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Procom MN300HPA ventless heater conversion

Want to convert from natural gas to propane. Needed parts? Procom will not be able to supply according to them.

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  • circut Nov 07, 2008

    Ok, I got the ratings for the gas which are / Pressure regulator setting at 6" W.C. / Inlet gas pressure(inches of water) Maximum 10.5" and a Minimum of 7". This comes from the manual on the natural gas. I do not have a manual for the Propane model to get the specs. And therefore, do not have any specs. for this to operate. This is a selectable model from 7,000/18,000/30,000. It consists of 5 infrared plats as they are called. Which to me are ceramic plates.

    I did take out the injectors (orifices-5) and they were stamped 17. These may need to be changed as well. This is ventless and is very touchy on tolerances. As I have been told. So, my thinking is what lp regulator will I need? Do I need to change down size on the orifices? Help!!!!!!!!

  • circut Nov 07, 2008

    Procom has been contacted and will not give out any info as to what needs to be done to convert to propane. They state that it is illegal to convert these do to it being a ventless heater. But did provide the statement that it will not work with the stock regulator that came with the natural gas version. Those specs were provided in the above thread for the natural gas. Injectors was also mention as needed to be changed (orifices). They have this heater in a propane version but will not give out any information. No less. They do not want me to change or alter this in anyway. But!!!!!!! Any further suggestion??????????



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  • 108 Answers

You need to first get a regulator which will go between the propane tank and the burner. You will need to know the burner capacity in BTU/HR and the pressure required. All of this can be found on the furnace specification plate or on the gas valve. It is a no brainer Circut!


Posted on Nov 07, 2008

  • Ray Nov 07, 2008

    11" WC is OK. All regulators should be rated as to capacity as to BTU/Hr You need to demand this info.


  • Ray Nov 08, 2008

    Natural gas and propane are very different gases. For your heater you will probably need 28" WC regulator outlet pressure for the heater to operate correctly. All pressure regulators are adjustable. Remove the cap at the top of the regulator and you will find an adjustment screw. Turn it clockwise to increase outlet pressure. I strongly suggest installing a "tee" fitting on the regulator output, and installing a pressure gauge that reads WC. Failing that, get a 1 psi regulator and turn the screw counterclockwise to reduce the outlet pressure somewhat. Installing a pressure gauge is important for proper combustion.



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