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taBle of contents

SAFE INSTALLATION, USE AND SERVICE...........................................................2
GENERAL SAFETY INFORMATION .......................................................................3
 

Precautions ....................................................................................................3

 

Hydrogen Gas (Flammable)

 ...........................................................................3

TABLE OF CONTENTS ...........................................................................................4
INTRODUCTION .....................................................................................................4
 

Preparing for the Installation ..........................................................................4

DIMENSIONS AND CAPACITIES DATA .................................................................5
FEATURES AND COMPONENTS ..........................................................................8
APPROVALS ...........................................................................................................9
MODEL AND RATING .............................................................................................9
LOCATING THE NEW BOILER ...............................................................................9
 

Facts to Consider About the Location ............................................................9

INSTALLATION .....................................................................................................10
 

Required Ability ............................................................................................10

 

General ........................................................................................................10

 

Pressure Relief Valve ...................................................................................10

 

Water Line Connections ...............................................................................10

 

Closed Water Systems .................................................................................11

 

Thermal Expansion ......................................................................................11

ELECTRICAL DATA ...............................................................................................12
 

General ........................................................................................................12

 

Branch Circuit ...............................................................................................12

IntroductIon

Thank  You  for  purchasing  this  boiler.  Properly  installed  and 

maintained, it should give you years of trouble free service. 

Abbreviations Found In This Instruction Manual:

•    ANSI - American National Standards Institute

•    ASME - American Society of Mechanical Engineers

•    GAMA - Gas Appliance Manufacturer’s Association        

•    NEC - National Electrical Code

•    NFPA - National Fire Protection Association

•    UL - Underwriters Laboratory

preparInG for the InstallatIon

1.  Read  the  “General  Safety”  section  of  this  manual  first  and 

then the entire manual carefully. If you don’t follow the safety 

rules, the boiler may not operate safely. It could cause DEATH, 

SERIOUS BODILY INJURY AND/OR PROPERTY DAMAGE. 

 

This manual contains instructions for the installation, operation, 

and maintenance of the electric boiler. It also contains warnings 

throughout  the  manual  that  you  must  read  and  be  aware  of. 

All  warnings  and  all  instructions  are  essential  to  the  proper 

operation  of  the  boiler  and  your  safety.  READ  THE  ENTIRE 

MANUAL BEFORE ATTEMPTING TO INSTALL OR OPERATE 

THE BOILER.

 

Detailed  installation  diagrams  are  in  this  manual.  These 

diagrams  will  serve  to  provide  the  installer  with  a  reference 

for  the  materials  and  method  of  piping  suggested.  IT 

IS  NECESSARY  THAT  ALL  WATER  PIPING  AND  THE 

ELECTRICAL  WIRING  BE  INSTALLED  AND  CONNECTED 

AS SHOWN IN THE DIAGRAMS.

 

Particular  attention  should  be  given  to  the  installation  of 

thermometers  at  the  locations  indicated  in  the  diagrams  as 

these are necessary for checking the operation of the heater.

 

Be sure to turn off power when working on or near  the electrical 

system  of  the  heater.  Never  touch  electrical  components 

with  wet  hands  or  when  standing  in  water.  When  replacing 

fuses always use the correct size for the circuit. See page 12 

through 14.

 

The principal components of the heater are identified on page 8. 

The model and rating plate on page 9 interprets certain markings 

into useful information. Both of these references should be used 

to identify the heater, its components and optional equipment.

2.  The  installation  must  conform  with  these  instructions  and  the 

local  code  authority  having  jurisdiction  and  the  requirements 

of the power company. In the absence of code requirements, 

follow NFPA-70 (current edition). The National Electrical Code 

may  be  ordered  from:  National  Fire  Protection Association,  1 

Batterymarch Park, Quincy, MA 02269.

3.  If after reading this manual you have any questions or do not 

understand  any  portion  of  the  instructions,  call  the  toll  free 

number on the back cover for further assistance. 

 

A sample rating plate and barcode tag are shown on page 9 of 

this manual. In order to expedite your request, please have the 

serial number and item ID from the barcode tag available for the 

technician.

4.   Carefully plan your intended placement of the boiler. Examine 

the location to ensure the boiler complies with the “Locating the 

New Boiler” section in this manual.

 

Installation and service of this boiler requires ability equivalent 

to that of a licensed tradesman or qualified agency (page 2) in 

the field involved. Plumbing and electrical work are required.

5.  For  installation  in  California  this  boiler  must  be  braced  or 

anchored to avoid falling or moving during an earthquake. See 

instructions for correct installation procedures. Instructions may 

be obtained from California Office of the State Architect, 1102 Q 

Street, Suite 5100, Sacramento, CA 95811.

6.  Massachusetts  Code  requires  this  boiler  to  be  installed  in 

accordance with Massachusetts 248-CMR 2.00: State Plumbing 

Code and 248-CMR 5.00.

 

Calculating Amperage/Overcurrent Protection .............................................12

 

Boiler Circuits ...............................................................................................12

 

Control Circuits .............................................................................................12

WIRING DIAGRAMS .............................................................................................13
OPERATION ..........................................................................................................15
 

Important ......................................................................................................15

 

General ........................................................................................................15

 

High Temperature Limit ................................................................................15

 

Filling the Boiler ............................................................................................15

 

Initial Start Up ...............................................................................................15

 

Temperature Regulation ...............................................................................15

 

Temperature Controls ...................................................................................16

 

Draining ........................................................................................................16

MAINTENANCE ....................................................................................................17
 

Schedule ......................................................................................................17

 

System Cleaning ..........................................................................................17

 

Flushing ........................................................................................................17

 

Sediment Removal .......................................................................................17

 

Lime Scale Removal ....................................................................................17

TROUBLESHOOTING CHECKLIST

 .....................................................................18

 

Not Enough or No Hot Water .......................................................................18

 

Water is Too Hot ...........................................................................................18

 

Boiler Makes Strange Sounds ......................................................................18

 

Leakage Checkpoints ...................................................................................18

WARRANTY ..........................................................................................................19

Содержание NW 37-670

Страница 1: ...ep for future reference COMMERCIAL ELECTRIC BOILERS Thank you for buying this energy efficient boiler from us We appreciate your confidence in our products MODELS NW 37 670 INSTALLATION OPERATION SERV...

Страница 2: ...the type of hazard what can happen if you do not follow the safety message and how to avoid the risk of injury The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of Ca...

Страница 3: ...ay also cause erratic control system operation on ELECTRONIC CONTROL models This boiler must be connected to a grounded metal permanent wiring system or an equipment grounding conductor must be run wi...

Страница 4: ...hen standing in water When replacing fuses always use the correct size for the circuit See page 12 through 14 The principal components of the heater are identified on page 8 The model and rating plate...

Страница 5: ...4 4 4 3 3 3 3 1 1 1 1 NW NW NW NW NW 96 96 96 96 96 330K 390K 420K 450K 480K 36 36 36 36 36 38 38 38 38 38 16 16 16 16 16 69 1 2 69 1 2 69 1 2 69 1 2 69 1 2 17 17 17 17 17 1 1 2 1 1 2 1 1 2 1 1 2 1 1...

Страница 6: ...1800K 1860K 1980K 2100K 66 66 66 66 56 56 56 56 28 28 28 28 90 1 2 90 1 2 90 1 2 90 1 2 25 1 2 25 1 2 25 1 2 25 1 2 2 1 2 2 1 2 2 1 2 2 1 2 30 30 30 30 33 33 33 33 7 3 4 7 3 4 7 3 4 7 3 4 8 8 8 8 2 2...

Страница 7: ...60 2 90 4 90 6 60 1501 1668 1299 1443 648 720 792 864 542 602 663 723 NW NW NW NW NW NW NW 220 220 220 220 220 220 220 780K 840K 900K 960K 1020K 1080K 1140K 2 662 140 2 866 920 3 071 700 3 276 480 3 4...

Страница 8: ...8 FEATURES AND COMPONENTS ACTUAL CONFIGURATION MAY VARY...

Страница 9: ...the area adjacent to the boiler or to lower floors of the structure 3 The discharge opening of the temperature and pressure relief valve should always be piped to an open drain 4 Close to the point o...

Страница 10: ...ut being certain the boiler is filled with water and a properly sized pressure relief valve is installed in the relief valve opening provided The pressure rating of the relief valve should be equal to...

Страница 11: ...ng increase in 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 can a...

Страница 12: ...th this computation the next higher standard rating or setting should be selected Boiler Circuits The boiler s electrical components are pictured and identified on page 8 The model and rating plate il...

Страница 13: ...TH THERMOSTAT NOTE S 1 IF A MANUAL RESET HLMT IS USED THE SECOND AUTO RESET HLMT SWITCH IS NOT USED STD WIRING OPTIONAL OR FIELD WIRING AS REQ D NOTE S 1 IF A MANUAL RESET HLMT IS USED THE SECOND AUTO...

Страница 14: ...ON LIGHT 1 OFF ON 2200 2 OFF ON 135 3 OFF ON 4 20MA 4 OFF ON 0 10VDC 5 DS PROP 6 PROG UN 7 OFF VER 8 SEC MN 1 DELAY 1 2 DELAY 2 3 DELAY 3 4 1 5 2 6 4 7 5 8 16 THE ABOVE DIP SWITCH SETTINGS ARE AN EXAM...

Страница 15: ...y be in the control circuit in addition to the automatic high limit previously described The control has an adjustable range of 110 F to 290 F and activates and locks on a temperature increase When th...

Страница 16: ...proximate time to burn relationship for normal adult skin Water Temperature Time to Produce 2nd 3rd Degree Burns on Adult Skin 180 F 82 C 160 F 82 C 150 F 82 C 140 F 82 C 130 F 82 C 120 F 82 C 80 F 82...

Страница 17: ...dential pipe dope thread cutting oil solder flux dirt and other foreign materials breakdown to form gas This is indicated by a continuing need for purging even through the system is closed 2 Pump seal...

Страница 18: ...switch serving the boiler is in the ON position The pilot switch es on the cabinet front should be on In some installations the boiler electrical service may be limited by the power company or boiler...

Страница 19: ...ges for forwarding the new tank or replacement part from the nearest distributor and returning the claimed defective tank or part to such distributor c All cost necessary or incidental for any materia...

Страница 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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