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A.O. Smith GCVX-50 - User Manual

A.O. Smith GCVX-50
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Instruction Manual
PRINTED IN THE U.S.A 0905 PART NO. 184165-003
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
NOT FOR USE IN MANUFACTURED (MOBILE) HOMES
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.
RESIDENTIAL GAS WRESIDENTIAL GAS W
RESIDENTIAL GAS WRESIDENTIAL GAS W
RESIDENTIAL GAS W
AA
AA
A
TER HEATER HEA
TER HEATER HEA
TER HEA
TERSTERS
TERSTERS
TERS
For Your Safety
AN ODORANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
C3 Technology
®
Gas Water Heaters meet the new
ANSI Z21.10.1 standard that deals with the accidental or
unintended ignition of flammable vapors, such as those
emitted by gasoline.
GAMA certification applies to
all residential gas water
heaters with capacities of 20
to 100 gallons with input rating
of 75,000 BTU/Hr. or less.
®

Questions and Answers

  • A
    Ashley TaylorAug 14, 2025
    What to do if A.O. Smith Water Heater is leaking?
    • A
      Anthony GarciaAug 14, 2025
      If you notice water leaks from your A.O. Smith Water Heater, first, check all threaded connections such as hot or cold supply connections, the relief valve, drain valve, or thermostat threads. Tighten any connections that seem loose. Also, inspect other appliances and water lines near the water heater for any leakage.
  • R
    Roberto McdowellAug 17, 2025
    Why A.O. Smith GCVX-50 burner will not stay lit?
    • V
      vgriffithAug 17, 2025
      If the burner on your A.O. Smith Water Heater won't stay lit, it could be due to several reasons. A defective thermocouple TCO might be the cause, requiring replacement of the pilot assembly. Alternatively, high ambient room temperature or a dirty/clogged air intake screen could be the issue. Try cleaning and reinstalling the air intake screen. If the flame arrestor openings are blocked or the gas control is defective, it's recommended to contact a service agency or replace the gas control, respectively.
  • R
    ronald55Aug 20, 2025
    How to fix A.O. Smith GCVX-50 pilot that will not light?
    • R
      Robert ThomasAug 20, 2025
      If the pilot light of your A.O. Smith Water Heater won't light, ensure the main gas supply is turned on and check that the gas control knob is correctly positioned. Adjust the igniter tip if it's more than 1/8" from the pilot hood. Other potential causes include a thermocouple malfunction, a broken electrode or electrical wire, or a malfunctioning Piezo Ignitor generator. In such cases, replacing the pilot assembly or Piezo Ignitor generator may be necessary. Also, reconnect the wire connector to the spark ignitor if it is disconnected.
  • J
    juliechavezAug 25, 2025
    What to do if A.O. Smith GCVX-50 Water Heater T&P valve is leaking?
    • G
      grant72Aug 25, 2025
      If your A.O. Smith Water Heater's T&P valve is leaking, it might be due to thermal expansion in a closed water system. In this case, install a thermal expansion tank. Also, check the relief valve for proper operation, ensuring it's correctly seated.
  • M
    Maria StaffordAug 27, 2025
    Why does the pilot light keep going out on my A.O. Smith GCVX-50?
    • K
      kimberly39Aug 27, 2025
      If the pilot light on your A.O. Smith Water Heater keeps going out, it might be due to a dirty pilot burner. Try cleaning the pilot assembly. Also, check the air intake screen and clean and reinstall it if it's dirty or clogged. Ensure the thermocouple tip is correctly positioned in contact with the pilot flame. If these steps don't resolve the issue, the thermocouple itself may be malfunctioning and need replacement.
  • E
    Edward TaylorAug 31, 2025
    Why is my A.O. Smith Water Heater not producing enough hot water?
    • B
      Brian FranklinAug 31, 2025
      If your A.O. Smith Water Heater is not providing enough hot water, first check if the heater is lit and the thermostat is on. If not, consult the lighting instructions. If the thermostat is set too low, adjust it according to the temperature regulation guidelines. If the heater is undersized, reduce your hot water usage. Also, consider that unusually cold incoming water will require more time for the heater to reheat, and leaking hot water pipes or fixtures should be checked and repaired by a plumber.
  • W
    whooverSep 3, 2025
    Why is the water from my A.O. Smith Water Heater too hot?
    • C
      catherinehillSep 3, 2025
      If the water from your A.O. Smith Water Heater is too hot, it's likely that the thermostat is set too high. Refer to the temperature regulation guidelines to adjust it to a more comfortable and safe setting.
  • A
    Alexander MaySep 6, 2025
    Why does my A.O. Smith Water Heater have smelly odors?
    • L
      Lee CruzSep 6, 2025
      If you notice smelly odors coming from your A.O. Smith Water Heater, it could be due to high sulfate or mineral content in the water supply. To resolve this, drain and flush the heater thoroughly, then refill it. Another possible cause is bacteria in the water supply, in which case you should chlorinate or aerate the water supply.
  • R
    Raymond HicksSep 10, 2025
    Why A.O. Smith Water Heater is sizzling and rumbling?
    • C
      cathy43Sep 10, 2025
      If your A.O. Smith Water Heater is making sizzling or rumbling sounds, it is likely due to sediment or calcium buildup in the bottom of the tank. To resolve this, clean the sediment from the tank following the draining instructions in the Maintenance section of the manual.

Summary

General Safety and Emergency Procedures

Fire and Explosion Warning

Warning about storing or using gasoline and flammable liquids near the appliance.

Gas Leak Emergency Response

Steps to take if you smell gas: do not light, turn off gas, evacuate, call gas supplier.

Qualified Installation Requirement

Installation and service must be performed by a qualified installer, service agency, or gas supplier.

Safety Alert System and Definitions

Understanding Safety Alert Symbols

Explanation of DANGER, WARNING, and CAUTION symbols and their meanings.

Key Personnel Definitions

Definitions for Qualified Installer, Service Agency, and Gas Supplier roles.

Core Safety Precautions

Fire Hazard Prevention

Precautions against fire, including floor surface and flood damage.

Explosion Hazard Prevention

Measures to prevent tank explosion from overheating or pressure.

Flammable Vapor and Gas Hazards

Avoidance of ignition sources and excessive gas pressure.

Carbon Monoxide Gas Safety

Importance of proper ventilation and using CO detectors.

Introduction and Installation Planning

Manual Overview and Standards

Introduction to the manual, abbreviations, and applicable standards (CSA, ANSI).

Installation Preparation Steps

Key steps before installation: read safety, check codes, and plan location.

Typical Gas Water Heater Installation

Component Identification Guide

Labels and descriptions of various parts of the water heater.

Gas Model Assembly Diagram

Visual representation of the gas water heater components.

Installation Details and Hot Water Safety

Mixing Valve Usage

Diagram and explanation of how to use a mixing valve.

Preventing Scald Injuries

Dangers of hot water and precautions for vulnerable individuals.

Water Heater Location Requirements

Site Selection Factors

Considerations for proximity to venting, piping, and servicing access.

Preventing Leak Damage

Measures to mitigate property damage from water leaks.

Flammable Vapor Area Restrictions

Prohibitions on storing flammable liquids near the appliance.

Clearance Requirements for Fire Safety

Minimum clearances to combustible materials and carpeted floors.

Combustion Air and Ventilation Requirements

Unconfined Space Ventilation

Air supply requirements for appliances in unconfined spaces.

Confined Space Ventilation

Air supply requirements for appliances in confined spaces.

Insulation Blanket Recommendations

Guidance on using insulation blankets and potential risks.

Carbon Monoxide from Air Intake

Warning about obstructing air intake screens and CO risks.

Combustion Air Supply Methods

Confined Spaces: Outdoor Air Supply

Methods for supplying outdoor air via direct openings or ducts.

Duct Sizing and Louver Considerations

Specifications for air duct dimensions and louvers.

Water Piping Installation

Hot Water Temperature Dangers

Risks of scalding from excessively hot water.

Toxic Chemical Hazard Warning

Prohibition of connecting to non-potable or treated water systems.

Thermal Expansion Management

Dealing with pressure increases from heated water expansion.

Temperature-Pressure Relief Valve

T&P Valve Explosion Hazard

Requirements for T&P valves to prevent explosion risks.

Discharge Pipe Safety

Guidelines for safe installation of the T&P discharge pipe.

Manual T&P Valve Operation

Procedure for testing the relief valve and safety precautions.

Filling and Venting Procedures

Water Heater Filling Instructions

Detailed steps to fill the tank before operation.

Venting System Requirements

Ensuring correct vent pipe connection for safe operation.

Carbon Monoxide from Venting

Hazards associated with improper venting and CO production.

Gas Piping Installation

Gas Supply and Pressure Safety

Using correct gas type and maintaining safe pressure levels.

High Altitude Operation

Requirements for gas appliances at elevations above 7,700 feet.

Gas Piping Safety Warnings

Precautions for gas connections, pressure testing, and leak detection.

Gas Piping Connections and Sediment Traps

Gas Piping Connection Methods

Illustrations of flexible and black iron pipe connections.

Sediment Trap Installation

Importance and proper installation of sediment traps in gas lines.

Lighting and Safety Instructions

Pilot Lighting Procedure

Step-by-step instructions for lighting the pilot assembly.

Burner Ignition Procedure

Steps to ignite the main burner after pilot is lit.

Temperature Regulation and Operation

Thermostat Adjustment Guide

How to adjust the temperature dial for desired settings.

Draft Hood Operation Check

Procedure to verify proper draft hood function.

Understanding Condensate

Causes and implications of condensate formation.

Operational Conditions and Hazards

Addressing Smelly Water Issues

Causes of smelly water and potential solutions.

Thermal Expansion Explanation

How thermal expansion affects water system pressure.

High Temperature Shut Off System

Description of the automatic safety shut-off feature.

Periodic Maintenance and Inspection

Venting System Inspection

Checking for obstructions, damage, and soot in the vent system.

Burner Inspection and Cleaning

Visual inspection of burners and guidance on cleaning.

Housekeeping and Air Intake

Maintaining cleanliness around the unit and inspecting air intakes.

Maintenance and Draining Procedures

Anode Rod Inspection and Care

Importance of the anode rod for tank protection.

Water Heater Draining Instructions

Steps required to properly drain the water heater tank.

Drain Valve Washer Replacement

Procedure for replacing a worn drain valve washer.

Leakage Checkpoints and Service

Identifying Water Leak Sources

Guide to common areas where water leaks may occur.

Service Contact Information

Guidance on when and whom to contact for service.

Repair Parts Identification

Component Part Number List

Keyed list of all available repair parts.

Ordering Parts Information

Essential details needed when ordering replacement parts.

Troubleshooting Common Issues

Water Leak Troubleshooting

Diagnosing and fixing issues related to water leaks.

Pilot and Burner Issues

Resolving problems with the pilot not lighting or burner not staying lit.

Hot Water and Sound Issues

Addressing insufficient hot water, too hot water, and unusual noises.

Sooting and Gas Odor Issues

Troubleshooting sooting and vent gas odors.

A.O. Smith GCVX-50 Specifications

General IconGeneral
TypeGas
Capacity50 gallons
Energy Factor0.67
Diameter22 inches
Weight140 lbs
BTU Input40, 000 BTU/hr
Fuel TypeNatural Gas
Vent TypePower Vent
Gas TypeNatural Gas

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