What size orifice is needed to convert natural gas to lp in a kenmore furnace model 867779020?

What size orifice do I need to convert natural gas to lp. Furnace is a Kenmore model 867779020

The size that comes with the changeover kit that is bought for your model 86779020
It takes more than just changing the orfices

Yes I know that the spring in the gas valve needs to be changed and that the gas pressures need to be adjusted to 10.5" WC. But I don't know where to find a conversion kit

Have you tried Sears parts?

Try www.searspartsdirect.com

Yeah when I search there website, it found the parts but they were not authorized to sell by the manufacture. They also wopuld not show me what orifice size was needed

ICP and Heil use the same part number orifices. The question is which one is for LP and can the furnace be converted to LP safetly. As you are aware the LP orifice will be a smaller drill bit number size than the one fromnatural gas.Good hunting.

On most lp furnaces the orifice size for LP is a 55. And I can't find anywhere that I can buy the conversion kit & yes this furnace is safe to use with LP. Does anyone know another place other than sears that I could go to order the conversion kit??

Your local HVAC company/tech, should be able to get and install one, most hvac supply houses won`t sell to anyone that's not trained and a qualified hvac machanic or contractor,, lots of liability involved when dealing with gas appliances