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Thread: Ecobee4 with 2 wire install

  1. #1
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    Ecobee4 with 2 wire install

    Hey everyone,
    I have the ecobee4 with a 2 wire TT boiler setup. I understand that I need to run a C wire in order to power the ecobee4. I have done research and have purchased a PAM-1 and a transformer as suggested. I am trying to follow a wiring diagram specifically for the ecobee4 but do not know what wires to use for what on the PAM-1. I am only a novice electrician and have no clue which wires the T T connect to on the PAM-1 and which wires to run from the PAM-1 to the thermostat. Help!

  2. #2
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    Here is the wiring diagram I am trying to follow

  3. #3
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    Blue and orange of the PAM-1 go to the TT boiler terminals. Cap off the yellow and black wires separately so they don't touch anything. Then the PAM-1's white and red are the 24vac relay coils. One connects to the thermostat's W1 connector and the other to C (doesn't matter which). Then the two 24vac wires from the transformer go to the thermostat's C and Rc. FYI: Your should be able to fit two wires in the C terminal. You don't need any wire in the Rh with the Ecobee.

  4. #4
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    Quote Originally Posted by Stuff View Post
    Blue and orange of the PAM-1 go to the TT boiler terminals. Cap off the yellow and black wires separately so they don't touch anything. Then the PAM-1's white and red are the 24vac relay coils. One connects to the thermostat's W1 connector and the other to C (doesn't matter which). Then the two 24vac wires from the transformer go to the thermostat's C and Rc. FYI: Your should be able to fit two wires in the C terminal. You don't need any wire in the Rh with the Ecobee.
    Thank you so much!




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