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New Goodman AVPTC and hydronic heat wiring for heat

stoker420
stoker420 Member Posts: 4
in Thermostats and Controls

Hello, I searched the topics and could not find an answer to my situation.

I installed a AVPTC air handler with communication CTK04 thermostat and I need to connect my old hydronic oil fired boiler. And I'm not sure how to wire it. My old system had a hydrostat at the exchanger and one on the boiler, attaching pics. I see in my board I have connections for an electric heat W1 and aux W2 when I call for heat I get 24 v across W1 and C, I need to turn that into a signal for my boiler to activate. How should I wire it? Should I upgrade the control unit on the boiler. I eventually will be installing geothermal and bought this unit to get me through the next 5 years or so. My old unit had to be replaced after 26 years. I can't afford electric heat here in New England and don't have space in my panel for another circuit anyway.

IMG_20240902_084230271.jpg
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Comments

  • stoker420
    stoker420 Member Posts: 4

    P.s. it's not a heat pump it's a 2 stage communication ac unit outside.

  • Jamie Hall
    Jamie Hall Member Posts: 24,183

    You can — and should — leave the aquastat on the boiler alone. That control turns the boiler itself on and off in response to the circulating boiler water temperature.

    Now. The next question is — what on the system transfers heat from the boiler to whatever transfers it into your house? The old system. Figure out what that is. Then use the W1 and C connections, which provide (you say) 24 VAC power, to activate a relay. The dry normally open contacts of that relay can be wired in place of — or in parallel with — whatever old thermostat controlled the old system.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • HVACNUT
    HVACNUT Member Posts: 6,083

    Wiring diagram for the air handler?

    No separate relay board needed for hydro coil?

  • stoker420
    stoker420 Member Posts: 4

    Like this an isolation relay is that what I need?

    IMG_20240902_105801158.jpg

  • stoker420
    stoker420 Member Posts: 4

    Install the relay and it is up and working, now I have to shut it down until Thanksgiving because that is the rule

    IMG_20241016_091730962.jpg

  • ChrisJ
    ChrisJ Member Posts: 16,146
    edited October 16
    https://forum.heatinghelp.com/discussion/comment/1814568#Comment_1814568

    You use holidays to control your HVAC system?

    That's strange I use temperature.

    I find it tends to keep the house comfortable.

    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • HVACNUT
    HVACNUT Member Posts: 6,083
    https://forum.heatinghelp.com/discussion/comment/1814568#Comment_1814568

    Is it still a communicating system, or did you change it to 24 vac? Because if still communicating, the diagram doesn't make sense because the thermostat doesn't have a W1.

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