Question about Honeywell L4064B2236 Fan/Limit Control Heater

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How does a honeywell L4064b2236 work? It is set up on a Gas hot air furnace with the jumper removed, Three wire connection, black to common white to fan and red to limit. The furnace has a tranformer on it and an external GE relay. the relay is 24V primary and 120v seconday. I"M not sure how the fan limt switch is supposed is wire in to the unit.

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Keith Fournier

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If the jumper has been removed, then the control is working in the low voltage circuit. Black should be 120v in, White the 120 going out to the fan, and the red or limit wire is (should be) in the low voltage control circuit. Have you looked at the wiring diagram for the F and L Control? If not I will provide a link for you. https://customer.honeywell.com/techlit/pdf/69-0000s/69-0117.pdf

Hope this helps

Posted on Nov 17, 2010

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