Rheem P-M406 Operating Instructions - Page 20

GAS PRESSURE REGULATOR The gas pressure regulator is preset at 4.0 in. WC for natural gas (3.1 in. WC for Lo NOx), and 10.5 in. WC. for propane gas. The pressure at the gas valve, taken with a manometer, should be about 4.0 in. WC natural gas (3.1 in. WC for Lo NOx) and 10.5 in. WC propane gas. If an adjustment is needed, remove seal and turn adjustment screw clockwise to increase pres- sure or counter-clockwise to decrease pressure. NOTE: Lo NOx gas valves are non-adjustable; settings are fixed by the manufacturer (Invensys/Robertshaw). ELECTRONIC IGNITION GAS VALVES-CONTINUED Gas Pressure Adjustment Robertshaw 7200 (Heater Model 206) Robertshaw 7000 BDER (Heater Models 266-336) MANUAL SHUT-OFF VALVE UNION Gas Pressure Adjustment Robertshaw 7000 DERHC (Heater Model 406) Non-Adjustable Gas Valve MANOMETER GAS PRESSURE TEST AT GAS VALVE GAS PRESSURE ADJUSTMENT LOCATIONS MILLIVOLT GAS VALVES Robertshaw 7000 BDERF (Heater Models 207-407) PIPE SIZING FOR GAS CONNECTIONS Gas Pressure Adjustment Robertshaw 7000 (Heater Models 206-406) ELECTRONIC IGNITION GAS VALVES Gas Pressure Adjustment Honeywell VR8304 (Heater Models 206406 and 207-407) Maximum Equivalent Pipe Length (ft) Natural Gas 1000 BTU/FT3 0.60 Specific Gravity @ 0.5 in. WC Pressure Drop Propane Gas 2500 BTU/FT3 1.53 Specific Gravity @ 0.5 in. WC Pressure Drop Input 3/4" 1" 1-1/4" 1-1/2" Model (KBTU) N P N P N P N P 206/207 199.5 25 60 90 215 360 266/267 266.0 15 35 50 125 210 480 445 336/337 332.5 10 20 30 80 140 320 290 406/407 399.0 * 15 20 55 95 225 215 480 *A 3/4" gas line can be used for up to 5 ft maximum length from the gas valve in addition to the sediment trap. 20