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Fabricar: Bradford-White Corp Tamaño del archivo: 1.23 mb Nombre del archivo: Idioma del manual:

Check the diagrams thoroughly before starting installation to avoid errors and minimize time and materials cost. 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 downdraft 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. This equipment must be protected against loss of water or loss of water flow by the installation of a safety flow switch in the outlet piping from the boiler. Piping and wiring diagrams show the application of the accessory package for this purpose. HARD WATER Where hard water conditions exist, water softening or the threshold type of water treatment is recommended. This will protect the dishwashers, coffee urns, water boilers, water piping and other equipment. When water softening or water treatment is not practical, a comparatively easy method of periodic lime removal from the boiler may be employed by installing gate valves, drain valve and acid fill opening as shown in CLEANING AND FLUSHING section of this manual. The water temperature in the storage tank is controlled by the Tank Temperature Control. The sensing element is mounted inside the hot water storage tank, see fig's. 31-38. DANGER HOT WATER TEMPERATURES REQUIRED FOR AUTOMATIC DISHWASHER AND LAUNDRY USE CAN CAUSE SCALD BURNS RESULTING IN SERIOUS PERSONAL INJURY AND/OR DEATH. THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH THE PERSON’S AGE AND TIME OF EXPOSURE. THE SLOWER RESPONSE TIME OF CHILDREN, AGED OR DISABLED PERSONS INCREASES THE HAZARDS TO THEM. NEVER ALLOW SMALL CHILDREN TO USE A HOT WATER TAP, OR TO DRAW THEIR OWN BATH WATER. NEVER LEAVE A CHILD OR DISABLED PERSON UNATTENDED IN A BATHTUB OR SHOWER. The tank temperature control is adjustable from 100°F (37.7°C) to 220°F (104.4°C). It is recommended that lower water temperatures be used to avoid the risk of scalding. It is further recommended, in all cases, that the water temperature be set for the lowest temperature which satisfies the user’s hot water needs. This will also provide the most energy efficient operation of the water heater and minimize scale formation. THE WATER HEATER SHOULD BE LOCATED IN ANAREA WHERE THE GENERAL PUBLIC DOES NOT HAVE ACCESS TO SET TEMPERATURES. SETTING THE WATER TEMPERATURE AT 120°F (49°C) WILL REDUCE THE RISK OF SCALDS. Some states or provinces require settings at specific lower temperatures. Below you will find listed the approximate time-to-burn relationship for normal adult skin. Valves for reducing point-of-use temperature by mixing cold and hot water are available. Also available are inexpensive devices that attach to faucets to limit hot water temperatures. Contact a licensed plumber or the local plumbing authority. DETAIL OF TANK FITTING USED WITH MODIFIED RECOVERY AND BOOSTER RECOVERY PIPING DIAGRAMS FIGURE 28 32 3232323232 Temperature Setting Time to Produce 2nd & 3rd Degree Burns on Adult Skin OVER: 170°F (77°C) 160°F (71°C) 150°F (65°C) 140°F (60°C) 130°F (54°C) 120°F (49°C) Nearly instantaneous About 1/2 second About 1-1/2 seconds Less than 5 seconds About 30 seconds More than 5 minutes USE ANTI-SCALD VALVE(S) in the hot water system to reduce the risks of scalds at points of use such as lavatories, sinks and bathing facilities. A change in water temperature in the storage tank lower than the Tank Temperature Control setting will cause the sensor to close its contacts and consequently energize the boiler. If the Tank Temperature Control is out of calibration, replace it with a new one; do not attempt to fix this control. WARNING SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO THE APPLIANCE. LOW WATER CUTOFF A low water cutoff is a safety device which is installed in the boiler piping to prevent the boiler from firing in the event of inadequate water levels in the boiler system. Where required by local code, this optional device is to be installed in the boiler piping at a level above that of the heat exchanger. A float type or an electronic probe type low water cutoff may be used. The manufacturer's installation instructions must be followed. THERMOMETERS Thermometers should be obtained and field installed as shown in the installation diagrams. Thermometers are installed in the system as a means of detecting a possible liming condition in the boiler. An increase of 3°C (5°F) over the normal temperature rise through the boiler is an indication that lime is present. The term "temperature rise" designates the difference between the boiler inlet and outlet water temperature. An increase of 3°C (5°F) above the recorded temperature rise may signify a liming condition in the coils or heat exchanger. Refer to CLEANING AND FLUSHING section of this manual for deliming instructions. Record temperature rise at initi...

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