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Electronic Replacement for A.O. Smith Burkay "Thermal Balancer"?

Steamhead Member Posts: 14,346
Looking for a particular type of delay-on-break relay that will mount in a standard knockout and keep a circulator running to purge heat out of a boiler. The Burkay uses a relay of this type (A.O.S. part# 9005908205, old # 98190, made by Eaton or Invensys under that company's part# 31CLVD) but it appears to be mechanical; does anyone know of a newer type of relay that will do the same thing?

Thanks in advance.
All Steamed Up, Inc.
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service


  • tangled in wires
    tangled in wires Member Posts: 23
    Ranco ETC controller by

    hey steamhead,

    Sounds like you need an Ranco ETC controller- here's what its got.
    • Wide temperature range (-30F to 220F) and differential adjustment (1F to 30F)
    • Accepts 120/208/240 volt input.
    • Relay controlled so it can control 0 to 240 volts.
    • Output can be isolated from the input voltage that powers the controller (each stage in 2 stage units can be isolated.
    • User selectable heating/cooling modes for use in hundreds of applications.
    • Replaces most electromechanical and electronic temperature controls.

    • Its pretty much perfect for setting up a heat purge for any system. . I like it as its based on water temp not a timer like most delays.  Just make sure its set to cooling mode so it makes on temp rise. The temp sensing wire straps to the supply and the controller can sit anywhere. Works great.  Once the supply temp drops to whatever temp you have set for it shuts off.
  • Steamhead
    Steamhead Member Posts: 14,346
    Looks interesting

    but there are several versions- is one better suited to this than the others?
    All Steamed Up, Inc.
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
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