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User manual A.O. Smith, model 403

Manafacture: A.O. Smith
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See Table 11, Figure 7 for venting specifications. The exhaust vent pipe must be of a type listed for use with Category III gas burning heaters such as "Saf-T-Vent" manufactured by Heat-Fab Inc. For Category III installations, it is important that the Installed vent be airtight. Please insure that all joints are sealed properly during installation. For Horizontal Vent Kit part numbers, see Table 7. TABLE 7: HORIZONTAL VENT KITS. HORIZONTAL VENT KIT MODEL 211426 G(B,W) 1000 211426-1 G(B,W) 1300 211426-1 G(B,W) 1500 211426-2 G(B,W) 1850 211426-2 G(B,W) 2100 211426-3 G(B,W) 2500 DIRECT VENT VERTICALAND HORIZONTAL VENTING For direct vent applications, this boiler may be vented according to Tables 12 and 13; see Figures 8 and 9. For category III applications, 9 the exhaust vent pipe must be listed for use with category III gas burning heaters such as "Saf-T-Vent" manufactured by Heat-Fab Inc. This vent system must be 100% sealed with a condensate trap located as close to the boiler as possible. When sizing exhaust piping and intake air piping, 90-degree elbows are equivalent to 10 feet (3.1 m) of straight pipe and 45-degree elbows are equal to 5 feet (1.5 m) of straight pipe. The intake air piping can be PVC, CPVC, ABS, Galvanized steel or any suitable intake air piping that can be sealed. See Table 8 for Direct Vent Kit numbers. TABLE 8: DIRECT VENT KITS. HORIZONTAL DIRECT VENT KIT NO. MODEL 211090 G(B,W) 1000 211090-1 G(B,W) 1300 211090-1 G(B,W) 1500 211090-4 G(B,W) 1850 211090-2 G(B,W) 2100 211090-3 G(B,W) 2500 VERTICAL DIRECT VENT KIT NO. MODEL 211089 G(B,W) 1000 211089-1 G(B,W) 1300 211089-1 G(B,W) 1500 211089-4 G(B,W) 1850 211089-2 G(B,W) 2100 211089-3 G(B,W) 2500 AIR INTAKE TERMINAL MODEL 191965-2 G(B/W) 1000 211336 G(B/W) 1300,1500,1850 211336-1 G(B/W) 2100, 2500 HORIZONTAL VENT INSTALLATION This boiler can be vented through the rear of the cabinet with the use of the fluebox and vent adaptor. Any of the previous venting configurations can be installed with rear connections. To change the unit to rear exhaust: 1. The vent collar and cover plates must be removed from the top and rear of the unit. 2. Trim the insulation from around the rear flue hole in the jacket and the fluebox. Support insulation from inside the fluebox to facilitate cutting. Use safety precautions such as gloves. Place the gasket and vent adaptor in the horizontal position. Place the gasket and flue plate in the vertical position as shown in Figure 4. Figure 4. Switching from Vertical to Horizontal Venting. POWER VENT (OPTIONAL) The length of vent used in horizontally vented installations can be extended beyond the lengths shown in Tables 11 and 13 by implementing the kits listed below: TABLE 9: POWER VENT KITS. POWER VENT KIT NO. MODEL MAX. LENGTH 211499 G(B,W) 1000 110' (33.5 m) 211499-1 G(B,W) 1300 100' (30.5 m) 211499-1 G(B,W) 1500 100' (30.5 m) 211499-2 G(B,W) 1850 100' (30.5 m) 211499-3 G(B,W) 2100 100' (30.5 m) 211499-4 G(B,W) 2500 100' (30.5 m) CONNECTING BOILER TO A COMMON VENT Do not connect the boiler to a common vent or chimney with solid fuel burning equipment. This practice is prohibited by most local building codes as is the practice of venting gas fired equipment to the duct work of ventilation systems. Where a separate vent connection is not available and the vent pipe from the boiler must be connected to a common vent with an oil burning furnace, the vent pipe should enter the common vent or chimney at a point ABOVE the flue pipe from the oil furnace. UL/ULC listed double wall type B-1 gas vents, through 16" diameter, can be installed in heated and unheated areas and can pass through floors, ceilings, partitions, walls and roofs, provided the required clearance is observed. At the time of removal of an existing boiler, the following steps shall be followed with each appliance remaining connected to the common venting system. Perform these steps while the other appliances remaining connected to the common venting system are not in operation. 1. Seal any unused opening in the common venting system. 2. Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion or other unsafe condition. 3. Insofar as is practical, close all building doors, windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dryers and any appliance not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers. 4. Test fire the appliance(s) being inspected, making sure to follow the manufacturers lighting and operating instructions. Appliance(s) operating controls should be adjusted to provide continuous service. 5. Check vent pressure of the appliance 24 inches (61.0 cm) above boiler vent collar. Vent p...