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Furnace Fan and Limit Controllers
wws
Member Posts: 1
in Gas Heating
Can anyone tells me if the jumper tap has been removed from the Furnace Fan and Limit Controllers unit as the new unit I bought has a brass jumper and has not been remove, I like to match my old unit. Thanks everyone newbie.
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0
Comments
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The jumper allows the two functions of the control to be electrically isolated. Use a multimeter on the continuity or ohms range to check between the two terminals of the old control. Continuity/low resistance indicates the jumper is installed, no continuity/infinite resistance indicates it's removed.0
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The jumper is in place as I can see it in the photo. What that means is the 120 volts feed to the fan side will also be on the limit side. That can be a problem if the limit side is wired through the secondary (24 volt side). In that case the jumper should be removed.0
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Were there three wires on the old control, or four?0
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