Assessments - 2, GPA: 4
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• Check for water leaks around elements and proper operation when boiler is filled. • Replace insulation and cabinet panel. CHECKLIST Before calling for service, check the following points to see if the cause of trouble can be identified and corrected. Reviewing this checklist may eliminate the need of a service call and quickly restore the boiler to service. The illustration on page 5 identifies the location of most of the boiler components. BE SURE TO TURN OFF THE ELECTRICITY WHEN CHECKING EQUIPMENT. Not enough or no heat 1. Be certain the electrical disconnect switch serving the boiler is in the ON position. The pilot switch(es) on the cabinet front should be on. • In some installations the boiler electrical service may be limited by the power company or boiler controls. If the boiler operates on a controlled circuit heat may be effected. 2. Check the fuses. • The electrical disconnect switch usually contains fuses. • The boiler has fuses located behind the cabinet door, see page 5 for location. 3. If the water was excessively hot, and is now cold, the high temperature cutoff may have operated (manual reset equipped models). • To reset, turn off electricity and remove the back panel and push the reset button. • Repeated operation of the high temperature cutoff shouldbe investigated by your servicer. 4. The capacity of the boiler may have been exceeded by a large demand for heat. • Large demands require a recovery period to restore water temperature. 5. Sediment or lime scale may be affecting boiler operation. Refer to MAINTENANCE for details. Water is too hot 1. Refer to TEMPERATURE REGULATION. Boiler makes sounds 1. Sediment or lime scale accumulation on the elements may cause sizzling and hissing noises when the boiler is operating. • The sounds are normal , however, the tank bottom and elements should be cleaned. Refer to MAINTENANCE for details. 2. Some of the electrical components of the boiler make sounds which are normal. • Contactors will “click” or snap as the boiler starts and stops. • Transformers and contactors often hum. Water leakage is suspected 1. Check to see if the drain valve is tightly closed. 2. If the outlet of the relief valve is leaking it may represent: • Excessive water pressure or air in the system. • Faulty relief valve. 3. Examine the flange area of the elements and tank cleanout for gasket leakage. • Tighten the bolts or, if necessary, follow the WATER AND LIME SCALE REMOVAL procedure to replace the gaskets. SYSTEM WATER TEST System water test Review SYSTEM CLEANING section, for a description of six problems which result from loss of system chemical stability. Chemical stability is checked by: 1. Draw off water from system. Is it dirty, discolored or odorous? 2. What is the pH of the system water? It should be neutral or slightly alkaline. 3. Does “air” purged from system vents burn? If so, the “air” is actually gas. If any of the above conditions are present, all waterways should be cleaned and the water adjusted to an alkaline condition. If you cannot identify or correct the source ofmalfunction: 1. Place the boiler electrical disconnect switch in the OFF position. 2. Close the make-up water inlet valve to the boiler. 3. Contact your servicer. 11 NW-37 THRU NW-670 ELECTRIC HOT WATER BOILER LIMITED WARRANTY A.O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this boiler. 1. THE TANK If the tank in this boiler shall prove upon examination by the warrantor to have leaked due to natural corrosion from water therein, during the FIRST year after initial installation, the warrantor will at its option, repair it or provide a replacement tank less elements a n d controls of equivalent size and then current model. Some government agencies are requiring energy efficient standards for boilers. In the event regulations prohibit sale of a model of equivalent size and construction, A.O. Smith will provide a model which complies with the regulations of your area, in which case the consumer will be charged the difference in price between the like replacement and the energy efficient model required. The warranty on the repair or replacement of the part, portion or tank will be limited to the unexpired term of the original warranty. 2. ALL OTHER PARTS If within ONE year after initial installation of this boiler, any part or portion shall prove upon examination by the warrantor to be defective in material or workmanship, the warrantor will repair or replace such part or portion at its option. 3. CONDITIONS AND EXPECTATIONS This warranty shall apply only when the boiler is installed in accordance with local plumbing and building codes, ordinances and regulations, the printed instructions provided with it and good industry practices. In addition, a pressure relief valve, approved by the American Society of Mechanical Engineers, must have been installed. This warranty shall apply only when the boiler is used: a. (1) at temperatures not exceeding the maxi...
Este manual também é adequado para os modelos :Aquecedores de Água - NW 37-670 (244.06 kb)
Aquecedores de Água - NW 37-670 (244.06 kb)
Aquecedores de Água - NW 37-670 (244.06 kb)