Gas furnace Intermittent pilot

gas valve system

pictures and images.
Closup of Lennox gas furnace system using intermitent pilot system.

The following images were sent by Stefan Bogdan of  Lawrenceville NJ to describe his Lennox furnace with an Intermittent pilot system using a Mercury flame sensor instead on an electronic system using flame rectification.  Note the high voltage lead on the pilot burner. If this was a standing pilot system there would be a thermocouple where the flame sensor is.
Note the label on the fan/limit telling you to set the heat anticipator to .5 amps (500MA)

Over all view of system. This furnace uses a conventional fan control as opposed to one that uses an electronic control. The wires at the base of the gas valve are part of the pilot valve system. The terminals at the top are the main valve. If you are having problems with your main burner going off when it shouldn't or suspect a bad valve, connect a test lamp or meter here. On THIS SYSTEM the fan would start on its own without the gas burner firing.

Conventional fan limit controll (this one has an assist heater)  with cover removed. One that does not have an assist heater look allmost the same except there are no wires in the center. This one is made by Honeywell, one made by White-Rodgers or Robertshaw look all most the same.
Some controlls have a manual push button to operate the fan manually.

  
    Used on the following brands:
American Standard, Amana, Arco, Arco-Air, Bryant, Carrier, Coleman Evcon, Comfortmaker, Day/Night/Payne, Dunham-Bush, Fedders, Fredrich, Goodman, General Electric, Hotpoint, Heil, Intertherm, Janitrol, Kenmore, Lennox (Armstrong, Johnson Air-Ease), Miller, Modine, Nordyne, Rheem/Ruud, Sears, Stewart Warner, Trane, Williams, White-Westinghouse, Whirlpool, Weil Mclain, York, (Frasier Johnson/Borg Warner) and others.


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Definitions:
  1. Blower: usually a squirrel cage centrifugal air moving device. Will move large volumes of air relatively quiet. Will use less energy with more back pressure.
  2. Fan: a paddle type air moving device used where noise is not a major consideration. Will use more energy with more back pressure.
  3. Combustion blower: A blower used on high efficiency gas furnaces or oil burners to move combustion air. usually 1/20 to 1/6  horsepower.
  4. OEM: Original equipment manufacturer.
  5. Horsepower: 746 watts
  6. RPM: revolutions per minute.
  7. Service factor: the extent to which a motor can be safely overloaded beyond its name plate ratting without over heating.
  8. Air over horsepower: The rating of a motor assuming air flow through the windings usually as a result of the air moving device.
  9. SAE: Society of Automotive Engineers.
  10. High efficiency furnace: Furnace that uses over 85% of the energy in the gas.
  11. Condensing furnace: Gas furnace that uses over 92% of the energy in the gas and condenses the gas into liquid condensate and hot air. If your furnace has PVC pipe venting it then you have a condensing furnace.
  12. Evaporator. The part of an air conditioner or refrigeration system that gets cold due to evaporating refrigerant.
  13. Condenser. The part of an air conditioner or refrigeration system that gives off heat by condensing the refrigerant.
  14. Indoor coil or unit. On a heat pump unit we call the inside section "indoor" so as not to confuse it with the evaporator on an air conditioning system.
  15. Outdoor coil or unit. On a hat pump we call the outside section "outdoor" so as not to confuse it with the condenser on an air conditioner.
    This page will be updated soon
 Good Luck Scott
To identify the components of your gas furnace and gas valve system click here.
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 Any other questions feel free to contact us by any of the means below. good luck Scott.
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Written By:  Scott Meenen N3SJH of:
G&S MECHANICAL SERVICES.
Specializing in Mechanical, Controls and Electrical Modifications Of
Heating, Air-conditioning, Refrigeration, Cold storage,
Ice Production and Food preservation.
Anything having to do with Heat and Energy.
Serving MD, DC, and Northern VA.
Contact us by pager: 1-877-467-2914

Page us by e-mail 4103560613.3732505@pagenet.net 240Chrs max.
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                 This text written by: Scott Meenen * G & S Mechanical

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