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Instruction Manual
coMMercIal electrIc BoIlers
Models nw 37-670
InstallatIon - operatIon - serVIce -
MaIntenance - lIMIted warranty
A DIVISION OF A. O. SMITH CORPORATION
RENTON, WASHINGTON
www.hotwater.com
asMe
Thank you for buying this energy efficient boiler
from us. We appreciate your confidence in our
products.
place these InstructIons adjacent to BoIler and notIfy owner to keep for future reference.
PRINTED 0110
316392-000
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Summary of Contents for A.O. Smith NW 37-670
- Page 1 Instruction Manual coMMercIal electrIc BoIlers Models nw 37-670 InstallatIon - operatIon - serVIce - MaIntenance - lIMIted warranty A DIVISION OF A. O. SMITH CORPORATION RENTON, WASHINGTON www.hotwater.com asMe Thank you for buying this energy efficient boiler from us. We appreciate your confidence in our products.
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Page 2: Safe Installation, Use And Service
safe InstallatIon, use and serVIce Your safety and the safety of others is extremely important in the installation, use, and servicing of this boiler. Many safety-related messages and instructions have been provided in this manual and on your own boiler to warn you and others of a potential injury hazard. -
Page 3: General Safety Information
General safety InforMatIon precautIons hydroGen Gas (flaMMaBle) DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER WATER. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system which has been under water. If the unit is exposed to the following, do not operate boiler until all corrective steps have been made by a qualified service agency. -
Page 4: Table Of Contents
taBle of contents SAFE INSTALLATION, USE AND SERVICE............2 Calculating Amperage/Overcurrent Protection ..........12 Boiler Circuits ....................12 GENERAL SAFETY INFORMATION ...............3 Control Circuits .....................12 Precautions ....................3 WIRING DIAGRAMS .....................13 Hydrogen Gas (Flammable) ................3 OPERATION ......................15 TABLE OF CONTENTS ...................4 Important ......................15 INTRODUCTION .....................4 General ......................15 Preparing for the Installation ................4 High Temperature Limit ................15... -
Page 5: Dimensions And Capacities Data
dIMensIon data sIZes and data nw37 thru nw150 Model Number Inlet* & Boiler Outlet* Drain Prefix Gal. Cap. Std. KW Input 12 1/2 12 1/2 12 1/2 12 1/2 105K 12 1/2 120K 12 1/2 150K 12 1/2 180K 12 1/2 210K 12 1/2 240K... - Page 6 sIZes and data nw220 thru 670 Model Number Inlet* & Boiler Std. KW Outlet* Drain Prefix Gal. Cap. Input 780K 25 1/2 5 1/2 1 1/2 840K 25 1/2 5 1/2 1 1/2 900K 25 1/2 5 1/2 1 1/2 960K 25 1/2 5 1/2...
- Page 7 dIMensIon data (cont’d) BoIler specIfIcatIons (standard) Model Number Amperage 3 Phase Gal./Hr. Number Number Standard Number and 100°F of Steps KW of Steps Std. KW Output Prefix Gal. Cap. 208V 240V 480V 575V Rise Elements Input 153,585 1@45 204,720 1@60 255,975 1@75 307,170...
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Page 8: Features And Components
features and coMponents actual confIGuratIon May Vary. -
Page 9: Approvals
approVals asMe Model and ratInG locatInG the BoIler facts to consIder aBout the locatIon Near a floor drain. The boiler should be located in an area where leakage of the tank or connections will not result in damage to the area adjacent to the boiler or to lower floors of the structure. -
Page 10: Installation
InstallatIon requIred aBIlIty Installation and service of this boiler requires ability equivalent to that of a qualified agency (page 2) in the field involved. Plumbing and electrical work is required. General The installation must conform with these instructions and the local code authority having jurisdiction and the requirements of the power company. -
Page 11: Closed Water Systems
closed water systeMs water pressure due to thermal expansion. Thermal expansion can cause premature tank failure (leakage). This type of failure is not covered under the limited warranty. Thermal expansion Water supply systems may, because of code requirements or such conditions as high line pressure, among others, have installed can also cause intermittent pressure relief valve operation: water devices such as pressure reducing valves, check valves, and... -
Page 12: Electrical Data
electrIcal data General Refer to ELECTRICAL CONFIGURATION TABLE, below, and wiring diagram provided with your boiler before completing connections to electrical supply. Check the boiler model and rating plate information against the characteristics of the branch circuit electrical supply. Do not connect NOTE: Wiring diagrams in this manual are typical examples. -
Page 13: Wiring Diagrams
wIrInG dIaGraMs wIrInG dIaGraMs NOTE(S): IF A MANUAL RESET HLMT IS USED, THE SECOND AUTO RESET HLMT SWITCH IS NOT USED. STD. WIRING dIaGraM 1. OPTIONAL OR FIELD WIRING AS REQ’D three phase delta wIth therMostat NOTE(S): IF A MANUAL RESET HLMT IS USED, THE SECOND AUTO RESET HLMT SWITCH IS NOT USED. - Page 14 1 OFF ON 2200 2 OFF ON 135 3 OFF ON 4-20MA 4 OFF ON 0-10VDC 5 DS PROP 6 PROG 7 OFF 8 SEC NOTE(S): SUBSTITUTE A MANUAL RESET HLMT SWITCH FOR ONE(1) OF DELAY 1 DELAY 2 THE AUTO RESET HLMT SWITCHES. DELAY 3 STD.
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Page 15: Operation
operatIon 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 OPERATION the hot water system should be internally cleaned and flushed to remove any contaminants which may have accumulated during installation. -
Page 16: Temperature Controls
teMperature controls Always close and lock the cabinet door after making a temperature adjustment. Turn on electricity. The boilers covered in this instruction manual are equipped with (adjustable) thermostat or step control to regulate water temperature draInInG and other controls to provide safety features. See the wiring diagrams on page 13 &... -
Page 17: Maintenance
MaIntenance Boiler maintenance includes periodic tank flushing and cleaning, and Failure to clean the system may cause: removal of lime scale from the heating elements. Circulating pumps should be oiled. 1. Poor heating due to formation of gas. • Residential pipe dope, thread cutting oil, solder flux, dirt and other foreign materials breakdown to form gas. -
Page 18: Troubleshooting Checklist
Lime scale should be removed from the elements by dissolving the • Place limed ends of heating elements into UN•LIME delimer accumulation in UN•LIME® delimer. UN•LIME is a non-muriatic and allow scale to dissolve. Do not permit delimer or water to delimer, available through your dealer or distributor. -
Page 19: Warranty
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 and controls of equivalent size and then current model. - Page 20 A DIVISION OF A. O. SMITH CORPORATION RENTON, WASHINGTON Technical Support: 800 527-1953 Parts Department: 800 433-2515 www.hotwater.com...
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