Omcan CE-CN-G15M Manuel D'instructions page 10

Installation
6. Remove the Orifice and Replace it. Use a 1/2" spanner.
See the list of Orifice numbers for the appropriate gas type.
Main Burner Valve
Use for Natural Gas
Use for Natural Gas
Pilot Valve Orifice
Use for Propane
(L.P.)
Use for Propane
(L.P.)
Pilot
Orifice
10
Orifice