3l belt conversion chart

Two misaligned pulleys will quickly wear out belts and bearings as well as cause belts to fall off. How Does An Air Conditioner & Heat Pump Work? 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. To convert the measurement to an Outside Circumference (OC), use the following information. A password reset link will be e-mailed to you. 7.337 Inches (Inch Inside Diameter) * 3.14 (PI) = 23.04 (Inch Inside Circumference). FxHC+)J&h"q.{s>.:k );@Hay-bNNO&s't7 oTVH9k|cm){DoI>X~Y,M*!Ja"KI"*QFgSDt#_V. 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. 2L Belt = 1/4 (.250) Inch Width x 5/32 (.15625) Height I dont completely agree with this assessment. B & BX Belts =21/32 (.65625) Inches Width x 13/32 (.40625) Height C & CX Belts = Add 4 Inches to the Belt Number (Example C80 = 84 Outside Circumference) 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. What Are HVAC Enthalpy & Dry Bulb Part I, To transfer power from one shaft to another. In addition, FHP v-belts only have about 1/3rd the design life of a Classical v-belt. Seek 1/64 (0.015625) of an inch deflection for every 1 inch of belt span length. Especially in cases where one or more of the pulleys are small in diameter. Can I Interchange 4L and 5L V-Belts with A or B V-Belts? 5V & 5VX Belts = 21/32 (.65625) Inches Width x 17/32 (.53125) Height The actual ratings will vary somewhat depending on the drive ratio and the center distances. 8V & 8VX Belts = 1 (1.000) Inches Width x 7/8 (.875) Height 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. Required fields are marked *. The belt should always be seating and aligned to the center of each pulley. Save my name, email, and website in this browser for the next time I comment. This is the. Your email address will not be published. Using a 5.4 pitch diameter sheave, the 5L belt will transmit 2.39 horsepower. 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%. Example: 3L Section= (Part Number 3L450 = 45 Inch Outside Circumference). B & BX Belts = Add 3 Inches to the Belt Number (Example B80 = 83 Outside Circumference) It is from Browning and is available for free. 2L, 3L, 4L, and 5L prefix The L stands for light duty, and is designed for use with fractional horsepower motors. 4L Belt = 1/2 (.500) Inches Width x 5/16 (.3125) Height Fractional horsepower v-belts 4L and 5L (FHP) can be interchanged to the equivalent Classical A or B v-belt. 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. The intent is to find this proper range for any V-Belt drive. (Example 3V1020 = 96.5 Inch Inside Circumference). MicroMetl Instructor Robert Schram offers his thoughts on V & VX belt applications. Meaning a BX belts last longer than a B Belt. endstream endobj startxref However, there is still a wide range of tension which a belt will operate satisfactorily. Understanding the prefix of any belt part number is important. A, B, C, D, E, And AX, BX, CX, and DX size belts are more industrial. 7.962 (Inch Outside Diameter) 0.625 (Profile Height of 0.3125Inch * 2) = 7.337 (Inch Inside Diameter). The actual ratings will vary somewhat depending on the drive ratio and the center distances. Lay the marked string on a flat surface, and measure the distance between the two markings with a tape measure. Therefore, to determine the inside circumference measurement use the following simple formulas. 3V & 3VX Belts = The Outside Circumference (OC) Minus 1 Inch. If you are unable to read the belt part number, you will need to measure. Notify me of follow-up comments by email. They do not fit properly into pulleys designed for 3L and AX belts. Pulley misalignment can occur as horizontal angularity, vertical angularity and/or axial offset as illustrated. 4L and 5L belts have lower horsepower ratings and design life compared to Classical A and B series v-belts. By continuing to use this website, you consent to the use of cookies in accordance with our Cookie Policy. by Abbie Stancato | Oct 21, 2015 | General. My experience with X designation belts is that they last longer than those without it. Both belts will fit in the same sheave groove. You should always use a Belt Tension Tool and refer to the manufacturers specs for each belt. Your belt should spring back when you press down on the backside. 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. What Is A HVAC Equipment Support & How Does It Work? 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. Heres valuable information Id like to share with anyone seeking to understand the basics and differences in V-Belts. * The v-Belt HP ratings are supplied as illustrations. A & AX Belts =1/2 (.500) Inches Width x 5/16 (.3125) Height Proper tension and pulley to pulley alignment is critical, and necessary for long, satisfactory operation. Pressed steel sheaves cannot transmit the HP availablein notched belts. 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. Notched v-belts are about 3% more efficient than wrapped style v-belts. (Example 3V500 = 46 Inch Inside Circumference) While A and B belts can be an excellent upgrade and substitute for 4L and 5L v-belts, the opposite is not true. }?.T#s{LI.`So!VW /aqzJ](TQG1siV>,NTp g},s*-oN$g1=} |;p' mbUZ+Tgrc]uv+;o;3qO/L#V^SsO ?`*b0C|r\,{Zi vI Example: A 4L Belt (0.3125 Inch Height when viewing the profile) with a 25 Inch Outside Circumference. This knowledge allows you to understand which belts can be substituted, and which cannot. Be careful when measuring a worn belt, they can and do stretch as they wear. Using a permanent marker, overlap the ends and mark any point between where the two overlapping end pieces. This journey allowed me to discover one of the best pdf printable reference guides on the subject of pulleys and belts Ive ever encountered. 5L Belt = 5/8 (.625) Inches Width x 3/8 (.375) Height However, if you dont have one in your arsenal of tools, a straight edge as shown in the video below demonstrates the process. There are so many belt types available. 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. There are often problems using notched belts in moveable sidesheaves. 365 0 obj <>/Filter/FlateDecode/ID[<1989F138F9800E45AC463392A9C6D94C><30804C7C6118DE478FB9543D0BC9FC4E>]/Index[65 706]/Info 64 0 R/Length 647/Prev 933415/Root 66 0 R/Size 771/Type/XRef/W[1 3 1]>>stream Common sense would be wrong. 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. Now for reality, you dont have one A good Rule of Thumb, seek approximately Inch of deflection for a V-belt. To convert the measurement to an Inside Circumference (IC), use the following information. 0 (Example 3L250 = 23.5 Inch Inside Circumference (IC) Your email address will not be published. 3L Belt = 3/8 (.375) Inch Width x 7/32 (.21875) Height 8V & 8VX Belts = The Outside Circumference (OC) Minus 5.5 Inches. Everyone hates this noise. Therefore, to determine the inside measurement use the following simple rule of thumb. 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. Dedicated To Serving The HVAC Industry With Quality Products Since 1965, MicroMetl Corporation 2020. To demonstrate the improvement of horsepower, lets compare 5L FHP belts to B Section wrapped belts. The V and VX belts, on the other hand, may be better for 10HP and larger. 3L Belt = The Outside Circumference (OC) Minus 1-1/2 (1.5) Inches. V Belts Part Numbers Reflect Outside Circumference (OC) Measurements in Inches. The X is a standard specification for inside perforations also known as notched or cogged belts. Meaning less than 1 HP. E Belts = Add 6 Inches to the Belt Number (Example E80 = 86 Outside Circumference). That stiffer characteristic also makes them better for the long center distance span. 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). A & AX Belts = Add 2 Inches to the Belt Number (Example A80 = 82 Outside Circumference) L style belts are often designated as light duty industrial, or lawn & garden. Basic HVAC Tutorial. Too little tension results in slippage, causing premature belt & pulley wear. There are often problems using notched belts in moveable sidesheaves. The information below will not return an exact measurement as implied by the belt part number. (Example 4L320 = 30 Inch Inside Circumference) (Example 5L380 = 35 Inch Inside Circumference). Lets begin this section asking the question Can belts stretch? Never substitute or mix these belts. 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. Some examples follow: Use onlyFHP belts in die cast sheaves. Theyre sometimes referred to as Conventional belts. 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. 5V & 5VX Belts = The Outside Circumference (OC) Minus 4 Inches. The prefix offers dimensional standards, and somewhat defines the purpose of the belt. %%EOF 3V, 5V, 8V, AVX, BVX, CVX, DVX IMPORTANT: Dont Confuse V In The Part Number Prefix! The standards for some belt part numbers reflect the Outside Circumference (OC) of the belt, and others the Inside Circumference (IC). (Example 3L250 = 24 Inch Outside Circumference) * The v-Belt HP ratings are supplied as illustrations. I recommend you follow this link and print as a reference guide. Always consult an owners guide for the proper tension range. I could take the time to better explain, but instead will defer to a brief instructional video embedded below. Ill do my best to narrow them to what youre most likely to encounter in the HVAC Industry. All Rights Reserved | Designed by. Thats what makes your belt appear to have stretched.. (Example 3V250 = 24 Inch Inside Circumference) D & DX Belts = Add 5 Inches to the Belt Number (Example D80 = 85 Outside Circumference) ** When upgrading to classical or notched belts, check to make sure the sheaves youare using are appropriate for the higher HP belts. 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. Using a 4L or 5L belt in an A or B application will result in reduced performance and belt life. 770 0 obj <>stream hOHTQ}Qt7fn!iZihcum, You can also use AX or BX notched style v-belts. C & CX Belts =7/8 (.875) Inches Width x 17/32 (.53125) Height The more you tension a belt, the faster it will wear out. 25 (Inch Outside Circumference) divided by 3.14 (PI) = 7.962 (Inch Outside Diameter). Too much tension results in excessive stress on belts, bearings, and (motor & fan) shafts. V and VX belts are specifically designed for higher horsepower and longer center distance applications. The V designation in the prefix is a difference in the profile of the belt. 65 0 obj <> endobj According to the website BeltsForAnything.com, Belts dont actually stretch in length, the sidewalls wear from pulling, and your belt gets narrower. Until I began to specify belts for HVAC Accessory fans and motors, I thought a belt was just a belt. 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. The 5L and the B Section belt will both fit in the same sheave, but they provide dramatically different horsepower capacities. FHP belts are typically for low horsepower applications whereas B Section classical belts are for medium horsepower applications. 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. Smaller diameter pulleys offer less stress on X style belts due to the notched under-bottom. Therefore the measurements between the old and new may not be exact. ** When upgrading to classical or notched belts, check to make sure the sheaves youare using are appropriate for the higher HP belts. Conventional Belts Part Numbers Reflect Inside Circumference (IC) Measurements in Inches.

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