Assessments - 3, GPA: 3.7
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Note: The gas pressures specified below refer to pressures taken at the pressure tap on the gas inlet pipe just above the regulator. See chapter 3.8 for measuring gas pressure. MAXIMUM INLET GAS FLOW PRESSURE SETTING Altitude Nat. Gas inches W.C. Liquid Propane inches W.C. 0. -2 000 ft 5.7. 10.5. 2 000 ft -4 500 ft 4.6. 8.4. Table 3 Above 4.500 ft consult your local gas provider GAS LINE SIZING The gas supply piping should be sized according to the applicable code for a maximum draw of 74,900 BTUH. Measure the length of gas supply line and use the tables in Fig. 13 or the gas line manufacturer.s sizing tables to determine the pipe diameter necessary to accommodate the BTU demand of the unit. If there are more gas appliances drawing on the same line, size the gas line according to the total maximum amount of BTU draw for all appliances. Note: Under sizing the gas line may result in diminished output and improper operation. See chapter 3.8 for the procedure to confirm gas pressure. 6 720 608 124 Installation instructions FOR NATURAL GAS Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop of 0.3 in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands. Copper tubing is prohibited for use with Natural Gas in the Commonwealth of Massachusetts and not recommended elsewhere. Follow boxed numbers for piping just one GWH 1000 P (example: .. B.I. Natural Gas pipe for 20 ft (6.1m). will handle 190,000 btu.s (55.7 kWh). For multiple appliances combine the total btu input load and then refer to applicable chart below. Nominal Iron Length of Black Iron Pipe, Feet Pipe Internal Size Diameter inches inches 10 20 30 40 50 60 70 80 90 100 125 150 175 200 1/2 291 200 160 137 122 110 94 84 74 67 58 3/4 608 418 336 287 255 231 197 175 155 140 120 1 1145 787 632 541 480 434 372 330 292 265 227 3/4 0.824 278 190 152 130 115 105 96 90 84 79 72 64 59 55 1 1.049 520 350 285 245 215 195 180 170 160 150 130 120 110 100 1 1/4 1.380 1050 730 590 500 440 400 370 350 320 305 275 250 225 210 Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet Tube size, inches EHD* 10 20 30 40 50 60 1/2 18 EHD 82 58 47 41 37 34 3/4 23 EHD 161 116 96 83 75 68 1 30 EHD 330 231 188 162 144 131 1 1/4 37 EHD 639 456 374 325 292 267 * EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing. FOR LP GAS Maximum Capacity of Pipe in Thousands of BTU per Hour of Undiluted Petroleum Gases (at 11 inches Water Column Inlet Pressure) (Based on a Pressure Drop of 0.5 Inch Water Column). * EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing. N o minal Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet Iro n pipe Black Iron Pipe Tube size Lenght of pipe, Feet size inches 10 20 30 40 50 60 80 100 125 150 200 inches EHD* 10 20 30 40 50 60 Maximum Capacity of Semi-Rigid copper Tubing in Thousands of BTU per Hour of Undiluted Liquefied Petroleum Gases (at 11 inches Water Column Inlet Pressure). (Based on a Pressure Drop of 0.5 Inch Water Column) * Source National Fuel Gas Code NFPA 54, ANSI Z223.1 -No Additional Allowance is necessary for an ordinary number of fittings 1/2 3/4 1 1 1/4 Outside diameter Inch 10 3/8 39 1/2 92 5/8 199 3/4 329 18 EHD 129 91 74 64 58 53 23 EHD 254 183 151 131 118 107 30 EHD 521 365 297 256 227 207 37 EHD 971 661 528 449 397 359 Copper (LP gas only) Length of Tubing, Feet 20 30 40 50 60 70 80 90 100 26 21 19 _ _____ 62 50 41 37 35 31 29 27 26 131 107 90 79 72 67 62 59 55 216 181 145 131 121 112 104 95 90 Fig. 13 6 720 608 124 Installation instructions 3.8 Measuring gas pressure Connecting manometer B Shut off gas. B Remove front cover and locate inlet gas pressure measuring point on the right side, see Fig. 14. B Loosen screw from test point on the right side and connect manometer tube on test point. Fig. 14 Gas pressure measuring point A Inlet tap Static pressure test B Turn gas supply back on. B Record static gas pressure reading on back page of manual. Operating pressure test B Turn on all hot water taps served by the water heater. B Set flow control knob fully clockwise. B Set slide control to the right. B Operate all other gas appliances on same gas piping system at maximum output. B Record operating gas pressure reading on back page of manual. Gas pressures lower than 5.7" W.C. for Natural Gas or 10.5" W.C. for LP Gas will result in insufficient degree rise to the hot water being used, and must be corrected. See Gas Line Sizing under chapter 3.7. 3.9 Water connections When facing the heater, the .. cold water inlet is on the bottom right and the hot water outlet is on the bottom left. B Install unions or the Webstone service valves when connecting plumbing to the water heater. This will facilitate any necessary cleaning and servicing. Although water piping throughout your structure may be other than copper, w...