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GSW 6G40NAV - User Manual

GSW 6G40NAV
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RESIDENTIAL GAS WATER HEATERS
Installation and Operating Manual
1410 328765-000
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
POWER DIRECT VENT GAS MODELS
WITH HOT SURFACE IGNITION
NOT FOR USE IN MANUFACTURED (MOBILE) HOMES
For Your Safety
AN ODOURANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS
PURCHASED. IF YOU ARE UNSUCCESSFUL, PLEASE CONTACT THE COMPANY LISTED ON THE RATING PLATE ON THE WATER HEATER.

Table of Contents

Questions and Answers

  • P
    peter13Nov 24, 2025
    What should I do if my GSW 6G40NAV has a Soft Lockout - Recycle Limit - Pressure Switch/ High Limit opened?
    • C
      camachochristopherNov 24, 2025
      If your GSW Water Heater displays a Soft Lockout - Recycle Limit - Pressure Switch/ High Limit opened, try these steps: 1. Ensure the blower is running by checking for 120 VAC to the blower when the heating cycle starts. If the Gas Control doesn't energize the blower, replace it. If the blower doesn't start when energized: * Turn the power off and check if the capacitor is connected. * Turn the power off and check the capacitor rating (3uF +/-5%). * Turn the power off and replace the blower assembly. 2. Make sure the air pressure sensing tubes are properly connected and not kinked or damaged. 3. Check the continuity of the vent temperature limit switch, and replace the switch if contacts remain open. 4. Check the continuity of the air pressure switch (N.C.), and repl...
  • T
    Todd FrederickDec 3, 2025
    What to do if my GSW 6G40NAV has a Pressure Switch Failed Open?

    Summary

    SAFE INSTALLATION, USE AND SERVICE

    IMPORTANT DEFINITIONS

    Provides definitions for key terms like Qualified Installer, Service Agency, and Gas Supplier.

    GENERAL SAFETY

    Fire Hazard

    Warnings about fire risks, including operating a flood-damaged heater.

    Explosion Hazard

    Warnings about explosion risks from overheated water and relief valve issues.

    Fire or Explosion Hazard

    Warnings about storing flammable liquids and ignition sources.

    GENERAL SAFETY

    CAUTION: Property Damage Hazard

    Cautions about improper installation and property damage.

    Breathing Hazard - Carbon Monoxide Gas

    Warnings about carbon monoxide hazards and proper venting.

    DANGER: Flammable Vapours

    Dangers associated with flammable vapors and ignition sources near the heater.

    INTRODUCTION

    QUALIFIED INSTALLER OR SERVICE AGENCY

    Defines requirements for installers and service personnel for safe operation.

    PREPARING FOR THE INSTALLATION

    Instructions on reading the manual, safety rules, and planning installation.

    TYPICAL INSTALLATION

    GET TO KNOW YOUR WATER HEATER - GAS MODELS (LIST REFERENCING FIGURES 1-5)

    Identifies and lists key components of the water heater using figures.

    TYPICAL INSTALLATION

    REPLACEMENT PARTS AND DELIMING PRODUCTS

    Information on ordering replacement parts and recommended delimer.

    COMBO HEATING INLET AND OUTLET SIDE TAPS

    Details on using side taps for combo heating applications.

    WATER PIPING - MIXING VALVE USAGE

    Mixing Valves

    Discusses the use of mixing valves to prevent scalds from hot water.

    WATER HEATER OPERATION

    WATER HEATER OPERATION

    Explains the sequence of operation when a call for heat is initiated.

    ELECTRICAL REQUIREMENTS & WIRING DIAGRAM

    ELECTRICAL REQUIREMENTS & WIRING DIAGRAM

    Details electrical specifications, safety precautions, and wiring diagrams.

    SAFETY LOCKOUTS

    HIGH LIMIT CONTROLS (ENERGY CUT OFF)

    Explains the thermostat and high limit controls as safety features.

    Blower High Limit Switch

    Describes the blower high limit switch and its function.

    BLOWER AIR PRESSURE SWITCHES

    Details the function of air pressure switches for blower safety.

    LOCATING THE NEW WATER HEATER

    FACTS TO CONSIDER ABOUT THE LOCATION

    Key considerations for selecting the installation location for safety and economy.

    LOCATING THE NEW WATER HEATER

    Clearances To Combustibles

    Specifies minimum clearances from combustible materials for safe installation.

    Floors With Carpeting

    Instructions for installing the water heater on carpeted floors to prevent fire hazards.

    Clearances For Servicing

    Importance of location for accessibility during servicing and part replacement.

    HIGH AMBIENT TEMPERATURE INSTALLATIONS

    Guidelines for installations in areas with high ambient temperatures.

    LOCATING THE NEW WATER HEATER

    AIR REQUIREMENTS

    Discusses the need for adequate fresh air for combustion, dilution, and ventilation.

    INSTALLING THE NEW WATER HEATER

    WATER PIPING

    Details on water piping, including scald hazards and pressure limits.

    SPACE HEATING AND POTABLE WATER SYSTEMS

    Information on suitability for combination water and space heating systems.

    INSTALLING THE NEW WATER HEATER

    COMBO HEATING

    Guide for installing and using "Combo" heating systems with domestic water heaters.

    INSTALLING THE NEW WATER HEATER

    CLOSED WATER SYSTEMS

    Explains closed water systems and devices that cause them.

    THERMAL EXPANSION

    Discusses thermal expansion in closed systems and its effects.

    TEMPERATURE-PRESSURE RELIEF VALVE

    TEMPERATURE-PRESSURE RELIEF VALVE

    Explains the T&P valve, its certification, and installation requirements.

    TEMPERATURE-PRESSURE RELIEF VALVE

    Temperature-Pressure Relief Valve And Pipe Insulation

    Instructions for installing insulation on the T&P valve and associated piping.

    HIGH ALTITUDE INSTALLATION

    Specific requirements for operating the heater at high altitudes.

    GAS PIPING

    Warnings and guidelines for gas piping installation.

    GAS PIPING

    SEDIMENT TRAPS

    Importance and installation of sediment traps in gas lines to prevent fires.

    FILLING THE WATER HEATER

    FILLING THE WATER HEATER

    Step-by-step instructions for filling the water heater tank with water.

    VENTING

    VENTING

    General information and warnings about the venting system.

    VENTING

    TERMINATION CLEARANCES (SIDEWALL)

    Specifies clearances for sidewall vent termination locations.

    VENTING

    Side Wall Vent Terminal Installation

    Guidelines for installing the vent terminal on a side wall.

    Roof Vent Terminal Installation

    Instructions for installing the vent terminal through a roof.

    Concentric Vent Termination Kit Installation

    Information on installing a concentric vent termination kit.

    VENTING

    Multiple Concentric Vent Installations

    Spacing requirements for multiple concentric vent installations.

    Vent Pipe Length

    Details maximum allowable pipe lengths for intake and exhaust systems.

    VENTING

    Vent Pipe Termination

    Information on vent termination screens and their installation.

    VENTING

    Venting Terminations And Sizing

    Referencing tables for vent pipe sizing and termination.

    Vent Screen Installation

    Instructions for installing vent screens to prevent foreign objects from entering.

    VENTING

    Vent Pipe Material

    Approved materials for vent pipes and joining procedures.

    Vent Pipe Installation

    Guidelines for installing air intake and exhaust vent systems.

    VENTING

    Vent Pipe Runs

    Guidelines for routing vent pipes, including slope and support.

    Vent Terminal Installations

    Requirements for vent terminal placement and clearances.

    BLOWER ASSEMBLY INSTALLATION

    Steps for installing the blower assembly, including electrical connections.

    VENTING

    Vent;Intake Pipe Connections To Blower;Air Duct

    How to connect vent and intake pipes to the blower assembly.

    VENTING

    Coupling Installations According To Vent Sizes

    Illustrates coupling installations based on different vent pipe sizes.

    VENTING

    SOUND SUPPRESSOR

    Information on the sound suppressor and its installation.

    Side Wall Vent Installation

    Preferred location and use of the sound suppressor for sidewall vents.

    Vertical Vent Installation

    Use of the sound suppressor for vertical vent terminations.

    INSTALLATION CHECKLIST

    INSTALLATION CHECKLIST

    A checklist to ensure all installation steps are completed before lighting the heater.

    LIGHTING INSTRUCTIONS

    LIGHTING INSTRUCTIONS

    Step-by-step guide for safely lighting the water heater.

    OPERATING THE TEMPERATURE CONTROL SYSTEM

    OPERATING THE TEMPERATURE CONTROL SYSTEM

    How to set and adjust the water temperature for safety and efficiency.

    OPERATING THE TEMPERATURE CONTROL SYSTEM

    GAS CONTROL VALVE;THERMOSTAT

    Details the gas control valve and thermostat settings.

    FOR YOUR INFORMATION

    START UP CONDITIONS

    Information on condensation, smoke, odor, and strange sounds during startup.

    OPERATIONAL CONDITIONS

    Discusses smelly water, air in faucets, and hydrogen gas hazards.

    PERIODIC MAINTENANCE

    GENERAL UPKEEP

    Routine checks and cleaning for the heater and its surroundings.

    VENTING SYSTEM INSPECTION

    How to inspect the venting system for obstructions or damage.

    BURNER OPERATION AND INSPECTION

    Annual inspection of the main burner and hot surface igniter for proper operation.

    PERIODIC MAINTENANCE

    COMBUSTION CHAMBER AND BURNER CLEANING

    Procedure for cleaning the combustion chamber and burner openings.

    HOUSEKEEPING

    Precautions regarding chemical vapors and flammable products near the heater.

    TEMPERATURE-PRESSURE RELIEF VALVE TEST

    How to test the temperature-pressure relief valve annually.

    PERIODIC MAINTENANCE

    DRAINING AND FLUSHING

    Steps for draining and flushing the water heater tank to remove sediment.

    PERIODIC MAINTENANCE

    ANODE ROD MAINTENANCE

    Information on inspecting and replacing the anode rod to prevent corrosion.

    LEAKAGE CHECKPOINTS

    SERVICE

    Guide to identify and correct water leaks from various sources.

    REFERENCE PARTS LISTING

    REFERENCE PARTS LISTING

    Lists replacement parts with item numbers and descriptions, referencing figures.

    REFERENCE PARTS LISTING

    Notes

    Clarifies notes related to parts and installation, including thread types.

    TROUBLESHOOTING GUIDELINES

    LOCKOUTS

    Explains soft and hard lockouts and their causes.

    RESETTING THE HEATER CONTROL

    Procedure for resetting the heater control after a lockout.

    IGNITION STATE AND TIMING

    Table detailing ignition states and their corresponding timing sequences.

    TROUBLESHOOTING GUIDELINES

    SYSTEM STATUS AND ERROR CODES

    Lists system status codes (LED flash sequences) and their meanings.

    READING THE LED FLASH SEQUENCE

    How to interpret LED flash sequences to diagnose errors.

    TROUBLESHOOTING GUIDELINES

    CORRECTIVE ACTIONS

    Provides corrective actions for system status and error codes.

    TROUBLESHOOTING GUIDELINES

    CORRECTIVE ACTION

    Continues corrective actions for various error codes and system issues.

    OTHER SYMPTOMS

    OTHER SYMPTOMS

    Lists common problems, their possible causes, and corrective actions.

    GSW 6G40NAV Specifications

    General IconGeneral
    TypeElectric Storage Water Heater
    Power SourceElectric
    Water Pressure150 PSI
    Protection LevelIPX4
    Heating Capacity40, 000 BTU/hour

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