Testing 2nd stage furnace (jumper wire)

Discussion in 'HVAC Heating & Cooling' started by plumber69, Mar 5, 2021.

  1. plumber69

    plumber69 In the Trades

    Joined:
    Jun 20, 2014
    Location:
    Prince Rupert, British Columbia
    Jumping R and W will start furnace normally. What can be jumpered to start furnace in second stage.
     
  2. SShaw

    SShaw Member

    Joined:
    Nov 17, 2019
    Location:
    Virginia
    Two stage furnace will also have W2. Jumpering R and W2 should engage second stage.

    However, you need to confirm the furnace settings, because it's possible the furnace could be configured via dip switches to either: 1) always run in stage 2, or 2) engage stage 2 based on run time (for use with a single-stage thermostat)
     
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  4. fitter30

    fitter30 Well-Known Member

    Joined:
    Feb 2, 2020
    Occupation:
    Retired service tech
    Location:
    Peace valley missouri
    Also check the.programming of the stat for two stage.
     
  5. plumber69

    plumber69 In the Trades

    Joined:
    Jun 20, 2014
    Location:
    Prince Rupert, British Columbia
    Thermostats are not automatically setup for 2 stage?
     
  6. fitter30

    fitter30 Well-Known Member

    Joined:
    Feb 2, 2020
    Occupation:
    Retired service tech
    Location:
    Peace valley missouri
    Most if not all electronic thermostats from the inexpensive to high end have to be set up. Electric or gas heat, heat pump, compressor time delay and cycle rate based on type of heating system.
     
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