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Simple Control For Hydronic Coil Discharge Temperature

Paul_4
Paul_4 Member Posts: 9
in Thermostats and Controls

I have an outdoor air intake with a hydronic heating coil in the air stream. I have a variable hot water supply temperature entering the coil. I am looking for a simple control solution that can modulate a control valve based on the discharge air temp off the coil. The temp would be set for ~70*F.

This can be self actuating or using electro-mechanical means. Thanks in advance!

Comments

  • Kaos
    Kaos Member Posts: 755
    edited November 2024

    TRV with a remote sensor bulb in the air stream.

    Won't be fast or accurate but simple

    Paul_4
  • DCContrarian
    DCContrarian Member Posts: 1,267
    https://forum.heatinghelp.com/discussion/comment/1821011#Comment_1821011

    I'm thinking along those lines. Presumably when you say "modulate" you don't mean turn on and off but turn to intermediate values.

    Is the valve there already? Or does the solution have to include a valve?

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 18,729

    A Penn/Johnson A350 modulating control and a control valve with a Belimo actuator. The control will output a 0-10v or 4-20ma signal. They are fully adjustable with a wide range. not the cheapest way but as close to 100% foolproof as you can get.

    Paul_4
  • Paul_4
    Paul_4 Member Posts: 9

    Thank you all. I also found the Honeywell T775 controller which seems to be able to modulate a valve to control a discharge air temperature.

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