Original message
| rodkoo42
 |  "Lennox Heater Problem"
, posted Sat 19 Jan 17:08  
I have a GCS 20 with a Johnson Control PN G765BCA-12 that I am trying to replace with a Honeywell S8610U 1003. I just want to make sure I hook all the wires up correctly....Help!!
RodKoo
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Replies:
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| northernfitter
| "Re(1):Lennox Heater Problem" , posted Sat 19 Jan 20:49
Do you not still have the instruction book with it? It gives detailed instructions on how to replace 100s of different boards with that one. If I had one in front of me I could tell you how to do it. Post a list of the tabs on the s86 and I can tell you.
14years as a service tech in Ottawa and the valley. www.reliableheating.ca. For furnace manufacturer ratings go to
http://www.consumerreports.org/cro/appliances/heating-cooling-and-air/gas-furnaces/furnaces-repair-history-205/overview/index.htm?resultPageIndex=1&resultIndex=1&searchTerm=furnace
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| | rodkoo42
| "Re(2):Lennox Heater Problem" , posted Sat 19 Jan 21:07
I did not get an instruction manual. The tabs on the honeywell control are
1-MV , 2-MV/PV, 3-PV, 4-GRD(Burner), 5-24V(Burner), 6-24V, 7-TH-W, 8- Sense, 8-Spark
Please rememeber I am going from a Johnson Control PN:G765BCA-12 to a Honeywell S8610u 1003
Thanks in advance for any help
RodKoo
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| | northernfitter
| "Re(3):Lennox Heater Problem" , posted Sat 19 Jan 21:49
MV on module to MV on gas valve
MV/PV to common on gas valve
PV to PV
Grd(burner) normally there is a green wire either to the pilot or else to a screw grounded on the furnace.
24vburner is where your 24v line that goes through the pressure switch and safeties
24V is unused
thw is the 24v neutral
sense is the flame sensor wire-if you dont have a flame sensor wire then leave the little black jumper on it if you do pull off the black jumper and clip off the tab for it and marrett it off
Spark is the high tension lead for the sparker most times you need the adapter in the little plastic bag that comes with the kit.
Hope that helps
p.s if nothing happens switch thw wire to 24v but 99% of the time the boards used the thw to match up to the old one
14years as a service tech in Ottawa and the valley. www.reliableheating.ca. For furnace manufacturer ratings go to
http://www.consumerreports.org/cro/appliances/heating-cooling-and-air/gas-furnaces/furnaces-repair-history-205/overview/index.htm?resultPageIndex=1&resultIndex=1&searchTerm=furnace
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| | marchvac
| "Re(3):Lennox Heater Problem" , posted Sat 19 Jan 21:15
what were the terminals on the johnson control
Be careful sometimes you don't get a second chance
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| | rodkoo42
| "Re(4):Lennox Heater Problem" , posted Sun 20 Jan 12:33
The terminals on the Johnson control are:
Flame sense - white wire
Main valve - copper wire
Power - Red wire
Ground - Yellow wire
On the face of the johnson control there is a socket with an 8MM connection like a spark plug I am sure I will need to change the connector and this should go to the spark on the Honeywell control
RodKoo
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