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A.O. Smith NW 37-670 manual

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Table of contents for the manual

  • Page 1

    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. PRINTED IN U.[...]

  • Page 2

    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 W 37 60K 32 30 12 42 12 1 /2 - - 20 4 42 3 1 N W 37 75K 32 30 12 42 12 1 /2 - - 20 4 42 2 1 N W 37 90K 32 30 12 42 12 1 /2 - - 20 4 42 3 1 N W 37 105K[...]

  • Page 3

    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 60 50 25 71 21 2 25 1/2 30 5 1/ 2 5 1 1/ 2 N W 220 900K 60 50 25 71 21 2 25 1/2 30 5 1/ 2 5 1 1/ 2 N W 220 960K 60 50 25 71 21 2 25 1/2 30 5 1/ 2 5 1[...]

  • Page 4

    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. Input 100°F Rise Elements Steps and KW of Steps 208v 240V 480V 575V N W 37 45 K 153,585 180 3 1 1@45 128 108 55 45 N W 37 60 K 204,720 240 4 1 1@60 171[...]

  • Page 5

    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. The ASME plate is located on the tank above the cleanout open[...]

  • Page 6

    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. BEFORE FILLING THE SYSTEM FOR OPERA TION the hot water system should be inter[...]

  • Page 7

    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. An amperage table is on page 4 of this manual. The [...]

  • Page 8

    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 (1 Phase) Contractor V oltage 1 120 1 208 208 3 Delta (With 12 0 1 2 08 Neutral) 1 120 1 2 40 240 3 Delta 120 1 240 480 3 Wy e* 1 20 1 or 2 277 480 3[...]

  • Page 9

    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. Failure to clean the system may cause: 1. Poor heating due to fo[...]

  • Page 10

    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. ST ART UP The following checks should be made by the installer when the boiler is placed into operation for the firs[...]

  • Page 11

    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. 5. Lime scale removal:[...]

  • Page 12

    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 . 1. THE T ANK 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[...]