valutazioni - 2, GPA: 3.5
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Rigid hangers may transmit noise through the system resulting from the piping sliding in the hangers. It is recommended that padding be used when rigid hangers are installed. Maintain 1" clearance to combustibles for hot water pipes. Pipe the discharge of the relief valve (full size) to a drain or in a manner to prevent injury in the event of pressure relief. Install an air purger, an air vent, a diaphragm-type expansion tank, and a hydronic flow check in the system supply loop. Minimum fill pressure must be 12 psig (82.7 kPa). Install shutoff valves where required by code. Suggested piping diagrams are shown in Figures 4, 5, 6, 7 and 8. These diagrams are meant only as a guide. Components required by local codes must be properly installed. 4A.2 Cold Water Make-Up — Boiler 1. Connect the cold water supply to the inlet connection of an automatic fill valve. 2. Install a suitable back flow preventer between the automatic fill valve and the cold water supply. 3. Install shut off valves where required. NOTE: The boiler, when used in connection with a refrigeration system, must be installed so the chilled medium is piped in parallel with the boiler with appropriate valves to prevent the chilled medium from entering the boiler. The boiler piping system of a hot water heating boiler connected to heating coils located in air handling appliances where they may be exposed to refrigerated air circulation must be equipped with flow control valves or other automatic means to prevent gravity circulation of the boiler water during the cooling cycle. A boiler installed above radiation level, or as required by the authority having jurisdiction, must be provided with a low water cutoff device either as a part of the boiler or at the time of boiler installation. 4A.3 Water Flow Requirements — Boiler A hydronic heating (closed loop) application recirculates the same fluid in the piping system. As a result, no new minerals or oxygen are introduced into the system. To ensure a proper operating temperature leading to long boiler life, a flow rate has been established based on the fluid temperature rise for this specific size boiler. Pump-mounted boilers can be ordered for use in primary secondary piping systems. The pumps used are sized for the head loss through the heater, plus 30 feet (9.1 m) of full-sized piping (same size as boiler outlet) and a normal number of fittings. Table 8 specifies water flow rates for boilers, which will enable the user to size a pump. The head loss shown is for the heater only, and the user will need to add the head loss of the system piping to properly size the pump. The minimum inlet water temperature for the Brute Deluxe is 120°F (49°C) to avoid condensing on the copper coils. 4A.4 Freeze Protection — Boiler Boiler installations are not recommended in areas where the danger of freezing exists unless proper precautions are made for freeze protection. A non toxic, heating system, anti-freeze may be added to the hydronic system provided that the concentration does not exceed 50% and the anti freeze contains an anti foamant. When a 50/50 mixture is used, increase the water flow requirements by 15%, and increase the head loss requirements by 20%. Power outage, interruption of gas supply, failure of system components, activation of safety devices, etc., may prevent a boiler from firing. Any time a boiler is subjected to freezing conditions, and the boiler is not able to fire, and/or the water is not able to circulate, there is a risk of freezing in the boiler or in the pipes in the system. When water freezes, it expands. This can result in bursting of pipes in the system, or damage to the boiler, which could result in leaking or flooding conditions. IMPORTANT NOTES: Different glycol products may provide varying degrees of protection. Glycol products must be maintained properly in a heating system, or they may become ineffective. Consult the glycol specifications, or the glycol manufacturer, for information about specific products, maintenance of solutions, and set up according to your particular conditions. Never use ethylene glycol (automotive antifreeze). Brute Deluxe (200, 300, 400) Page 17 Size 20°F 25°F 30°F 35°F flow gpm H/L feet flow gpm H/L feet flow gpm H/L feet flow gpm H/L feet 200 17 1.6 14 1.0 11 0.7 10 0.5 300 26 3.5 20 2.3 17 1.6 15 1.2 400 34 6.3 27 4.0 23 2.8 19 2.1 Metric Equivalent Size 11°C 14°C 17°C 19°C flow lpm H/L m flow lpm H/L m flow lpm H/L m flow lpm H/L m 200 64 0.5 51 0.3 43 0.2 37 0.2 300 97 1.1 77 0.7 64 0.5 55 0.4 400 129 1.9 103 1.2 86 0.9 74 0.6 Notes: gpm = gallons per minute, lpm = liters per minute, H/L = head loss, ft = head loss in feet, m = head loss in meters. Maximum temperature rise is 35°F (19°C), as shown. Head loss is for boiler’s heat exchanger only. N/R = not recommended. Table 8. Water Flow Requirements - BMT2H. Figure 4. Hydronic Piping — Multiple Boilers, Primary Secondary System. Page 18 Bradford White Corp. Figure 5. Hydronic Piping — Multiple Boile...
Questo manuale è adatto anche per i modelli :scaldabagno - BRUTE DELUXE BMT2H (4 mb)