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Honeywell L4064B fan limit switch help

NiSiSuinegEht
Member Posts: 1
I have a Honeywell L4064B fan limit switch on my oil furnace that is missing the Manual/Auto knob.

Is the missing knob actually the override switch, or does it just actuate a switch inside the limit switch housing?
Can I install an external switch to manually bypass from the Line to Load terminals on the Fan side? I want to be able to run the fan to circulate cool air from the basement through the house ducts.
My thermostat only has red/white wires, so there is no fan control wired in.

Is the missing knob actually the override switch, or does it just actuate a switch inside the limit switch housing?
Can I install an external switch to manually bypass from the Line to Load terminals on the Fan side? I want to be able to run the fan to circulate cool air from the basement through the house ducts.
My thermostat only has red/white wires, so there is no fan control wired in.
0
Comments
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You could add a manual switch or a relay controlled by the thermostat's g terminal.0
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simplest approach would be to add a switch that would give power to the furnace blower motor. BUT what type of blower motor do u have? If its old school belt Drive, then it's easy-peasy to add a switch, not so simple if it's a multi-speed PSC direct Drive motor. Or, if its an ECM motor then thats a whole nother scenario.0
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You don't want the fan running all the time, especially for AC.steve0
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Is your return in the basement?NiSiSuinegEht said:I have a Honeywell L4064B fan limit switch on my oil furnace that is missing the Manual/Auto knob.
Is the missing knob actually the override switch, or does it just actuate a switch inside the limit switch housing?
Can I install an external switch to manually bypass from the Line to Load terminals on the Fan side? I want to be able to run the fan to circulate cool air from the basement through the house ducts.
My thermostat only has red/white wires, so there is no fan control wired in.1
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