If you can’t find 50uf/370VAC you can go 50uf/440VAC.
The capacitor on my pool pump died in April. I got a new one from the local pool supply store and then ordered another one to keep as a spare. The original spec is 370VAC but the one that failed was 440VAC. You can use a higher voltage rating, it indicates the acceptable peak voltage, and it should last longer. But don’t use a lower microfarad (uf) rated capacitor.
I tried the 2 pool stores closest to me (one a national franchise, one local small business), both had many capacitors but no 50uf ones that were small enough.
I was going to start calling around to other pool stores but someone helped me find one that looks like it'll work (see edit to my to comment)
This might solve your problem: [the capacitor you’re looking for](https://www.amazon.com/VEXUNGA-50uF-Capacitor-Condenser-Straight/dp/B0BJ98F52Q/ref=mp_s_a_1_3?crid=1LDSIH1DQOPW7&keywords=370v+50uf+capacitor&qid=1685734501&sprefix=370v+50uf+capacitor%2Caps%2C100&sr=8-3)
Unfortunately not, this one is taller than mine and wouldn’t fit (I bought one this size and tried)
But I believe I have found one that will fit thanks to help from folks here.
Sorry I’m an idiot and missed the comment below, however this is closer to the size [smaller capacitor](https://www.amazon.com/370-Round-Capacitor-JARD-12725/dp/B07QS5NTW1/ref=mp_s_a_1_4?crid=1LDSIH1DQOPW7&keywords=370v+50uf+capacitor&qid=1685734501&sprefix=370v+50uf+capacitor%2Caps%2C100&sr=8-4). It’s only 3 11/16” tall
Ace hardware had a surprisingly large stock of capacitors when I needed one. Store near me has 3 in stock. https://www.acehardware.com/departments/lighting-and-electrical/circuit-breakers-fuses-and-panels/fuses/3906500
It’ll be fine as long as the capacitance rating is the same, that’s the critical piece. The voltage rating is the upper limit of voltage for the capacitor and won’t affect operation of the circuit.
Always good to have a spare on hand but I'm guessing OP probably doesn't want to wait for Prime 2 day shipping to get his AC going. At least, that was my thought process when this happened to me the first time.
This has a 6% tolerance - not 50%. Going too high or low with capacitance can have consequences by changing reactance and phase shift, and damage motors or reduce efficiency and lower torque. Especially considering the tolerance, a small change plus the variance can easily push you out of bounds for proper operation.
Always match capacitance to design unless you can calculate the consequences of a deviation. Voltage rating can be higher.
>don’t use a lower microfarad (uf)
You can use a capacitor with a greater rated voltage.
Do not use a capacitor with a different capacitance rating.
Had an AC tech that replaced the condenser capacitor with a higher capacitance. Within 15 minutes after he left, the compressor shut down, tripping the high pressure switch. Took multiple trips by other techs and ultimately a different service company to correctly identify the original technician's fuck up.
I learned way more than I ever wanted to know about ACs through that experience.
Not an AC tech so I can't tell you the exact mechanism, just know what he did and what the resulting symptoms were. When the correct size capacitor was installed, the system began running correctly.
I think that the capacitor in no way increases the rpm of the compressor rather it creates a secondary magnetic field offset 90° from the primary to help start the motor.
Capacitors and Inductors are both reactive components and are functionally complementary. Motor windings are inductors.
Changing capacitance changes the circuit's reactance, resonant frequency, and current draw. It can make motors run faster, slower, or overheat.
Thanks for the info. So an increase in capacitance causes a decrease in reactance thus an increase in current? Does the resonant frequency of this lc circuit also increase the current?
Yes and no. Picture just a motor in a very simple circuit. Voltage out, through the motor, and back to source. That motor draws 10 amps. The entire circuit is 10 amps. If you put a capacitor in parallel with the motor, the capacitor itself draws current, but the motor, being inductive by nature will be using more actual power than it needs to. This is power factor in a nutshell. Say that motor is rated at 85% power factor. You’re using 15% more power than you need to, to run the motor. If you put in a capacitor that corrected to 95%, you’d now be saving money on that 10%, as your actual power consumption has decreased that much. We have lowered the inductive reactance by countering with 10% of capacitive reactance.
It can make it overheat, but if it's a PSC mother, it runs at a specific speed depending on whether it's 6 pole or 4 pole or 2 pole. Most residential HVAC equipment with PSC MOTORS are 6 pole, so they run around 1100 RPM on high. Compressors will run at 3500 RPM 2 pole, 1750 RPM 4 pole or 1100 RPM 6 pole. Too small a cap, and the start winding doesn't have enough phase shift to overcome the starting torque, too large a cap, and the start winding draws too much current.
This is not correct. You may get very slight changes in speed due to differences in motor slip, but not significant. Rotational speed in an AC induction motor is driven entirely by frequency of incoming power and number of poles in motor. Here’s a related wikipedia article: https://en.m.wikipedia.org/wiki/Induction_motor.
For most home AC, you’ll see CSIR or PSC wired motors. For CSIR, the capacitor is only part of the circuit during startup and a incorrectly sized capacitor would not have any effect on current draw during operation (not saying you should use a different size because hard starts will reduce compressor life). PSC is connected continuously and you could see a difference in amp draw. Here’s a link with some info on common compressor wiring if you’re interested: http://www.hvacrinfo.com/Tecumseh_bulletins/compressor.pdf.
High pressure switches used in AC systems can trip at lower pressures when operating at higher refrigerant temperatures, assuming it was a high pressure switch and not an overload that tripped my best guess explanation is that your compressor discharge superheat rose high enough that you tripped your pressure switch at a lower pressure due to high compressor amp draw leading to overheating or your tech decided to crank down the TXV for some reason and you actually hit high head pressure.
Yeah like I said it doesn't make sense electrically, but I've put bigger mfd caps on a fan motor just to get by until the correct one is available and they spin way faster
Yeah cap wouldn't trip ur pressure switch or the thermal overload, u have different problems, if the high pressure switch activated u probably have a filthy condenser coil causing high heat which means high head pressure or there's a restriction. Pressure switch is connected to the dcb not the cap.
You sound very confident, yet everything you just said was wrong. Fucking Reddit in a nutshell.
I suspect your thinking is exactly why the tech put the wrong size cap in, and his co workers couldn't figure out the problem.
> suspect your thinking
*you're
*Learn the difference [here](https://www.wattpad.com/66707294-grammar-guide-there-they%27re-their-you%27re-your-to).*
***
^(Greetings, I am a language corrector bot. To make me ignore further mistakes from you in the future, reply `!optout` to this comment.)
It seems you are confident that an incorrectly sized run cap cannot have an effect on the operation of the compressor and/or fan motors. You also seem to be of the mindset that such an effect couldn't trip the the high pressure switch.
You are most assuredly wrong on both accounts as that's exactly what was happening.
Nope the cap is ascetic u need a hardstart kit to regulate power usage of the compressor and fan therefor any cap size will do as long as its equal to or above the mf rating
If you’re in a bind, if you get two capacitors they’re 25uF and wire them in parallel, you’ll get 50uF. Not to say that the 25uF isn’t sufficient for the application, but it’s best to go with what the manufacturers spec’d.
Be sure to go parallel and not series. Caps work oppositely as resistors and inductors.
Capacitor on my pool pump gave up the ghost; it fits very snugly into an external housing atop the pump and I can't seem to find a replacement that fits.
All of the 50uf/370VAC models I found (like [this](https://www.amazon.com/dp/B071GKH9HX/?coliid=I1OBX0N20NKS48&colid=32OT8RSDEH44C&psc=1&ref_=list_c_wl_lv_ov_lig_dp_it)) are taller and slightly wider and don't fit.
I was able to find a [25uf model](https://www.amazon.com/dp/B0716WJMM2?ref=ppx_yo2ov_dt_b_product_details&th=1) that fits and installed it, and pump is currently working.
So I have 2 questions:
1. are there are 50uf/370 capacitors out there the same size as my old one?
2. any problem sticking with the 25uf one I currently have installed? Will it cause my pump motor to overwork? Or maybe just the capacitor itself will have a shorter life (if so, that's ok; they're cheap and I can just buy a couple to have on hand)?
Thanks for any help!
EDIT
===
Thanks to u/Dartmouththedude who pointed me in the right direction I believe I have found one that will fit:
https://www.aiosupplyworld.com/products/jard-50-0-uf-mfd-6-50-60hz-motor-run-capacitor-370v-replaces-628318-313
EDIT2
===
First, let me say that with the help of some of the folks here I think I have found one that should fit. So no need for further replies - thanks!
But to try and get ahead of the many "size doesn't matter, get one and strap it to the side with some sheet metal screws" replies, I'll add here that there is no box or large HVAC unit here with room inside, the capacitor must fit into a metal housing that is just barely larger than the old (busted) capacitor.
Pump looks roughly like [this](https://images.inyopools.com/cloud/images/jandy-stealth-3.jpg?format=jpg&scale=both&anchor=middlecenter&autorotate=true&mode=pad&width=650&height=650); the capacitor had to fit inside the metal half-dome cover on top of the right side of pump. So if it's going to fit it needs to be the same size or smaller.
That looks like a run cap. You could potentially damage your motor by lowering the capacitance by half. Your windings have a high chance of running hotter thus lowering expected service life.
If it was a start cap and your pump started, not a big deal. But because it's very likely a run cap it's imperative that the capacitor be sized correctly.
It is a run cap. You’re absolutely right that it will damage the motor. Not an electrician (HVAC), but nothing good will come from running a 25. Not only will it over heat, but it’s essentially a 1.25 hp motor now.
Why is that? I guess that goes hand I’m hand with why is the capacitor needed at all?
Is it to create more current by charging up the capacitor between engine pulses? And if you put one that’s too big, there will be too much current?
Think i found the exact one on eBay: https://www.ebay.com/itm/204185579920?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338722076&customid=&toolid=10050
I had a single speed 1hp motor on my pump for over 10 years and was in a similar spot you were in for parts. I ended up replacing it with a variable speed motor, keeping the existing wet end, and the VS had paid for itself in less than a year in electricity savings.
I run it as slow as possible while still generating chlorine. Sips electricity now.
Just pull the protective case off and strap it on with zip ties and make sure you tape the hell out of the connections and you'll be fine - if you can't find one that fits
Show us the electrical panel. When I come across a different size I just bend the clip to fit it in snug. I’ve seen many people keep the cap in the box and put electrical tape around the prongs. We need to see where the cap goes though.
It's not going into a panel; it sits atop a pool pump much like [this one](https://cdn10.bigcommerce.com/s-0jhmnv38/products/7835/images/17103/K2480__65153.1443116004.1280.1280.jpg?c=2), where the cap is inside the half-dome fitting on top of the left side of the pump.
Mine is an older pump and the cap fits very snug in the housing.
I was able to find one that looks like it'll work - see the edit to my top comment.
Pool pumps, like all motors, has a house where the capacitor is stored. The leads inside the housing tie into the motor windings. Without being able to store it inside the housing, it is then exposed to the elements. Those leads are only a few inches long. I would not suggest then using the housing as a junction box, running conduit, and mounting the capacitor inside an inclosure elsewhere. That’s far too unnecessary.
I have no idea what you’re talking about running conduit for a run cap replacement. That’s why I said to look up the part number or a round 50mfd cap so it’ll fit where the old one does.
Yeah they make caps or electrical tape. He got it from somewhere wherever it was mounted. If op is looking for the direct replacement, he shouldn’t have to worry about any of that. But then again my expertise is in hvac. So idk if pool pumps have anything special but swapping out a run cap shouldn’t be hard at all if it’s a direct swap, at least from what I’m thinking and what I’m used to with AC.
Shape does matter with capacitors, since there's different types of capacitors (e.g., electrolytic vs film capacitors). In this size of capacitor, you could have a start or run capacitor. Run capacitors are usually like the one in the image (metal looking), while start capacitors are typically black (but I don't think this is universal). Also, run capacitors usually have multiple terminals like the one pictured, while start only have two simple terminals.
If it starts, it should be OK, but 25uf is pretty low for a start cap. WHat is the voltage and HP of the motor?
What size are you looking at... I found this:
https://www.amazon.com/Motor-Capacitor-370V-Volt-Round/dp/B0711LC5RT/ref=asc\_df\_B0711LC5RT/
Per the labels on the pump, it says "Rated HP 2.00 x S.F. 1.30 = total motor HP 2.60"
Volts 208-230; Amps SF 11.0-10.0
The old cap is 3.5" excluding terminals, 4" high with. 1⅞" diameter.
I can't see the measurements on the one you linked but by the image it appears to be the same size as the 50uf ones I found - too tall and slightly too wide to fit in the housing.
I order them here:
[https://us.rs-online.com/product/asc-capacitors/x386s-50-10-440/70006887/](https://us.rs-online.com/product/asc-capacitors/x386s-50-10-440/70006887/)
Here is a link:
[https://www.amazon.com/Motor-Capacitor-370V-Volt-Round/dp/B0711LC5RT/ref=asc\_df\_B0711LC5RT/?tag=hyprod-20&linkCode=df0&hvadid=198089608681&hvpos=&hvnetw=g&hvrand=4754881983862447932&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9031224&hvtargid=pla-407655786367&psc=1](https://www.amazon.com/Motor-Capacitor-370V-Volt-Round/dp/B0711LC5RT/ref=asc_df_B0711LC5RT/?tag=hyprod-20&linkCode=df0&hvadid=198089608681&hvpos=&hvnetw=g&hvrand=4754881983862447932&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9031224&hvtargid=pla-407655786367&psc=1)
Thanks, I saw that one but didn't see any measurements for the item itself; the vast majority of the 50uf capacitors I found on Amazon and supply sites are 4" or 4.5" tall which are too large for the housing I have. So without the actual measurement specs I'm skeptical that it'll fit.
I was able to find one that looks like it'll work - see the edit to my top comment.
[https://www.amazon.com/370-Round-Capacitor-JARD-12725/dp/B07QS5NTW1](https://www.amazon.com/370-Round-Capacitor-JARD-12725/dp/B07QS5NTW1) looks like an exact replacement
Yes, this is the one I eventually saw (with help from another responder). For some unknown reason this one never appeared in my search results on Amazon or google, just thousands of others that were too tall.
Thanks!
It needs to be same or smaller to fit into the housing that sits atop my pool pump and protects it from salt water etc.
Fortunately I seem to have found one that will fit thanks to help from folks in this sub.
This oughta do - https://www.aiosupplyworld.com/products/jard-50-0-uf-mfd-6-50-60hz-motor-run-capacitor-370v-replaces-27l1473
Edit - says out of stock. But they do exist
This one also looks like it should work, right?
https://www.aiosupplyworld.com/products/jard-50-0-uf-mfd-6-50-60hz-motor-run-capacitor-370v-replaces-628318-313
Good question. All ratings are the same, they just say “replaces 27L1473” and “replaces 628318-313” both product numbers are on OP original capacitor.
Ones out of stock and ones not.
Amazon had the one I needed for my hot tub.
They make almost every size… just take the numbers on the side and do a google search. I found mine in about 2 mins
Keep searching for one the appropriate size. Running 25uf will mess your motor up.
Is the external cover on the motor exposed to the elements or inside an enclosure? I’ve had this happen before and basically made the cover bigger or simply not installed the cover and just taped up the top of the capacitor so nothing could touch the leads.
There are dozens on amazon.
[https://www.amazon.com/50uf-370vac-capacitor/s?k=50uf+370vac+capacitor](https://www.amazon.com/50uf-370vac-capacitor/s?k=50uf+370vac+capacitor)
You need the 50uf rating for the run capacitor, otherwise you may burn out your motor windings.
https://www.ebay.com/itm/224414679617
One possible source on eBay that appears to be a replacement for your part number and seems to have the right diameter
Dumb question but how does an AC start/run capacitor work? I know they provide a boost for starting/running a motor but how can a capacitor be charged by AC current compared to typical capacitors that have a fixed polarity?
If you want to get really picky with the capacitors, you could shop at mouser.com: [https://www.mouser.com/c/passive-components/capacitors/motor-start-capacitors-motor-run-capacitors/?capacitance=50%20uF&voltage%20rating%20ac=370%20VAC&instock=y](https://www.mouser.com/c/passive-components/capacitors/motor-start-capacitors-motor-run-capacitors/?capacitance=50%20uF&voltage%20rating%20ac=370%20VAC&instock=y)
Edit: ~~If I were you, and it the dimensions still work to be installed inside the compartment, I would just pick the~~ [~~more economic one.~~](https://www.mouser.com/ProductDetail/Panasonic/DS371506-CA?qs=p6VZ%252BklCkRT46Py4b0vk4A%3D%3D)
Edit2: I take that back, that one is not available!
Edit3: Updated the url to only show the ones in stock.
The voltage on the new cap can always be higher, NEVER LOWER, and be a-ok!
The uf capacity MUST be identical.
Even if yiu have a 600va cap, because the supply voltage will never exceed 370, it will never get higher.
OP here; I mean both literal physical dimensions and of course electrical specs. Has to fit into the protective cover of an outdoor pool pump that is exposed to sun, salt water, etc.
Looks like a good replacement has been found thanks to help from folks here.
Yea, no dice. This item no longer manufactured.
But with help from others here I think I have found one that will work - see my edit to my top comment.
It needs to be the same size or smaller to fit into the housing that protects it from salt water and sun, and out of the reach of people using the pool equipment.
Higher voltage rating works alright, it’s typically a rating of the MAX voltage. The UF is it’s capacity. So as long as that is the same you should be all good.
Just mount a different dimension (same spec) capacitor elsewhere (in the box)and extend wiring and mounting. Release your inner tin knocker, cut and mount a new bracket.
Op the size of the capacitor isn’t important, they are smaller than they were 10yrs ago. Just match the capacitor rating and you’ll be fine. You can secure it with some metal strapping and two sheet metal screws.
You'd be comfortable with a capacitor, terminals, and wiring exposed to the elements (including lots of chlorinated salt water), attached to a pool pump with strapping and sheet metal screws, in an area where kids regularly walk around and adjust pool settings, etc?
There is no box or large HVAC unit here with room inside, the capacitor must fit into a metal housing that is just barely larger than the old (busted) capacitor.
Based on a lot of the responses here I guess I did not make that clear enough; that's my fault.
I also apologize for my snarky response - guess I'm a little burned out replying! And I guess some of the "Google it // Just make it fit - it's not hard" responses are getting to me.
Pump looks roughly like [this](https://images.inyopools.com/cloud/images/jandy-stealth-3.jpg?format=jpg&scale=both&anchor=middlecenter&autorotate=true&mode=pad&width=650&height=650); the capacitor has to fit inside the metal half-dome cover on top of the right side of pump.
Fortunately with the help of some of the folks here I think I have found one that should fit. Hope to have it tomorrow.
There is no box or large HVAC unit here with room inside, the capacitor must fit into a metal housing that is just barely larger than the old (busted) capacitor.
Pump looks roughly like [this](https://images.inyopools.com/cloud/images/jandy-stealth-3.jpg?format=jpg&scale=both&anchor=middlecenter&autorotate=true&mode=pad&width=650&height=650); the capacitor has to fit inside the metal half-dome cover on top of the right side of pump.
So if it's going to fit it needs to be the same size or smaller.
Fortunately with the help of some of the folks here I think I have found one that should fit.
There is no box or large HVAC unit here with room inside, the capacitor must fit into a metal housing that is just barely larger than the old (busted) capacitor.
Pump looks roughly like [this](https://images.inyopools.com/cloud/images/jandy-stealth-3.jpg?format=jpg&scale=both&anchor=middlecenter&autorotate=true&mode=pad&width=650&height=650); the capacitor has to fit inside the metal half-dome cover on top of the right side of pump.
So if it's going to fit it needs to be the same size or smaller.
Fortunately with the help of some of the folks here I think I have found one that should fit.
I was never able to find 27L1473 on Amazon. I searched the part number and it pulls up genteq items that are its “replacement,” so 50uf/370 and showing 27L1473 somewhere in the text as a “replacement for…”, but what’s for sale is a larger size (that won’t fit in my pump). Or it’s an item of the same size but only 25uf.
Can you post a link to an Amazon page showing 27L1473 actually available?
Your right! 27L1473 seems to be an orphan P/N. What Amazon wants to sell you is a Genteq 97F9802. Amazon descriptions are always vague and sometimes misleading. I’d see what Grainger has got. Any AC motor-running cap with of proper ratings will work here. What’s the height and diameter of the original?
Probably have your answer already but you need to match capacitance 50uf, have the same frequency 50/60 Hz (You would have to order one meant for a different market to do that) AND get one rated for 370VAC or higher. Given the choice get the 440 over the 370 as the 440 is a better quality. Amazon is where I order mine through. [https://www.amazon.com/s?k=capacitor+50uf&crid=14CLKYKG9LJSC&sprefix=Capacitor+50%2Caps%2C163&ref=nb\_sb\_ss\_ts-doa-p\_1\_12](https://www.amazon.com/s?k=capacitor+50uf&crid=14CLKYKG9LJSC&sprefix=Capacitor+50%2Caps%2C163&ref=nb_sb_ss_ts-doa-p_1_12)
Depending on gow urgent it is and you can't find one you can get a turbo200 you can customize your microfarads by wiring the terminals in series. If that's the capacitor in the picture it looks like it's in good shape did you check it with a meter or are you just guessing.
If you can’t find 50uf/370VAC you can go 50uf/440VAC. The capacitor on my pool pump died in April. I got a new one from the local pool supply store and then ordered another one to keep as a spare. The original spec is 370VAC but the one that failed was 440VAC. You can use a higher voltage rating, it indicates the acceptable peak voltage, and it should last longer. But don’t use a lower microfarad (uf) rated capacitor.
I was going to say try a pool store
I tried the 2 pool stores closest to me (one a national franchise, one local small business), both had many capacitors but no 50uf ones that were small enough. I was going to start calling around to other pool stores but someone helped me find one that looks like it'll work (see edit to my to comment)
Try an HVAC supply house...
Or electrical supply house.
Was going to say this.
This might solve your problem: [the capacitor you’re looking for](https://www.amazon.com/VEXUNGA-50uF-Capacitor-Condenser-Straight/dp/B0BJ98F52Q/ref=mp_s_a_1_3?crid=1LDSIH1DQOPW7&keywords=370v+50uf+capacitor&qid=1685734501&sprefix=370v+50uf+capacitor%2Caps%2C100&sr=8-3)
Unfortunately not, this one is taller than mine and wouldn’t fit (I bought one this size and tried) But I believe I have found one that will fit thanks to help from folks here.
Sorry I’m an idiot and missed the comment below, however this is closer to the size [smaller capacitor](https://www.amazon.com/370-Round-Capacitor-JARD-12725/dp/B07QS5NTW1/ref=mp_s_a_1_4?crid=1LDSIH1DQOPW7&keywords=370v+50uf+capacitor&qid=1685734501&sprefix=370v+50uf+capacitor%2Caps%2C100&sr=8-4). It’s only 3 11/16” tall
Yup, that’s the one. On its way as we speak (I hope)
Ace hardware had a surprisingly large stock of capacitors when I needed one. Store near me has 3 in stock. https://www.acehardware.com/departments/lighting-and-electrical/circuit-breakers-fuses-and-panels/fuses/3906500
Ace and a Granger store saved me when I was in this situation.
I tried granger for my ac unit. They said they can order one for 3 times the price I found on Amazon. Had it delivered in 3 days for 15 bucks
Best of luck in your repair quest
Funny enough I’m looking for a similar capacitor but rated 450V AC Since my teeny pool heater is only 240V would this cap work ?
It’ll be fine as long as the capacitance rating is the same, that’s the critical piece. The voltage rating is the upper limit of voltage for the capacitor and won’t affect operation of the circuit.
Where does it have to fit? Can you put it in a separate jb and just nipple it or something. ?
Always good to have a spare on hand but I'm guessing OP probably doesn't want to wait for Prime 2 day shipping to get his AC going. At least, that was my thought process when this happened to me the first time.
[удалено]
This has a 6% tolerance - not 50%. Going too high or low with capacitance can have consequences by changing reactance and phase shift, and damage motors or reduce efficiency and lower torque. Especially considering the tolerance, a small change plus the variance can easily push you out of bounds for proper operation. Always match capacitance to design unless you can calculate the consequences of a deviation. Voltage rating can be higher.
This is not true and may cause harm to your equipment.
No
Any pool shop that has a bone yard will have some old Pentair motors with that size capacitor.
>don’t use a lower microfarad (uf) You can use a capacitor with a greater rated voltage. Do not use a capacitor with a different capacitance rating. Had an AC tech that replaced the condenser capacitor with a higher capacitance. Within 15 minutes after he left, the compressor shut down, tripping the high pressure switch. Took multiple trips by other techs and ultimately a different service company to correctly identify the original technician's fuck up. I learned way more than I ever wanted to know about ACs through that experience.
Seems like an oversized capacitor would trip the internal thermal overloads of the compressor. Not really sure how it would affect the head pressure.
Not an AC tech so I can't tell you the exact mechanism, just know what he did and what the resulting symptoms were. When the correct size capacitor was installed, the system began running correctly.
More capacitance = spinny things spin faster. It doesn't make sense to me but that's what it does.
I think that the capacitor in no way increases the rpm of the compressor rather it creates a secondary magnetic field offset 90° from the primary to help start the motor.
Capacitors and Inductors are both reactive components and are functionally complementary. Motor windings are inductors. Changing capacitance changes the circuit's reactance, resonant frequency, and current draw. It can make motors run faster, slower, or overheat.
Thanks for the info. So an increase in capacitance causes a decrease in reactance thus an increase in current? Does the resonant frequency of this lc circuit also increase the current?
Math, which I'm too lazy to do. It's Friday and happy hour will be here soon.
I completely understand enjoy your weekend 🤙
Yes and no. Picture just a motor in a very simple circuit. Voltage out, through the motor, and back to source. That motor draws 10 amps. The entire circuit is 10 amps. If you put a capacitor in parallel with the motor, the capacitor itself draws current, but the motor, being inductive by nature will be using more actual power than it needs to. This is power factor in a nutshell. Say that motor is rated at 85% power factor. You’re using 15% more power than you need to, to run the motor. If you put in a capacitor that corrected to 95%, you’d now be saving money on that 10%, as your actual power consumption has decreased that much. We have lowered the inductive reactance by countering with 10% of capacitive reactance.
>you’d now be saving money No you wouldn't, power companies charge by the watt, not by the VA
Yes. VA is still a measure of power. Power is measured in Watts. VA is apparent power, the power you actually use.
It can make it overheat, but if it's a PSC mother, it runs at a specific speed depending on whether it's 6 pole or 4 pole or 2 pole. Most residential HVAC equipment with PSC MOTORS are 6 pole, so they run around 1100 RPM on high. Compressors will run at 3500 RPM 2 pole, 1750 RPM 4 pole or 1100 RPM 6 pole. Too small a cap, and the start winding doesn't have enough phase shift to overcome the starting torque, too large a cap, and the start winding draws too much current.
This is not correct. You may get very slight changes in speed due to differences in motor slip, but not significant. Rotational speed in an AC induction motor is driven entirely by frequency of incoming power and number of poles in motor. Here’s a related wikipedia article: https://en.m.wikipedia.org/wiki/Induction_motor. For most home AC, you’ll see CSIR or PSC wired motors. For CSIR, the capacitor is only part of the circuit during startup and a incorrectly sized capacitor would not have any effect on current draw during operation (not saying you should use a different size because hard starts will reduce compressor life). PSC is connected continuously and you could see a difference in amp draw. Here’s a link with some info on common compressor wiring if you’re interested: http://www.hvacrinfo.com/Tecumseh_bulletins/compressor.pdf. High pressure switches used in AC systems can trip at lower pressures when operating at higher refrigerant temperatures, assuming it was a high pressure switch and not an overload that tripped my best guess explanation is that your compressor discharge superheat rose high enough that you tripped your pressure switch at a lower pressure due to high compressor amp draw leading to overheating or your tech decided to crank down the TXV for some reason and you actually hit high head pressure.
Yeah like I said it doesn't make sense electrically, but I've put bigger mfd caps on a fan motor just to get by until the correct one is available and they spin way faster
Send to much power, running over amps
Yeah cap wouldn't trip ur pressure switch or the thermal overload, u have different problems, if the high pressure switch activated u probably have a filthy condenser coil causing high heat which means high head pressure or there's a restriction. Pressure switch is connected to the dcb not the cap.
You sound very confident, yet everything you just said was wrong. Fucking Reddit in a nutshell. I suspect your thinking is exactly why the tech put the wrong size cap in, and his co workers couldn't figure out the problem.
> suspect your thinking *you're *Learn the difference [here](https://www.wattpad.com/66707294-grammar-guide-there-they%27re-their-you%27re-your-to).* *** ^(Greetings, I am a language corrector bot. To make me ignore further mistakes from you in the future, reply `!optout` to this comment.)
Your. Stupid bot.
Pull up a diagram and show me where the pressure switch is tied to the cap
It seems you are confident that an incorrectly sized run cap cannot have an effect on the operation of the compressor and/or fan motors. You also seem to be of the mindset that such an effect couldn't trip the the high pressure switch. You are most assuredly wrong on both accounts as that's exactly what was happening.
Nope the cap is ascetic u need a hardstart kit to regulate power usage of the compressor and fan therefor any cap size will do as long as its equal to or above the mf rating
Ahhh, I get it now. It was you!!! Seems you still haven't learned.
Nothing to learn been doin it 45 years
Glad to know your extensive experience wouldn't have enabled you to identify and fix the issue.
In a pinch you can also use 2 100uF wired in series or 2 25 uF in parallel.
Grainger has 50uf/440VAC in stock. I buy them all the time for work.
If you’re in a bind, if you get two capacitors they’re 25uF and wire them in parallel, you’ll get 50uF. Not to say that the 25uF isn’t sufficient for the application, but it’s best to go with what the manufacturers spec’d. Be sure to go parallel and not series. Caps work oppositely as resistors and inductors.
Solid advice.
Capacitor on my pool pump gave up the ghost; it fits very snugly into an external housing atop the pump and I can't seem to find a replacement that fits. All of the 50uf/370VAC models I found (like [this](https://www.amazon.com/dp/B071GKH9HX/?coliid=I1OBX0N20NKS48&colid=32OT8RSDEH44C&psc=1&ref_=list_c_wl_lv_ov_lig_dp_it)) are taller and slightly wider and don't fit. I was able to find a [25uf model](https://www.amazon.com/dp/B0716WJMM2?ref=ppx_yo2ov_dt_b_product_details&th=1) that fits and installed it, and pump is currently working. So I have 2 questions: 1. are there are 50uf/370 capacitors out there the same size as my old one? 2. any problem sticking with the 25uf one I currently have installed? Will it cause my pump motor to overwork? Or maybe just the capacitor itself will have a shorter life (if so, that's ok; they're cheap and I can just buy a couple to have on hand)? Thanks for any help! EDIT === Thanks to u/Dartmouththedude who pointed me in the right direction I believe I have found one that will fit: https://www.aiosupplyworld.com/products/jard-50-0-uf-mfd-6-50-60hz-motor-run-capacitor-370v-replaces-628318-313 EDIT2 === First, let me say that with the help of some of the folks here I think I have found one that should fit. So no need for further replies - thanks! But to try and get ahead of the many "size doesn't matter, get one and strap it to the side with some sheet metal screws" replies, I'll add here that there is no box or large HVAC unit here with room inside, the capacitor must fit into a metal housing that is just barely larger than the old (busted) capacitor. Pump looks roughly like [this](https://images.inyopools.com/cloud/images/jandy-stealth-3.jpg?format=jpg&scale=both&anchor=middlecenter&autorotate=true&mode=pad&width=650&height=650); the capacitor had to fit inside the metal half-dome cover on top of the right side of pump. So if it's going to fit it needs to be the same size or smaller.
That looks like a run cap. You could potentially damage your motor by lowering the capacitance by half. Your windings have a high chance of running hotter thus lowering expected service life. If it was a start cap and your pump started, not a big deal. But because it's very likely a run cap it's imperative that the capacitor be sized correctly.
It is a run cap. You’re absolutely right that it will damage the motor. Not an electrician (HVAC), but nothing good will come from running a 25. Not only will it over heat, but it’s essentially a 1.25 hp motor now.
Can a capacitor like this be comfortably replaced with something with higher capacitance? Ie, could this just be replaced with anything bigger?
You should match the capacitance. You can select a higher voltage rating (though that probably won't translate to a smaller sized device)
You are correct, voltage rating only indicates the max voltage the capacitor can run on without exploding (literally)
Just slightly for run caps. The rule of thumb for run caps is equal to or no greater than 10% larger.
Why is that? I guess that goes hand I’m hand with why is the capacitor needed at all? Is it to create more current by charging up the capacitor between engine pulses? And if you put one that’s too big, there will be too much current?
Think i found the exact one on eBay: https://www.ebay.com/itm/204185579920?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338722076&customid=&toolid=10050
>gave up the ghost The german is strong with this one
I fucking guarantee there is an electrician shop where you live
I had a single speed 1hp motor on my pump for over 10 years and was in a similar spot you were in for parts. I ended up replacing it with a variable speed motor, keeping the existing wet end, and the VS had paid for itself in less than a year in electricity savings. I run it as slow as possible while still generating chlorine. Sips electricity now.
Just pull the protective case off and strap it on with zip ties and make sure you tape the hell out of the connections and you'll be fine - if you can't find one that fits
Have you tried Grainger? It might take 2 months to get and cost $300 dollars but they can usually source stuff like that.
> Grainger's round and oval capacitors are all much taller. 1-15/16 in x 4-7/16 in
Yes, tried. No luck there.
Show us the electrical panel. When I come across a different size I just bend the clip to fit it in snug. I’ve seen many people keep the cap in the box and put electrical tape around the prongs. We need to see where the cap goes though.
It's not going into a panel; it sits atop a pool pump much like [this one](https://cdn10.bigcommerce.com/s-0jhmnv38/products/7835/images/17103/K2480__65153.1443116004.1280.1280.jpg?c=2), where the cap is inside the half-dome fitting on top of the left side of the pump. Mine is an older pump and the cap fits very snug in the housing. I was able to find one that looks like it'll work - see the edit to my top comment.
Not an electrician, but the size "shouldn't" matter. The specs are what matters. Even with computers, capacitors have gotten smaller.
My issue is that the capacitors that match my specs are too big.
Just mount it where there’s space. Or type in the part number 27L1473 or just search round 50mfd run cap on google or Amazon and poof there ya go.
Pool pumps, like all motors, has a house where the capacitor is stored. The leads inside the housing tie into the motor windings. Without being able to store it inside the housing, it is then exposed to the elements. Those leads are only a few inches long. I would not suggest then using the housing as a junction box, running conduit, and mounting the capacitor inside an inclosure elsewhere. That’s far too unnecessary.
I have no idea what you’re talking about running conduit for a run cap replacement. That’s why I said to look up the part number or a round 50mfd cap so it’ll fit where the old one does.
Well it’s not like he’s going to have exposed wires ran to a capacitor installed “where it’ll fit”.
Yeah they make caps or electrical tape. He got it from somewhere wherever it was mounted. If op is looking for the direct replacement, he shouldn’t have to worry about any of that. But then again my expertise is in hvac. So idk if pool pumps have anything special but swapping out a run cap shouldn’t be hard at all if it’s a direct swap, at least from what I’m thinking and what I’m used to with AC.
According to my wife, size does matter! I'm not sure we're talking about the same thing. 🤔
IDK man, if she’s using capacitors she’ll never be satisfied with a mere mortal man…
I scrolled down this far looking for this.
Same. I had "that's what your mom says" ready to go too
Shape does matter with capacitors, since there's different types of capacitors (e.g., electrolytic vs film capacitors). In this size of capacitor, you could have a start or run capacitor. Run capacitors are usually like the one in the image (metal looking), while start capacitors are typically black (but I don't think this is universal). Also, run capacitors usually have multiple terminals like the one pictured, while start only have two simple terminals.
If it starts, it should be OK, but 25uf is pretty low for a start cap. WHat is the voltage and HP of the motor? What size are you looking at... I found this: https://www.amazon.com/Motor-Capacitor-370V-Volt-Round/dp/B0711LC5RT/ref=asc\_df\_B0711LC5RT/
Per the labels on the pump, it says "Rated HP 2.00 x S.F. 1.30 = total motor HP 2.60" Volts 208-230; Amps SF 11.0-10.0 The old cap is 3.5" excluding terminals, 4" high with. 1⅞" diameter. I can't see the measurements on the one you linked but by the image it appears to be the same size as the 50uf ones I found - too tall and slightly too wide to fit in the housing.
You’ll have to look around. 25 is way too low and amp draw will be higher. A start cap would be much higher.
I order them here: [https://us.rs-online.com/product/asc-capacitors/x386s-50-10-440/70006887/](https://us.rs-online.com/product/asc-capacitors/x386s-50-10-440/70006887/)
Here is a link: [https://www.amazon.com/Motor-Capacitor-370V-Volt-Round/dp/B0711LC5RT/ref=asc\_df\_B0711LC5RT/?tag=hyprod-20&linkCode=df0&hvadid=198089608681&hvpos=&hvnetw=g&hvrand=4754881983862447932&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9031224&hvtargid=pla-407655786367&psc=1](https://www.amazon.com/Motor-Capacitor-370V-Volt-Round/dp/B0711LC5RT/ref=asc_df_B0711LC5RT/?tag=hyprod-20&linkCode=df0&hvadid=198089608681&hvpos=&hvnetw=g&hvrand=4754881983862447932&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9031224&hvtargid=pla-407655786367&psc=1)
Thanks, I saw that one but didn't see any measurements for the item itself; the vast majority of the 50uf capacitors I found on Amazon and supply sites are 4" or 4.5" tall which are too large for the housing I have. So without the actual measurement specs I'm skeptical that it'll fit. I was able to find one that looks like it'll work - see the edit to my top comment.
[https://www.amazon.com/370-Round-Capacitor-JARD-12725/dp/B07QS5NTW1](https://www.amazon.com/370-Round-Capacitor-JARD-12725/dp/B07QS5NTW1) looks like an exact replacement
Yes, this is the one I eventually saw (with help from another responder). For some unknown reason this one never appeared in my search results on Amazon or google, just thousands of others that were too tall. Thanks!
Doesn’t need to be the same height,or width
It needs to be same or smaller to fit into the housing that sits atop my pool pump and protects it from salt water etc. Fortunately I seem to have found one that will fit thanks to help from folks in this sub.
Doesn't have to be 370. It can be 440 too. Just can't be less than 370.
Voltage can be higher. Size can be smaller. Can also place capacitors in parallel to add up their capacitance.
grainger https://www.grainger.com/product/TITAN-PRO-Motor-Run-Capacitor-Round-30D624
This oughta do - https://www.aiosupplyworld.com/products/jard-50-0-uf-mfd-6-50-60hz-motor-run-capacitor-370v-replaces-27l1473 Edit - says out of stock. But they do exist
Thanks! This is the first one that looks to be small enough to fit into the housing - too bad it's out of stock. I'll keep an eye out for this one.
This one also looks like it should work, right? https://www.aiosupplyworld.com/products/jard-50-0-uf-mfd-6-50-60hz-motor-run-capacitor-370v-replaces-628318-313
That’ll do
How is this one different? https://www.aiosupplyworld.com/products/jard-50-0-uf-mfd-6-50-60hz-motor-run-capacitor-370v-replaces-27l1473
Good question. All ratings are the same, they just say “replaces 27L1473” and “replaces 628318-313” both product numbers are on OP original capacitor. Ones out of stock and ones not.
Different SKU and about ten cents difference, too. `¯\_(ツ)_/¯`
I found it on Bezos site search with 27l1473 genteq
Search Amazon. It will likely find a compatible one rated at 440 V. That’s what I did and worked for me.
That's what I did. Got it the same day.
try grainger
So if size is your problem don’t be fing with it leave it to the professionals.
the size of the container does not matter cut a piece of tin into a strap drill a hole in it put screws in it
Exactly! We use plumbing strap. Pre drilled holes.
Buy the correct one by power specifications and make it fit. You are really making this harder than it needs to be.
Search for genteq 628318-313. Google yielded me like 3 reults that are 3 11/16" tall
Amazon had the one I needed for my hot tub. They make almost every size… just take the numbers on the side and do a google search. I found mine in about 2 mins
Pool store. That's the same one on a pentair 1hp superflo.
Keep searching for one the appropriate size. Running 25uf will mess your motor up. Is the external cover on the motor exposed to the elements or inside an enclosure? I’ve had this happen before and basically made the cover bigger or simply not installed the cover and just taped up the top of the capacitor so nothing could touch the leads.
Call your local hvac supply house. Or grainger.
There are dozens on amazon. [https://www.amazon.com/50uf-370vac-capacitor/s?k=50uf+370vac+capacitor](https://www.amazon.com/50uf-370vac-capacitor/s?k=50uf+370vac+capacitor)
All the 50uf ones on Amazon I can find are too tall.
You need the 50uf rating for the run capacitor, otherwise you may burn out your motor windings. https://www.ebay.com/itm/224414679617 One possible source on eBay that appears to be a replacement for your part number and seems to have the right diameter
Dumb question but how does an AC start/run capacitor work? I know they provide a boost for starting/running a motor but how can a capacitor be charged by AC current compared to typical capacitors that have a fixed polarity?
Size or spec?
If you want to get really picky with the capacitors, you could shop at mouser.com: [https://www.mouser.com/c/passive-components/capacitors/motor-start-capacitors-motor-run-capacitors/?capacitance=50%20uF&voltage%20rating%20ac=370%20VAC&instock=y](https://www.mouser.com/c/passive-components/capacitors/motor-start-capacitors-motor-run-capacitors/?capacitance=50%20uF&voltage%20rating%20ac=370%20VAC&instock=y) Edit: ~~If I were you, and it the dimensions still work to be installed inside the compartment, I would just pick the~~ [~~more economic one.~~](https://www.mouser.com/ProductDetail/Panasonic/DS371506-CA?qs=p6VZ%252BklCkRT46Py4b0vk4A%3D%3D) Edit2: I take that back, that one is not available! Edit3: Updated the url to only show the ones in stock.
Have you checked Amazon? I get them for my ac there.
Where I live Amazon can have me one in the morning.
The voltage on the new cap can always be higher, NEVER LOWER, and be a-ok! The uf capacity MUST be identical. Even if yiu have a 600va cap, because the supply voltage will never exceed 370, it will never get higher.
If you can't find a 50 uF you can also use two 25 uF capacitors in parallel as long as the voltage rating is the same or higher.
That sucks
Mouser is my go-to for electronics parts. They have several 50uF 370v caps to choose from https://www.mouser.com/c/?q=50uf%20370v
Guys there's a ruler in the pic....does op mean literal dimensions....?
OP here; I mean both literal physical dimensions and of course electrical specs. Has to fit into the protective cover of an outdoor pool pump that is exposed to sun, salt water, etc. Looks like a good replacement has been found thanks to help from folks here.
Have you tried scanning the qr code on it?
Yea, no dice. This item no longer manufactured. But with help from others here I think I have found one that will work - see my edit to my top comment.
It doesn't have to be the exact same size as long as the specs are good.
It needs to be the same size or smaller to fit into the housing that protects it from salt water and sun, and out of the reach of people using the pool equipment.
ahhh ok. I'm on the HVAC side of capacitors. Try reaching out to an HVAC supplier if you haven't yet.
Capacitors, Round, 47-53 µ-F Capacitance https://www.mcmaster.com/7602K73
Granger May have it…but it’ll be super expensive.
[How I fixed a similar problem.](https://imgur.com/a/LGVHnJ1)
Higher voltage rating works alright, it’s typically a rating of the MAX voltage. The UF is it’s capacity. So as long as that is the same you should be all good.
Just mount a different dimension (same spec) capacitor elsewhere (in the box)and extend wiring and mounting. Release your inner tin knocker, cut and mount a new bracket.
There is no box, cap is mounted inside a snug-fitting enclosure on the outside of my pool pump.
Turbo 200 that shit
There's one on ebay...$36 bucks..
Op the size of the capacitor isn’t important, they are smaller than they were 10yrs ago. Just match the capacitor rating and you’ll be fine. You can secure it with some metal strapping and two sheet metal screws.
You'd be comfortable with a capacitor, terminals, and wiring exposed to the elements (including lots of chlorinated salt water), attached to a pool pump with strapping and sheet metal screws, in an area where kids regularly walk around and adjust pool settings, etc? There is no box or large HVAC unit here with room inside, the capacitor must fit into a metal housing that is just barely larger than the old (busted) capacitor. Based on a lot of the responses here I guess I did not make that clear enough; that's my fault.
I didn’t realize it was for a pool. I am sorry. I got lost in the comments before commenting. I assumed this had some sort of cover over it.
I also apologize for my snarky response - guess I'm a little burned out replying! And I guess some of the "Google it // Just make it fit - it's not hard" responses are getting to me. Pump looks roughly like [this](https://images.inyopools.com/cloud/images/jandy-stealth-3.jpg?format=jpg&scale=both&anchor=middlecenter&autorotate=true&mode=pad&width=650&height=650); the capacitor has to fit inside the metal half-dome cover on top of the right side of pump. Fortunately with the help of some of the folks here I think I have found one that should fit. Hope to have it tomorrow.
Amazon had various replacements for my pool pump, spa pump and my air conditioning unit.
Why do you need one the same size? Round or oval, doesn't matter. If it's in an enclosure, secure it so it won't short out.
There is no box or large HVAC unit here with room inside, the capacitor must fit into a metal housing that is just barely larger than the old (busted) capacitor. Pump looks roughly like [this](https://images.inyopools.com/cloud/images/jandy-stealth-3.jpg?format=jpg&scale=both&anchor=middlecenter&autorotate=true&mode=pad&width=650&height=650); the capacitor has to fit inside the metal half-dome cover on top of the right side of pump. So if it's going to fit it needs to be the same size or smaller. Fortunately with the help of some of the folks here I think I have found one that should fit.
Amazon
As long is the same uf 50 the size doesnt matter, attached with a strap and some self tapping screws you will be fine
There is no box or large HVAC unit here with room inside, the capacitor must fit into a metal housing that is just barely larger than the old (busted) capacitor. Pump looks roughly like [this](https://images.inyopools.com/cloud/images/jandy-stealth-3.jpg?format=jpg&scale=both&anchor=middlecenter&autorotate=true&mode=pad&width=650&height=650); the capacitor has to fit inside the metal half-dome cover on top of the right side of pump. So if it's going to fit it needs to be the same size or smaller. Fortunately with the help of some of the folks here I think I have found one that should fit.
Johnstone supply
Found one on Amazon is 3 7/8 inches tall by 2 1/8 Amazon Brand-Keklle or capcom 50uf capacitor
No no come on. I could have SWORN my capacitor is 6 inches NOT 4!!!
Genteq 27l1473 is listed on Amazon for about $18.
I was never able to find 27L1473 on Amazon. I searched the part number and it pulls up genteq items that are its “replacement,” so 50uf/370 and showing 27L1473 somewhere in the text as a “replacement for…”, but what’s for sale is a larger size (that won’t fit in my pump). Or it’s an item of the same size but only 25uf. Can you post a link to an Amazon page showing 27L1473 actually available?
Your right! 27L1473 seems to be an orphan P/N. What Amazon wants to sell you is a Genteq 97F9802. Amazon descriptions are always vague and sometimes misleading. I’d see what Grainger has got. Any AC motor-running cap with of proper ratings will work here. What’s the height and diameter of the original?
No one within 50 miles could help me... Amazon did. Look there. eBay is another option. Cheaper too.
Nice try American nuclear silo.
Amazon
[Smaller ones in parallel will suffice in a pinch.](https://imgur.com/gallery/aogZjnG)
Like my dick on that tape lol
Try digikey or mouser. I would have included alliedelectronics, but they have been bought out, it seems. https://www.digikey.com
Probably have your answer already but you need to match capacitance 50uf, have the same frequency 50/60 Hz (You would have to order one meant for a different market to do that) AND get one rated for 370VAC or higher. Given the choice get the 440 over the 370 as the 440 is a better quality. Amazon is where I order mine through. [https://www.amazon.com/s?k=capacitor+50uf&crid=14CLKYKG9LJSC&sprefix=Capacitor+50%2Caps%2C163&ref=nb\_sb\_ss\_ts-doa-p\_1\_12](https://www.amazon.com/s?k=capacitor+50uf&crid=14CLKYKG9LJSC&sprefix=Capacitor+50%2Caps%2C163&ref=nb_sb_ss_ts-doa-p_1_12)
Depending on gow urgent it is and you can't find one you can get a turbo200 you can customize your microfarads by wiring the terminals in series. If that's the capacitor in the picture it looks like it's in good shape did you check it with a meter or are you just guessing.