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1) Make sure the valve is in the "OFF" position. 2) Loosen the "IN" and/or "OUT" pressure tap(s), turning counterclockwise with a 1/8" wide flat screwdriver. 3) Attach manometer to "IN" and/or "OUT" pressure tap(s) using a 5/16" ID hose. G36D-NG1 System Data For 0 to 4500 feet altitude Burner Inlet Orifice Sizes: #42 Max. Input Rating 26,000 Btu/h Min. Input Rating 13,100 Btu/h Supply Pressure min.5.0" w.c. Manifold Pressure (High) 3.8"+/- 0.2"w.c. Log Set: Ceramic fibre, 7 per set. Vent System: