Raypak 122-322 Operating And Installation Instructions page 20

GAS PRESSURE REGULATOR
The gas valve pressure regulator(s) on the heater are nominally preset at 3.5" W.C. for Natural gas, and 10.5" W.C. for
Propane gas manifold pressure. The pressure at the gas valve outlet tap, measured with a manometer,while in operation
should be 3.5 ± 0.1" W.C. for Natural gas and 10.5" ± 0.1" W.C. for Propane gas. If an adjustment is needed, turn the
adjustment screw clockwise to increase pressure or counter-clockwise to decrease pressure.
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