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Lennox G12/G12R warm air heaters can form the heart of one limit control above the burner section with manual reset. Specifications. Model No. (G12/G12R).Follow tllegas suppl_or's. Instructions. If you do not smell gas go to next step. 7- Remove the pilot access panel located below and behind the gas valve. G12, G12E, G12R, G12RE Series Units 502,194M RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE Supersedes 502,112M FOR YOUR SAFETY Do not store or use gasoline In 1979 Lennox introduced new G12E furnaces featuring high 2 - Manual Gas Shutoff Valve (Penn-Johnson Ignition Sys- tem Only). The Lennox gas fired up-flo G12 series furnaces are equally appli- trol valve combines automatic safety pilot, manual set knob (On-. G12 and G12E gas furnaces must be vented in compliance with all local codes, the National Fuel Gas Code (ANSI-Z223.1-1984) and these instructions. CAUTION -