Help With 3 Wire To 4 Wire Condenser Fan Motor - HVAC - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 07-26-2012, 01:20 AM   #1
Newbie
 
Join Date: Jul 2012
Posts: 8
Rewards Points: 10
Default

Help with 3 wire to 4 wire condenser fan motor


I purchased a new condenser fan motor and matching two pole capacitor. The old motor had 3 wires and the new has 4. The old motor wire colors were brown, yellow and black. The new motor wire colors are brown, brown w/white stripe, black & white. I connected the two brown wires to the new capacitor (one on each pole), I connected the black wire to the side of the contactor where the black feed wire from the main disconnect connects and the white wire to the same side except where the white feed wire from the main disconnect comes in. Once I powered the unit back up I noticed that the fan was turning in the wrong direction so I swapped the direction wires (orange & red) and the fan worked great. After a couple of hours the unit cooled the house and all was fine.

Now, about 8 hours later I'm noticing that it doesn't seem like the fan on the unit has turned off since it started and the air coming out of the vents isn't as cool as it was. The temperature in the house has climbed 2 degrees in the last 30 minutes and even with the unit running isn't dropping.

Any help would be appreciated!
Attached Thumbnails
Help with 3 wire to 4 wire condenser fan motor-contactor.jpg   Help with 3 wire to 4 wire condenser fan motor-new-cap.jpg   Help with 3 wire to 4 wire condenser fan motor-old-cap.jpg  

Advertisement


Last edited by Rseate; 07-26-2012 at 01:52 AM. Reason: added images
Rseate is offline   Reply With Quote
Old 07-26-2012, 04:32 AM   #2
Member
 
biggles's Avatar
 
Join Date: Jan 2008
Location: Long Island
Posts: 3,630
Rewards Points: 2,000
Default

Help with 3 wire to 4 wire condenser fan motor


you have the condenser motor BLACK on the line side of that contactor,when the contactor closes the comp/fan run is the air blowing up and out into your face looking down into the condenser?

Advertisement

biggles is offline   Reply With Quote
Old 07-26-2012, 05:35 AM   #3
Newbie
 
Join Date: Jul 2012
Posts: 8
Rewards Points: 10
Default

Help with 3 wire to 4 wire condenser fan motor


Yes, it blows into my face
Rseate is offline   Reply With Quote
Old 07-26-2012, 07:38 AM   #4
Member
 
Join Date: Jun 2012
Location: Augusta, GA
Posts: 369
Rewards Points: 250
Default

Help with 3 wire to 4 wire condenser fan motor


In your first picture, assuming the Black and White wires with the blue terminal ends are your FAN leads, then you've got the white wire on the wrong side of the contactor (black wire doesn't matter which side on this contactor). Move the WHITE wire to the OTHER side of the contactor. In the configuration you're showing, the fan would always be powered on.

Also, unless your pictures are hiding something, it doesn't look like your compressor is wired up at all. The larger capacitor has wiring on the Common terminal only, it seems, where it should have wiring on the compressor terminals as well, and your contactor should have wires running to the compressor also.
scottmcd9999 is offline   Reply With Quote
Old 07-26-2012, 07:42 AM   #5
Newbie
 
Join Date: Jul 2012
Posts: 8
Rewards Points: 10
Default

Help with 3 wire to 4 wire condenser fan motor


Let me add a few more pictures and hopefully explain better:
The old motor was a 3 wire motor (black, yellow, brown)
The brown & yellow wires were attached to the large existing capacitor and the black wire was attached to the contactor as shown in the picture below.


I purchased a new motor which had 4 wires (black, white, brown, brown w/white stripe) I also purchased a new capacitor. I installed the new capacitor and connected the two brown wires to it.


I connected the black wire to the "right" side of the contactor and the white wire to the "left" side of the contactor.


When I switched the disconnect back on, the fan turned a quarter of a turn and stopped. I immediately turned the power off.

I then moved the black wire to the bottom "left" side of the contactor and the fan started right up.


I had to reverse the direction of the fan motor after it started. It cooled the house fine but then later in the evening the cooling stopped.
Rseate is offline   Reply With Quote
Old 07-26-2012, 07:51 AM   #6
Member
 
Join Date: Jun 2012
Location: Augusta, GA
Posts: 369
Rewards Points: 250
Default

Help with 3 wire to 4 wire condenser fan motor


Move the WHITE WIRE, not the BLACK wire. See picture

Why did you replace the motor? Bad bearings, or did it just stop working? If it just stopped working, then did you check the capacitor before replacing the motor? It's possible the cap is bad, which could cause the compressor to stop working (or not start at all).
Attached Thumbnails
Help with 3 wire to 4 wire condenser fan motor-contactor.jpg  
scottmcd9999 is offline   Reply With Quote
The Following User Says Thank You to scottmcd9999 For This Useful Post:
Rseate (07-26-2012)
Old 07-26-2012, 07:52 AM   #7
Newbie
 
Join Date: Jul 2012
Posts: 8
Rewards Points: 10
Default

Help with 3 wire to 4 wire condenser fan motor


Will do & thanks!
Bad bearing in the motor
Rseate is offline   Reply With Quote
Old 07-26-2012, 09:17 AM   #8
Member
 
Join Date: Jun 2012
Location: Augusta, GA
Posts: 369
Rewards Points: 250
Default

Help with 3 wire to 4 wire condenser fan motor


Don't often see a bad bearing in a new motor ... kinda odd ...
scottmcd9999 is offline   Reply With Quote
The Following User Says Thank You to scottmcd9999 For This Useful Post:
Rseate (07-26-2012)
Old 07-26-2012, 09:37 AM   #9
Newbie
 
Join Date: Jul 2012
Posts: 8
Rewards Points: 10
Default

Help with 3 wire to 4 wire condenser fan motor


Sorry, poor communication on my part. The original motor in the unit is the one I replaced (about 10 years old).
Rseate is offline   Reply With Quote
Old 07-26-2012, 09:47 AM   #10
Newbie
 
Join Date: Jul 2012
Posts: 8
Rewards Points: 10
Default

Help with 3 wire to 4 wire condenser fan motor


I think I understand; by connecting to the supply side like I did - the fan will run constantly because when the thermostat isn't calling for cooling and the connector disengages the fan won't know it because it isn't on the switched side, correct?

After moving the white wire to the other side of the connector, it should cycle on and off with the thermostat command if I am understanding correctly.

One question, even with the fan running constantly, why would the unit have stopped cooling during the night? Even with it wired incorrectly the way I had it, it cooled the house down but stopped cooling a few hours later.
Rseate is offline   Reply With Quote
Old 07-26-2012, 10:56 AM   #11
Member
 
Join Date: Jun 2012
Location: Augusta, GA
Posts: 369
Rewards Points: 250
Default

Help with 3 wire to 4 wire condenser fan motor


Have no idea about that - could be any number of things. As I asked earlier, did you check the Compressor capacitor? If that is bad, the compressor could run for a bit and then shut down.
scottmcd9999 is offline   Reply With Quote
Old 07-26-2012, 10:58 AM   #12
Newbie
 
Join Date: Jul 2012
Posts: 8
Rewards Points: 10
Default

Help with 3 wire to 4 wire condenser fan motor


It doesn't look bad?? The top is flat, no doming or bulging at all
Rseate is offline   Reply With Quote
Old 07-26-2012, 11:16 AM   #13
Member
 
Join Date: Jun 2012
Location: Augusta, GA
Posts: 369
Rewards Points: 250
Default

Help with 3 wire to 4 wire condenser fan motor


The only way to determine if a capacitor is bad is by checking it with a meter. Granted, if it's bulging it is definitely bad, but it can also be bad without any visible signs.
scottmcd9999 is offline   Reply With Quote
Old 07-26-2012, 06:50 PM   #14
Member
 
Join Date: Oct 2009
Location: Nebraska
Posts: 2,362
Rewards Points: 1,000
Default

Help with 3 wire to 4 wire condenser fan motor


Looks like an oil spot on that capacitor. Bet it's weak.
Marty S. is offline   Reply With Quote
Old 07-26-2012, 06:53 PM   #15
Newbie
 
Join Date: Jul 2012
Posts: 8
Rewards Points: 10
Default

Help with 3 wire to 4 wire condenser fan motor


Sorry I didn't update. Finally got a chance to check the capacitor and it was dead. Replaced it and all is fine now. Thank you to all for your help!

Advertisement

Rseate is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Installing Switch In Reversing AC Motor RetiredLE Electrical 18 10-26-2014 11:51 PM
How wire an HP 1.0 Motor Dayton ? Conquistador Electrical 5 01-27-2012 08:34 PM
Wiring a replacement blower motor bodtchboy HVAC 17 08-11-2011 11:05 PM
electric motor problem watchbill Electrical 14 06-22-2010 08:38 AM
Neutral Wire? 4x15mph Electrical 8 11-24-2008 02:00 PM




Top of Page | View New Posts