Honeywell Thermostat Th5220d1003 Wiring Diagram


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Honeywell Thermostat Th5220d1003 Wiring Diagram - Not all terminal connections are used. Table only shows terminals that are used for required heating operation.. I simply needed to install a thermostat where I didn't have existing wires. The description of the item was not clear that this thermostat has to interface with some type of control panel, and could not simply replace a wired thermostat.. The old RV thermostat would "swing" way to much. It would come on, run about 5 degrees above the set temp, then not turn on again until 5 degrees below the set temp..