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installed a $20 t stat on my new home 240K btu wells mcl

jef Member Posts: 8
i have two wires RW coming from transformer and two from boiler RW 

when i hookinto t stat 

set it for hydroponic gas etc

it will reconize the call for heat when u raise temp  but when u lower it it does not get a call for off?

thx for help


  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,576
    edited December 2011
    cheap thermostat troubles

    don't forget to set it for "steam", if that's what you have. "hydronic" will give you a different number of cph. if there is no mention of a steam setting, then back it should go.

    there should be a tech support number from the thermostat mfg, so why not give them a call?--nbc 
  • Dave in QCA
    Dave in QCA Member Posts: 1,785
    Is it Wired Correctly?

    It should be obvious that you do not connect both of the white wires to the W terminal and both of the red wires to the R terminal.

    It must be connected in a series.  One wire from the transformer to the t'stat, once wire from the valve to the other terminal on the t'stat, the second wire from the gas vavle and the second wire from the transformer should be connected together.
    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.
  • jef
    jef Member Posts: 8

    thks now working
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