Instruction/ maintenance manual of the product NW 37-670 A.O. Smith
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1 DURA-POWER MODELS NW 37- 670 COMMERCIAL ELECTRIC W A TER BOILERS • Inst allation • Operation • Service • Maintenance • Limited Warranty PLACE THESE INSTRUCTIONS ADJACENT T O THE BOILER AND NOTIFY OWNER T O KEEP FOR FUTURE REFERENCE.BE SURE THA T THE W ARRANTY INFORMA TION HAS BEEN FILLED IN ON COMPLETION OF INST ALLA TION.
2 DIMENSIONAL DA T A SIZES AND DA T A 45KW THRU 720KW Model Number Inlet* & Boiler Prefix Gal.Cap. Std.KWInput D E F G** H J K S T U Outlet* Drain N W 37 45K 32 30 12 42 12 1 /2 - - 20 4 42 3 1 N .
3 SIZES AND DA T A 780KW THRU 3300KW Model Number Inlet* & Boiler Prefix Gal.Cap. Std.KWInput D E F G** H J K S T Outlet* Drain N W 220 780K 60 50 25 71 21 2 25 1/2 30 5 1/ 2 5 1 1/ 2 N W 220 840K.
4 ELECTRICAL/RECOVER Y DA T A MODEL AND RA TING PLA TE W A TER BOILER SPECIFICA TIONS Model Number Gal. Std. KW BTU Output Gal./Hr . Number of Number of Standard Number Amperage 3 Phase Prefix Cap.
5 APPROV ALS These designs comply with requirements of Underwriters Laboratories and bear the U.L. label on the cabinet. All models are built to the standards of Section lV of the American Society of Mechanical Engineers. Boiler and Pressure Code, inspected and identified by this symbol.
6 IMPORT ANT IT IS RECOMMENDED THA T A QUALIFIED SER VICE TECHNICIAN PERFORM THE INITIAL FIRING OF THE BOILER. A T THIS TIME THE USER SHOULD NOT HESIT A TE TO ASK THE TECHNICIAN ANY QUESTIONS WHICH THEY MA Y HA VE IN REGARD TO THE OPERA TION AND MAINTENANCE OF THE BOILER.
7 Calculating Amperage/Overcurrent Protection The boiler is factory wired for connection to three wire single-phase or three and four wire three-phase branch circuits. In addition, a ground conductor may be required. A diagram of the wiring is furnished with the boiler for the electrician’s use.
8 ELECTRICAL CONFIGURA TION T ABLE Boiler T ype V olt age Between Control Elements Nameplate o f Boiler T erminal Circuit Quantity Element Markings Service Lugs V ol t age Per Operating V oltage Phase.
9 WIRING DIAGRAM 480V THREE-PHASE (WYE) SYSTEM CLEANING The hot water system should be internally cleaned and flushed to remove contaminants which may have accumulated during installation. System cleaning provides chemical stability necessary for component life and system performance.
10 4. Close the vent as water starts to flow from the opening. Place the make-up water valve in the desired position. The boiler is now ready for ST ART UP and TEMPERA TURE REGULA TION if being placed in operation for the first time.
11 • Use a twisting, pulling action to remove elements scaled beyond the size of the tank opening. • Brush loose scale from elements. • Silicates, sulfates and aluminates must be removed by scraping or other mechanical means. Lime scale dissolvents will not remove these types of scale which are occasionally encountered.
12 NW -37 THRU NW-670 ELECTRIC HOT W A TER BOILER LIMITED W ARRANTY A.O. Smith Corporation, the warrantor , extends the following LIMITED WARRANTY to the owner of this boiler .
An important point after buying a device A.O. Smith NW 37-670 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought A.O. Smith NW 37-670 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data A.O. Smith NW 37-670 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, A.O. Smith NW 37-670 you will learn all the available features of the product, as well as information on its operation. The information that you get A.O. Smith NW 37-670 will certainly help you make a decision on the purchase.
If you already are a holder of A.O. Smith NW 37-670, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime A.O. Smith NW 37-670.
However, one of the most important roles played by the user manual is to help in solving problems with A.O. Smith NW 37-670. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device A.O. Smith NW 37-670 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
