A.O. Smith PXHT Instruction Manual
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A.O. Smith PXHT Instruction Manual

A.O. Smith PXHT Instruction Manual

Residential electric water heaters
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GAMA certification applies to all
residential electric water heaters
with capacities of 20 to 120 gallons.
Input rating of 12 Kw or less.
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS
PURCHASED. IF YOU ARE UNSUCCESSFUL, PLEASE WRITE TO THE COMPANY LISTED ON THE RATING PLATE ON THE WATER HEATER.
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
PRINTED IN THE U.S.A 0805
WHEN EVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.

Instruction Manual

RESIDENTIAL ELECTRIC

WATER HEATERS

FOR POTABLE WATER
1
HEATING ONLY
NOT SUITABLE FOR
SPACE HEATING
PART NO. 184639-001
LISTED

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  • Page 1: Instruction Manual

    Instruction Manual RESIDENTIAL ELECTRIC WATER HEATERS FOR POTABLE WATER HEATING ONLY NOT SUITABLE FOR SPACE HEATING LISTED GAMA certification applies to all residential electric water heaters with capacities of 20 to 120 gallons. Input rating of 12 Kw or less. ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS PURCHASED.

  • 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 water heater. Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and others of a potential injury hazard.

  • Page 3: Table Of Contents

    GENERAL SAFETY TABLE OF CONTENTS SAFE INSTALLATION, USE AND SERVICE ......2 Temperature Adjustment ..........11 GENERAL SAFETY ..............3 FOR YOUR INFORMATION ............. 12 TABLE OF CONTENTS .............. 3 Thermal Expansion ............12 INTRODUCTION ................ 4 Strange Sounds ............. 12 Preparing for the New Installation ........

  • Page 4: Introduction

    INTRODUCTION Thank You for purchasing this water heater. Properly installed and 2. The installation must conform with these instructions and the local maintained, it should give you years of trouble free service. code authority having jurisdiction and the requirements of the power company.

  • Page 5: Typical Installation

    TYPICAL INSTALLATION LOWBOYS UPRIGHTS COMPACTS TABLE TOPS INSTALL SUITABLE DRAIN PANS UNDER HEATERS TO PREVENT DAMAGE DUE TO LEAKAGE. REFER TO WATER HEATER LOCATION ON PAGE 8. INSTALL VACUUM RELIEF IN COLD WATER INLET LINE AS REQUIRED BY LOCAL CODES. INSTALL THERMAL EXPANSION TANK OR DEVICE IF WATER HEATER IS INSTALLED IN A CLOSED WATER SYSTEM.

  • Page 6: Wiring Diagrams

    WIRING DIAGRAMS TURN OFF THE HEATER ELECTRICAL SUPPLY BEFORE SERVICING ANY ELECTRICAL COMPONENTS. TWO WIRE CIRCUIT FOR SINGLE 240 VOLT “OFF PEAK” NON-SIMULTANEOUS ELEMENT HEATERS EQUIPPED OPERATION BOTTOM ELEMENT ON SEPARATE WITH HIGH LIMIT CONTROL TIME CLOCK OR “OFF PEAK” METER THREE WIRE CIRCUIT FOR ELECTRIC CO.

  • Page 7: Mixing Valve Usage

    MIXING VALVE USAGE FIGURE 3. Water (Potable) Heating: All models are considered suitable for HOTTER WATER CAN SCALD: water (potable) heating only. Water heaters are intended to produce hot water. Water heated to a temperature which will satisfy space heating, clothes washing, dish washing, and other sanitizing needs can scald and permanently injure you upon contact.

  • Page 8: Locating The New Water Heater

    LOCATING THE NEW WATER HEATER Water heater life depends upon water quality, water pressure and the FACTS TO CONSIDER ABOUT THE LOCATION environment in which the water heater is installed. Water heaters are sometimes installed in locations where leakage may result in property damage, even with the use of a drain pan piped to a drain.

  • Page 9: Temperature-Pressure Relief Valve

    This water heater shall not be connected to any heating systems or TEMPERATURE-PRESSURE RELIEF VALVE component(s) used with a non-potable water heating appliance. Toxic chemicals, such as those used for boiler treatment shall not be introduced into this system. Water supply systems may, because of such events as high line pressure, frequent cut-offs, the effects of water hammer among others, have installed devices such as pressure reducing valves, check valves, back flow preventers, etc.

  • Page 10: Temperature-Pressure Relief Valve

    in front of or around the outlet of the temperature-pressure relief valve discharge line, and (2) the water manually discharged will not cause any bodily injury or property damage because the water may be extremely hot. If after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater, follow the draining instructions, and replace the temperature-pressure relief valve with a new one.

  • Page 11: Temperature Regulation

    TEMPERATURE REGULATION KEEPING THE THERMOSTAT SETTING AT 120°F WILL REDUCE THE Due to the nature of the typical water heater, the water temperature in RISK OF SCALDS. certain situations may vary up to 30°F (16.7 °C) higher or lower at the point of use such as, bathtubs, showers, sink, etc.

  • Page 12: For Your Information

    FOR YOUR INFORMATION THERMAL EXPANSION c. A sulfate reducing bacteria which has accumulated within the water heater (this harmless bacteria is nontoxic to humans). d. An excess of active hydrogen in the tank. This is caused by the corrosion protective action of the anode. Smelly water may be eliminated or reduced in some water heater models by replacing the anode(s) with one of less active material, and then chlorinating the water heater tank and all hot water lines.

  • Page 13: Temperature-Pressure Relief Valve Operation

    anode rod can extend the life of your water heater. Inspection should The water heater should be drained if being shut down during freezing be conducted by a qualified technician, and at a minimum should be temperatures. Also periodic draining and cleaning of sediment from the checked annually after the warranty period.

  • Page 14: Leakage Checkpoints

    LEAKAGE CHECKPOINTS Read this manual first. Then before checking the water heater make sure the electrical power supply has been turned “OFF” before checking the tank for leakage. *A. Condensation and dripping may be seen on pipes if the water temperature is low in humid weather or pipe connections may be leaking.

  • Page 15: Repair Parts List

    REPAIR PARTS LIST Key No. Part Description Upper Heating Element (If Dual Element Unit) Lower Heating Element Element Gasket Lower Thermostat (If Dual Element Unit) Upper Thermostat w/ECO (If Dual Element Unit) Lower Thermostat w/ECO (If Single Element Unit) Outer Door(s) Inlet Tube Drain Valve Drain Valve Washer...

  • Page 16: Troubleshooting

    TROUBLESHOOTING GUIDELINES These guidelines should be utilized by a qualified service agent. Problem Cause Solution Improperly sealed, hot or cold supply connection, Tighten threaded connections. WATER LEAKS relief valve or drain valve. (See Leakage Checkpoints on 14) Inspect other appliances near water heater. Leakage from other appliances or water lines.

  • Page 17: Warranty

    ® Conservationist 10-year 10-year warrantor; PXHT, PXHS • used in an open system or in a closed system with ® ProMax 10-Year Models 10-year 6-year a properly sized and installed thermal expansion tank;...

  • Page 18: Warranty

    Dealer replacements are made subject to in-warranty without invalidating the remainder of the affected provision validation by warrantor. or the other provisions of this warranty. SERVICE AND LABOR RESPONSIBILITY PROOF OF PURCHASE AND PROOF OF INSTALLATION DATE ARE REQUIRED TO SUPPORT WARRANTY CLAIM FROM ORIGINAL OWNER.
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  • Page 20 www.aosmithwaterheaters.com...

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