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Turn on clothes dryers and any appliances not connected to the common In the event that an existing furnace is removed from a venting system. Turn on any exhaust fans, such as venting system commonly run with separate gas ap range hoods and bathroom exhausts, so they will oper pliances, the venting system is likely to be too large to ate at maximum speed. Do not operate a summer ex- properly vent the remaining attached appliances, haust fan. Close fireplace dampers, Conduct the following test while each appliance is operat 4 -Follow the lighting instructions, Turn on the appliance ing and the other appliances (which are not operating) re- that is being inspected. Adjust the thermostat so that main connected to the common venting system. If the the appliance operates continuously, venting system has been installed improperly, you must 5 -After the main burner has operated for 5 minutes, test correct the system as indicated in the general venting requirements section, for leaks of flue gases at the draft hood relief opening, Use the flame of a match or candle, or smoke from a 1 -Seal any unused openings in the common venting sys cigarette, cigar, or pipe, tem. 6 -After determining that each appliance connected to the _ Inspect the venting system for proper size and horizontal common venting system is venting properly, (step 3) pitch, Determine that there is no blockage, restriction, return all doors, widows, exhaust fans, fireplace damp- leakage, corrosion, or other deficiencies which could ers, and any other gas-burning appliances to their pre- cause an unsafe condition, vious mode of operation, 3 -Close all building doors and windows and all doors be-7 - If a venting problem is found during any of the preced tween the space in which the appliances remaining ing tests, the common venting system must be modi- connected to the common venting system are located fied to correct the problem, Page 19 Resizethecommonventingsystemto theminimum ventpipesizedeterminedbyusingtheappropriate tablesin appendixG.(Thesearein thecurrentstandardsoftheNationalFuelGasCodeANSIZ223.1in theUSA,andtheappropriateCategory1NaturalGas andPropaneappliancesventingsizingtablesin the currentstandardsof theCSAB149NaturalGasand PropaneInstallationCodesinCanada.) A,CAUTION Gas Supply 1 -This unit is shipped standard for left or right side installation of gas piping (or top entry in horizontal applications). Connect the gas supply to the piping assembly. 2 -When connecting the gas supply piping, consider factors such as length of run, number of fittings, and furnace rating to avoid excessive pressure drop. Table 9 lists recommended pipe sizes for typical applications. Nominal Internal IronPipeDiameter Size inches 10 inches (mm) (3.048) (ram) 3/8 .493 95 (9.53) (12.522) (2.69) 1/2 .622 175 (12.7) (17.799) (4.96) 3/4 .824 360 (19.05) (20.930) (10.19) 1 1.049 680 (25.4) (26.645) (919.25) 1-1/4 1.380 1400 (31.75) (35.052) (39.64) 1-1/2 1.610 2100 (38.1) (40.894) (59.46) 2 2.067 3950 (50.8) (52.502) (111.85) 2-1/2 2.469 6300 (63.5) (67.713) (178.39) 3 3.068 11000 (76.2) (77.927) (311.48) NOTE -Capacity given in cubic feet TABLE Gas Pipe Capacity Length of Pipe -feet(m) 20 3040 (6.096) (9.144) (12.192) 65 5245 (1.84) (1.47) (1.27) 120 97 82 (3.40) (2.75) (2.32) 250 2OO 170 (7.08) (5.66) (4.81) 465 375 32O (13.17) (10.62) (9.06) 950 77O 66O (26.90) (21.80) (18.69) 460 1180 990 (41.34) (33.41) (28.03) 2750 2200 1900 (77.87) (62.30) (53.80) 4350 3520 3000 (123.17) (99.67) (84.95 7700 6250 5300 (218.03) (176.98) (150.07) (In 3) of gas per hour and based 3 -The gas piping must not run in or through air ducts, clothes chutes, gas vents or chimneys, dumb waiters, or elevator shafts. 4 -The piping should be sloped 1/4 inch (6.4 mm) per 15 feet (4,57 m) upward toward the meter from the furnace. The piping must be supported at proper intervals [every 8 to 10 feet (2.44 to 3.01 m)] with suitable hangers or straps, Install a drip leg inside vertical pipe runs to the unit, 5 -In some localities, codes may require the installation of a manual main shut-off valve and union (furnished by the installer) external to the unit, The union must be of the ground joint type, A, IMPORTANT NOTE -Install a 1/8 inch NPT plugged tap in the field piping upstream of the gas supply connection to the unit. The tap must be accessible for test gauge connection. See figure 19. NQ TE -If emergency shutoff is necessarj4 shut off the main manual gas valve and disconnect main power to the furnace. The installer should properly label these devices. 9 -ft3/hr (m3/hr) 5060 70 (15.240) (18.288) (21.336) 40 3633 (1.13) (1.02) (.73) 73 66 61 (2.07) (1.87) (1.73) 151 138 125 (4.28) (3.91) (3.54) 285 26O 24O (8.07) (7.36) (6.80) 580 53O 490 (16.42) (15.Ol) (13.87) 9OO 81o 75O (25.48) (22.94) (21.24) 1680 1520 1400 (47.57) (43.04) (39.64) 2650 2400 2250 (75.04) (67.96) (63.71) 4750 4300 3900 (134.50) (121.76) (110.43) on O.60 specific gravity gas. 80 90 100 (24.384) (27.432) (30.480) 3129 27 (.88)...

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