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Textile Machines – Thermal Oil Heater

Thermal Oil Heater: Thermal fluid heating is a form of indirect heating in which a liquid phase heat transfer medium is heated and distributed inside a closed-loop device to one or more heat energy users. Popular heat transfer mediums are thermal oil, glycol, and water. Two types of standard thermal fluid heating system packages are available in the Sigma Thermal HC product line, HC-1, and HC-2. In addition, diffusion heaters are provided for thermal fluid systems with electrical processes. We also sell thermal fluid heaters designed for personalized needs. Contact one of our application engineers and let us help you determine which solution for your project is the right solution.

thermal oil heater

Thermal Oil Heater Parts

Thermal Oil Heater is consist of the following mention parts,

  1. Circulation fan
  2. Pressure switch for oil pressure
  3. Air blower
  4. Air pressure switch
  5. Ignition transformer
  6. Pilot valve
  7. V sensor
  8. Modulating motor
  9. Main gas regulation valve
  10. Min & Max gas pressure switch
  11. Exhaust temperature controller
  12. Oil level sensor
  13. Oil temperature controller.
  14. Inlet Oil temperature controller
  15. Control Panel


Our Thermal Oil Heater operation is fully automatic. The generator setup continues as follows:

  1. Press the fuel oil or fuel Gas push button depending on the fuel you want to use.
  2. Start-up the thermal oil circulation pump.
  3. Press the Fuel oil push button.
  4. Press burner start and the following operation will start automatically.
    1. Ignition programmer start-up
    2. Combustion air fan start-up, Fan lamp, will light up and insertion compressed air solenoid valve of atomization.
  • Combustion air damper opening, controlled by the limit switches inside the servomotor.

Note: after opening, in case the air combustion pressure switch does not sense sufficient pressure, the ignition programmer will shut-down followed by an acoustic and lightening signal Air Failure.

  1. Combustion air damper closing, controlled by the limit switches inside the servomotor.
  2. Connection of ignition transformer and opening of pilot gas solenoid valves.
  3. Ignition of pilot torch and disconnection of the ignition transformer.
  • Photocell senses the flame.
  • When the burner hold the flame the main modulating gas valve is opened slowly up to its maximum opening position with the help of servo motor because of this burner is fired on high flame.
  1. The air dumper is also being opened with the same modulating motor through a connecting shaft
  2. Servo motor is operated by the temperature controller, according to process temperature setpoint (open valve upon heat demand).


In the case of the photocell does not sense the pilot flame programmer will stop, followed by a blinking and acoustic signal Flame Failure. In such cases silence the hooter by pressing ACK, in this way the blinking signal will become a fix light.

To start the programmer again, press Burner start, Flame Failure signal will turn off and the ignition sequence will be repeated.

Automation (start-up) system to control ignition cycle and burner shut down with pre-purge carried out with air damper fully open. Pilot flame ignition and checking, full regulation valve automatic opening. Automatic shut-down in case of a safety interlock event.

Flame protection system carried out with ultraviolet scanner, an amplifier for automatic shut down of the burner safety valves in case of flame failure.

  • High / low-temperature switches to shut down the burner for stand by purposes.
  • High-temperature switch for safety shut down of the burner in case of very high temperature.
  • Pilot burner (gas operated) ignition electrode & transformer (5000V)
  • Safety pressure switches for fuel, hot oil circulation.
  • Burner interlock for the oil circulation pump will not operate.

Before Start-up Checklist:

  • Check Gas line for any leakage.
  • Check the oil line for any leakage.
  • Check the surrounding area for any flame able thing.
  • Check the oil level in the expansion tank.

Operation Check List:

  • Check oil line & expansion bellows flanges for leakage after burner is fired.
  • Take oil temperature at inlet after achieving the set point.
  • Take oil temperature at the outlet after achieving the set point.
  • Take the exhaust temperature after achieve the set point.
  • Take oil pressure at the inlet/outlet startup of the oil pump.
  • Take oil pressure at the inlet/outlet after achieving the set point.
  • Take the current oil pump motor after achieve the set point.
  • Check the flame color & strength through the sight glass.

Safeties & Alarm for Oil Heater:

  • Flame Failure
  • Air Failure
  • Low Gas Failure
  • Oil outlet temperature
  • Low Oil Circulation
  • High Oil Temperature
  • Fuel Oil Pump
  • Fan/Blower
  • Exhaust Temperature
  • Oil Inlet Temperature
  • Low Oil Level

About engrsajidrehman

I am an Electronics Engineer by profession and currently is a Service Engineer in European Based Textile Machinery Manufacturing Company. Beside all this I'm a Web Designer, Graphics Designer, Content writer. I love to explore places and new things. You can contact him on Google, Linkedin, and subscribe my YouTube Channel for cool stuff Thanks