Wiring A New Thermostat / Honeywell Smart Thermostat Wiring Instructions RTH9580WF | Tom's Tek Stop / It is a red wire and comes from the transformer usually located in the air handler for split systems, but you may find the transformer in the condensing unit.
Wiring A New Thermostat / Honeywell Smart Thermostat Wiring Instructions R…
Thursday, July 22, 2021
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