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Old 07-18-2010, 09:31 PM   #1
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Need Relay-Essex 129115-7180Z


I'm in need of a relay / contactor for my AC unit. It's an Essex 129115-7180Z
The stamp on the body reads:
AC Only 250V 18A
1HP - 125V 2HP 250V
Coil 24V
50/60Hz

An online search shows zip....it's an older unit.

I'm in Michigan


Last edited by StahlMaster; 07-19-2010 at 09:00 AM.
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Old 07-18-2010, 10:00 PM   #2
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Need Relay-Essex 129115-7180Z


Quote:
Originally Posted by StahlMaster View Post
250V 18A
2HP 250V
Coil 24V
I'm not an HVAC guy, but,
measure the coil current at a voltage close to 24 vac and divide the voltage by the current. Or measure its resistance.
How many terminals does it have? SPST, probably 4; DPST, 6
Then you'll have enough data to find a relay that equals or exceeds these specs. The replacement relay coil impedance should be equal to or higher than the value for your orig. relay.

http://www.google.com/search?hl=en&l...=&oq=&gs_rfai=


Last edited by Yoyizit; 07-18-2010 at 10:11 PM.
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Old 07-19-2010, 12:14 AM   #3
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Need Relay-Essex 129115-7180Z


Is it a relay, or a contactor.
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Old 07-19-2010, 09:04 AM   #4
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Need Relay-Essex 129115-7180Z


Quote:
Originally Posted by beenthere View Post
Is it a relay, or a contactor.
Good Question. I've heard it called both. I'm a bookbinder by trade. But I do know it's part number 129115-7180Z made by Essex.
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Old 07-19-2010, 09:08 AM   #5
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Need Relay-Essex 129115-7180Z


What is it in. An air handler, a furnace, or a condenser?

Contactors and relay replacements only need to meet the specs of the original one. Doesn't have to be the exact.

But, on some replacements, the position of the terminals changes, and can make using them a trying experience, since sometimes the wires are too short to reach the new terminal position.


Graingers, carries most any relay or contactor replacement someone would need.
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Old 07-19-2010, 09:17 AM   #6
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Need Relay-Essex 129115-7180Z


It is located in the air handler located in the attic.

Attached is a photo.
Attached Thumbnails
Need Relay-Essex 129115-7180Z-relay.jpg  
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Old 07-19-2010, 09:49 AM   #7
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Need Relay-Essex 129115-7180Z


http://www.famousparts.com/relays.html

http://americanhvacparts.com/Merchan...ory_Code=r-rbm

http://www.shopping.com/-essex+rbm+relays
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Old 07-19-2010, 10:02 AM   #8
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Need Relay-Essex 129115-7180Z


I checked all three of those sites. None have an exact replacement. I'd look for a non OEM but the space this part goes into is limited.

Thanks

D
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Old 07-19-2010, 10:40 PM   #9
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Need Relay-Essex 129115-7180Z


Quote:
Originally Posted by StahlMaster View Post
I checked all three of those sites. None have an exact replacement. I'd look for a non OEM but the space this part goes into is limited.

Thanks

D
You can lengthen the wires and put the relay almost anywhere inside the weatherproof enclosure. Probably #14 stranded will do it. I'd solder the splices and use heat shrink tubing to insulate.
The wire insulation chosen should probably be good to 600 vac and to at least 90C, and weather resistant. Maybe there are markings on the existing wire that will show the presently used gauge, insulation working voltage and temp. rating.
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Old 07-20-2010, 03:56 AM   #10
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Need Relay-Essex 129115-7180Z


try local www.grainger.com item # 1N184....$7.58 Page 3373 they welcome cash and homeowners
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Old 07-20-2010, 04:49 PM   #11
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Need Relay-Essex 129115-7180Z


I'll check it out.
The Schematic under the cover calls this part a "fan relay" soooo relay it is....not a contactor.
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Old 07-20-2010, 05:29 PM   #12
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Need Relay-Essex 129115-7180Z


Quote:
Originally Posted by StahlMaster View Post
I'll check it out.
The Schematic under the cover calls this part a "fan relay" soooo relay it is....not a contactor.
It's probably DPST.
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Old 07-21-2010, 03:26 AM   #13
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Need Relay-Essex 129115-7180Z


Stancor 129 looks similar.
http://www.stancor.com/wrdstc/pdfs/C.../Pg_064_65.pdf
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Old 07-22-2010, 06:31 PM   #14
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Need Relay-Essex 129115-7180Z


Thanks for all the help and links. I found an OEM replacement on E-Bay for $26 bucks. I hope this solves the problem of the fan not kicking on unlessl I hit the relay with a screwdriver.

D
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Old 07-23-2010, 01:46 PM   #15
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Need Relay-Essex 129115-7180Z


Quote:
Originally Posted by Yoyizit View Post
I'm not an HVAC guy, but,
measure the coil current at a voltage close to 24 vac and divide the voltage by the current. Or measure its resistance.
How many terminals does it have? SPST, probably 4; DPST, 6
Then you'll have enough data to find a relay that equals or exceeds these specs. The replacement relay coil impedance should be equal to or higher than the value for your orig. relay.

http://www.google.com/search?hl=en&l...=&oq=&gs_rfai=

I got the point, maybe the key is the replacement relay coil impedance should be equal

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