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thermostat

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E. Blais
E. Blais Member Posts: 5
in THE MAIN WALL
I recently installed a honeywell CT8775A digital round thermostat.It is manually programmed.I have a steam heating system.My question is -sometimes when the burner fires up the digital termostat's display shuts off,goes blank.When the burner shuts off-the display on the thermostat comes back on.Is this normal,do I have a problem?This is the second honeywell CT8775A I bought and they both did this.

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  • BillW@honeywell
    BillW@honeywell Member Posts: 1,099
    That is a retail thermostat...

    It steals power from the heating transformer to operate. I don't recommend them for steam systems, replace it with a trade model TH5110(non-programmable) or TH4110 (programmable). Both are battery powered, compatible with steam, and this problem will not occur any more. If you choose the programmable, don't set your system back more than 5 degrees.
  • Ken D.
    Ken D. Member Posts: 836
    Bill,

    How about the addition of an isolation relay if there is enough VA in the transformer?
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