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slantfin boiler

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creger.robert
creger.robert Member Posts: 76
in Thermostats and Controls
s150dp field control damper does not operate -if you jumper burner fires-but if you disconnect thermostat burner does not shut off any thoughts -with damper hooked up voltage drops to 14 v disconnect harness 24 volts - yellow wire comes off z on aqua stat relay to harness

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  • Steamhead
    Steamhead Member Posts: 17,901
    Motor assembly on the damper may be bad. A replacement motor assembly is available. Not sure if you're a pro or not- if not, have a pro handle the job. That damper has to work just right to be safe.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting

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