Heres valuable information Id like to share with anyone seeking to understand the basics and differences in V-Belts. I dont completely agree with this assessment. Although Conventional belts can be substituted for L style belts which appear to be the same, L style belts should never be used as replacements for Conventional belts. 2L, 3L, 4L, and 5L prefix The L stands for light duty, and is designed for use with fractional horsepower motors. To be more precise The Span Length is the distance from where the belt is leaving one pulley, and is completely seated on the second. 5V & 5VX Belts = 21/32 (.65625) Inches Width x 17/32 (.53125) Height Your belt should spring back when you press down on the backside. Seek 1/64 (0.015625) of an inch deflection for every 1 inch of belt span length. The actual ratings will vary somewhat depending on the drive ratio and the center distances. Thats what makes your belt appear to have stretched.. Using a permanent marker, overlap the ends and mark any point between where the two overlapping end pieces. Proper tension and pulley to pulley alignment is critical, and necessary for long, satisfactory operation. What Are HVAC Enthalpy & Dry Bulb Part I, To transfer power from one shaft to another. For example, if the span length is 50 inches, the desired belt deflection is 0.015625 (1/64 of an Inch) X 50 = 0.78125, or 25/32 of an inch. There are often problems using notched belts in moveable sidesheaves. My experience with X designation belts is that they last longer than those without it. 365 0 obj
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Be careful when measuring a worn belt, they can and do stretch as they wear. C & CX Belts = Add 4 Inches to the Belt Number (Example C80 = 84 Outside Circumference) A & AX Belts = Add 2 Inches to the Belt Number (Example A80 = 82 Outside Circumference) I run this warning because common sense would lead you to believe a 3V belt is a comparable substitute for a 3L, or that an AVX belt is a suitable substitute for an AX belt. Fractional horsepower v-belts 4L and 5L (FHP) can be interchanged to the equivalent Classical A or B v-belt. ** When upgrading to classical or notched belts, check to make sure the sheaves youare using are appropriate for the higher HP belts. Especially in cases where one or more of the pulleys are small in diameter. While A and B belts can be an excellent upgrade and substitute for 4L and 5L v-belts, the opposite is not true. Required fields are marked *. Pressed steel sheaves cannot transmit the HP availablein notched belts. I recommend you follow this link and print as a reference guide. ** When upgrading to classical or notched belts, check to make sure the sheaves youare using are appropriate for the higher HP belts. Basic HVAC Tutorial. 65 0 obj
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4L Belt = The Outside Circumference (OC) Minus 2 Inches. The information below will not return an exact measurement as implied by the belt part number. V and VX belts are specifically designed for higher horsepower and longer center distance applications. 7.962 (Inch Outside Diameter) 0.625 (Profile Height of 0.3125Inch * 2) = 7.337 (Inch Inside Diameter). 4L Belt = 1/2 (.500) Inches Width x 5/16 (.3125) Height C & CX Belts =7/8 (.875) Inches Width x 17/32 (.53125) Height A & AX Belts =1/2 (.500) Inches Width x 5/16 (.3125) Height 8V & 8VX Belts = 1 (1.000) Inches Width x 7/8 (.875) Height Some examples follow: Use onlyFHP belts in die cast sheaves. And since industrial applications are typically higher horsepower running at higher RPM, the belts need to be tightened more than non-industrial applications, which make the V and VX belts better. Some examples follow: Use onlyFHP belts in die cast sheaves. By continuing to use this website, you consent to the use of cookies in accordance with our Cookie Policy. (Example 5L380 = 35 Inch Inside Circumference). Two misaligned pulleys will quickly wear out belts and bearings as well as cause belts to fall off. Using a 5.4 pitch diameter sheave, the 5L belt will transmit 2.39 horsepower. Conventional Belts Part Numbers Reflect Inside Circumference (IC) Measurements in Inches. Example: 3L Section= (Part Number 3L450 = 45 Inch Outside Circumference). 3L Belt = 3/8 (.375) Inch Width x 7/32 (.21875) Height 5V & 5VX Belts = The Outside Circumference (OC) Minus 4 Inches. hUMHTQ~y3S.D"QXIe.1M.Z(&ml"AQVAM6Ci~wk;w7mT{
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] KxbOduEg)=_.-X0#&vY=p[^UC=E=g+yNNR/Fz@utgP|Jo3>8N_|;og I could take the time to better explain, but instead will defer to a brief instructional video embedded below. How Does An Air Conditioner & Heat Pump Work? The standards for some belt part numbers reflect the Outside Circumference (OC) of the belt, and others the Inside Circumference (IC). D & DX Belts = Add 5 Inches to the Belt Number (Example D80 = 85 Outside Circumference) If you are unable to read the belt part number, you will need to measure. Example: 3V Section= (Example 3V450 = 45 Inch Outside Diameter) The belt should always be seating and aligned to the center of each pulley. endstream
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L style belts are often designated as light duty industrial, or lawn & garden. Also, when multiple belts are used in industrial applications, the V and VX belts are narrower at the top to allow for a better fit. They do not make full contact against the bottom and walls, and therefore will fail to perform. Ill do my best to narrow them to what youre most likely to encounter in the HVAC Industry. Therefore, once you have obtained the part number, it will be easy to interpret and understand how to discover the replacement for an equal, or better quality belt. The information below will allow you to cross reference each belt type (Some Manufactures Slightly Vary): 3950 Doniphan Drive, Suite P El Paso, TX 79922-1356, Water Treatment Plant Horizonal Paddle Wheel Flocculator Tank Refurbishment, Roger Brown Co. Becomes Authorized Distributor of Bonfiglioli, ESC-Region 19 Purchasing Contract Holder for Industrial Pumps, Motors, Filters, Flow Meters and Related equipment. B & BX Belts =21/32 (.65625) Inches Width x 13/32 (.40625) Height B & BX Belts = Add 3 Inches to the Belt Number (Example B80 = 83 Outside Circumference) 5L Belt = 5/8 (.625) Inches Width x 3/8 (.375) Height Save my name, email, and website in this browser for the next time I comment. However, if you dont have one in your arsenal of tools, a straight edge as shown in the video below demonstrates the process. 25 (Inch Outside Circumference) divided by 3.14 (PI) = 7.962 (Inch Outside Diameter).
The more you tension a belt, the faster it will wear out. Dedicated To Serving The HVAC Industry With Quality Products Since 1965, MicroMetl Corporation 2020. What Is A HVAC Equipment Support & How Does It Work? You can also use AX or BX notched style v-belts. FHP belts are typically for low horsepower applications whereas B Section classical belts are for medium horsepower applications. Can I Interchange 4L and 5L V-Belts with A or B V-Belts? It is from Browning and is available for free. Common sense would be wrong. Your email address will not be published. Both belts will fit in the same sheave groove. 8V & 8VX Belts = The Outside Circumference (OC) Minus 5.5 Inches. 7.337 Inches (Inch Inside Diameter) * 3.14 (PI) = 23.04 (Inch Inside Circumference). (Example 3V500 = 46 Inch Inside Circumference) The V and VX belts are not as flexible as the A, B, C belts; therefore they are typically used with larger sheaves, and cannot be used with Backside Tensioning Pulleys. MicroMetl Instructor Robert Schram offers his thoughts on V & VX belt applications. Understanding the prefix of any belt part number is important. The prefix offers dimensional standards, and somewhat defines the purpose of the belt. Until I began to specify belts for HVAC Accessory fans and motors, I thought a belt was just a belt. 3V, 5V, 8V, AVX, BVX, CVX, DVX IMPORTANT: Dont Confuse V In The Part Number Prefix! Notched v-belts are about 3% more efficient than wrapped style v-belts. That stiffer characteristic also makes them better for the long center distance span. A, B, C, D, E, And AX, BX, CX, and DX size belts are more industrial. Therefore, to determine the inside measurement use the following simple rule of thumb. (Example 3V250 = 24 Inch Inside Circumference) Meaning a BX belts last longer than a B Belt. Therefore the measurements between the old and new may not be exact. This journey allowed me to discover one of the best pdf printable reference guides on the subject of pulleys and belts Ive ever encountered. Using a B section belt on the same 5.4 pitch diameter sheave can transmit 7.21 horsepower, which is three times the horsepower of the 5L belt. Upgrading from 4L and 5L v-belts to A/AX or B/BX can improve performance of your belt drive system with increased horsepower capability. The 5L and the B Section belt will both fit in the same sheave, but they provide dramatically different horsepower capacities. Now for reality, you dont have one A good Rule of Thumb, seek approximately Inch of deflection for a V-belt. To demonstrate the improvement of horsepower, lets compare 5L FHP belts to B Section wrapped belts. (Example 4L320 = 30 Inch Inside Circumference) by Abbie Stancato | Oct 21, 2015 | General. In addition, FHP v-belts only have about 1/3rd the design life of a Classical v-belt. You should always use a Belt Tension Tool and refer to the manufacturers specs for each belt. The actual ratings will vary somewhat depending on the drive ratio and the center distances. Never substitute or mix these belts. 770 0 obj
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3V & 3VX Belts = 3/8 (.375) Inch Width x 5/16 (.3125) Height Your email address will not be published. There are so many belt types available. 3L Belt = The Outside Circumference (OC) Minus 1-1/2 (1.5) Inches. This knowledge allows you to understand which belts can be substituted, and which cannot. Meaning less than 1 HP. The V and VX belts, on the other hand, may be better for 10HP and larger. According to the website BeltsForAnything.com, Belts dont actually stretch in length, the sidewalls wear from pulling, and your belt gets narrower. %%EOF
For example, most applications up to 7.5 HP where a single belt is being utilized, an A or B belt is more than adequate to do the job. D & DX Belts =1-1/4 (1.250) Inches Width x 3/4 (.750) Height %PDF-1.7
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Notify me of follow-up comments by email. Everyone hates this noise. Using a 4L or 5L belt in an A or B application will result in reduced performance and belt life. To convert the measurement to an Outside Circumference (OC), use the following information. * The v-Belt HP ratings are supplied as illustrations. 4L and 5L belts have lower horsepower ratings and design life compared to Classical A and B series v-belts. E Belts = Add 6 Inches to the Belt Number (Example E80 = 86 Outside Circumference). 25 (Inch Outside Circumference) 23.04 (Inch Inside Circumference) = 1.96 Inch Reduction From Outside Circumference to Inside Circumference, 2L Belt = The Outside Circumference (length) (OC) Minus 1 Inch. 2L Belt = 1/4 (.250) Inch Width x 5/32 (.15625) Height V-belts operate on the friction, multiplied by the mechanical advantage of the wedging principle (The majority surface area of the belt seated upon the pulley). 3V & 3VX Belts = The Outside Circumference (OC) Minus 1 Inch. Theyre sometimes referred to as Conventional belts. E Belt =1-1/2 (1.500) Inches Width x 29/32 (.90625) Height, Part Numbers for Fractional Horsepower 2L, 3L, 4L & 5L belts all reflect their circumference as an Outside Circumference (OC) measurement. Lay the marked string on a flat surface, and measure the distance between the two markings with a tape measure. There are often problems using notched belts in moveable sidesheaves. hOHTQ}Qt7fn!iZihcum, Too much tension results in excessive stress on belts, bearings, and (motor & fan) shafts. A password reset link will be e-mailed to you. 5L Belt = The Outside Circumference (OC) Minus 3 Inches. However, there is still a wide range of tension which a belt will operate satisfactorily. Example: A 4L Belt (0.3125 Inch Height when viewing the profile) with a 25 Inch Outside Circumference. Therefore, to determine the inside circumference measurement use the following simple formulas. Pressed steel sheaves cannot transmit the HP availablein notched belts. They do not fit properly into pulleys designed for 3L and AX belts. Alignment should be performed with the use of lasers. For those interested in the mathematical equation Outside Circumference, Divided by Pi, which equals the Diameter, Subtracted by the belt Height, Multiplied by Two, Multiplied By Pi. 0
The V designation in the prefix is a difference in the profile of the belt. Too little tension results in slippage, causing premature belt & pulley wear. V Belts Part Numbers Reflect Outside Circumference (OC) Measurements in Inches. Lets begin this section asking the question Can belts stretch? Pulley misalignment can occur as horizontal angularity, vertical angularity and/or axial offset as illustrated. Smaller diameter pulleys offer less stress on X style belts due to the notched under-bottom. If your fan system has developed a squeak the root cause could be due to the belt wearing out, dirty pulleys, belt is too loose, incorrect belt type, poor belt quality, oil on the belts, a bad bearing in a pulley, worn idler pulley, motor going bad, or belt misalignment. Always consult an owners guide for the proper tension range. To convert the measurement to an Inside Circumference (IC), use the following information. FxHC+)J&h"q.{s>.:k );@Hay-bNNO&s't7
oTVH9k|cm){DoI>X~Y,M*!Ja"KI"*QFgSDt#_V. Using a BX belt in this example would increase rating to 9.19 horsepower (a gain of 285%) and provide an efficiency gain of about 3%. All Rights Reserved | Designed by. The X is a standard specification for inside perforations also known as notched or cogged belts. Too often the belt you need to replace is either gone, the part number information is worn off, or the belt disintegrated when it broke. (Example 3V1020 = 96.5 Inch Inside Circumference). The intent is to find this proper range for any V-Belt drive. This is the. (Example 3L250 = 24 Inch Outside Circumference) }?.T#s{LI.`So!VW /aqzJ](TQG1siV>,NTp g},s*-oN$g1=}
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* The v-Belt HP ratings are supplied as illustrations. (Example 3L250 = 23.5 Inch Inside Circumference (IC)
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