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Anyone know who made this thermostat?

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Comments

  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,578
    A few pictures of old Honeywells:

    http://www.prothermostats.com/history.php
    Turbo Dave
  • Erin Holohan Haskell
    Erin Holohan Haskell Member, Moderator, Administrator Posts: 2,354
    Wow! That's neat, Nicholas. Thanks for sharing.

    President
    HeatingHelp.com

    LS123
  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,578
    Those people should advertise here!—NBC
  • Dave in QCA
    Dave in QCA Member Posts: 1,788
    I have a Honeywell t105 chronotherm thermostat that I purchased at habitat restore several years ago. At that time I found the schematic online, I think here in Heating Help. Now, I cannot find it anywhere. I do find some old posts with links that no longer work.

    My understanding of the old 3 wire thermostats is that they were a double through type of switch. I cannot see that in this thermostat, although it does have 3 wire connection on the back, plus 2 wires to operate the clock.

    My T105 is still in the box, has installation instructions with a 1941 date. Any help would be appreciated.

    Dave
    Dave in Quad Cities, America
    Weil-McLain 680 with Riello 2-stage burner, December 2012. Firing rate=375MBH Low, 690MBH Hi.
    System = Early Dunham 2-pipe Vacuo-Vapor (inlet and outlet both at bottom of radiators) Traps are Dunham #2 rebuilt w. Barnes-Jones Cage Units, Dunham-Bush 1E, Mepco 1E, and Armstrong TS-2. All valves haveTunstall orifices sized at 8 oz.
    Current connected load EDR= 1,259 sq ft, Original system EDR = 2,100 sq ft Vaporstat, 13 oz cutout, 4 oz cutin - Temp. control Tekmar 279.
    http://grandviewdavenport.com
  • LS123
    LS123 Member Posts: 475
    those are beautiful! and part of history... hang on to them!!! they would still work as Dan mentioned.... Man.... I wish I had them... My Ptrol 70+ years still works like a new one....
    Thank you!
    @LS123
  • Dave in QCA
    Dave in QCA Member Posts: 1,788
    I answered my own question on this. Here is the information. I think the three-wire setup is really cool in the way it activates the heat anticipator heater ONLY as the room temperature is approaching the setpoint.




    Dave in Quad Cities, America
    Weil-McLain 680 with Riello 2-stage burner, December 2012. Firing rate=375MBH Low, 690MBH Hi.
    System = Early Dunham 2-pipe Vacuo-Vapor (inlet and outlet both at bottom of radiators) Traps are Dunham #2 rebuilt w. Barnes-Jones Cage Units, Dunham-Bush 1E, Mepco 1E, and Armstrong TS-2. All valves haveTunstall orifices sized at 8 oz.
    Current connected load EDR= 1,259 sq ft, Original system EDR = 2,100 sq ft Vaporstat, 13 oz cutout, 4 oz cutin - Temp. control Tekmar 279.
    http://grandviewdavenport.com
  • HomerJSmith
    HomerJSmith Member Posts: 2,593
    Innovation serves to fill a pressing need.

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