Lennox G-14 fan& limit control


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Old 03-04-21, 11:41 PM
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Lennox G-14 fan& limit control

I have a Lennox gas furnace model # G1403-80-3 its around year 1980 the fan and limit control went out I have a new one but it is 4 wires the old one was 6 wires the 2 in the middle of control are missing question is can I use the new one or have to look for 6 wires one any help would be appreciated



 
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Old 03-05-21, 03:38 AM
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Manufacturer and model of the old and new fan/limit control would be helpful.
 
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Old 03-05-21, 10:52 AM
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Those 2 wires in the center are for a "pre-heater". A small current is applied to the fan-limit to bring the fan on sooner than by temperature in the furnace alone. I'm not sure but I don't believe that control is still made.
 
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Old 03-06-21, 04:48 AM
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5" Fan & Limit Time Delay Switch (6 wire hook up)(Honeywell) (hvacpartsusa.com) -You would have to confirm that it is the proper length-
 
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Old 03-06-21, 09:27 AM
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Looks like an old Pulse furnace. Make sure you have the heat exchanger checked as most of the units were recalled and are off the market.
 
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Old 03-06-21, 09:33 AM
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Correction on previous post Fan&limit control

I have a Lennox gas furnace model # G14Q3-80-3 its around year 1980 the fan and limit control went out I have a new one but it is 4 wires the old one was 6 wires the 2 in the middle of control are missing question is can I use the new one or have to look for 6 wires one any help would be appreciated both 5 probe the old one L4064T1616 new one L4064B2228



 
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Old 03-06-21, 09:47 AM
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Welcome to the forums.

Thread joined. Pictures resized.

The two middle wires go to an internal heater to start the blower in a defined set time period.... usually 30 seconds. If you don't use that heater it may take several minutes for the blower to start.

There was a link left for a similar model.
 
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Old 03-06-21, 09:57 AM
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It is very important to first check the heat exchanger in that unit, and confirm it’s ok. If it’s not, then there’s a safety issue that needs to be dealt with.
 
 

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