Question about Procom MN100TBA Heater

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When I turn the pilot light on it's an orange yellow flame and it goes out when I release the button. What is the problem

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The problem is the pilot assembly needs cleaning. This means cleaning the tip and the Oxygen Depletion Sensor (ODS). You will need to turn the gas off and remove the front of the heater's cabinet. Once you do, you'll have access to all the inner workings. Plus, you'll proabaly find a lot of dust and lint inside the heater cabinet. A shop Vac with a hose, brush and crevice tool attachments works well for cleaning all the interior of the unit (Cabinet interior, burner(s), etc). To clean the Pilot Assembly, use a can of compressed air with a straw nozzle ( Like you lean your computer with). Place the straw nozzle just barely into the tip of the pilot and give it a quick shot of air. Look down the pilot from the tip and you will see a small hole in the side of the pilot. That's the ODS sensor. Place the straw nozzle just barely into the hole and give it a quick shot of air. You'll probably see debris blow out the other side. Once you have completed all of this, reassemble the heater, turn the gas line valve back on and light the pilot as you normally would. It may not light the first try or two, because there may be some air in the gas line. Once the pilot lights, hold the Control Knob in for One Minute, then slowly release it and the pilot should remain lit. Turn the control knob to ON and the Burner(s) should light and burn as they should.

If all the above worked, congratulate yourself, you just completed what's called "Annual Maintenance". Which should be done every year, in the Fall, before you fire the heater up for the heating season.

In addition, in case you have misplaced your Owners Manual, I have included a link to where you can find and download and print is for future reference. Just click on you Model Number.

http://www.usaprocom.com/manuals.php?choice=1

Hope this helped you to solve the problem.

Posted on Mar 21, 2011

  • Rich Landrum Mar 22, 2011

    Darrel, glad I could help you. Thank you for the four thumbs up.

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I have a Vulcan Freeloader that is over 10 years old. The pilot does not stay lit when I release the red button. Also, the pilot flame is orange. What can be done as the main burner would not work when the...


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So the pilot flame stays lit after you release the pilot button, but goes out when you turn the knob to on. First make sure the pilot flame is a strong blue flame that is actually heating the thermocouple. If it's a lazy yellow flame, then it is dirty and will need to be blown out with a can of air with attached straw (to remove dust, spiderwebs, etc). You also might check the burner and orifice to make sure they are not blocked by a bug nests, etc and clean out as needed.

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If the new thermocouple was installed properly, with its tip in or across the pilot flame so as to be heated by the flame, then the control valve may be faulty.

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Aduz

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Lighting the pilot light


The steps involved can vary slightly depending on your furnace model and pilot valve type, so if possible try and find the instructions inside the furnace door cover or in the instruction manual. This is for a gas fired furnace, but applies to any gas-fueled appliance including water heater. Two of the most common types of pilot valve body assemblies either have a red reset button and a gas valve or no reset button and a valve knob that can be depressed. But whichever type you've got, if you have an older model furnace with a standing pilot (flame is lit all the time) then this is the basic procedure.
  • Turn you thermostat to 80 degrees or to a setting that will demand heat. Make sure the thermostat is in "Heat" mode.
  • Go to the furnace and find the pilot valve. The pilot valve body is a box shaped device into which the main gas line will run and is located near the gas burners. It will usually have a gas **** or valve knob that reads "On, "Pilot" and "Off." Locate this gas **** or knob.
  • Turn the knob or gas **** to the "Off" position and wait about 3 minutes for any residual gas to clear away.
  • Find the pilot. It's located near the gas burner tube assembly in the furnace.
  • Get your match or lighter ready. Sometimes the pilot is hard to reach. If possible, try and use a long fireplace match when you light it. If you don't have a fireplace match then a butane BBQ grill lighter works well too. If you don't have that, then you can fasten a match to the end of a stick when you light the pilot
  • If you have a pilot with a red Reset button, turn the gas valve from "Off," to "Pilot."
  • If you have a pilot with no red button, turn the knob from "Off" to "Pilot."
  • Place the lit match or ignited lighter tip at the pilot and depress and hold the button or depress the knob as appropriate. Depress the button or knob for about 30 seconds. This maintains gas flow to the pilot until the thermocouple gets hot enough to open the main gas valve.
  • Once the pilot stays lit, slowly release the button or knob and turn the gas **** or knob from the "Pilot" position to the "On" position. This will ignite the burners and keep the flow of gas supplied as required for the burners as called for by the thermostat.
  • If the burners fail to ignite then it may be because the thermocouple did not get hot enough to open the gas valve. Wait a few minutes and then repeat the above procedure. This time hold the red reset button or depress the knob for about 45-60 seconds.
  • Once the main furnace burners ignite, adjust the thermostat to the desired setting.
  • If you've followed the previous steps on lighting the pilot and it still does not light after, or will not stay lit, then you probably have a problem with the thermocouple or an adjustment needs to be made to the pilot. You'll need a furnace service technician to replace or repair these parts. You may find that the pilot lights, but it is an anemic looking flame. That's a different problem we'll look at in the next section.
  • If the pilot lights but the flame is a weak yellow flame, it will not get hot enough to heat the thermocouple to its set point allowing the gas valve to open.
    A natural gas flame should be a bright blue with the tip of the flame having just a tinge of yellow. A propane flame should have a bluish green flame with a tinge of yellow at the tip. The flame should be strong enough to hit the thermocouple tip about 1/2 inch from the tip end. If the flame is weak or shaky looking, check to see that a breeze or draft is not blowing on it. Adjusting the Flame
    There is usually a small screw on the pilot valve body that will adjust the flame. You may have to refer to the manufacturer's instructions to find the screw. Turn the screw as needed to adjust the flame throw. Yellow Flame
    A yellow flame is caused by lack of air and incomplete combustion. It can be caused by a dirty pilot tube tip. Split Flame
    This is caused by dirt in the pilot tube. Take a needle or small nail and gently clean the tube. Flickering or Wavering Flame
    A flame that flickers is usually caused by a draft.
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