Raytherm WH-0133 Installation & Operating Instructions Manual
                                                    | |
Contents
| 
21Gas Pressure RegulatorThe gas pressure regulator located in the gas valve ispreset nominally at 4" WC for natural gas, and 11" WCfor propane. Between the gas valve and the burners isa 1/8" pipe plug. The pressure at this point, taken witha manometer, should be about 3.7" WC natural gasand 10.5" WC propane. Models 0181, 0261, 0331, and0401 should be 3.9 WC natural gas. If an adjustmentis needed, turn adjustment screw clockwise toincrease pressure, or counter-clockwise to decreasepressure.Venting of Diaphragm GasComponentsGas train components that have diaphragms in theirconstruction are supplied with a bleed line connectionthat must be connected to the outside atmosphere asrequired by the National Fuel Gas Code. Under NOcircumstances shall bleed lines terminate in the gasutilization equipment flue or exhaust system.Fig. 20: Bleed Line ConnectionN P N P N P N P N P N P N P N P N P0133 15 35 60 145 200 500*0182/0181 - 15 30 65 95 250 400 - - - - - - - - - - -*0260/0261 - 10 20 40 60 140 250 560 - - - - - - - - -*0330/0331 - 15 25 35 85 150 380 360 - - - - - - - - -*0400/0401 - - 15 25 60 100 260 250 - - - - - - - - -00506303105156535101-4150 - - - - - - -04305259001545201--4260 - - - - - - -00606208157085302---4270 - - - - - -00508458103155065251---4280 - - - - -0926/0962 - - - 15 20 45 45 110 150 360 400 - - - - -1083/1125 - - - 10 15 35 35 80 120 300 300 - - - - -1178/1223 - - - - - 25 25 60 85 220 200 - - - - -1287/1336 - - - - - 25 20 55 75 180 170 325 560 - - -1414/1468 - - - - - 20 15 45 65 150 165 300 500 - - -1571/1631 - - - - - 15 15 35 50 120 125 250 400 - - -1758/1826 - - - - - 15 10 30 40 100 100 225 340 - - -2100 - - - - - 10 10 25 30 80 75 175 260 - - -2500 - - - - - - - 15 20 55 55 135 160 400 600 -3001 - - - - - - - 10 15 35 40 85 120 250 500 -3500 - - - - - - - - 10 30 30 45 80 200 400 6004001 - - - - - - - - 5 20 25 35 65 160 300 4001-1/2"3/4"MAXIMUM EQUIVALENT PIPE LENGTHNATURAL GAS 1000 BTU/Cubic Foot .60 SPECIFIC GRAVITY @ 0.5" W.C. PRESSURE DROP2" 2-1/2" 3" 4"PROPANE GAS 2500 BTU/Cubic Foot 1.53 SPECIFIC GRAVITY @ 0.6" W.C. PRESSURE DROP"4/1-1"1"2/1* Models 0181, 0261, 0331, and 0401 are Low NOx units and are not available in propane.A minimum of 7" WC and a maximum of 10.5" WC upstream pressure under load, and no load conditions must be provided for natural gasor a minimum of 11" WC and a maximum of 13" for propane.Table G: Maximum Equivalent Pipe Lengths |
manualsdatabase
Your AI-powered manual search engine