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Hersteller: A.O. Smith Dateigröße: 335.32 kb Dateiname: Unterrichtssprache:

When sizing exhaust piping and intake air piping, 90-degree elbowsare equivalent to 10 feet (3.1 m) of straight pipe and 45-degreeelbows are equal to 5 feet (1.5 m) of straight pipe. The intake air piping can be PVC, CPVC, ABS or any suitable intakeair piping that can be sealed. Combustion air from outside the building ducted to boiler air inlet(Ducted Air Application) cannot be used in rooms with negative pressure. VENT CONNECTOR MODEL NUMBER G(W,B) 1000 10" (25.4 cm) G(W,B) 1300 12" (30.5 cm) G(W,B) 1500 12" (30.5 cm) G(W,B) 1850 14" (35.6 cm) G(W,B) 2100 14" (35.6 cm) G(W,B) 2500 16" (40.6 cm) HORIZONTAL VENT INSTALLATION This boiler can be vented through the rear of the cabinet with theuse of the Fluebox and vent adaptor. Any of the previous ventingconfigurations 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 topand 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 toFor vent arrangements other than table 7 and for proper boiler facilitate cutting. Use safety precautions such as gloves. Place operation, a barometric damper is required to maintain draft the gasket and vent adaptor in the horizontal position. Place the between -0.02" W.C.. and -0.04" W.C. at 2 feet (0.6 m) above the gasket and flue plate in the vertical position as shown inboiler vent collar. figure 9. Figure 9. Switching from Vertical to Horizontal Venting 14 SYSTEM INSTALLATION GENERAL If the system is to be filled with water for testing or other purposes during cold weather and before actual operation, care must be taken to prevent a down draft entering the boiler or freezing air from contacting the system. Failure to do so may cause the water in the system to freeze with resulting damage to the system. Damage due to freezing is not covered by the warranty. Good practice requires that all piping, etc., be properly supported. The boilers described in this manual may be used for space (hydronic) heating or for the heating of potable water. If the heater is to be used for hydronic space heating, follow the instructions on pages 15-17 given for equipment required for installation as in Figure 10. However, if units are to be used for heating potable water, the information describing specific systems is found on pages 17-19. See figures 11 and 13. Installations must comply with all local codes. HYDRONIC INSTALLATION The following is a brief description of the equipment required for installations noted in this manual. All installations must comply with local codes (see figure 10). Table 12: INSTALLATION ITEMS NO. SUGGESTED ITEMS FOR INSTALLATION 1. PAIR OF SHORT PIPE NIPPLES, PAIR OF BOILER LOOP TEES AND BALL VALVE BETWEEN SYSTEM SUPPLY AND RETURN - ONE SET PER EACH BOILER 2. BOILER PIPE LOOP (See Sizing Data Table 4.) 3. BOILER CIRCULATING PUMP (See Sizing Data Table 4.) 4. THERMOMETER 5. PRESSURE GAUGE 6. LOW WATER CUTOFF (If Required By Local Code.) 7. SAFETY FLOW SWITCH (Factory-Installed) 8. RELIEF VALVE (Factory-Installed) 9. BOILER INLET - OUTLET 10. SYSTEM SUPPLY TEMPERATURE THERMOMETER 11. DRAIN or BLOW-DOWN VALVE WATER SUPPLY LINE These boilers can be used ONLY in a forced circulation hot water heating system. The pump must be interlocked with the boiler to prevent boiler operation without water circulation. See maximum and minimum flow rate information. Since most forced circulation systems will be of the closed type, install the water supply line as shown on piping diagram, figure 10. Severe damage will occur if the boiler is operated without proper water flow circulation. Fast filling of large pipe, old radiator installations (where high pressures are not available) requires bypassing of the pressure reducing valve. Generally, pressure purging is not possible with a well pump system. High point air venting is essential. For details, refer to OPERATION section of this manual on page 22. If the system is of the open type, a pressure reducing valve will not be required as the water supply to the system will be controlled by a manually operated valve. An overhead surge tank is required. A MINIMUM PRESSURE OF 15 PSI (100 kPa) MUST BE MAINTAINED ON THE BOILER AT ALL TIMES to avoid potential damage to the boiler that may not be covered by the warranty. CONVENTIONAL SPACE HEATING INSTALLATION Modern fin type boilers are exceptionally fast heating units. The low water volumes in relation to firing rates require special attention to water flow rates for smooth, efficient operation. These considerations for the A. O. Smith copper heat exchanger boilers are covered below. Refer to table 4 showing flow rate vs. pressure drop and temperature rise. Figure 10 shows a typical installation of the boiler. A system with several flow controlled zones, or with a 3-way mixing valve system could present a flow rate to the boiler of less than required for a maximum of 50°...

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