- Home


Air Conditioners | Dehumidifiers | Dishwashers | Disposals | Dryers | Freezers | Humidifiers | Ice Makers | Microwave Ovens | Ovens, Ranges, Stoves | Refrigerators | Trash Compactors | Washers | Water Filters

FAQs | Contact | Apprenticeship | Parts | Model Number Help | Newsletter | Beer

Find Appliance Parts & Diagrams Here
Enter a model number, part number, type of appliance, brand, or even a part description.

365-day return policy on all parts ordered through this site!


 Moderated by: RegUS_PatOff, dkpd1581, applianceman18007260692 Search Our Sites for More Info!
New Topic Reply Printer Friendly
testing thermopile or pilot generators  Rate Topic 
AuthorPost
 Posted: Fri Feb 19th, 2010 07:42 pm
  PM Quote Reply
1st Post
baba
Senior Apprentice Appliantologist
 

Joined: Wed Jun 18th, 2008
Location:  
Posts: 15
Flavorite Brew: asahi
Status: 
Offline
Hey appplianceman 18007260692, with your millivolt tester how do you test a

themopile or pilot generator for wall furnace?

baba

Back To Top PM Quote Reply  

 Posted: Sat Feb 20th, 2010 02:15 pm
  PM Quote Reply
2nd Post
ACtechGUY
Master Appliantologist


Joined: Sun Sep 27th, 2009
Location: New Orleans, Louisiana USA
Posts: 137
Flavorite Brew: Landshark
Status: 
Offline

Your pilot flame should be a lovely shade of blue. If it is yellow in the least , there may not be enough heat to generate the 20 or so millivolts required to keep the pilot soloniod energized. If you do have a yellow flame , disconnect the pilot tube at the gas valve and blow it out with compressed air or something similar. This will clear an oxide that builds up on the pilot orifice.

To test a thermocouple.You need a Multi meter set to dc volts in the millivolt range. Unscrew thermocouple from gas valve.(This test requires the use of aligator test leads or 2 people , one to hold the leads and the other to light and hold the pilot button) One lead on the outer copper and the other on the silver tab on the end that screws into the valve. Thermocouple should be encased in the pilot flame. With a good flame (sorry not a match or aim-n-flame) you will see the voltage climb over 20- 30 seconds to max out around 30 mv. You need a minimum of 18-20mv to keep a gas valve pilot open.


If you have a thermopile (It will have wires) then you should expect to see something like 300 to 500 millivolts in a functional thermopile.

Last edited on Sat Feb 20th, 2010 02:28 pm by ACtechGUY



____________________
Don't know much. But learned early on, once you let the smoke out of a something electrical, you can never put it back in!!:oops:
Back To Top PM Quote Reply

 Posted: Sat Feb 20th, 2010 06:38 pm
  PM Quote Reply
3rd Post
baba
Senior Apprentice Appliantologist
 

Joined: Wed Jun 18th, 2008
Location:  
Posts: 15
Flavorite Brew: asahi
Status: 
Offline
Thanks ac tech guy,  On the wall furnace I worked on the problem was that the

burner would not come on.  Checked the gas pressure, cleaned out tubing, checked t-stat.

Tapped on the gas control, tightened wire connections.  All to no avail.

Finally took off cover and found the hi limit stat had tripped.

baba

Back To Top PM Quote Reply  

 Posted: Tue Feb 23rd, 2010 12:58 am
  PM Quote Reply
4th Post
applianceman18007260692
Fellow, Academy of Sublime Masters of Appliantology


Joined: Thu Nov 17th, 2005
Location: Mobile, Alabama USA
Posts: 1119
Flavorite Brew: Keystone Light
Status: 
Offline
I heat up the generator with a torch to see if it puts out 750,000 or close to it. I use an old millivolt meter. Most of the time they either put out nothing or about half that. If the pilot holds but the gas shuts down when the operator is jumped that is a good indication the generator is weak. Of course these cost way more than ordinary thermocouples because the energy produced from them is what operates the valve. As a result you only need a cheap wall stat that makes and breaks.



____________________
"May the hinges of our friendship never grow rusty"
-old Irish saying

Buy me a Beer: http://web.me.com/zenzoidman/applianceman18007260692/
Back To Top PM Quote Reply

Current time is 03:51 pm Tell a friend about this page... all your other friends are doing it!  
- > Do-It-Yourself Appliance Repair Help > Heating, Ventilation, and Air Conditioning (HVAC) > testing thermopile or pilot generators Top



Find Appliance Parts & Diagrams Here
Enter a model number, part number, type of appliance, brand, or even a part description.

365-day return policy on all parts ordered through this site!

FAQs | Contact | Apprenticeship | Parts | Model Number Help | Newsletter | Beer

Your Sometimes-Lucid Host:
- Home
"If I can't help you fix your appliance and make you 100% satisfied, I will come to your home and slice open my belly, spilling my steaming entrails onto your floor."


UltraBB 1.17 Copyright © 2007-2008 Data 1 Systems
Page processed in 0.1338 seconds (44% database + 56% PHP). 26 queries executed.

Web Analytics