How To Size A Capacitor For A Compressor

Electric Motor Starting Capacitor Selection
Selection Guide to A/C Compressor & Other Electrical Motor Kickoff-Boost Capacitors

• POST a QUESTION or COMMENT about installing a hard-start capacitor to get an air conditioner motor, fan motor, or other electric motor running.

InspectAPedia tolerates no conflicts of involvement. Nosotros have no human relationship with advertisers, products, or services discussed at this website.

Electric motor showtime-run capacitor pick guide:

This article explains how to select an electric motor commencement capacitor, difficult start capacitor, or run capacitor that is properly rated for and matches the requirements of the electrical motor such as an AC compressor motor or fan motor where the capacitor is to exist installed.

This electric motor capacitor article series explains the pick, installation, testing, & use of electric motor starter outset and run capacitors used on various electric motors found in or at buildings such as air conditioner compressors, fan motors, some well pumps and some heating equipment.

These electric motors utilise a capacitor to get-go and run the motor efficiently. Nosotros also explicate the choice & wiring procedures for a hard kickoff capacitor designed to get a difficult-starting air conditioner compressor motor, fan motor, fridge, or freezer compressor or other electric motor (such as a well pump) going.

We also provide an Commodity Index for this topic, or you can endeavour the page peak or bottom SEARCH BOX as a quick mode to observe information you lot need.

How to Diagnose, Choose, & Replace Motor Capacitors

Watch out: do not effort electrical repairs if you are non trained and equipped to do so. Making a mistake can cause a fire or serious injury or death.

Article Contents

• TABLES of Common MOTOR SIZE & CAPACITOR VALUES - shown above/left
• DIAGNOSIS: DOES MY MOTOR NEED A NEW CAPACITOR?
• HOW TO Choose A CAPACITOR FROM MOTOR DATA - 4 ways
• Explicate CAPACITOR RATINGS
• EXPLAIN CAPACITOR WORKING Course & LIFE EXPECTANCY
• CAPACITOR CODE & MARKING DECODING GUIDE
• CAPACITOR CATALOGS & SOURCES
• HOW TO LOCATE the MOTOR CAPACITOR - separate commodity

Definition of capacitance or capacitor

Capacitance is the ability of a device to store an electric charge.

An electric motor capacitor is a device that start stores, and then releases an electrical charge to aid start an electrical motor (starting capacitor) or to keep information technology spinning (run capacitor) - the electrical charge or potential free energy stored in the capacitor is used to give a ability heave to the motor to assist information technology overcome inertia - to start rotating.

The college a capacitance or µF, the greater the total voltage charge that will exist accumulated then released by the capacitor to give the motor a "kick" to start information technology rotating.

Types of Motor Capacitors

Before trying to replace a capacitor, you lot should know that some motors utilize a combined outset/run capacitor and others don't apply a start or run capacitor at all.

Individual Starting time & Run Capacitors

A start capacitor is used to give the motor a kick to become information technology moving and a split up run capacitor keeps it spinning smoothly.

Combined beginning/run capacitor

A start/run capacitor combines the start capacitor and run capacitor functions in a single device. These caps will have three electric terminals:

South = start wire connector

R = Run wire connector

C = mutual connector

So if your electric motor has only one physical capacitor, it might be a model that combines both get-go and run features. You can tell this by examining the terminals marked on the capacitor. It will have both S and R equally well equally a C terminal.

Dual capacitor

A dual capacitor - combines two physical capacitors within of a unmarried concrete device, one to run a higher-amperage motor such equally the compressor in an air conditioner compressor/condenser unit of measurement, and a second smaller capacitor to run a smaller motor such as the cooling fan motor in the compressor/condenser unit of measurement.

Where is the capacitor?

If you tin't find the capacitor,

see LOCATE the STARTING CAPACITOR,

Some motors don't use capacitors or use but a run capacitor

Lookout out: not all electric motors, such as pool pumps, use starting or run capacitors.

For example a split up-stage motor, frequently used in spas and hot tubs and at many above-footing swimming pools, uses a start switch and starts winding but does not use a starting nor a run capacitor.

A "permanent separate capacitor" motor uses a run capacitor simply not a starting capacitor. Motors of this design, often found in in-ground swimming pool pumps, have a low starting torque and need just a run cap.

ECM motors use an electronic control module to operate the motor and may not use a start or run capacitor. Those motors are described

at ECM MOTOR CAUSING CIRCUIT BREAKER Fizz

How practice y'all know that an electric motor needs a replacement STARTING or RUN capacitor?

There are 3 bad capacitor cases.

1. Bad start capacitor
2. Bad run capacitor
3. Visible damage to either type of capacitor, for example: bulged.

1. Bad Starting time Capacitor

If the electric motor hums without starting or has trouble starting, but volition run if given a push (e.chiliad. a spin of a fan blade - watch out for chopped-off fingers) the Starting time cap is probably bad.

If the motor hums and does not commencement to rotate and the thermal overload protection switch has not tripped, then the Beginning cap is probably bad.

2. Bad Run Capacitor

If the electric motor draws high current when running, the RUN cap may exist bad. In that location are other causes such as bad motor bearing or overloaded motor.

In sum a failing motor may be hard to start, merely because changing the cap is so cheap compared with replacing the motor, often the tech will try a new showtime cap start to come across if she tin get more life out of the motor before replacing it. See details at HARD STARTING ELECTRIC MOTOR CAUSES

See also CAPACITORS for HARD STARTING MOTORS

Watch out: If EITHER the STARTING capacitor or RUN capacitor is bulged, burned, has a hole in it, or has leaked oil, it is shot and needs replacement.

[Click to enlarge any image]

3. Damaged Capacitor Examples

Outburst or Diddled capacitor:

A "catastrophic capacitor failure" of a motor starting capacitor is 1 in which the start capacitor literally "explodes" or bursts.

This happens when the start capacitor remained engaged too long - peradventure because a centrifugal switch inside the motor did not undo the starting cap circuit when it should have.

Details are at Electric MOTOR CENTRIFUGAL SWITCH or PTC PRD

Spotter out: Exposing a capacitor to voltage much above its rated voltage input might besides cause a capacitor to explode.

Blistered or Bulged capacitor:

This capacitor failure is similar to but non as dramatic as a blown capacitor but here too, if you see a bulge or blister or rupture or burst opening on your capacitor, the cap has failed and needs to exist replaced.

Subconscious internal harm:

of a starting capacitor is shown as lost capacitance that can occur due simply to crumbling or "wear" from long service. An electrical test of the capacitor can reveal this failure.

Details of how to test the capacitor itself are constitute

at TEST a MOTOR START or RUN CAPACITOR

How to Choose a Replacement Motor Capacitor - 4 Methods

The all-time pick if you are replacing a starting capacitor or a showtime/run capacitor is to lucifer the existing device on your system.

That means noting the information printed on the existing capacitor - if it'south legible and matching that.

Our capacitor tables given above in this article also provide general communication on matching a motor capacitor to the motor voltage and size ratings in Volts and kW or kilowatts.

[Click to enlarge whatever epitome]

Our photograph here illustrates a Mars-brand starting capacitor rated at 25uF and 370VAC - this cap is used ion AO Smith motors and is identified as 25MFD 370V - 628318-307. (MFD = microfarads)

Since in that location are just two terminals we know this isn't a start+run capacitor.

How to Match a Replacement Capacitor for an Electric Motor

Options for matching a replacement motor capacitor include the following

1. Examine the original capacitor and lucifer its ratings in Voltage and and capacitance, uF or micro farads.

   Look for and record all of the markings on the capacitor.

   Typically you'll encounter a rating in microfarads similar the 25uF in our capacitor photo above, and yous'll as well see a voltage range rating such as the 370VAC (maximum voltage) rating besides in the red circumvolve of our photograph above.

   For help decoding the markings on your capacitor, see

   CAPACITOR CODE & MARKING DECODING GUIDE

2. Take the capacitor or the whole electrical motor to a motor rebuild-shop or to your local electrical supplier

   If the capacitor markings are legible, they'll be able to friction match it.

   If the capacitor markings are not legible the electrical supplier or motor rebuilder will recommend a start, run, or combination capacitor based on the motor data tag information.

What if the Capacitor is Lost or Has No Legible Markings?

With the motor brand and model (and hopefully series number in hand) you can besides get the exact OEM part number - contact the motor manufacturer. They can give you the verbal OEM capacitor replacement role number or specifications.

3. Check the motor type & motor part number and information tag specifications and use a motor function exchange or OEM role catalog.

   Come across capacitor and motor repair role catalogs given

   at ELECTRIC MOTOR CAPACITOR CATALOGS

   For readers whose capacitor has no markings whatsoever, your electrical supplier volition desire to know the technical details almost the capacitor'due south intended employ. Those tin be found on the motor data tags for the motor served by the cap.

   Typical pool/spa motor capacitors: some pool pumps use a motor that gets a kickoff-upwardly boost from a starting capacitor.

   For case a typical aboveground puddle, hot tub or spa motor will use a

   starting capacitor rated around 50-400 MFD and 125 or 250 VAC.

   And for the same motor, the run capacitor will be rated around 15-50 MFD and 370 VAC.

   Capacitor Capacitance Value Limits - MicroFarads

   Select a replacement capacitor whose capacitance value in µF, (micro-farads) typically expressed as a range such as thirty µF - 50 µF matches the original capacitor and/or the data tag on your electric motor.

   Capacitor Voltage Rating Selection Limits

   The voltage rating of a capacitor indicates the highest nominal voltage at which it is designed to operate.

   Use of a capacitor at voltages

   below

   its rating will do no harm. For example, if your motor used a 370VAC rated capacitor you tin can supersede it with a 370 or a 440VAC capacitor. The 440VAC capacitor will last longer.

   But because these voltage ratings are simply the pinnacle voltage that the capacitor can handle, using a higher-rated cap (440) where a lower-rated one (370) was originally installed, is non harmful.

   Run capacitors must not exist subject to voltages exceeding 10 pct of the nominal rating, and start capacitors must not be subjected to voltages exceeding 30 percent of the nominal rating.

   Watch out: The voltage to which a capacitor is subjected is not line voltage, but is a much higher potential (often called back electromotive strength or dorsum EMF) which is generated in the showtime winding. On a typical 230 volt motor, the generated voltage may exist as high as 400 volts and is adamant by the start winding characteristics, the compressor speed, and the practical voltage.

   COPELAND Electrical HANDBOOK

   [PDF] p. A-nine

4. Choose a capacitor based on Electric Motor Type, Motor Horsepower, Motor Kw or Kilowatt rating, or Frequency (Hz)Near capacitors will be rated and marked as 50/sixty Hz significant that the capacitor can run at either Hz or frequency. Just do not utilize a cap marked ONLY as a 50Hz on a 60Hz circuit and vice versa.

   If you cannot detect whatever data giving the motor'southward make, model, specifications, and you lot have no markings nor even the actual old start/run capacitor from an electrical motor, yous might get into the correct ballpark by choosing a capacitor based on the motor's horsepower and voltage and awarding.

   If you lot don't even have that information, we're stuck. Take the motor to an electrical motor repair proficient who might find markings y'all missed.

What if the Motor has No Data Tag? Ballpark Kickoff-Run Capacitor Values

If the motor has no legible markings nor data tag, first check again. Some electric motors such equally oil burner motors accept data stamped right into the metal casing of the motor itself. The information may exist there only only visible under good lighting.

In general, starting capacitors for electrical motors will exist in the range of 50 - 1200 µF and will be rated for voltages of 110/125, 165, 220/250 or 330 VAC and will exist labeled as functioning at 50Hz or 60Hz.

Near capacitors use a 1/4" apartment bladed push button-terminal connector with ii terminals per post.

Run capacitors may take 3-4 terminals per post.

While most starting capacitors article of clothing a round case, some are oval in design: the shape does not impact the capacitor'south function but the capacitor's shape might bear upon its power to fit into the original capacitor's location or case on your equipment or motor.

Watch out: as a general rule of pollex, electric motor first capacitors tin be replaced with a micro-farad or µF or mfd rating equal to or up to twenty% higher µF than the original capacitor serving the motor. On the replacement capacitor the voltage rating must be equal to or greater than the original.

Watch out: exercise not affect an electric motor capacitor nor any other electrical components before yous have removed electric ability and SAFELY discharged the capacitor or you lot tin can go a serious stupor or injury.

If your electric motor truly has no legible information nigh its specifications and so you lot might consider these very basic capacitor ranges that tin get a small electric motor running again:

Small-scale Motor Capacitor "Ballpark" Sizes Based on Motor Blazon
Motor Blazon 1	Start Capacitor uF / Voltage 1	Run Capacitor 1
Air conditioner compressor motor	30 µF 3 - 50 µF / 370 VAC [citation & information needed]	v µF 3 - seven.5 µF
Oil burner motor 1/7 - one/2 hp 5	xx µF / 370 VAC if used	5 µF if used
Puddle Pump motor	50-400 µF / 120 / 250 VAC	15-50 µF / 370 VAC (we think this is high - Ed.)
Tabular array saw motor 1 - one.5 HP	160-200 µF / 120 / 250 VAC to 300 µF / 110-125 VAC	30 µF / 370 VAC
Well pump motor one/2-3/4	lx-seventy µF / 220VAC
Well pump motor 2 to 3 HP	105-126 µF / 220VAC 4 to 160-200 µF / 220VAC
Eatery food or baking mixer motor 6	150-200 µF fifty/60Hz 110VAC
Sewage Grinder Pump / Macerator motor 7	Start Cap Rating 233-280 MFD, 220V	Run Cap Rating 15 MFD, 370V

...

Small Motor Capacitor "Ballpark" Sizes Based on Motor Horsepower
Motor Horsepower 2	Start Capacitor µF / Voltage	Run Capacitor
1/8 Hp or 0.i KW, 120-150 VAC two	100-130 µF	4 to 5 µF 370VAC
1/ii Hp or 0.37 KW, 120-150 VAC	320-400 µF	10 µF 370VAC
ane Hp or 0.75 KW, 120-150 VAC	500-580 µF	10-15 µF 370VAC
ii Hp or 1.5 KW, 200-250VAC	500-580 µF	10-15 µF 370VAC
3 Hp or 2.25 KW, 200-250VAC	500-580 µF	twenty-25 µF 370VAC
v Hp or 3.75 KW, 200-250VAC	750 µF	xxx µF - 40 µF 370VAC

Notes to the tables to a higher place

1. Watch out: these are only "ballpark guesstimates" - check with the manufacturer of your specific motor and application.

For case among the motor type "pool pump" horsepower range may mean different capacitor values.

If your capacitors burn out chop-chop at that place are several common reasons: wrong capacitor size (besides small), motor is damaged, or mis-wiring.

three. Typical replacement sold for a Goodman brand air conditioner at online parts suppliers - Ed.

4. Typical replacement sold at WalMart June 2018

Watch out: Walmart capacitor prices on 2018/06/thirty were observed to be up to ten times or more higher than other vendors of the same or equivalent parts. Check also with your local electric supplier.

5. Picket out: not all motors use beginning, run, or combination capacitors, and some motors such as those sporting a switchless motor or "PSC" (Permanent Split-Capacitor) motor requires a run capacitor that improves motor efficiency and stays in-circuit when the motor is starting or running.

6. Hobart commercial restaurant mixer motor starting capacitor, sold past Heritageparts.com

7. Using the Hydromatic single stage capacitor pack for single phase pumps such as from Pentair® or Hydromatic® provided by R.C. Worst & Co., rcworst.com included these submersible sewage grinder pumps: S3HRC300M7-two HPGH/F300M7-2 HPGHF/H300M7-2 HPGH/FX300BD HPGH/FHX300BD

Capacitor Ratings in Farads or micro-Farads µF and Voltage VAC

Capacitor energy ratings are expressed in farads - the amount of electric power stored in the capacitor, where µF or µF = microfarad (x^{-half dozen} farads) and is the same as mfd (microfarads) written in other references.

Rated capacitance for a capacitor is the capacitance value (electrical energy storage value) for which the capacitor is designed.

The rated capacitance has to exist sufficient to requite the energy heave or kick to the electric motor to start information technology spinning (a start capacitor) or to help continue information technology spinning (run capacitor).

Capacitors are also rated for the voltage range in which the capacitor tin safely operate, such equally 220V or 440V.

The starting capacitor photo shown here, provided 2018-07-10 past reader Robert, is marked as rated 35 +5 uF 440V 60Hz.

That's 35 microfarads +5% and is the capacitor rating, along with voltage, that the reader will need to specify when buying a replacement.

We likewise see a specific part number: SH 8720 1238 80-197, only in replacing this capacitor you'd nourish first to the rated capacitance and voltage.

[Click to enlarge any paradigm]

Rated voltage for a capacitor is defined as the highest continuous voltage that can be applied to the capacitor at its rated temperature without impairment.

Depending on the application, the micro-farad range of starting capacitors varies according to the motor size. For case you can't sub a 110V-rated capacitor into a 220V arrangement.

Start capacitors typically range from 20-30 µF up to 250-300 µF. The example capacitor charts at the commencement of this article are adjusted from AFCAP. [2]

The voltage range for a first-up capacitor typically ranges from 250VAC to 450VAC.

Watch out: When you are replacing an electric motor capacitor, never put in a lower rated capacitor. If you cannot go an exact size match to the original motor capacitor, it is acceptable to use a capacitor rated i step college in µF. The substitute capacitor must be able to handle the voltage.

Run capacitors typically range in micro-farads from 1.5 to 50µF. or 50 microfarads or MFDs.

Robert'southward run capacitor shown here is rated at 7.5 µF +/- 5%, 370 Volts, and 50/60Hz or cycles.

The cap also sports its part number.

You can also check a capacitor to compare its functioning with its microfarad rating past using an ohmmeter. In a working capacitor, ohms volition build-up and and so fall off (when the capacitor discharges).

Details of that procedure are

at Exam a MOTOR START or RUN CAPACITOR

HVAC suppliers sell general-use starting capacitors that are intended for use across a range of electrical motors and motor sizes.

But at to the lowest degree some industry sources (Sealed Unit of measurement Parts Company or Supco) make a more than conscientious statement explaining that it'due south all-time not to install a significantly oversized starting capacitor on an electric motor.

According to Supco, [quoting]

If the outset capacitor is too large for the awarding, the capacitor can actually mask the adult voltage in the start windings and keep the start capacitor in the circuit continuously. .... The ... run-start voltage is suppressed below the trigger voltage of the start device. Equally a result, the beginning capacitor remains in the circuit as the motor runs.

A secondary, fail-safe method is necessary to ensure that the start device is ultimately removed from the circuit.

... A outset device that fails to remove the outset capacitor from the excursion has the potential to cause premature failure of the beginning windings in the compressor. ... If the capacitor is never removed from the showtime windings, premature winding failure could occur. Every bit such, care should be taken when selecting capacitor sizes for an application.

Care should too be taken regarding products that tout a "bigger capacitor is ameliorate" approach to compressor starting. SUPCO Due east-Class devices provide a secondary timing safety device to ensure that the start capacitor is dropped from the excursion in a neglect-condom mode.

Complete Guide to Capacitor Markings

This topic has moved to

CAPACITOR CODE & MARKING DECODING GUIDE

Electrical Motor Capacitor Working Class

This topic has moved to

Explain CAPACITOR WORKING Class & LIFE EXPECTANCY

Start & Run & Dual Capacitor Guidebooks, Catalogs, Cross-References, Sources, Specifications

• AO Smith Electric Motors, CENTURY Puddle & SPA MOTOR Manual [PDF] AO Smith Electric Products Co., 531 Northward Fourth Street, Tipp Metropolis, OH 45371 USA Website: world wide web.aosmithmotors.com (937) 667-2431 - includes troubleshooting, repair, replacement, capacitor testing
• AO Smith ELECTRIC MOTORS for the Farm [PDF] Op. Cit.
• Century Electrical Motors (Previously A.O. Smith Electrical Motors), CENTURY POOL & SPA MOTORS REPLACEMENT PARTS & MOTOR CROSS REFERENCE MANUAL (2012) Distribution Marketing 1325 Heil Quaker Blvd. LaVergne, TN 37086 PH: 866-887-5216 FAX: 800-468-2062 centuryelectricmotor.com
• Century Electrical Motors (Previously A.O. Smith Electric Motors), SINGLE & THREE Phase INTEGRAL HORSEPOWER MOTORS [PDF] (2013)
• Century Electric Motors (Previously A.O. Smith Electrical Motors), V-Light-green 165 VARIABLE SPEED ELECTRIC MOTOR MANUAL [PDF]
• Conis Elco Ltd., CAPACITORS for MOTOR APPLICATIONS, [PDF], Website: http://world wide web.conis-bg.com/EN/, retrieved 2018/06/18, original source: http://www.elcomp.cyberspace/conis.pdf
• COPELAND Electric HANDBOOK [PDF], Emerson Climate Technologies, White-Rodgers U.s. 8100 W Florissant Artery Saint Louis MO 63136 USA, Customer Support: email: wr.techsupport@emerson.com, Tel: 1-888-725-9797 U.S. & Canada
• Eg. Copeland Stoelting 231047 run capacitor shown here for use in a Copeland make HVACR compressor motor system.
• Eaton, Power FACTOR CORRECTION: A guide for the plant engineer [PDF] (2004) Technical Information SA02607001E, Capacitor banks and passive harmonic filters, Eaton 1000 Eaton Boulevard Cleveland, OH 44122 United States Eaton.com retrieved 2019/ten/08, original source https://www.eaton.com/ecm/groups/public/%40pub/%40electrical/documents/content/sa02607001e.pdf
• Essex, Dark-brown: "Motor Repair Supplies" (Catalog), Essex Grouping, Inc., 1601 Wall St., Fort Wayne, Indiana 46801, Tel: 219-461-4633, Website: www.superioressex.com, retrieved 6/twenty/xiv, original source: http://www.essexbrownell.com/uploadedFiles/Content/Products/MR%20Supplies%20Catalog-southward.pdf - meet pp. 86-89.
• Galco SIZING LOW VOLTAGE CAPACITORS at MOTOR LOAD [PDF] Galco Industrial Electronics, 26010 Pinehurst Madison Heights, MI 48071 The states Website: world wide web.galco.com, Tel: 800-575-5562, 800-521-1615 or Emergency Service: 888-988-8086 retrieved 2019/10/08 original source: https://www.galco.com/techdoc/abbc/c485g30-u_cp.pdf
  Excerpt:

  A capacitor is properly sized when its full load current rating is 90% of the no-load current of the motor. This ninety% rating avoids over correction and the accompanying problems such as over voltages.

• Kaiser, Cletus J., The Capacitor Handbook: A Comprehensive Guide For Right Component Selection In All Circuit Applications. Know What To Apply When And Where, 2nd Ed., [at Amazon.com] C.J. Publishing (2011), ISBN-10: 0962852538, ISBN-xiii: 978-0962852534 - product description

  This book provides practical guidance and awarding information when using capacitors in electronics and electric circuit design. This easy-to-use book covers the following capacitor types: Ceramic, Plastic Film, Aluminum Electrolytic, Tantalum, Drinking glass, Mica, and others.

  This volume also has a very comprehensive Glossary and Index. The Selection Guidelines and the Symbols and Equations sections have the answers to all of your daily application questions. This book is one in a serial of component handbooks.

• Kemet CAPACITORS for A.C. MOTOR APPLICATIONS [PDF] Kemet Electronics Corporation, ane East Broward Blvd., Fort Lauderdale, FL 33301 USA, Tel: (954) 766-2800 Email: info@kemet.com retrieved 2019/10/08 original source: http://world wide web.kemet.com/Lists/ProductCatalog/Attachments/158/F9000_GenInfo_MotorCaps.pdf
• Kemet CAPACITOR CATALOG [PDF] (2015) KEMET Corporation 2835 KEMET Way Simpsonville, SC 29681 USA 864.963.6300 www.kemet.com retrieved 2019/10/08 original source https://www.avnet.com/

  Over 300 pages, although titled a "Capacitor Choice Guide" this is a catalog and not an explanation of how to choose the correct capacitor for your application.

• MOTOR START and RUN CAPACITORS [PDF] AFCAP (African Capacitors Express), Metallized polypropylene film capacitors for motor running applications web search 08/05/2011, original source: http: //world wide web.afcap.co.za /manual/Part2.pdf; 2018/07/11 update: the original source link is no longer valid - Ed.
• Packard 370V 45+5 MFD Round Run Capacitor
• Reco Bulgaria Capacitors, GENERAL MOTOR CAPACITOR INFORMATION [PDF] Reco Bulgaria, 1574 Sofia / Bulgaria, 65/three, Shipchensky Prohod, Bulgaria, Tel.: + 359 2 870 twenty 81, Electronic mail: info@reco-bg.com Web: world wide web.reco-bg.com retrieved 2021/ten/15 original source: http://www.reco-bg.com/motor.pdf

  Excerpt: Reco Republic of bulgaria Ltd. is specialized in import/export of wide range of electronic components, modules and devices. Capacitors, filters, integrated circuits and printed-excursion-boards (PCB) are our main products.

• SUPCO Sealed Unit of measurement Parts Co., Inc., PO Box 21, 2230 Landmark Identify, Allenwood NJ 08720, U.s., Tel: 732-223-6644, Website: www.supco.com, Email: info@supco.com, Website: http://www.supco.com/ , Supco Itemize, retrieved 6/20/fourteen, original source: http://www.economicelectricmotors.com/cdrom/catalogs/Supco_catalog.pdf - come across pp. 2-vi.

  Supco provided the compressor starting capacitor and packaging information (purchased by the author from an air conditioning parts supplier in New York)

  "The Due east Class Advantage", Supco (op cit), describes the company's advanced kickoff/run capacitor products. Web search 08/04/2011, original source: http://world wide web.supco.com/eclassadvantage.htm Quoting from that article:

  The SUPCO Eastward-Class Series contain the almost advanced developments in start device applied science:

  1. Voltage sensing technology that monitors for motor start (current sensing devices require internal fuse protection).

  2. A 2-wire connection that simplifies installation

  3. A secondary timing circuit that ensures that the capacitor is not permanently left in the start winding circuit

  4. A fully electronic device - minimizing the limitations of mechanical devices and secondary fusing associated with triac devices

  v. A start device matched with an appropriately sized capacitor to cover the range of compressors for the intended application (ane size does not fit all)

  The employ of compressor start devices results from a need to ensure that a compressor (usually air conditioning) volition start nether voltage conditions that are less than platonic.

  Spotter out: Care should exist taken to utilize a device that meets the requirements of the job.

  Extra caution should be observed when employing the "ane-size-fits-all" and "a bigger capacitor is better" approach to applying a start device.

  • Supco™ 30+5 MFD 440V 440 Volt 50/lx Hz Round Motor Capacitor (typical awarding for Amana, Carrier, Rheem, Trane equipment)
  • Supco™ 45+v MFD 440V 440 Vol 50/60 Hz Round Motor Capacitor (typical awarding for Amana, Carrier, Rheem, Trane equipment)
  • Supco HS6 (SPP6) Difficult Get-go Relay Capacitor (230V) gives a starting torque heave of up to 500%. Quoting from product sales literature:

    The SUPCO SPP6 Super Boost hard offset capacitor increases starting torque upwardly to 500%. Features: Installs in seconds beyond run capacitor terminals. Contains specially designed relay and large kickoff capacitor for severe hard commencement problems.

    Applications: Room A/C units, Residential and commercial PSC A/C units and heat pumps, and all PSC A/C units from 4,000 thru 120,000 BTU's (i/ii thru 10 H.P). Can be used on 120 thru 288 VAC units, and severe depression voltage and hard starting compressors.

    SPP6 Specifications: Voltage: 115V - 230V. Increased Torque: 390 ounce inches. - retrieved half-dozen/16/14 Amazon.com sales

  • Supco™ Universal (broad application) Capacitor, ten MFD at 370V
• Temco Kickoff CAPACITOR Pick GUIDE [PDF] Temco Industrial, Tel: 877-474-8209, Website: world wide web.temcoindustrial.com retrieved 2019/10/08 original source: https://temcoindustrial.com/product-guides/capacitors/outset-capacitors
• van Roon, Tony, "Capacitors", [online article], retrieved 6/20/14, original source: http://www.sentex.ca/~mec1995/gadgets/caps/caps.html, gives a very detailed history of the invention and history of electrical capacitors beginning with van Musschenbroek's Leyden jar in 1745. This article includes "Capacitor Nomenclature" by Dean Huster.
• Visay, Low VOLTAGE POWER CAPACITORS CAPACITOR Selection TABLES [PDF] Vishay Corp., Company address: not provided at their website; Website: http://www.vishay.com retrieved 2019/ten/08 original source: http://www.vishay.com/docs/13003/calcandtables-esta-lvpc.pdf

Reader Q&A - also see the FAQs serial linked-to below

@Adam,

Sure, merely have a wait at the capacitor selection guide above and you lot'll see that in that location are several ways that y'all can make a reasonable guess at what capacitor you need. You'll too see that you can apply a close match; it doesn't accept to exist an exact match.

Having difficulty finding this capacitor for my old motorcar elevator it is a 2 mail service screw lift rated at 6,000 LBS has somewhere between a i/2hp to a 2or 3 HP motor a chain runs underneath that keeps the two posts in sync runs on 240v one phase. Can anyone help

@Aiman,

Wait at the specifications on the motor information tag.

Some capacitors combined starting time and run in i concrete device. Look at the terminals.

3hp sgle capacitor

I want to know uf for my air compressor please assist me.

@Steven,

In full general,

1 bhp or horsepower = one.341 kw.

one/9 hp x 1.341 = most 0.150 kw
Or virtually 150 watts

Hello i saw in the spider web site that my fridge compressor is 1/9hp but in ur chart is in kw..how practise i know the right cap based on ur listing u have given?

@Ilias

We accept added several tables and notes detailing pretty-much all of the codes and markings found on capacitors - now in the article above. Thank you for asking.

You lot may need to clear your browser cache to come across the updated page.

Re-posting without link - for reader security

ILIAS BURKETT · 5 hours ago
I am just kickoff to learn about Refegerators/Freezers. There seems to be some Markings/Numbers on the start Capacitors other than Capacitance(uF), &, Voltage. For example, there are some numbers similar this "25/70/21 PO". I am not sure what these numbers hateful? Likewise, some Capacitors take more than one Voltage ratings(h/cl.b & h/cl.c). As an example, hither is a link for a showtime Capacitor listed on ebay;

@Mac,

Above on this very page you'll find tables and suggestions for sizing motor capacitors based on motor size (1/5hp in your case) and type. Delight take a await and allow me know if that leaves y'all with questions.

I accept a air handler fan motor that is needing a new capacitor. The markings are not legible for mf. The motor size is 1/5 hp. Any help is appreciated.

@Peter,

I think at this betoken our best bet is to take a guess using the capacitor size tabular array versus motor horsepower given in the article above.

I've an old Crompton Parkinson motor on an air compressor and the capacitor seems to accept packed it in. I've attached a photo of it but equally you can see the specs are unreadable. Looks similar it has a max of 150 F? The specs on the motor are Model PA9342Q-P-M running at 50Hz ane.5HP Class E Amps seven.eight nine.0 240v. Could you propose delight? Peter

@david carson,

Our electrical motor starting capactor sizing tables don't address much higher horsepower motors similar your 20HP motor;

First, are you sure that your motor uses a starting cap?

2nd: have you checked the specifications on the motor's data tag or in its IO transmission?

Alternatively sciencing.com offers this formula that nosotros've not confirmed

"Multiply 0.5 times the square of the voltage. Call this result "ten.". Standing the case, you have 0.five times 11.5 volts times 11.5 volts, or 66.1 square volts for "x". Divide the start-up energy requirement, in joules, of the motor past "10" to arrive at the capacitor size needed in farads."

I have a twenty horse motor what starting capacitor did I need and how much

@Margot D,

From the commodity above nosotros accept this note:

Equally a general rule of thumb, electric motor start capacitors can be replaced with a micro-farad or µF or mfd rating equal to or upwards to 20% higher µF than the original capacitor serving the motor. On the replacement capacitor the voltage rating must be equal to or greater than the original.

That'south about a x uf departure from the high-finish of your stock motor cap, so you could try a capacitor that puts out up to 62 uf 250VAC

For case this capacitor (shown below) sold past grainger.com is described as

DAYTON 2MEL2 Circular Motor Start Capacitor,53-64 Microfarad Rating, 330VAC Voltage

Also check out the caption of capacitor voltage likewise discussed in the commodity above. You should agree that the 330V is simply an upper limit.

Alternate size kickoff capacitor for roof height Air-conditioning fan motor?

Hi, I currently take a 43-52 microfarad 250 VAC outset capacitor that I need to supplant (AC starts and gets cold but fan does not turn on). This type of capacitor is sold out everywhere (or long atomic number 82 times). What other size capacitor tin I look for to start a 1/5 HP, 1650 RPM, 3 speed, 115 Volt, two.5 Amp fan motor(Century ORV4540)?

Thanks! Margot

On 2021-07-07 by (modernistic) - How does the start capacitor get turned off when the motor has reached its rated speed?

@How start capacitor working,

Thanks for your helpful question that I'd re-phrase as

How does the start capacitor go turned off when the motor has reached its rated speed?

Respond:
On many motors a centrifugal switch congenital into the motor and held closed by springs keeps the commencement capacitor in the motor power circuit until the motor has reached its rated speed.

At that signal the rotating speed of the motor is sufficient to open the centrifugal switch against its spring pressure, thus taking the starting capacitor out of the circuit, leaving the run capacitor in apply.

To give you an idea what the centrifugal switch looks-like, below nosotros evidence a Speedaire (brand) Centrifugal Switch Set Mfr #: PN22N031G as listed for sale at Zoro.com, Zoro #: G8641053

How difer start capacitor off state after motor in rated speed

@inspectapedia.com.moderator, Cheers for the quick reply. I'll try my luck with RUUD Service first.
;)

@Thomas,

To select a start/run capacitor for an erstwhile AC unit when the values of the original capacitor are non legible,

A service tech might utilise the capacitor choice rough guidelines similar those above on this page, or

consult the service manual for the compressor/condenser unit that may give the exact OEM specification, or

she might give Ruud service a call - for which i needs just what y'all have on that service tag: the Ruud A/C model no. UND-030JBZ
and they may want its serial number

Hullo experts!

I'm looking for a dual capacitor replacement for an former RUUD AC compressor model UAND-030-JBZ, the serial number start with 7259.
The capacitor'due south housing is in plastic and the specs (etched) disappeared over fourth dimension, so I have no idea which capacitor I should order.
:(

I'1000 attaching an image of the compressor's specs if information technology helps.

Thank you for your help!

@Ted Chase,

Please check the motor capacitor size full general guidelines and tables in the article above.

A 0.74 Amp electric motor, 120V, unmarried stage, with a typical power gene of 0.9 is microscopic: its horsepower calculates (using a typical online amps to horsepower calculator) to near 0.096 hp - or most a one/x HP motor.

What size capacitor is required to run a 115VAC, .74amp motor

@Tim,

Your photo was a flake blurry so I tin can't come across whether it has two terminals or three.

I mention this because if in that location were three terminals than the capacitor would be a dual role get-go and run cap.

I can tell you that depending on the size of your motor, the 30 microfarad rating that shows in your photograph might be used in a starting cap - for instance on an air conditioner motor or on a pump.

Run capacitors for such motors generally would use a smaller number every bit you'll come across in the capacitor selection tables above.

I have a 1.v hp jacuzzi hot tub pump. The motor hums just wont start. I check the shaft and that spins freely. I'chiliad guessing capacitor. Information technology simply has one and its located on height of the meter. Is that a start capacitor or run.

@nkatu30, I don't have an authoritative answer

but it seems to me that as the motor'southward basic mass and windings oasis't inverse you'd need the aforementioned sized cap; typically in motor capacitor specifications the voltage range given is a condom upper limit and it's ok to utilize, for instance, an XXufd starter cap or run cap rated for 380V on a 240V application.

Shown is a Round Motor Run Capacitor,30 Microfarad Rating, 370-440VAC Voltage from Titan

I want to catechumen a iii stage (380V) compressor motor into single phase (240V).
What is the correct capacitor size to utilize?

@Tom,
We do not sell annihilation. No products, no services. And no motor start capacitors.

Just you tin find your capacitor very hands at your local electrical supplier, at some building suppliers and at a stunning number of online vendors, starting peradventure with grainger.com or amazon. An instance is below.

InspectAPedia.com provides building and ecology diagnostic and repair information.

In order to absolutely assure our readers that nosotros write and report without bias we practise not sell any products nor do we have any business or fiscal relationships that could create such conflicts of interest.

InspectAPedia is an contained publisher of edifice, ecology, and forensic inspection, diagnosis, and repair data for the public - we take no business nor fiscal connection with whatsoever manufacturer or service provider discussed at our website.

A brief summary almost InspectAPedia.com can be read at ABOUT InspectApedia.com - https://inspectapedia.com/Admin/About_InspectApedia.php

I have a Belsaw 1/2hp 3450 rpm that is former and demand a capacitor 210-260 mfd

@Devan,

Sure, glad to help.

You lot may have made the very common error of thinking that to replace a motor capacitor you have to buy the exact brand and shape as the original. Yous don't.

Cardinal is the capacitor rating - yours is 35uf or 35 microfarads - probably this is a motor run capacitor.

All of the data for your motor capacitor is written out as: 35uf +-five% (tolerance), 240V, fifty/60 Hz. You'll read in the article above that a suitable match that's 35uf will be ok even if it'south voltage rating is higher (as that'southward but a prophylactic upper limit);

The shape of the capacitor isn't critical, though it'd be nice if it would fit where the original did; if it won't it can exist mounted and wired from outside the space used by the original capacitor.

The cap you want is available from any electric supplier, motor repair shop, or HVAC supplier, and too from many online vendors, even large Amazon.

Below is an case, a QH QX6535 35uf Capacitor Motor Run Circular 35 uF MFD 370V HVAC as shown at Amazon.

Please also take a look at the electric motor capacitor selection advice to a higher place on this page.

I accept been looking all over for a replacement to this capacitor 35/5 240V, just to no avail. It is for a Leeson ane/2 hp greenhouse exhaust fan motor. Exercise know where I can find one? Cheers.

@Anonymous,

Not likely, anon; have a look through the motor start capacitor selection advice in the article above and you'll run into typical motor start capacitor ratings in uF and voltage for motors of diverse horsepower or size.

Can i use 10 MFD capacitor as outset capacitor

@Sal Licata, I doubtable that the "5904708 MFD" is either a misprint or a mixup of part number and MFD value. A ane.8 HP motor would typically employ a starting capacitor somewhat smaller than 105-126 µF / 220VAC (Don't fret the voltage; these capacitor values and their sources are found in tables above on this page)

The breaker trip could be due to a non-starting motor due to a bad cap equally you've diagnosed, but be alert for a motor with failing bearings or a shorted winding besides. The fact that your motor starts to rotate and and then trips the breaker argues for a motor failure, perhaps a winding that shorts when the motor gets to speed or simply a bad bearing, giving the motor-rotation resistance that soon causes an over-current.

I accept a 2 capactor 1.8 hp 120 volt motor on an old ridgid air compressor . I'yard dislocated nearly the values on a black plastic round cap that has 5904708 mfd 125 vac 60 hz and has ii terminals .I did not run across whatever thing like this on your web site .What do I take to do to replace this. I ohmed it and it comes upward ( 0 ) I think that say'southward it's open circuit . The trouble I have is the the motor runs 5 seconds and cuts off and pops a breaker . Tin can you lot help me.

Regards
Sal licata
sallicata66@yahoo.com

need start and run caps for this moving-picture show motor it runs an air compressor the one is readable the other blew out and is not readable
the i has the number but can not discover
need to order both if replacable is possible
Thanks

@keithhfletcher@gmail.com, Lamentable you can add together an image (.jpg .gif .img .jpeg etc) just not a PDF

Hi I got this cost pump motor that's a three-phase on my inquiry says I tin can catechumen it to unmarried phase only I need to know what size capacitor. And practise I need a stat capacitor and a run capacitor? See the PDF

@Paul,

thank you for the helpful feedback-follow-upward;

Sometimes all we need is a new start/run capacitor;

but be warned that sometimes the failed cap is a telltale that the real consequence is a failing motor - such equally due to a bad bearing. Go on me posted.

Hi, Dan. Pitiful for the delay in responding. Got slammed with work; I finally was able to get the washer up and exist able to become at the motor, transmission, capacitor, etc. Checked the transmission, turns smoothly and effortlessly. Motor is fine. Replaced the capacitor as nosotros talked about earlier-was able to zilch tie the new, cylindrical one to the original mounting bracket of the old box shaped i and started washing a full load. I watched it through the showtime cycle, and when the spin bicycle started, it kinda of stumbled before the motor kicked. It connected to drain and spin later on until the 'unbalanced' notification stopped it.

I had to re-level the clothes twice, then reset the controls to spin only; this time, the motor kicked in almost immediately and finished the cycle without a hitch. I likewise monitored the control panel/circuit lath temp. as it would very noticeably get quite warm a few minutes subsequently starting the washer (with the original capacitor)

. With the new one installed, there was a just the slightest sensation/feeling of warmth, just nothing compared to the original. Let's hope this turns out to be a successful prepare for the trouble. Thanks for your insight and aid with this! I'll proceed you notified if anything else happens.

Cheers, I will as soon equally I can go full admission to the 'innards'... ;)

Be sure we've not missed a begetting somewhere else such as in the tub assembly.

Also you may exist able to cheque the motor remotely by checking its current draw.

Thanks for the quick response, Dan! The symptom that leads me to the capacitor is a failure for the washer to spin/drain in the last part of the wheel...turning off the power and shutting off the billow, and then waiting 30-45 minutes to allows it to cool off enough to re-appoint and bleed and spin finer. I recently replaced the drain motor (cleaved impeller) and drive motor, but problem still exists.

Strong electrical smell of something overheating coming from the area of the capacitor. The location of the washer prohibits quick access to the motor/mechanical interior of machine to check/feel what is overheating. I'll supervene upon the capacitor and report back in the about future as to whether or not this works. Thank you again!

Paul:

Normally information technology is absolutely reasonable to replace a motor start or run capacitor with another one of the same specifications in voltage and capacitance - as we draw above on this folio.

Sometimes there is a physical "fit" problem that an original cap fit into a special and odd space where its replacement, that may exist different in size or shape, is not and so comfortable.

But nonsense: capacitors are connected by wires. If a cap doesn't fit in its one-time cubby, as long as it can be safely secured and protected from harm and thence continued to the motor it serves, it ought to be fine.

It may exist that whomever spoke with y'all doesn't desire to crawl out on the limb of common sense, having perhaps Liticaphobia.

Watch out: Keep in mind that if a motor capacitor burnt up because of an underlying trouble with a motor that'due south expressionless or dying or dangerous wiring, replacing the capacitor won't address the motor and fire-rubber concerns.

You lot might enquire that person

ane. What's the technical or safety objection to replacing the GE OEM washing machine capacitor with a replacement unit of equivalent value in volts and farads

and depending on that answer,

ii. Inquire that person to review the costs of spending other people's money for the person's peace of heed.

Or give out a copy of

inspectapedia.com/home_inspection/Other_Peoples_Money.php OTHER PEOPLE's Coin

Tin I use a replacement capacitor for a GE washing machine even though the original is no longer produced? I volition post pics of the original (w/specs) forth with a possible replacement. GE says the capacitor is model specific, just the replacement is from GE and is exactly the same specs and is used in later on units with the same motor. Thanks!

A reasonable guess is that the motor that is trying to start is failing, maybe with a bad bearing or burnt winding and information technology is drawing High electric current

I find burnt connections on the start capacitor. Looks every bit though the start terminal was over heated. I cant figure out why.

Mogamat

It looks equally if your motor runs at 220 or 380 Volts iii phase and at 220V runs at 16.5A while at 380V it runs at 9.6A.
The CAV on the data plate of this Italian motor from Tavernelle indicates that information technology'south a five.5 hp motor.

Typically the run capacitor on a v hp. motor is effectually xxx µF - 40 µF 370VAC

Typically the start capacitor for a 5 hp motor is effectually 600uF

To accept a stab at answering "how to catechumen a 3 phase motor to run on single phase ability" I found a variety of answers ranging from "it's easy" to "it's a really bad idea, even dangerous".

Kemet (cited in the guidebooks given in the article above) notes: By connecting a capacitor to the two phases it is possible to make a three-phase motor piece of work every bit a single-phase motor.

Sentinel out: you cannot simply claw upwards a three phase motor arbitrarily to single stage electric current; you need to review the wiring recommendations from motor companies or engineers.

Options include:

A phase shift capacitor;

Motor re-winding

Using a VFD or variable frequency drive

Employ a converter to catechumen your single phase power to DC (Direct Electric current) and and so use an inverter to power the motor. From what I read this is your best bet. Every bit ane EE notes "You can run a iii stage motor from single phase by converting the unmarried phase AC-DC(rectification) and then DC-Air conditioning(3 phase inverter)."

However pretty much everyone says this is an inefficient way to run a motor - i.e. your electric bill will be higher than necessary.

On Quora a Mumbai writer recommended:

Use capacitor of say 36 / 72 / 108 mfd 440 V rating.

Depending upon motor rating. Connect one end of this capacitor to open up unconnected terminal of motor.

The other terminal of capacitors tin be connected to one of the two live phases, and the motor volition outset running.

If you modify over the capacitor terminal to other phase , its direction of rotation will get reversed.

This organisation is routinely used in Bharat particularly in rural areas for running of pumps.

This arrangement is certainly not the optimum for the motor, and the phase difference betwixt the windings will differ from 120 degrees needed.

However, this does makes the motor starting time and save the day for farmers when 3 phase supply is not available. - www.quora.com/How-do-I-run-a-iii-stage-motor-in-a-unmarried-phase-line-using-a-capacitor

Come across: www.gohz.com/iii-stage-motor-running-on-single-phase-power-supply

See this commodity by Chuck Yung: www.plantengineering.com/articles/how-to-properly-operate-a-three-phase-motor-using-single-stage-power/ on running a iii-phase motor on unmarried stage power.

Notation that operating the motor on single phase may be expensive.

Skillful mean solar day. I have 3 phase compressor that I would like to run on single stage electric current. What size capacitor would I demand and will it need a run cap also?

Reader Question: benefactor says the club of numbers on the capacitor doesn't thing

6/sixteen/2014 Danno said:

I'one thousand replacing the capacitor in my AC condenser. The original/stock unit says 35/v 440 AC. This is the cap I ordered from a distributor, just upon receiving it, the box says "five/35 440" (the v and 35 are transposed. Distributor says its the aforementioned thing. Is this correct? Cheers for any 411

Respond:

Danno I think the scrambled order is not an issue as long as the key numbers on the capacitor match its application or match the old i AND every bit long as you connect the proper wires.

Example start/run capacitor markings

(Non specifying your particular capacitor)

• Voltage, e.g. 110-125V
• Capacitance, e.g. 189-227 µF or micro Farads or MFD (Start capacitors usually are over 60 µF)
• Capacitance, e.g. for a dual run capacitor: 35/5 refers to 35 MFD (for a compressor) and v MFD (for a fan motor)
• Temperature range, e.g. -forty - + 65C
• Cycles, due east.thousand. 50-sixty Hz

Decode a 35/five/440 marking on a motor starting capacitor

Reader Mark (18 June 2014) has given us a helpful and detailed translation of the markings found on beginning capacitors, repeated here:

Run capacitors: I ever was taught that 35/5 was a [dual] run capacitor. 35 is the microfarad rating for the compressor & five microfarad was for the fan. (3 terminals) not:

Decode a 35/5/440 marking on a motor starting capacitor:

The capacitor y'all are describing marked 35/5 440 is probably a dual run capacitor.

35/5 : The offset ii numbers are the capacitance 35 µF (for the compressor) and 5 µF (for the fan motor).

A dual "run capacitor" supports two electrical motors, such as in large air conditioner or heat pump units, with both a fan motor and a compressor motor.

It saves infinite by combining two physical capacitors into ane case. The dual capacitor has 3 terminals labeled

"C",

"FAN", and

"HERM", which stand for the Common, Fan, and HERMetically sealed compressor.[5]

440 refers to the ability to run voltages up to 440VAC

Dual run capacitors come in a variety of sizes, depending on the capacitance (µF), such equally twoscore plus 5 µF, and also the voltage. (Exist sure to connect properly to compressor motor, fan motor and mutual)

A 440 volt capacitor can be used in place of a 370 volt, but not a 370 in identify of a 440 volt.[two]

The capacitance must stay the same within 5% of its original value.[two]

Round cylinder-shaped dual run capacitors are usually used for air workout, to help in the starting of the compressor and the condenser fan motor.[two]

An oval dual run capacitor could be used instead of a round capacitor, merely the mounting strap should exist changed to better fit the oval shape

Watch out: Take a look at the wiring sheet that should be with your capacitor or wiring marked on the device itself to be sure that you lot are properly connecting the Start and Run wires and you'll be OK.

Equally we noted in the article above, the dual capacitor terminals may be labeled so that the 3 leads can be wired correctly:

• Southward = start wire connector
• R = Run wire connector
• C = mutual connector

Reader Question: your capacitor advice is all Greek to me

I have a Wayne one HP motor used as a utility pump. The capacitor burnt out. It is a rectangle plastic capacitor with two wires coming off of it.

The numbers on information technology are: 30 F /J/250VAC I don't run into a U before the F there are two symbols that wait similar arrows pointing to the right before the F letter. There is a name on it that says YUHCHANG ( P )

I read you commodity on how to choose a capacitor yet information technology'south all Greek to me. Then what am I looking for?

Thanks for your time, - Bearding past private email 2016/06/19

Reply: How to Choose the Correct Capacitor: iv options

Anon: in response to your query I've re-written our capacitor option explanation.

Four ways to find a matching or replacement motor capacitor are given at CAPACITOR SELECTION TIPS in this article.

Likewise if you tin can, transport me some sharp photos of the cap and its markings and I may be able to annotate farther. Mail a photo of your existing motor capacitor and its markings at the page lesser comments box, or use the page top or bottom CONTACT link.

Reader follow-up:

Hither is a photograph of the capacitor I'yard talking about.

OK so nosotros know this is probably merely a single-purpose motor-start capacitor, since starting capacitors are near-often 125, 165, 250 and 330 volt devices while run capacitors are rated for higher levels like 370 and 440 volts. If it were a dual-purpose capacitor you'd see 3 rather than simply 2 terminals.

You lot'll have no trouble buying a replacement at your local electrical supplier or even from an online supplier. Prices for a motor capacitor starting time at under $10. U.S.

Ask for a xxx microfarad 250VAC motor start capacitor. Take forth the one-time sick i to show your supplier.

At MOTOR CAPACITOR WIRING GUIDE we show how to hook up a typical capacitor.

Watch out: Keep me posted on how you lot exercise, and work with Ability OFF so yous live to tell me.

Question: what is the correct starting time capacitor for the motor shown in this photo?

Could you please point me towards the right capacitance for a get-go capacitor that tin can be connected to the engine presented in the attached picture?

I'yard agape I will install a too loftier or too low capacitance or voltage capacitor and impairment the motor. T.P. by private electronic mail 2017/07/14

Reply:

The characterization reads 16 µF 450V, that'southward the capacitor that Zhang Qiu Hai Er DianJi You Xian Gong Si the manufacturer specifies for this particular electrical motor, apparently model QC.J 01.

Reader follow-up:

Correct, the labels reads 16µF 450V. Is this the capacitance/voltage that I should use for the start capacitor? The 16µF seemed as well low compared to the tables yous presented in your website.

Respond:

The final Dominance on the right start or run capacitor to use with any motor is of course always the motors manufacturer.

The motor shown looks like a Haier double speed electrical motor shown in the photo below, excerpted from haiermotor.en.ec21.com/ where no details nor specification sheets for the motor were found.

Zhangqiu Haier Electromotor Co., Ltd. is a long-established producer of Haier electric motors located in Zhangqiu Economical Development Zone Jinan, Shandong, China and doing business since 1958.

The company became a subsidiary of Haier Group in 1998. These motors are used in household appliances such as washing machines, with other motor models used in refrigerators, air conditioners and other equipment.

More information including contact suggestions for repair parts or service are found at HAIER & HAIER AMERICA

...

Keep reading at MOTOR CAPACITOR WIRING GUIDE or select a topic from the closely-related manufactures below, or see the complete ARTICLE Alphabetize.

Or see CHOOSE a Get-go RUN CAPACITOR FAQs

Or come across these

Recommended Articles

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• Electrical MOTOR CENTRIFUGAL SWITCH or PTC PRD
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How To Size A Capacitor For A Compressor,

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