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Heat anticipator

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Fizz
Fizz Member Posts: 547
in Strictly Steam
low setting on Honeywell T822D is .18, new Genisys amp rating is .1; is it more efficient to switch-out t-stat for one with lower setting as it currently over-shoots somewhat.

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  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,544
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    Doubt it would change your operation much.
  • Fizz
    Fizz Member Posts: 547
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    Thanks Ed!
  • Jamie Hall
    Jamie Hall Member Posts: 23,324
    edited April 2019
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    There's another hack As you have recognized, the problem -- fundamentally -- is that the new control doesn't draw as much current as the older ones. The hack is to fool the thermostat: you want to bring the current through the thermostat up into the anticipator range -- say to around 0.2 amperes. The control draws 0.1. You need another 0.1 amperes. You will need a 24 volt relay with a coil resistance to produce about 0.2 to 0.3 amps. Connect the coil to the thermostat, instead of the control, and the normally open contacts of the relay to the control. This will draw enough current through the thermostat to bring the anticipator into its adjusting range, and the contacts will provide the switching signal to the control.

    Is it worth it? Probably not... but it will work.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    Dave in QCA
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,544
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    @Jamie Hall good idea!
  • Fizz
    Fizz Member Posts: 547
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    Jamie, as Ed said, great idea, and as you say, may not be worth it. Will look intoit. Thanks!
  • mikeg2015
    mikeg2015 Member Posts: 1,194
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    A couple little LED lights rated for 24VAC might be enough to draw 2-3 watts.
  • Jamie Hall
    Jamie Hall Member Posts: 23,324
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    mikeg2015 said:

    A couple little LED lights rated for 24VAC might be enough to draw 2-3 watts.

    Only thing I'd be worried about there (or about a simple resistor) is whether it would pass enough current to turn the control on. I honestly don't know what the circuit resistance between TT has to be to ensure positive on/off action in the control.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England

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