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A.O. Smith NW 150 Instruction Manual

Other manuals for NW 150: Instruction Manual
Manual is about: COMMERCIAL ELECTRIC BOILERS

Summary of NW 150

  • Page 1

    1 dura-power models nw 37- 670 commercial electric water boilers • installation • operation • service • maintenance • limited warranty place these instructions adjacent to the boiler and notify owner to keep for future reference.Be sure that the warranty information has been filled in on completion ...

  • Page 2: Dimensional Data

    2 dimensional data sizes and data 45kw thru 720kw model number inlet* & boiler prefix gal.Cap. Std.Kwinput d e f g** h j k s t u outlet* drain nw 37 45k 32 30 12 42 12 1/2 - - 20 4 42 3 1 nw 37 60k 32 30 12 42 12 1/2 - - 20 4 42 3 1 nw 37 75k 32 30 12 42 12 1/2 - - 20 4 42 2 1 nw 37 90k 32 30 12 42 ...

  • Page 3

    3 sizes and data 780kw thru 3300kw model number inlet* & boiler prefix gal.Cap. Std.Kwinput d e f g** h j k s t outlet* drain nw 220 780k 60 50 25 71 21 2 25 1/2 30 5 1/2 5 1 1/2 nw 220 840k 60 50 25 71 21 2 25 1/2 30 5 1/2 5 1 1/2 nw 220 900k 60 50 25 71 21 2 25 1/2 30 5 1/2 5 1 1/2 nw 220 960k 60 ...

  • Page 4: Electrical/recovery Data

    4 electrical/recovery data model and rating plate water boiler specifications 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 nw 37 45k 153,585 180 3 1 1@45 128 108 55 4...

  • Page 5: Features

    5 approvals 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 pla...

  • Page 6: Installation

    6 important it is recommended that a qualified service technician perform the initial firing of the boiler. At this time the user should not hesitate to ask the technician any questions which they may have in regard to the operation and maintenance of the boiler. Before filling the system for operat...

  • 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 ...

  • Page 8

    8 electrical configuration table boiler type voltage between control elements nameplate of boiler terminal circuit quantity element markings service lugs voltage per operating voltage phase (1 phase) contractor voltage 1 120 1 208 208 3 delta (with 120 1 208 neutral) 1 120 1 240 240 3 delta 120 1 24...

  • Page 9: Operation

    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 cle...

  • Page 10: Maintenance

    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 start up and temperature regulation if being placed in operation for the first time. Start up the following checks should be made by the installer when th...

  • 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 occa...

  • Page 12

    12 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...