valutazioni - 2, GPA: 3.5
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If a thimble is not used, all combustible material must be cut away to provide a 6 inch clearance. Any material used to close the opening must be noncombustible. Heater Parts from ACF Greenhouses INSTALLATION Horizontal Two Pipe Venting 1. When horizontal vents pass through a combustible wall (up to 8 inches thick), the vent passage must be constructed and insulated as shown in Figure 10. 2. The termination of horizontally vented system must extend 12 inches beyond the exterior surface of an exterior wall. 3. The combustion air pipe must be a minimum of 16 inches below the vent pipe, and 24 inches from the exterior wall. 4. Support the vent and combustion air pipe as shown in Figure 10. Piping 1. Installation of piping must be in accordance with local codes, and ANSI Z223.1, “National Fuel Gas Code,” or CAN/CGA-B149 in Canada. 2. Piping to units should conform with local and national requirements for type and volume and gas handled, and pressure drop allowed in the line. Refer to Table 5, to determine the cubic feet per hour (cfh) for the type of gas and size of unit to be installed. Using this cfh value and the length of pipe necessary, determine the pipe diameter from Table 2.Where several units are served by the same main, the total capacity, cfh, and length of main must be considered. Avoid pipe sizes smaller than 1/2". Table 2 allows for the usual number of fittings with a 0.3;W.C. pressure drop.Where the gas supplied has a specific gravity other than 0.60, apply the multiplying factor as given in Table 3. 3. After threading and reaming the ends, inspect piping and remove loose dirt and chips. 4. Support piping so that no strains are imposed on unit or controls. 5. Use two wrenches when connecting piping to unit controls. Length Diameter of Pipe — Inches of Pipe in Ft. 1/2 3/4 1 1-1/4 1-1/2 15 76 218 440 750 1220 30 73 152 285 590 890 45 44 124 260 435 700 60 50 105 190 400 610 75 97 200 345 545 90 88 160 320 490 105 80 168 285 450 120 158 270 420 150 120 242 380 180 128 225 350 210 205 320 240 190 300 270 178 285 300 170 270 450 140 226 600 119 192 Length Diameter of Pipe — Inches of Pipe in Ft. 2 3 4 6 8 15 2480 6500 12880 38700 79000 30 1650 4700 9700 27370 55850 45 1475 3900 7900 23350 45600 60 1150 3250 6800 19330 39500 75 1120 3000 6000 17310 35300 90 930 2600 5400 15800 32250 105 920 2450 5100 14620 29650 120 860 2300 4800 15680 27920 150 710 2000 4100 12240 25000 180 720 1950 4000 11160 22800 210 660 1780 3700 10330 21100 240 620 1680 3490 9600 19740 270 580 1580 3250 9000 18610 300 545 1490 3000 8500 17660 450 450 1230 2500 7000 14420 600 380 1030 2130 6000 12480 Table 2 Gas Pipe Capacities In Cu. Ft. per Hour with Pressure Drop of 0.3 in W.C. with Specific Gravity 0.60. Table 3 Specific Gravity Conversion Factors Multiplying factors to be used with Table 1 when the specific gravity of gas is other than 0.60. Natural Gas Propane Gas Specific Specific Gravity Factor Gravity Factor 0.55 1.04 1.50 0.633 0.60 1.00 1.53 0.626 0.65 0.962 1.60 0.612 Figure 9 Horizontal Venting - Two Pipes METAL SLEEVE FIBER GLASS INSULATION MIN. 2" 2" MIN. VENT TERMINATION SUPPORT BRACKET (where required) (Make from 1" x 1" steel angle) 9" 9" 45 1" METAL SLEEVE 2" MIN. VENT PIPE DIAMETER METAL FACE PLATE 1" Figure 10 Exhaust Vent Construction Through Combustible Walls and Support Bracket 7 CAUTION Gas pressure to unit heater controls must never exceed 14" W.C. (1/2 psi). When leak testing the gas supply piping system, the appliance and its combination gas control must be isolated during any pressure testing in excess of 14" W.C. (1/2 psi). The appliance should be isolated from the gas supply piping system by closing its field installed manual shut-off valve. Heater Parts from ACF Greenhouses INSTALLATION 8 6. Provide a drip pocket before each unit and in the line where low spots cannot be avoided. (See Figure 7). 7. Take-off to unit should come fro top or side of main to avoid trapping condensate. 8. Piping, subject to wide temperature variations, should be insulated. 9. Pitch piping up toward unit at least 1/4" per 15' of horizontal run. 10. Compounds used on threaded joints of gas piping must be resistant to action of liquefied petroleum gases. 11. Purge air before lighting unit by disconnecting pilot tubing at combination gas control. In no case should line be purged into heat exchanger. 12. After installation, check system for gas leaks, using a soap solution. 13. Install a ground joint union and a manual shut off valve immediately upstream of the unit including a 1/8" NPT plugged tapping accessible for test gage connection. (See Figure 7). 14. Allow at least 5 feet of piping between any high pressure regulator and unit control string. 15. When Pressure/Leak testing, pressures above 14'' W.C. (1/2 psi), close the field installed shut-off valve, disconnect the appliance and its combination gas control from the gas supply line, and plug the supply line before testing.When testing pressures 14" W.C. (1/2 psi) or bel...
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Riscaldamento a gas - 6-558.6 (2.89 mb)
Riscaldamento a gas - 6-558.6 (2.89 mb)