Re: HVAC Start/Run Capacitor question.
[Re: IMGTX]
#3034030
04/16/22 07:56 AM
04/16/22 07:56 AM
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Joined: Jan 2006
Posts: 8,162 USA
360view
Moparts resident spammer
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Moparts resident spammer
Joined: Jan 2006
Posts: 8,162
USA
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I would check the voltages at both fan motor and compressor, before start, during start up and when motors seem near run speed rpm. Since you have two separate motors it is a clue that BOTH show a slow start up that is a sign of low voltage at high amp start load. Look for high resistance connections with “green death crud” and check fuses. The Chinese made start capacitors do fail very frequently with short lives. The “two capacitors in one case” seem to fail even more frequently. The factory original USA made, with the now illegal PCB oil filled capacitor, on my Amana AC unit lasted from 1983 to 2011 but the Chinese capacitors seem to last 2-4 years, and the parts store clerks confirm this. The made in Mexico capacitor now has lasted 5 years. Definitely search on line for a copy of the manual for your unit with a wiring diagram, amp draws, freon pressures, etc. There are a lot of scam manual sites online now, so use caution. I found my Amana manual online at https://www.manualslib.com
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Re: HVAC Start/Run Capacitor question.
[Re: 360view]
#3034039
04/16/22 08:19 AM
04/16/22 08:19 AM
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Joined: Jan 2006
Posts: 8,162 USA
360view
Moparts resident spammer
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Moparts resident spammer
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Posts: 8,162
USA
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Re: HVAC Start/Run Capacitor question.
[Re: massdaytona]
#3034050
04/16/22 09:03 AM
04/16/22 09:03 AM
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Joined: Jan 2003
Posts: 10,702 North Dakota
6PakBee
I Live Here
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I Live Here
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North Dakota
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Sure seem to be having a rash of problems with single phase capacitor start/capacitor run motors lately. Ok, first thing, is the compressor motor a separate motor or is the compressor one of the sealed can varieties? What is the nameplate information on the compressor/compressor motor itself? Condenser fan, what is the nameplate information on it? Sometimes there is a wiring diagram on the inside of one of the covers, is there one?
Without some info, all I can give you is guesses.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: HVAC Start/Run Capacitor question.
[Re: cudaman1969]
#3034159
04/16/22 04:41 PM
04/16/22 04:41 PM
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Joined: May 2019
Posts: 6,221 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,221
nowhere
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I can guaranty if it’s good, touch the connectors it’ll knock the heck out of you, ask me how I know. Ground them first, a ohm tester will show if it’s good, A ohm test won't tell you it's good. Only that it is completely bad. Capacitors need to be read by a capacitor tester to see if they are good. Their values can change rendering it useless for the application, but it will still "pass" an ohms test and still zap you.
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Re: HVAC Start/Run Capacitor question.
[Re: IMGTX]
#3034180
04/16/22 05:45 PM
04/16/22 05:45 PM
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Joined: Jan 2005
Posts: 4,404 Michigan
MarkZ
Worthy
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Worthy
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Michigan
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The condenser motor wiring diagram calls for 5MFD @ 370v. That cap you have is a 5MFD @ 440v piece. I've seen caps that are compatible with both voltages, but they're usually labeled as such.
1987 Fifth Avenue - 512/518/D60
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Re: HVAC Start/Run Capacitor question.
[Re: IMGTX]
#3034201
04/16/22 06:31 PM
04/16/22 06:31 PM
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Joined: Dec 2012
Posts: 1,823 Wind Gap,Pa.
Sammy
top fuel
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top fuel
Joined: Dec 2012
Posts: 1,823
Wind Gap,Pa.
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Unit Label
I know it is oooold but I just want a few weeks to pick out a new system I want not it was the only one I could find right away.
Thanks Never seen a bad capacitor make a fan not spin. Compressor won't even try and start if the capacitor is bad.
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Re: HVAC Start/Run Capacitor question.
[Re: Sammy]
#3034223
04/16/22 07:48 PM
04/16/22 07:48 PM
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Joined: Jan 2005
Posts: 4,404 Michigan
MarkZ
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Worthy
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Michigan
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I could NOT find [censored] based on the model number of AC unit itself. That thing flat out doesn't exist as far as Google is concerned. If I'm reading the serial correct though, it was made in 1989 by Nordyne, now known as Nortek. Instead, I cross referenced the model numbers of the compressor and fan motors to find the required capacitor ratings. For the compressor: https://www.dcne.com/UserFiles/Reso...nElectric-Copeland_00324_2_9_38_BROC.pdfNew replacement model for the CRD4-0200-PFV is a CR24K6-PFV. It says 35MFD at 370v. For the fan motor I used the wiring diagram you posted and a couple other sources online to verify. So a 35+5MFD 370vAC is what you need.I misspoke in my last reply. You can use a higher rated voltage cap. What you have now has the correct capacitance ratings for both motors, so it should work. Maybe it's bad out of the box.
1987 Fifth Avenue - 512/518/D60
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Re: HVAC Start/Run Capacitor question.
[Re: MarkZ]
#3034236
04/16/22 08:25 PM
04/16/22 08:25 PM
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Joined: Jan 2003
Posts: 10,702 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
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North Dakota
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I could NOT find [censored] based on the model number of AC unit itself. That thing flat out doesn't exist as far as Google is concerned. If I'm reading the serial correct though, it was made in 1989 by Nordyne, now known as Nortek. Instead, I cross referenced the model numbers of the compressor and fan motors to find the required capacitor ratings. For the compressor: https://www.dcne.com/UserFiles/Reso...nElectric-Copeland_00324_2_9_38_BROC.pdfNew replacement model for the CRD4-0200-PFV is a CR24K6-PFV. It says 35MFD at 370v. For the fan motor I used the wiring diagram you posted and a couple other sources online to verify. So a 35+5MFD 370vAC is what you need.I misspoke in my last reply. You can use a higher rated voltage cap. What you have now has the correct capacitance ratings for both motors, so it should work. Maybe it's bad out of the box. Good sleuthing. I followed the same path and came up with the same conclusion. The fact that the fan works but the compressor doesn't seems to bear out MarkZ's comment that your new capacitor may be defective.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: HVAC Start/Run Capacitor question.
[Re: IMGTX]
#3034336
04/17/22 10:21 AM
04/17/22 10:21 AM
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Joined: Feb 2011
Posts: 957 MN
Droop69
super stock
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super stock
Joined: Feb 2011
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MN
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The compressor could be mechanically dragging, quite common on older hermetic compressors. I would put a hard start capacitor on the compressor, and use the 5 UF 370v side of the capacitor you have for the condenser fan motor. Check all of your electrical connections for loose and or corroded terminals.
Last edited by Droop69; 04/17/22 10:28 AM.
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Re: HVAC Start/Run Capacitor question.
[Re: IMGTX]
#3034348
04/17/22 10:50 AM
04/17/22 10:50 AM
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Joined: May 2003
Posts: 3,041 N.W. Florida
Fat_Mike
master
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master
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N.W. Florida
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Thank you all for the help.
I am beginning to wonder if the problem is something else because the fan turns, but starts slow. It never seems to reach full speed then after a while stops. After a little while starts the cycle again. The compressor just makes a constant struggling sound like it's working but not as correctly. MarkZ (or anyone else with A/C knowledge), could a plugged up condensation line make it act like that? I had to clean mine yesterday.
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