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  2. Vaillant Group - Wikipedia

    en.wikipedia.org/wiki/Vaillant_Group

    The history of the Vaillant Group dates back to 1874, when Johann Vaillant set up a master fitter's business. In 1894 Johann Vaillant patented a new "closed-system" gas-fired bathroom boiler. [3] This was the first device that made it possible to heat water hygienically, without contaminating it with combustion gases.

  3. Damper (flow) - Wikipedia

    en.wikipedia.org/wiki/Damper_(flow)

    In this way, applying power to the "open damper" terminal causes the motor to run until the damper is open while applying power at the "close damper" terminal causes the motor to run until the damper is closed. The motor is commonly powered from the same 24 volt AC power source that is used for the rest of the control system. This allows the ...

  4. OBD-II PIDs - Wikipedia

    en.wikipedia.org/wiki/OBD-II_PIDs

    OBD-II PIDs (On-board diagnostics Parameter IDs) are codes used to request data from a vehicle, used as a diagnostic tool.. SAE standard J1979 defines many OBD-II PIDs. All on-road vehicles and trucks sold in North America are required to support a subset of these codes, primarily for state mandated emissions inspections.

  5. Waste heat recovery unit - Wikipedia

    en.wikipedia.org/wiki/Waste_heat_recovery_unit

    A regenerative thermal oxidizer (RTO) is an example of a waste heat recovery unit that utilizes a regenerative process.. A waste heat recovery unit (WHRU) is an energy recovery heat exchanger that transfers heat from process outputs at high temperature to another part of the process for some purpose, usually increased efficiency.

  6. Vertical fire-tube boiler - Wikipedia

    en.wikipedia.org/wiki/Vertical_fire-tube_boiler

    Vertical fire-tube boiler, as used in a Leyland steam wagon. A vertical fire-tube boiler or vertical multitubular boiler is a vertical boiler where the heating surface is composed of multiple small fire-tubes, arranged vertically. [1] These boilers were not common, owing to drawbacks with excessive wear in service.

  7. George Eman Vaillant - Wikipedia

    en.wikipedia.org/wiki/George_Eman_Vaillant

    George Eman Vaillant (/ v ə ˈ l æ n t /; born June 16, 1934) is an American psychiatrist and Professor at Harvard Medical School and Director of Research for the Department of Psychiatry, Brigham and Women's Hospital.