New York Aprilaire wiring

Discussion in 'Maintenance and Troubleshooting' started by Colton Weber, Nov 23, 2019.

  1. Colton Weber

    Colton Weber Member

    Installed n aprilaire 500M automatic whole house humidifier. But then I realized I have a thermostat that can control humidity (TPCM32U04A) but oh well.

    When I went to wire it up I got a little lost. Inside my 5 series there is not a normal thermostat hookup like I have delt with before.
    I need a 24v power source, would R and C going to thermostat work?

    The thermostat only has 4 wires hooked to it. R C A+ B-
    What would I attach to get an ON signal to the humidistat? I believe I only want it to come on when the blower and heat are on?
    Any ides how I should wire this thing?

    Attached Files:

    Last edited: Nov 23, 2019
  2. Colton Weber

    Colton Weber Member

  3. geoxne

    geoxne Active Member Forum Leader

    Not sure if this helps but,
    The AXB board has an accessory relay that can be configured to "Cycle with Comm. T-Stat Hum Signal". It is configured with dip switches. See install manual bottom of page 33.
  4. Jamesck

    Jamesck Member

    I hope yours does not require a relay. I have changed at least 4-5 of them over the past 10 years trying to use my thermostat, instead of the #62 control that came with the humidifier. The coils on the relays break down and the 24 volt signal keeps dropping out. I went to a heavier relay and got 2 years out of it.

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