A.O. Smith ***81-199 Specifications download pdf (Page 3)

FOREWORD

These designs comply with the latest version of the American

National Standard for Gas Water Heaters, Volume III,

ANSI Z21.10.3 - CSA 4.3.

Detailed installation diagrams are found in this manual. These

diagrams will serve to provide the installer with a reference for

the materials and methods of piping necessary. It is highly

essential that all water, gas piping and wiring be installed as shown

on the diagrams.

Particular attention should be given to the installation of

thermometers at the locations indicated on the diagrams as these

are necessary for checking the proper functioning of the heater.

The ***81-140 through ***81-370 models are designed to

operate on either natural or propane gases. HOWEVER, MAKE

SURE the gas on which the heater will operate is the same as

that specified on the heater model and rating plate.

THESE HEATERS MUST NOT BE INSTALLED DIRECTLY ON

COMBUSTIBLE FLOORS.

In addition to these instructions, the equipment shall be installed

in accordance with those installation regulations in force in the

local area where the installation is to be made. These shall be

carefully followed in all cases. Authorities having jurisdiction

should be consulted before installations are made.

The installation must conform to these instructions and the local

code authority having jurisdiction. In the absence of local codes

the installation must comply with the latest editions of the National

Fuel Gas Code, ANSI Z223.1/NFPA 54 and the National Electric

Code, NFPA 70. The former is available from the Canadian

Standards Association, 8501 Pleasant Valley Road, Cleveland,

OH 44131 and both documents are available from the National

Fire Protection Association, 1 Batterymarch Park, Quincy,

MA 02269.

TABLE OF CONTENTS

PAGE

FEATURES AND SPECIFICATIONS ........................................... 2

FOREWORD ............................................................................... 3

GENERAL SAFETY INFORMATION

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

Chemical Vapor Corrosion ...................................................... 3-4

Improper Combustion ............................................................. 4

Liquid Petroleum Models ......................................................... 4

Extended Non-Use Periods ..................................................... 4

Insulation Blankets .................................................................. 4

High Altitude Installation ......................................................... 4-5

FEATURES

High Limit Switch (E.C.O.) ...................................................... 5

Circulating Pump ..................................................................... 5

Dishwashing Machine Requirements ...................................... 5

INSTALLATION INSTRUCTIONS

Required Ability ....................................................................... 5

Uncrating ................................................................................. 5

Locating the Heater ................................................................. 5-6

Clearances .............................................................................. 6

Levelling .................................................................................. 6

Hard Water .............................................................................. 6

Air Requirements .................................................................... 6-7

Mechanical Exhausting of Room Air ....................................... 7

Venting .................................................................................... 7

Barometric Draft Control Assembly ........................................ 7

Vent Connection ...................................................................... 7-8

Drain Valve and Access Panels .............................................. 8

Burner Installation ................................................................... 8

Gas Meter Size-City Gases Only ............................................ 8

Gas Pressure Regulation ........................................................ 8-9

Gas Piping ............................................................................... 9

Heater Wiring Instructions ...................................................... 9-10

Water Line Connection .......................................................... 10

Water (Potable) Heating and Spacing.................................. 10

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

Thermometers (Not Supplied) ............................................... 10

Wiring for ***81-140 thru ***81-370 ....................................... 11

INSTALLATION DIAGRAMS ...................................................... 12-15

Manifold Kits .......................................................................... 16

PRIOR TO START UP

Required Equipment And Ability .......................................... 17

Purging ................................................................................... 17

Water Temperature Control ................................................... 17

Operation & Adjustment Procedure ...................................... 18

Adjustment Procedure ........................................................... 19-20

MAINTENANCE

Maintenance Schedule ......................................................... 20

Flushing .................................................................................. 20

Draining .................................................................................. 20

Sediment Removal ................................................................ 20

Lime Scale Removal ............................................................. 20-21

Relief Valve ........................................................................... 21

Circulating Pump ................................................................... 21

Power Burner .......................................................................... 21

Vent System ............................................................................ 21

Barometric Draft Control ........................................................ 21-22

Electrical Servicing ................................................................ 22

CHECKLIST AND SERVICE INFORMATION ............................ 22-23

TROUBLESHOOTING ................................................................ 23

Replacement Parts ................................................................. 23

PARTS LIST................................................................................ 24-27

PAGE

GENERAL SAFETY INFORMATION

PRECAUTIONS

DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN

UNDERWATER. Immediately call a qualified service technician

to inspect the appliance and to replace any part of the control

system and any gas control which has been under water.

IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT

OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE

BEEN MADE BY A QUALIFIED SERVICEMAN.

1. EXTERNAL FIRE.

2. DAMAGE.

3. FIRING WITHOUT WATER.

4 SOOTING.

Heater must be protected from freezing downdrafts during

shutdown periods.

CHEMICAL VAPOR CORROSION

WARNING

CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY

OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN

CHEMICAL VAPORS WHICH BREAK DOWN INTO ACIDS AT

HIGH TEMPERATURE. SUCH CORROSION MAY RESULT IN

FAILURE AND RISK OF ASPHYXIATION.

1 2 3 4 5 6 7 8 ... 27 28

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A.O. Smith ***81-199 Specifications Page 3

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