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A.O. Smith GPS-75 - User Manual

A.O. Smith GPS-75
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1
Thank you for buying this energy efficient water heater. We
appreciate your condence in our products.
You should thoroughly read this manual before installation and/or
operation of this water heater. Please pay particular attention
to the important safety and operating instructions as well as the
WARNINGS and CAUTIONS.
Instruction Manual
PRINTED IN THE U.S.A 0209 197209-002
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
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 WATER HEATERS
• For Your Safety •
AN ODORANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
GAS MODELS POWER VENT GPS-75
WITH HOT SURFACE IGNITION
500 Tennessee Waltz Parkway
Ashland City, TN 37015

Table of Contents

Other manuals for A.O. Smith GPS-75

Preview: Owner's Manual
Owner's Manual20 pages

Questions and Answers

  • S
    Stacey GarciaSep 13, 2025
    What does it mean if my A.O. Smith GPS-75 has gas valve driver circuit problem?
    • M
      Melissa ArcherSep 13, 2025
      If the self-diagnostic tests on your A.O. Smith Water Heater indicate an issue with the gas valve driver circuit, internal microprocessor, or other internal circuits, try these steps: 1. Turn the power off for 10-20 seconds, then turn it back on to clear the error codes. 2. If any of these error codes persist or cannot be cleared, replace the Intelli-Vent™ control.
  • L
    lewislisaSep 15, 2025
    What to do if A.O. Smith Water Heater temperature sensor is open or shorted?
    • S
      Sierra McdonaldSep 15, 2025
      If the self-diagnostic check on your A.O. Smith Water Heater detects that the water temperature sensor (thermistor) is either open or shorted: 1. Turn the power off for 10-20 seconds, then turn it back on to clear the error code. 2. If the error code persists, replace the Intelli-Vent™ control.
  • A
    Audrey FloresSep 18, 2025
    What does it mean if A.O. Smith GPS-75 Water Heater flame signal is out of sequence?
    • G
      Gerald AndersonSep 18, 2025
      If your A.O. Smith Water Heater senses a flame signal out of proper sequence: 1. Turn the power off for 10-20 seconds, and then turn it on again to clear this error code. 2. If this error code persists, replace the Intelli-Vent™ control.
  • A
    Andrea SmithNov 19, 2025
    How to fix A.O. Smith Water Heater with not enough hot water?
    • V
      Victoria BensonNov 19, 2025
      If you're not getting enough hot water from your A.O. Smith Water Heater, here are a few things to check: * Make sure the “ON/OFF” control switch is in the “ON” position. * Ensure the blower is plugged into a functioning 115 vac outlet. * Verify there is power at the outlet. If not, have the outlet serviced. * Check the switch, control harness, and blower motor for any defects, and replace them if necessary. * If the blower is running but the burner isn't on, the switch may need replacement. * Confirm that the dilution air openings are free of obstructions. * Ensure that there is no more than 30 equivalent feet of 3 inch pipe or 85 equivalent feet of 4 inch pipe. * Make sure the vent terminal is not blocked. * Check for low voltage (less than 102 vac.) and have service c...
  • K
    Kiara KentNov 24, 2025
    What to do if my A.O. Smith GPS-75 Water Heater has ignition failure?
    • B
      Brian MillerNov 25, 2025
      If your A.O. Smith Water Heater experiences ignition or flame failure and locks out after retries, check the following: * Ensure the gas supply is on and the pressure meets the requirements specified in the installation manual. Note that the manifold gas pressure is non-adjustable; if it's off by more than 0.3” W.C. (75 Pa), the Intelli-Vent™ control should be replaced. * Verify the supply voltage is between 115-125 VAC. * Confirm the flame sensor makes good contact with the burner flame and the flame is steady. * Clean the flame sensor using ultra-fine steel wool or a Scotch-Brite™ pad. * Ensure the hot surface ignitor is correctly positioned for consistent ignition. * Inspect the ignitor assembly for cracks in the ceramic insulators; replace if damaged. * Check the ignitor...

Summary

General Safety and Emergency Procedures

Gas Leak Detection and Response Protocols

Detailed steps for identifying and responding to gas leaks.

Essential Safety Warnings and Manual Retention

Key safety alerts and instructions for keeping the manual.

Safe Installation, Use, and Service Overview

Understanding Safety Symbols and Key Definitions

Explanation of DANGER, WARNING, CAUTION symbols and important roles.

General Safety Precautions

Fire, Explosion, and Scald Hazard Warnings

Critical warnings regarding fire, explosion, and scalding risks.

Additional Safety Guidelines

Flammable Vapors and Carbon Monoxide Hazards

Risks associated with flammable liquids and CO gas.

Introduction and Installation Preparation

Preparing for Water Heater Installation

Key steps and considerations before installing the water heater.

Specific Installation Requirements (Massachusetts)

Carbon Monoxide Detectors and Signage Rules

State-specific mandates for CO detectors and warning signs.

Typical Water Heater Installation Overview

Component Identification and Control Panel

Diagrams of water heater parts and thermostat controls.

Water Piping and Mixing Valve Usage

Scald Prevention with Mixing Valves

Using mixing valves to prevent hot water scalds.

Locating the New Water Heater

Location Considerations and Drainage Requirements

Guidelines for selecting a safe and accessible installation location.

Flammable Material Risks in Installation Areas

Safety precautions for areas with flammable liquids or vapors.

Combustion Air and Ventilation Requirements

Clearances, Insulation, and CO Hazards

Safety rules for vent clearances, insulation blankets, and CO risks.

Ventilation for Confined and Unconfined Spaces

Requirements for air supply based on installation space type.

Ventilation Air Intake Methods

Indoor and Outdoor Air Supply Options

Methods and diagrams for providing ventilation air.

New Water Heater Installation: Chemical and Water Piping

Chemical Vapor Corrosion Risks and Water Piping

Impact of chemicals on vent systems and water pipe connections.

Thermal Expansion and Toxic Chemical Hazards

Risks of pressure buildup and contamination from chemicals.

Temperature-Pressure Relief Valve and Piping

T&P Valve Requirements and Explosion Hazards

Safety and installation rules for the relief valve.

Discharge Pipe Safety and Water Damage Prevention

Guidelines for the relief valve discharge pipe to prevent damage.

Gas Piping and High Altitude Adjustments

Gas Piping Safety and Leak Testing

Procedures for safe gas line installation and leak checks.

High Altitude Orifice and CO Warnings

Adjustments for high altitude and carbon monoxide risks.

Sediment Traps, Filling, and Venting Basics

Sediment Trap Installation and Gas Safety

Importance of sediment traps to prevent gas system contamination.

Filling the Water Heater and Venting Overview

Procedure for filling the tank and general vent system setup.

Vent System Clearances and Planning

U.S. Horizontal Vent Clearances

Diagrams showing minimum distances for horizontal vent terminals.

Vent System Planning and Pipe Sizing

Guidance on designing the vent route and selecting pipe size.

Vent Pipe Materials and Condensate Management

Approved Vent Pipe Materials and Installation

Specifications for PVC, CPVC, and ABS vent pipes.

Condensate Handling and Blower Assembly Checks

Managing vent system condensation and blower connections.

Sidewall Vent Terminal Installation

Vent Terminal Installation Procedure and Diagrams

Step-by-step guide for installing the vent terminal through a wall.

Power Vent Wiring Schematic and Safety

Wiring Diagrams and Electrical Safety Precautions

Electrical connection diagrams and essential safety measures.

Vent System Installation Completion

Sidewall and Vertical Vent System Installation

Final steps for installing sidewall or vertical vent systems.

Vent Termination Clearances and Requirements

Critical distances for vent outlets to ensure safety.

Vent Pipe Preparation and Materials

Initial Preparation and Material Selection

Steps for preparing PVC/CPVC pipes and selecting materials.

Primer and Cement Application Guidelines

Safe and correct application of primer and solvent cement.

Vent Pipe Joint Assembly and Cleanup

Pipe Deburring, Dry Fitting, and Cement Application

Preparing pipe ends and applying cement for strong joints.

Joint Assembly and Cleanup Procedures

Steps for assembling pipes and cleaning excess cement.

Operating Instructions and Safety Checks

Pre-Operation Safety Checks and Gas Leak Procedures

Essential checks before operation and actions for gas detection.

Water Heater Operation and Temperature Setting

Step-by-step guide for starting and adjusting the water heater.

Temperature Regulation and Scald Prevention

Adjusting Water Temperature and Scald Hazard Risks

How to set temperature and minimize scald risks.

Temperature Indicators and Adjustment Controls

Understanding the water heater's temperature display and buttons.

Important Operational Information

Startup Conditions: Smoke, Odor, Thermal Expansion, Sounds

Notes on initial operation, including smoke, odor, and noises.

Operational Problems: Smelly Water and Hydrogen Gas

Troubleshooting common issues like smelly water and hydrogen gas.

Periodic Maintenance and Housekeeping

Venting System and Burner Inspection

Procedures for inspecting the vent system and burner assembly.

Burner Cleaning and General Unit Upkeep

Steps for cleaning the burner and maintaining the unit's exterior.

Anode Rod, Relief Valve, and Draining Procedures

Anode Rod Inspection and Replacement

Maintenance of the anode rod for tank protection.

Relief Valve Operation and Tank Draining

Testing the relief valve and emptying the water heater tank.

Water Heater Service and Leakage Checks

Service Guidelines and Identifying Water Leaks

General service advice and methods for detecting water leaks.

Repair Parts List and Ordering

Component Identification for Parts Ordering

A diagram and list of water heater components for ordering parts.

Troubleshooting with Intelli-Vent Control System

Intelli-Vent LED Status Codes and Troubleshooting

Diagnosing issues using LED status codes on the control system.

Intelli-Vent Control Troubleshooting (Continued)

Intelli-Vent Error Codes and Resolution Steps

Further troubleshooting for the Intelli-Vent control system error codes.

General Troubleshooting Guide

Common Water Heater Problems and Solutions

A comprehensive list of common issues and their solutions.

Limited Residential Gas Warranty

Warranty Terms, Conditions, and Responsibilities

Details on warranty coverage, exclusions, and owner obligations.

Claim Process and Important Information

Steps for filing a warranty claim and required documentation.

A.O. Smith GPS-75 Specifications

General IconGeneral
BrandA.O. Smith
ModelGPS-75
CategoryWater Heater
LanguageEnglish

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