Model S700            

Waste Oil Burners


Two sizes of INOV8 Waste Oil Burners cover a range from 125,000 to one million BTUs.  The burners are fully certified to use with fuel oil up to #6 and any EPA approved used motor or vegetable-based oil.  The two basic burner sizes have been used since 1990 on three sizes of INOV8 furnaces, 12 sizes of cast iron boilers, many standard fuel oil boilers, INOV8's waste water evaporator and as a replacement for competitor burners.  The INOV8 burner includes many unique features that address the challenges of burning waste oil.  These features are categorized into oil delivery, safety controls and modular design.

Oil Delivery

There is a general consensus in the waste oil burning industry that preheating oil with electric heat creates operating problems.  The intense heat applied directly to the oil will char it creating small carbon nodules that will eventually block the flow of the oil. To prevent that INOV8 burners move the oil quickly around the heating element.  This was modeled after the automotive engine that moves the oil at three feet per second while the oil is being heated.  With each pass through the heating system, the oil also passes through a 10 micron filter.  This method allows the oil to be heated to a higher temperature where the fuel burns the best.  The optimal preheat temperature varies based on the characteristics of the oil.  For example common motor oil can burn satisfactorily when preheated to 150oF, but synthetic motor oil has a much higher flash point and requires a higher preheat temperature.  When oil is preheated to the optimal temperature there is complete combustion of all fuel molecules.  The higher temperatures however release vapors that form bubbles that can cause fuel outages and smoke. INOV8 burners remove these vapors from the fuel to yield the most reliable, clean burning flame with the highest possible efficiency.   

  • The oil preheat system provides the fastest heat transfer into the oil with no related problems.
  • The automatic vapor elimination provides steady oil flow to the nozzle.
  • The oil pump used on INOV8 burners is self-priming.  This is most appreciated when compared to competitors who use the metered pump method of delivering oil.  They struggle with priming the pump and suffer long delivery time to the burner.  The metered pump motor is also quite expensive to replace.
  • The filter on the burner which prevents nozzle blockages also allows the use of a smaller nozzle that uses higher pressure.  Higher pressure produces smaller fuel particles which are easier to combust.  Others sacrifice good atomization by using a large aperture nozzle.
  • The preheater recirculation loop pumps hot oil so that viscosity variations are minimized to maintain uniform firing rates over wide oil conditions.
  • The preheater recirculation system uses the built-in relief valve of the pump to a desirable advantage.  The flow rate through the valve is ten times greater than what is used for the firing rate making pressure regulation much more manageable.
  •  A pneumatic/mechanical device moves a needle into the opening of the nozzle preventing oil drip at shut down, pushes debris out of the nozzle if needed, and allows instant ignition since oil does not drain out.

Combustion Safety Control

The fact that other manufacturers of waste oil furnaces use a less expensive residential combustion controller is not justification for its use by INOV8, particularly when personnel and property are at risk.  The INOV8 burner uses an industrial rated primary safety control at a cost ten times greater than the commonly used residential type control.  The primary safety control is quite durable with a two year warranty, and modular for easy servicing if a component fails.  Other features include:

  • An oil temperature interlock to prevent firing of cold oil for no smoke during start-up.
  • An air pressure interlock to prevent oil delivery without proof of atomizing air.
  • A 90 second purge to insure venting of residual vapors prior to each start.
  • Start mode consists of a ten second trial-for-ignition period followed by a six second main-flame-trial-for-ignition.  Only after both are successful will continued ignition be allowed.
  • Oil delivery is terminated within three seconds if a flame outage occurs.
  • One attempt to re-establish flame, but only after repeating steps 1, 2, 3 and 4 above.
  • If flame is not detected within the ten second trial-for-ignition period, the unit reverts to a full safety shutdown.  Safety shutdown is indicated by a red light, manual reset is required.
  • The spark is terminated after 10 seconds which greatly extends the life of the ignition transformer and the electrodes.

The primary safety control uses an ultra-violet flame detector.  The ultra-violet detector is not sensitive to daylight or artificial light, as is the case with the cadmium cell detector.  The UV sensor can also work with gas flames and the light color of bio-fuel flames.  This feature alone will prevent dangerous situations from occurring. 

Modular Design for Easy Servicing

One of the more appealing aspects of the burner is the serviceability.  The heart of the burner is the "Slide-Out Fire Control Module".  It is designed for ease of servicing and should it need replacing a new Module can be replaced within five minutes.  This Module includes all of the small operating controls; temperature sensors, electric pre-heater, solenoids, pressure switches and gauges, and the needle actuator, which could be subject to field failure.  Replacing this unit or smaller components does not require highly qualified technicians.

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