Table Of Contents; General Safety Information; Precautions; Liquid Petroleum Models - A.O. Smith 650A, 740A Installation & Operation Manual

In addition to these instructions, the equipment shall be installed
in accordance with those installation regulations 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.

TABLE OF CONTENTS

ROUGH-IN-DIMENSIONS ........................................................................ 2
FOREWORD ....................................................................................... 2,3
TABLE OF CONTENTS ........................................................................... 3
GENERAL SAFETY INFORMATION ....................................................... 3
Precautions ................................................................................... 3
Liquid Petroleum Models ................................................................ 3
Chemical Vapor Corrosion ........................................................ 3,4
Improper Combustion .................................................................... 4
EXTENDED NON-USE PERIODS ............................................................. 4
Cathodic Protection ....................................................................... 4
Insulation Blankets ......................................................................... 4
High Altitude Installations .............................................................. 4
FEATURES ............................................................................................. 4
Low Emmission Control ................................................................. 4
High Limit Switch (E.C.O.) ......................................................... 4,5
Dishwashing Machine Requirement ............................................. 5
INSTALLATION INSTRUCTIONS ............................................................. 5
Required Ability ............................................................................. 5
Uncrating ....................................................................................... 5
Locating the Heater ................................................................... 5,6
Hard Water .................................................................................... 6
Clearances .................................................................................... 6
Air Requirements ........................................................................... 6
Venting ....................................................................................... 6,7
Vertical Venting - For BTP Models ................................................ 7
Horizontal (Side-wall) Venting - For BTPV Models .................. 7,8
Direct Venting - For BTPV Models .......................................... 9-11
Gas Piping ............................................................................. 11-12
Gas Meter Size ............................................................................12
Gas Pressure Regulation ............................................................ 12
Gas Valves ............................................................................ 12,13
Water Line Connections .............................................................. 13
Thermometers ............................................................................. 13
Relief Valve ................................................................................. 13
INSTALLATION DIAGRAMS ........................................................... 14-17
Manifold Kits ................................................................................ 18

GENERAL SAFETY INFORMATION

PRECAUTIONS

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 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.

LIQUID PETROLEUM MODELS

Water heaters for propane or liquefied petroleum gas (LPG)
WARNING
In the absence of local codes, the installation must conform with
the instructions as outlined in the latest publication of National
Fuel Gas Code (NFPA-54/ANSI Z223.1) and National Electric
Code (NFPA-70). These manuals can be purchased from the
Canadian Standards Association Laboratories, 8501 East
Pleasant Valley Road, Cleveland, OH 44131, National Fire
Protection Association, 1 Batterymarch Park, Quincy MA 02269.
PAGE
Heater Wiring ............................................................................... 19
START UP ............................................................................................ 19
Important ...................................................................................... 19
Filling ............................................................................................ 19
Purging ......................................................................................... 19
Wiring Diagram ...................................................................... 20,21
Lighting and Operating Label ...................................................... 22
Sequence of Operation ............................................................... 23
Water Temperature Control ......................................................... 23
Adjustment Procedure (Initial Start-Up) ................................ 23,24
Adjustment Procedure for Fire-Rate, Low Nox and
High Elevation (Fine-Tune) .................................................... 24-26
GENERAL INFORMATION .................................................................... 27
Power Burner .............................................................................. 27
Thermostat .................................................................................. 27
High Limit ...................................................................................... 27
MAINTENANCE .................................................................................... 27
General ........................................................................................ 27
Maintenance Schedule ................................................................ 27
Electrical Servicing ...................................................................... 27
Flushing ....................................................................................... 27
Draining ........................................................................................ 28
Sediment Removal ....................................................................... 28
Lime Scale ................................................................................... 28
Relief Valve ........................................................................... 28,29
Circulating Pump .......................................................................... 29
Low Emission Power Burner ...................................................... 29
Cleaning Flues ............................................................................. 29
Barometric Draft Control ............................................................. 29
Vent System ................................................................................ 29
CHECKLIST AND SERVICE INFORMATION .................................... 29-30
TROUBLESHOOTING ..................................................................... 30-32
Replacement Parts ...................................................................... 32
WARRANTY ........................................................................................ 33
NOTES ........................................................................................... 34,35
are different from natural gas models. A natural gas heater
will not function safely on LP gas and no attempt should be
made to convert a heater from natural gas to LP gas.
BTP(V)-540A, 650A & 740A models are not available for use
with Liquefied Petroleum or LP gas. If you have obtained a
BTP(V)-540A, 650A or 740A model with the intent to use it
with Liquefied Petroleum, LP gas - STOP! Immediately contact
your dealer to obtain a correct model.

CHEMICAL VAPOR CORROSION

CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY
OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN
CHEMICAL VAPORS. SUCH CORROSION MAY RESULT IN
FAILURE AND RISK OF ASPHYXIATION.
Spray can propellants, cleaning solvents, refrigerator and air
conditioning refrigerants, swimming pool chemicals, calcium
3
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WARNING