw, we'll test the blower motor's resistance. RLA is running load amps, your minimum ampacity is 19, and the min fuse size is 25. Checked current on 60k replacement, and it is still 18 amps. Still have questions? Find the Full Load Amp (FLA) rating of the blower motor. Category: HVAC. We have pulled the pump and trimmed the impeller to reduce pumping capacity to lower the amp draw but it did not change the amp draw at all. This causes the motor RPM to increase and the motor amp draw to decrease.   There are a few things we can learn from this chart. Disconnect the negative and positive power supply. I went out and bought an amp clamp from Menards and started taking readings. Recently, I posted to the MACS WordPress blog and covered a fuse issue on a 1999 Volkswagen Jetta. Variable Speed Furnace Fans A standard fan motor will typically use about 400 watts per hour while a … … But, I am not able to wind the motor up to the full 12 volts. An increase in current is a danger to the motor only if that current exceeds the motor's nameplate current rating. Blower Motor Mount Gasket - 1957-58 Ford Car Part #: B7A-19484. Blower motor breakdown can be the result of anything from old age to failed bearings, high amp draw, electrical failure in the windings, dirt accumulation, and more. BillyHvac, Journeyman HVAC Tech. blower motor amperage draw Just curious how many amps the blower motor should be drawing on high - Saab 2005 9-3 2.0 question To locate a Mobile Air Conditioning Society member repair shop in your area. Posted on 28/04/2006 by Shaun. So overall your looking at say 30 Amps. VERTICAL BLOWER COIL UNITS BV SERIES VERTICAL BLOWER COIL UNITS Nominal Sizes 2 thru 10 Ton UNITED ELECTRIC COMPANY, L.P. 501 Part 2 — Products 2.01 EQUIPMENT A. 4                              19.8 Amps                           18.0 Amps Answer Save. It reviews best practices for diagnosing common electrical problems. According to the conversion table if it draws 1500 watts devided by … Thanks in advance!!? Ask Your Own HVAC Question. 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. General: Factory-assembled, vertical, draw-thru type fan coil (Optional) Disconnect for combined heater and motor amperage. Chances are you have a blower motor drawing too much current (too many amps) through your resistor. This category only includes cookies that ensures basic functionalities and security features of the website. Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. How many amps will the motor draw if the technician increases the blower speed from 400 to 475 rpm? By clicking “Accept”, you consent to the use of ALL the cookies. Blower motor AMP draw Hi All, This winter I decided to leave my blower on all the time. Have them operate a centrifugal blower in free air with no restriction and measure both the amp draw and the fan RPM. From low to high, It ranges from about 5a to somewhere near 15-20. It will just stop at say 9 volts. “The most common cause is dirt accumulation due to lack of maintenance,” said Tom Beaulieu, president of Bay Area Services Inc. in Green Bay, Wisconsin. I was shocked when I got my electric bill today. Could be maybe a dirty cabin air filter or the blower was just tired? I’m not exactly sure why it blew in the first place; the system wasn’t working and replacing the fuse fixed it. Click here to find out more about your car’s mobile A/C and engine cooling system. Sure, it probably is working a little bit harder, but since it’s not moving as fast, the increase in draw is negligible. It draws 34 amps for 1 second and 30 amps for the next 3 seconds and then settles to 8. 2                              6.8 Amps                             6.5 Amps Necessary cookies are absolutely essential for the website to function properly. Yahoo on nyt osa Verizon Mediaa. 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. The motors are 460 Volt 53 kW with a nameplate FLA of 77 Amps coupled to the blowers by belt drive The speed has been checked with a tacho, both motor and blower are as expected. 0 0. Want to take this test a step further? We spoke with Rick Love at Vintage Air, who told us a typical A/C system will draw 20-23 amps for the blower at "high blow," plus the clutch will draw another 3-4 amps. A condensing fan motor … | Privacy Policy. But you could also have a poor connection somewhere that gets disturbed whenever you replace the resistor, making it seem as though the resistor is at … You may remember from the original post, the fuse was number 25, which is a 25 amp fuse. Then we'll divide the resistance value by 12.5 to calculate it's amperage draw (Ohms Law: Amps = Volts ÷ Ohms). Told customer of our concerns, and he requested a used blower motor installed. 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. The greater the amperes the motor requires, the more powerful the motor. zt truck parts 12V Combustion Air Blower Motor 252069992000 252069200200 Fit for Eberspacher Airtronic D2 Parking Heater . 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. Anything from no air circulation to annoying or noisy operation. FREE Shipping by Amazon. Check for airflow restrictions in the duct, paying attention to debris on the evaporator or heater core. Get your answers by asking now. Blower motor is drawing too much power. On a GM or Chrysler, we would be alarmed that we would have this resistor fail again at this current. By Steve Schaeber, MACS Technical Editor 1 Answer. $43.99 $ 43. The calculated current draw based on speed and discharge pressure is 68 amps but the motors are reported to be drawing 90 Amps. If you’re a service professional and not a MACS member yet, you should be! 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. Qualifies for FLAT RATE SHIPPING* In Stock. However, you’ll probably find it uncomfortable to have the blower running at one speed setting the entire time. 99. At 575 volts, a 3-phase motor draws 1 amp per hp At 460 volts, a 3-phase motor draws 1.25 amp per hp At 230 volts a 3-phase motor draws 2.5 amp per hp At 230 volts, a single-phase motor draws 5 amp per hp At 115 volts, a single-phase motor draws 10 amp per hp Lisätietoja tietojesi käytöstä antavat Tietosuojakäytäntö ja Evästekäytäntö. Because this motor draws too high of amps we can only run 2 motors/pumps at a time. -Check the amp draw of the induced draft blower if vacuum to the pressure switch is low. 3                              11.5 Amps                           10.8 Amps INDUCED DRAFT INSTRUCTIONS Bi-annually, oil the induced draft motor in the ports of the front and rear motor bearings with 4 drops each of SAE 20 motor oil. The FLA rating of the motor is 12 amps and the rated HP of the motor is 5 HP. Open up the blower compartment of the furnace or air handler. After all, that would be the correct way to test the system after fuse replacement and verify it’s operating properly. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. The amount of energy drawn to drive the motor is measured in amperes and is known as current. The talk now is to swap motor "A" for motor "C" and see if the amp problem follows the motor or stay with the pump. HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 10 years ago. Here’s an excerpt from his message: Ford Car: 1962-70 $ 7.95 . A blower motor is drawing 8 amps. If a pulley of the correct size is placed on the motor to increase the blower rpm from 400 to 475 rpm, the motor amperage will increase from 8 amps to 13.39 amps. I only run my motors for about 1 minute or less to keep from over heating the motor. The wait about 3 minutes to finish the job of setting up the rv after it’s unhooked. Its low voltage that hurts the motors. 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. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. Amps can range from .01 to 20 amps or more. These cookies do not store any personal information. Anyway, the motor makes the buzzing and humming noise. Voit vaihtaa valintasi milloin tahansa Yksityisyydenhallinta-asetuksissasi. 1 decade ago. A car starter motor operates on 12 volts, but the amperes required to rotate the starter motor and the car's engine often exceed 50 … … Access Document. Check the cabin air filter for clogging. But opting out of some of these cookies may affect your browsing experience. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. So, I did just like Bruce suggested, grabbed my clamp amp and a few hand tools, and went out to the Jetta. Favorite Answer. Blower motor problems can cause many driver complaints. Image 1: This brown wire is used to ground this Jetta’s blower motor. 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. He gave me the option of changing out the blower motor, but that was going to be an … Thus, when voltage gets low, the current must increase to provide the same amount of power. … We also use third-party cookies that help us analyze and understand how you use this website. Don't confuse amperes and voltage, or assume that low voltage means low amperes. We measured the blower motor current on high, and it is drawing 19.5 amps on a 30 amp circuit. Relevance. Satisfied Customers: 25,084. Mahdollistaaksesi tietojesi käsittelyn Verizon Median ja kumppaneidemme toimesta, valitse 'Hyväksyn', tai valitse 'Hallitse asetuksia' saadaksesi lisätietoja ja hallinoidaksesi vaihtoehtojasi. Dombrus. Note that most centrifugal blowers cannot … You can E-mail us at macsworldwide@macsw.org . I would base it off that to start with, but you must also consider the indoor blower unit which is probably 120V and 3-7 Ampsfor 2.5 ton my guess is 3.5-4.5 Amps. When amps go above the nameplate rating, heat begins to build up in the motor. (The black wire is usually the negative.) Answered in 10 minutes by: 7/28/2010. Blower motor fuse blows repeatedly. I pulled the furnace fan switch electrical cover off and took a reading on the switch wire there with the clamp. 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. 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. Disconnect power from the blower motor by shutting it off at the disconnect box to the unit or unplugging the power... 2. 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. 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. Furnace blower motors and condensing fan motors Amp draw are checked to see if they are Over-Amping or in some cases Under-Amping. … So to follow up, I decided to go out and check the current draw of the blower motor on that Jetta. Automotive Blower Motor. 1                              3.9 Amps                             3.8 Amps HOW TO MEASURE BLOWER MOTOR AMP DRAW 1. The amperage draw, of your Dakota or Durango's blower motor should be under 40 amps. Join Yahoo Answers and get 100 points today. Will it increase or decrease? Yes the motor must draw over 10 amps as it blew the 10 amp fuse in the back of the dmm. Me ja kumppanimme säilytämme ja/tai käytämme tietoja laitteeltasi evästeiden ja vastaavien tekniikoiden avulla henkilökohtaisten mainosten ja sisällön näyttämiseen, mainosten ja sisällön mittaamiseen, yleisön näkemyksiin ja tuotekehitykseen. Depending on the manufacturer and model, a blower motor resistor can go anywhere between $3 and $335 on CarParts.com. Image 2: It’s relatively easy to connect an amp clamp and measure current draw. These cookies will be stored in your browser only with your consent. It is mandatory to procure user consent prior to running these cookies on your website. Voltage can be 120 volts, 240 volts and 460 volts. Tietoja laitteestasi ja internet-yhteydestä IP-osoitteesi mukaan lukien, Selaaminen ja hakutoiminnot Verizon Media -verkkosivustojen ja -sovellusten käytön aikana. As a former VW dealer tech, can I add a bit to your diagnosis? … Get it as soon as Sat, Feb 27. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. In response to my post, I received a comment from reader Bruce Caron. Qualifies for FLAT RATE SHIPPING* In Stock . 3. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Only 5 left in stock - order soon. So if your motor is drawing less than the rated amps it means that the motor is not doing the max work. What will happen to the amp reading? The amount of power the motor draws has a rough correlation to the voltage 2current (amps). Bronco: 1966-72. Share this conversation. Reciprocating Saw – Wikipedia, The Free Encyclopedia Draw … Respond to this blog or send an e-mail to: steve@macsw.org and let me know your results, which we’ll explore in an upcoming MACS WordPress blog. So the capacitor was $110, which I had to pay. What should be a typical amp draw for for a blower motor on a resdidential ac. Show More. Blower motor amperage is not only affected by fan speed, but also by the load placed on it. Because in some cases, even though the blower motor runs, it's drawing too much amperage that it'll eventually blow out the HVAC fuse, burn out the blower motor resistor block, and/or the blower motor switch. It really helped regulate the temp in the house. … 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. … Get Document Fits: Car: 1957-58 $ 3.50 ... Heater Blower Motor Gasket - 1961-72 Ford Truck, 1966-72 Ford Bronco, 1962-70 Ford Car Part #: C1UF-18583-A. You also have the option to opt-out of these cookies. This website uses cookies to improve your experience while you navigate through the website. Blower Motor Amp Draw. 3.9 out of 5 stars 7. So, if the blower motor's amperage draw is above the amperage rating of its fuse, then it' s defective and needs to be replaced. The heater blower motor is located behind the glove compartment of your vehicle. At the bottom of this page is a video that’s very popular. Fits: Ford Truck: 1961-72. The outside ac is only a 4 year old Trane, but the indoor furnace unit is a 2002 Coleman. 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. ©2021 MACS. He also said my unit was showing 1 lb low on refrigerant. If the motor… Does anybody know how many amps a car's heater blower draw? Every electric motor has a set Amp and voltage rating that the motor should run at. Image 3: The curve of the graph becomes more pronounced as fan speed increases in re-circulation mode. How many watts does a gas furnace blower use? 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.
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