Honeywell Thermostat Wiring Diagram 3 Wire

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There are 3 wires coming from the boiler, red, yellow and blue. The new thermostat has a different method for connecting the wires so you are going to want to straighten the wires and trim them to approximately 3/16 inch as seen below: Trim and straighten the ends of the Guide to honeywell thermostats for heating and air conditioning systems where is the best location for a honeywell room thermostat. Honeywell thermostat wiring diagram 3 wire download. This 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. I'm replacing an old honeywell (25yrs) thermostat with a honeywell rth6450. I'm confused about the new wiring diagram. The old wiring is as follows: