Ancient Westinghouse
M: SP018CAW
Style: 3958A46G01
Serial:MF63004
Big capacitor from pub era.
Thanks.
M: SP018CAW
Style: 3958A46G01
Serial:MF63004
Big capacitor from pub era.
Thanks.
Rundhaug- need capacitor size
knave
21 - 40 of 76 Posts
Yeah I was completely occupied with trying to explain simple electric to a tech & scared for his life. Sometimes I shouldn't multitask so much
Sent from my SM-G920V using Tapatalk
Joined
·
2,182 Posts
So, I just took readings from my own unit. NHP042AKA1 Comp. RLA 17.1
Voltage at capacitor terminals - 377 V (440 rated cap.)
Run cap. for compressor - 4.6 amps.
Black lead to compressor - 17.8 Amps (Hmmm, over the RLA)
Red lead to compressor - 16.8
(4.6 X 2650)/377 = 32.3 mfd Capacitor marking states it is a 40mfd. Oh, no!. Looks like I need a new cap..
Joined
·
39,604 Posts
If this was my problem to solve I'd try starting the compressor with a smallish run cap - just connect it up with jumper wires.
Start with some clearly too small capacitor, maybe 15uf. Let the run amps settle and then write down:
15 = _______
Then try a 20, a 25, a 30, a 35 and etc.
Write all them down the same way. I would expect the running amps to decline as the capacitance increased. When it started to increase I would go back to the one-previous size, make sure the cap terminal voltage was within limits, and call it a day.
Start with some clearly too small capacitor, maybe 15uf. Let the run amps settle and then write down:
15 = _______
Then try a 20, a 25, a 30, a 35 and etc.
Write all them down the same way. I would expect the running amps to decline as the capacitance increased. When it started to increase I would go back to the one-previous size, make sure the cap terminal voltage was within limits, and call it a day.
Yeah I don't like the word "should in this description.
Sent from my SM-G920V using Tapatalk
Joined
·
2,182 Posts
So, my thoughts a while back might not have been too screwy then.:yes:
Joined
·
39,604 Posts
No, and for most guys confronted with this on-site your idea is probably the quickest way to get the job done.
Plus; that serial number seems to indicate that the unit was made January 4, 1963 - how important is having the exact right capacitor going to be to it's lifespan. <g>
PHM
-------
T
Plus; that serial number seems to indicate that the unit was made January 4, 1963 - how important is having the exact right capacitor going to be to it's lifespan. <g>
PHM
-------
T
the model and serial#'s are stamped in metal, but nothing readable on the capacitor or compressor... Its a recip, and I cannot tell you which brand... Too many scrolls out there lol
this is interesting, i always assumed the amps on S + R would equal the amps on C... i guess common and run together would be like taking common minus run.... very interesting if this actually works.
Thanks for chiming in Mikey...
the RLA on this compressor was 11.6
I started with a 25/5... The compressor and fan used separate capacitors. So i just used Herm and common... The compressor started, and ran at 10.2 amps...
then i jumpered across Herm and Fan on the capacitor, making it a 30 mfd capacitor, and got 9.8 amps. Since recips generally take smaller capacitors than scrolls, and many two ton units that i service have 35mfd capacitors, i decided to call it good.
voltage from c to herm was 361
capacitance under load, using 'rash's formula, was 38.8Mfd...
Thanks again for the help guys....
:cheers:
Joined
·
39,604 Posts
After you do email them to yourself - then what happens? How do you get a picture you have emailed yourself into a post on this forum?
PHM
-------
PHM
-------
I read that somewhere recently too. It was as a short cut to cap checking. If your readings were within 0.1 amp, held as accurately as you can, then the cap is good. If off by more than 0.2 or 0.3 range then you'd better shut er down and check the cap specifically. I tried that the next day and found 2 weak caps with that method. Kind of nice to do while the unit is running.
I email them from my phone to myself@gmail.com.
Then open my email on laptop computer and save the pictures to the folder of choice. Then begin the process of uploading to htalk.
Is that the answer you wanted? <g>
Then open my email on laptop computer and save the pictures to the folder of choice. Then begin the process of uploading to htalk.
Is that the answer you wanted? <g>
Joined
·
39,604 Posts
No.
It is this: "the process of uploading to htalk" that I am interested in having explained.
PHM
-------
It is this: "the process of uploading to htalk" that I am interested in having explained.
PHM
-------
How I do it may not be correct but works for me.
in the "advanced reply" window, there is a paper clip icon along the top. If you click that thing, you can click "choose file" and upload pictures to the site.
then I believe you can select the uploaded picture (still within the attachment screen) and it will post in your message.
Joined
·
39,604 Posts
.
Attachments
Joined
·
35,746 Posts
So all this time, we think you're this burly, bearded genius, and now your going to tell us you're the one with the drink? :Faint:
Joined
·
8 Posts
I never understood why manufacturers don't list cap. sizes for the compressor and fan right on the equipment info tag. All other electric info is on there...
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
They do about 70% of the time on compressors. More often on fan motors, almost 99%.
Sent from my SM-G920V using Tapatalk
21 - 40 of 76 Posts
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
