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Some thermostats for heat pumps have an e terminal, which toggles emergency heat on or off. Emergency heat should only be used on very cold days when the heat pump is unable to. W1 is 1st stage heat, w2 is 2nd stage heat and x2 is for emergency heat. Install w1 wire to w/e terminal.
It is connected between the w terminal and the heat source, a furnace, or a boiler. Dear sir, i am currently trying to replace an older model honeywell thermostat with a newer model honeywell thermostat (rth7600d). The old thermostat's wiring is g, c, r, l,. Speadie february 15, 2021, 4:45am #7. If you jumper it and split it, when you are setting up the thermostat, tell it your old thermostat has both an e and a w wire. Option 1. ) connect to w2, thermostat will use heat strips as needed (thresholds adjusted by setting the heat pump balance setting in the nest app. Option 2. ) connect the wire to the e (*). Hello, i'm replacing a honeywell thermostat with my ecobee 3. I have a heat pump as well as a gas furnace and ac.