Ao-smith NW 37-670 User Manual

1DURA-POWER MODELS NW 37- 670COMMERCIAL ELECTRIC WATER BOILERS• Installation • Operation • Service • Maintenance • Limited WarrantyPLACE THES

104. Close the vent as water starts to flow from the opening. Place themake-up water valve in the desired position. The boiler is nowready for START

11• Use a twisting, pulling action to remove elements scaledbeyond the size of the tank opening.• Brush loose scale from elements.• Silicates, sulfate

12NW-37 THRU NW-670 ELECTRIC HOT WATER BOILER LIMITED WARRANTYA.O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the own

2DIMENSIONAL DATASIZES AND DATA 45KW THRU 720KW Model Number Inlet* & BoilerPrefix Gal.Cap. Std.KWInput D E F G*

3SIZES AND DATA 780KW THRU 3300KW Model Number Inlet* & BoilerPrefix Gal.Cap. Std.KWInput D E F G** H J

4ELECTRICAL/RECOVERY DATAMODEL AND RATING PLATEWATER BOILER SPECIFICATIONSModel NumberGal. Std. KW BTU Output Gal./Hr. Number of Number of Standard Nu

5APPROVALSThese designs comply with requirements of Underwriters Laboratoriesand bear the U.L. label on the cabinet.All models are built to the standa

6IMPORTANTIT IS RECOMMENDED THAT A QUALIFIED SERVICE TECHNICIANPERFORM THE INITIAL FIRING OF THE BOILER. AT THIS TIMETHE USER SHOULD NOT HESITATE TO

7Calculating Amperage/Overcurrent ProtectionThe boiler is factory wired for connection to three wire single-phaseor three and four wire three-phase br

8ELECTRICAL CONFIGURATION TABLEBoiler Type Voltage Between Control ElementsNameplate of Boiler Terminal Circuit Quantity ElementMarkings Service Lugs

9WIRING DIAGRAM 480V THREE-PHASE (WYE)SYSTEM CLEANINGThe hot water system should be internally cleaned and flushed toremove contaminants which may hav