Hvac - 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, 12:22 AM   #1
Newbie
 
Join Date: Jul 2012
Posts: 2
Rewards Points: 10
Default

Hvac


Condenser motor runs with no call for cooling.changed 2 contactor n still having the same problem. Checked voltage, I am reading 120V on one side,
N nothing on the other side of the contactor. The condenser fan is turning slowly when I plug the disconnect.




I'll appreciate any input.

Advertisement


Last edited by Aafaissal; 07-26-2012 at 12:37 AM.
Aafaissal is offline   Reply With Quote
Old 07-26-2012, 05:45 AM   #2
Member
 
Join Date: Jun 2012
Location: Augusta, GA
Posts: 369
Rewards Points: 250
Default

Hvac


Does the motor run okay during a call for cooling?

You should read 120v to ground on BOTH sides of the LINE side of the contactor (the incoming voltage), and you should also read 240v across those lines. You must check both of these - don't assume that you have 240, put your meter on it and check it.

This is often caused by a shorted capacitor. You can also check that with an ohm meter - you should have no continuity to ground between any of the cap terminals.

Advertisement

scottmcd9999 is offline   Reply With Quote
Old 07-26-2012, 06:12 AM   #3
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 26,440
Rewards Points: 4,526
Default

Hvac


Short in the cap, fan motor or compressor.
beenthere is online now   Reply With Quote
The Following User Says Thank You to beenthere For This Useful Post:
ben's plumbing (07-26-2012)
Old 07-27-2012, 08:42 PM   #4
Newbie
 
Join Date: Jul 2012
Posts: 2
Rewards Points: 10
Default

Hvac


There's 240v from the disconnect to the contactor. What i'll like to know is why I'm I reading power across the contactor without the coil being energized.
When I call for cooling the unit works fine. Switch it off and the condenser fan keeps running. but slower this time. The unit is 4months old 410a.
Aafaissal is offline   Reply With Quote
Old 07-27-2012, 08:48 PM   #5
Mad Scientist
 
Join Date: Dec 2009
Location: Minnesota
Posts: 772
Rewards Points: 512
Default

Hvac


The contactor is only breaking one of the two incoming legs, (single pole contactor) and something is shorted to ground. Very dangerous; the metal parts of the condenser unit are probably live at 120V.
McSteve is offline   Reply With Quote
Old 07-27-2012, 09:00 PM   #6
Member
 
Join Date: Oct 2009
Location: Nebraska
Posts: 2,362
Rewards Points: 1,000
Default

Hvac


Short as stated above. Got to ask though, if the unit is only 4 months old why are you messing with it instead of calling the installers?

Advertisement

Marty S. is offline   Reply With Quote
The Following 2 Users Say Thank You to Marty S. For This Useful Post:
ben's plumbing (07-27-2012), scottmcd9999 (07-28-2012)
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
HELP!!! How much owe my HVAC repairman? Is he competant? MB1 HVAC 23 02-01-2012 03:42 PM
Runaround - HVAC and HWH proper venting/exhaust denemante HVAC 24 04-05-2011 09:50 PM
moving HVAC system - can I go without gas for a few days? denemante HVAC 2 03-30-2011 05:55 AM
History of HVAC Industry Brands winkydink HVAC 8 03-25-2011 08:28 AM
Engineered Joists & holes for HVAC ducts walt1122 Building & Construction 3 07-04-2009 08:37 PM




Top of Page | View New Posts