Keeps Burning Out A Relay For The Outside Condensor Motor - HVAC - DIY Chatroom Home Improvement Forum

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


Thread Tools Display Modes
Old 06-15-2012, 12:25 AM   #1
Join Date: Jun 2012
Posts: 2
Rewards Points: 10

keeps burning out a relay for the outside condensor motor

having trouble at work this one place keeps burning out a relay for the outside condensor motor been there 4 times Cannot figure out what the hells causing this to happen its driving me insane we put a little fuse popper on the circuit to protect it from burning out again but thats just putting a bandaid on it for now I gotta quit running the **** through my mind!It works great while your there everythings drawing the right amps running good like clockwork in 2 days they call again!

any ideas??????


Last edited by chrisachvac; 06-15-2012 at 12:28 AM.
chrisachvac is offline   Reply With Quote
Old 06-15-2012, 05:04 AM   #2
An old Tradesmen
Join Date: Oct 2008
Location: Somewhere
Posts: 34,604
Rewards Points: 8,194

Someone put a larger condenser fan motor in?


beenthere is online now   Reply With Quote
Old 06-15-2012, 06:03 AM   #3
Join Date: Jun 2012
Posts: 2
Rewards Points: 10

nope all original parts motor runs fine not too many amps its the control coil of the relay that keeps failing 208-240 volt coil I have 211 volts to that somethings rotten in denmark anyways no matter if the thing goes they can still run one of the indoor units its a duel zone mini split samsung Ill think on it this weekend they make relays that sense amp draw instead of using voltage that would cure the problem just have to do a little creative rewiring pretty much got the wiring diagram impressed in my brain now!
chrisachvac is offline   Reply With Quote
Old 06-15-2012, 12:13 PM   #4
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000

Coil is failing by shorting or failing by opening?

High temps. cause insulation to fail.

DC coil resistance is lower than AC coil impedance and may not accurately predict coil current.

All electromechanical relay armatures are pulled in by current but potential relays have a high coil resistance and a narrow pull-in to drop-out range.

If the steady-state values read OK you could have 120v transients going into the coil due to an intermittent short. If they are short enough the fuse may not melt.

Don't change circuitry until you solve this. There is something that you are assuming that is not true. The work is to find out what it is.

Last edited by Yoyizit; 06-15-2012 at 12:25 PM.
Yoyizit is offline   Reply With Quote
Old 06-15-2012, 08:09 PM   #5
Missouri Bound's Avatar
Join Date: Apr 2011
Location: Almost Arkansas
Posts: 2,764
Rewards Points: 2,000

What voltage is available at the equipment? I'm of the opinion that somewhere along the line some wires got switched around and you may have an instance where there is an excessive voltage put to the coil when some other switching is taking place. There is a surge of some kind creating this problem. Any other equipment having this issue? Is there a schematic on the equipment that you can use to verify all connections? It looks bad to keep coming back to fix the same thing over and over.
Do you want it your way or the right way?
Missouri Bound is offline   Reply With Quote

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
Wiring a Honeywell RA89A Relay shawnmd HVAC 9 10-17-2016 06:52 PM
power surge with 120v relay astetson Electrical 8 01-16-2012 10:46 PM
Help with baseboard heater relay 98mrd Electrical 20 12-29-2011 01:00 PM
Electric Baseboard Heat - relay problem? sporkman HVAC 7 11-21-2010 06:43 PM
newbie...relay problems jfabes Electrical 11 05-06-2008 04:48 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1