Natural gas and LP gas appliance compatibility
These two fuels are similar in that both are used to provide energy to home heating systems and other appliances but they have some different properties of weight, method of distribution, and chemistry. Most gas appliances are delivered already set up to use either natural gas or LP gas but not both.
Most gas appliances can be converted from one fuel to the other - what is involved may be simply changing gas metering orifices in the equipment (for example at the burners on a stove) or it may also be necessary to change or adjust a gas regulator located inside the appliance. Do not hook up an LP gas-ready appliance to a natural gas supply nor can you connect a natural-gas ready appliance to an LP gas supply without reviewing and acting on the manufacturer's instructions for converting the appliance from one fuel to the other.
Important Safety Warning: be sure that all gas-fired appliances in your building have been properly set up for the correct type of gas to be consumed.
Do not connect an appliance set up for propane to a natural gas supply, and do not connect an appliance set up for burning natural gas to a propane gas supply without first making the required gas pressure and/or gas metering orifice adjustments. Making either of this mistakes can lead to gas leaks, fire, explosion, or potentially fatal carbon monoxide poisoning.
Virtually every modern gas fired appliance installation manual contains instructions for setting up the appliance to burn the proper fuel: LP gas (liquid propane from a tank installed at the property) or natural gas (piped in gas provided from a local gas utility company).
The pressure provided by natural gas is different from propane - adjustments will be needed at every gas fired appliance in the home.
Usually this means either an adjustment made at each gas burner at a metering device or in some cases a part actually has to be changed (an orifice through which the gas passes). On some appliances there may be a local gas regulator that also needs to be adjusted.
Where a gas burner metering device needs to be set properly for Natural Gas pressure or for LP gas pressure, the adjustment may be as simple as using a screwdriver or tool to turn the orifice from one position to another at each burner, or a part may need to be actually swapped out or exchanged. Appliance installation instructions will include sketches of where these parts are found as well as directions for how to set the metering device or regulator for the proper fuel.
source: http://inspectapedia.com/plumbing/Gas_Conversion_LP_NG.htm
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