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A.O. Smith GPS-75 User Manual

A.O. Smith GPS-75
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5
Thank You for purchasing this water heater. Properly installed and
maintained, it should give you years of trouble free service.
Abbreviations Found In This Instruction Manual:
ANSI - American National Standards Institute
NFPA - National Fire Protection Association
ASME - American Society of Mechanical Engineers
GAMA - Gas Appliance Manufacturer’s Association
UL - Underwriters Laboratories Inc.
This gas-red water heater is design certied by Underwriters
Laboratories Inc. under American National Standard for Gas Water
Heaters ANSI Z21.10.3 (current edition).
PREPARING FOR THE INSTALLATION
1. Read the “General Safety” section, page 3 and 4 of this manual rst
and then the entire manual carefully. If you don’t follow the safety
rules, the water heater will not operate properly. It could cause
DEATH, SERIOUS BODILY INJURY AND/OR PROPERTY DAMAGE.
This manual contains instructions for the installation, operation, and
maintenance of the gas-red water heater. It also contains warnings
throughout the manual that you must read and be aware of. All warnings
and all instructions are essential to the proper operation of the water
heater and your safety. Since we cannot put everything on the rst
few pages, READ THE ENTIRE MANUAL BEFORE ATTEMPTING
TO INSTALL OR OPERATE THE WATER HEATER.
2. The installation must conform with these instructions and the local
code authority having jurisdiction. In the absence of local codes,
installations should comply with the National Fuel Gas Code (ANSI
Z223.1/NFPA 54) and the National Electrical Code (NFPA 70).
These publications are available from The National Fire Protection
Association, 1 Batterymarch Park, Quincy, MA 02269.
3. The water heater when installed must be grounded in accordance
with the local codes, or in the absence of local codes: the National
Electrical Code (NFPA 70).
4. If after reading this manual you have any questions or do not
understand any portion of the instructions, call the local gas utility
or the manufacturer whose name appears on the rating plate.
5. Carefully plan the place where you are going to put the water
heater. Correct combustion, vent action, and vent pipe installation
are very important in preventing death from possible carbon
monoxide poisoning and res, see Figures 1 and 2.
Examine the location to ensure the water heater complies with
the “Locating the New Water Heater” section in this manual.
6. For California installation this water heater must be braced,
anchored, or strapped to avoid falling or moving during an
earthquake. See instructions for correct installation procedures.
Instructions may be obtained from California Ofce of the State
Architect, 400 P Street, Sacramento, CA 95814.
7. Massachusetts Code requires this water heater to be installed in
accordance with Massachusetts 248-CMR 2.00: State Plumbing
Code and 248-CMR 5.00. For more information see next page.
8. Complies with SCAQMD rule #1146 and districts having equivalent
NOx requirements.
INTRODUCTION
TABLE OF CONTENTS
SAFE INSTALLATION, USE AND SERVICE.................................. 2
GENERAL SAFETY.....................................................................3-4
TABLE OF CONTENTS .................................................................. 5
INTRODUCTION ............................................................................ 5
Preparing for the Installation ................................................... 5
INSTALLATION REQUIREMENTS FOR THE
COMMONWEALTH OF MASSACHUSETTS ................................. 6
TYPICAL INSTALLATION ............................................................ 7-8
LOCATING THE NEW WATER HEATER .................................. 9-11
Facts to Consider About Location ...................................... 9-10
Insulation Blankets ................................................................ 10
Combustion Air and Ventilation for Appliances
Located in Unconned Spaces ............................................. 10
Combustion Air and Ventilation for Appliances
Located in Conned Spaces ............................................ 10-11
INSTALLING THE WATER HEATER ....................................... 12-22
Chemical Vapor Corrosion .................................................... 12
Water Piping ....................................................................12-13
Temperature-Pressure Relief Valve ...................................... 13
Gas Piping ............................................................................ 14
Sediment Traps ..................................................................... 15
Filling the Water Heater ........................................................ 15
Venting .................................................................................. 15
Vent Pipe Termination ...................................................... 15-16
Planning the Vent System ................................................ 16-17
Condensate........................................................................... 17
Blower Assembly Installation ........................................... 17-18
Installation of Vent System...............................................18-21
Vent Pipe Preparation ......................................................21-22
LIGHTING & OPERATING LABEL ...............................................23
TEMPERATURE REGULATION .................................................. 24
FOR YOUR INFORMATION ......................................................... 25
Start Up Conditions
Smoke/Odor ..................................................................25
Thermal Expansion ....................................................... 25
Strange Sounds ............................................................25
Operational Conditions ......................................................... 25
Smelly Water ................................................................. 25
“Air” in Hot Water Faucets ............................................. 25
High Temperature Shut Off System ............................... 25
PERIODIC MAINTENANCE ....................................................26-28
Venting System Inspection.................................................... 26
Burner Operation and Inspection .......................................... 26
Burner Cleaning .................................................................... 26
Housekeeping ..................................................................26-27
Anode Rod Inspection...........................................................27
Temperature-Pressure Relief Valve Operation .....................27
Draining.................................................................................27
Service .................................................................................. 28
LEAKAGE CHECKPOINTS .......................................................... 28
REPAIR PARTS ............................................................................ 29
TROUBLESHOOTING ............................................................30-32
WARRANTY ................................................................................. 35

Table of Contents

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Questions and Answers:

A.O. Smith GPS-75 Specifications

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

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.

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