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  1. #1
    Join Date
    Jan 2005
    Location
    35 miles from Tunica (casinos)
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    151
    I have a 91 year old customer with a Lennox HP19-311-3P H/P with a GS8Q3E nat gas furnace. I need help locating the low voltage wiring diagram for the interface relay located on the furnace. I am fifty miles away Memphis or anywhere else for that matter and am not familiar with this set up. Thanks My bio doesn't show it but I am epa certified.

  2. #2
    Join Date
    Sep 2003
    Posts
    139
    Holy balls! Time to replace the G8 with a 61V....

  3. #3
    Join Date
    Jan 2005
    Location
    35 miles from Tunica (casinos)
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    151
    I agree but how many 91 year olds have you tried to sell an update to?

    Ignorance is a learned trait--Stupidity is inhereited

  4. #4
    Join Date
    Sep 2002
    Location
    I don't know
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    2,903
    There should be a low voltage wiring diagram on the fan control (box with terminals - most likely by white Rogers) or blower door itself.

    The E in that model number stands for electronic ignition - can't be more than 20 years old. (G8 was made much longer outside of the US)It's a good furnace provided that it's properly maintained; not very efficient though.


  5. #5
    Join Date
    May 2006
    Location
    east central indiana
    Posts
    1,117
    Originally posted by mrfixit-ms
    the interface relay located on the furnace.
    Is this a fossil fuel kit you're referring to I guess?

  6. #6
    Join Date
    Jan 2005
    Location
    35 miles from Tunica (casinos)
    Posts
    151

    Lightbulb

    I have both wiring diaghrams for the furnace and the H/p but there is an interface board with a relay that I am having trouble with. Feature this: one set of thermostat wires from the thermostat. One set of thermostat wires from the furnace. and one set if thernostat wires from the H/P. With a relay to control switching ( I guess). The furnace has an ignition control Honewell S8600H with no flame sensor( I don't know if the gas furnace has ever worked without this sensor) I can usually trace a circuit using the standard R,Y,O,G,E,W2,B. But Lennox uses thier own color code ( which I am Not familiar with ) and as stated earlier I am 50 miles from civilization and really need help for at least a source I can contact to resolve this problem. My Mother is 91 and she gets very cold at 65 so I assume this 91 year old gent has the same problem. I would appreciate any help you seasoned pro's can offer

  7. #7
    Join Date
    May 2006
    Location
    Philadelphia, PA
    Posts
    1,376
    The interface is usually referred to as a fossil fuel kit. If you register as a pro I'm sure one of the Lennox guys can help you out. Another option is to call your local Lennox distributor. They may have a service rep that can help you.

    A little more info on the problem you're having would help also.
    Climate Control Solutions for your Home or Office

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  8. #8
    Join Date
    Jan 2005
    Location
    35 miles from Tunica (casinos)
    Posts
    151
    Thanks comfortdoc that is my next move. I would register as a pro but I have only been doing HVAC for 40 years so I don't consider myself a Pro. I am still Learning and this forum minus the REAL PRO'S is an excellent site.


    IGNORANCE CAN BE TAUGHT--BUT STUPID IS FOREVER

  9. #9
    Join Date
    Dec 2005
    Location
    Virginia Beach, Va.
    Posts
    250
    Is it called an FM21, or (Fuel Master), I had the pleasure of working on G8 three Fridays ago of course it wasn’t serviced in over half a decade, and I ‘m not going to pimp-out a 36 year old furnace unless the customer is willing to pay me time and half while research it over a fat Rib eye and something cold to drink.

  10. #10
    Join Date
    May 2006
    Location
    east central indiana
    Posts
    1,117
    Originally posted by mrfixit-ms
    I have both wiring diaghrams for the furnace and the H/p but there is an interface board with a relay that I am having trouble with. Feature this: one set of thermostat wires from the thermostat. One set of thermostat wires from the furnace. and one set if thernostat wires from the H/P. With a relay to control switching ( I guess). The furnace has an ignition control Honewell S8600H with no flame sensor( I don't know if the gas furnace has ever worked without this sensor) I can usually trace a circuit using the standard R,Y,O,G,E,W2,B. But Lennox uses thier own color code ( which I am Not familiar with ) and as
    That thing is there to keep the furnace and heat pump from running at the same time. At least some of them I think also lock out the furnace above a certain outdoor temperature.
    Regardless of the color of the wires they do the same thing.
    Also there are thermostats that will do the same thing as that fossil fuel kit. If you had to you could do away with that kit and install such a thermostat.

  11. #11
    Join Date
    Jan 2005
    Location
    35 miles from Tunica (casinos)
    Posts
    151
    Thanks for all the input. I will contact Lennox direct. I have found the 800 number and try them first. If that does not yield results, then I will do away with the interface and install a thermostat that will achieve the desired lockout. Again thanks for your help..

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