dual value motor run caps - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 6th February 2008, 03:18 PM   #1
wicked1 is offline wicked1  United States
diyAudio Member
wicked1's Avatar
Join Date: Jan 2008
Location: Midwest
Default dual value motor run caps

I picked up a few 2 value motor run caps. One lead says "fan" and the other says "Herm" and then there's common.

I'm guessing "fan" is the smaller value and "herm" would be the bigger?
I came to that conclusion because I'm thinking maybe some motors have a separate fan motor. So, the fan would need the small value, and the big motor would need the large value.

Is that correct?

  Reply With Quote
Old 6th February 2008, 03:24 PM   #2
diyAudio Member
pmillett's Avatar
Join Date: May 2005
Location: Dallas (but I am not a Texan!)
I guess so... I found this:

"Rule of thumb on wiring the capacitor is: Herm on capacitor goes to the start winding on the compressor, Fan on capacitor goes to brown fan wire that goes to the fan, and Com on the capacitor comes off one leg of the contactor to provide power to the capacitor."

For an air conditioner...
  Reply With Quote
Old 6th February 2008, 03:29 PM   #3
wicked1 is offline wicked1  United States
diyAudio Member
wicked1's Avatar
Join Date: Jan 2008
Location: Midwest
I'm afraid that it might be a combo of motor run and motor start in one case. I hope not!

I found another article that says fan is for the blower, and herm is for the compressor, so that sounds promising.

Thanks, I see you found a similar explanation as I was typing this
  Reply With Quote
Old 6th February 2008, 03:39 PM   #4
kuroguy is offline kuroguy  Germany
diyAudio Member
kuroguy's Avatar
Join Date: Sep 2007
herm is short for hermetic compressor. the fan connection would go to the condenser fan motor which is always a much smaller motor than the compressor
  Reply With Quote
Old 6th February 2008, 09:37 PM   #5
diyAudio Member
tubelab.com's Avatar
Join Date: Jul 2005
Location: West Virginia panhandle
These are dual run caps for an air conditioner. As stated earlier "fan" is the run cap for the fan motor, and "herm" is the run cap for the comressor. The compressor is HERMetically sealed. I have used them in tube amps. I just wired the fan and herm terminals together which puts both caps in parallel.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
ESR of motor-run caps? JoshK Tubes / Valves 12 14th December 2007 03:17 AM
DUAL 1214 - motor doesn't seem to work Rudy Verkorst Analogue Source 19 26th January 2007 04:02 PM
Motor caps croccodillo Tubes / Valves 13 1st December 2005 12:44 AM
ALPS motor-driven 10k dual audio potentiometer for sale Gabster Swap Meet 8 26th December 2002 08:28 PM

New To Site? Need Help?

All times are GMT. The time now is 03:10 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2