Rheem GHE 125-500A User Manual

Printed in USA
FOR YOUR SAFETY!
— Do not store or use gasoline or other flammable
vapors or liquids or other combustible materials in
the vicinity of this or any other appliance. To do so
may result in an explosion or fire.
— WHAT TO DO IF YOU SMELL GAS
•
Do not try to light any appliance.
•
Do not touch any electrical switch; do not use any
phone in your building.
•
Immediately call your gas supplier from a neigh-
bor's phone. Follow the gas supplier's instructions.
•
If you cannot reach your gas supplier, call the fire
department.
•
Do not return to your building until authorized by
the gas supplier or fire department.
— Improper installation, adjustment, alteration, service
or maintenance can cause injury, property dam-
age or death. Refer to this manual. Installation and
service must be performed by a qualified installer,
service agency or the gas supplier.
WARNING: If the information in these instructions are not followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
NOTICE: This water heater is designed for use in a commercial application and the installation and maintenance of it should be per-
formed by a qualified, licensed service personnel. If the foregoing assumption is not appropriate, then we recommend that you obtain
and retain our Commercial Use & Care Manual.
!
!
!
AP16883 (10/13)
WITH INSTALLATION INSTRUCTIONS FOR THE CONTRACTOR
Commercial High Efficiency Water Heater
USE & CARE MANUAL
CALIFORNIA PROPOSITION 65 WARNING: This product contains chemicals known to the State of California to cause cancer, birth
defects or other reproductive harm.
!
Do Not Destroy this Manual. Please read carefully and
keep in a safe place for Future Reference.
Recognize this symbol as an Indication of Important
Safety Information!
!
!
GAS-FIRED

Rheem GHE 125-500A Specifications

General

Model Number	GHE 125-500A
Fuel Type	Natural Gas
Type	Gas
Input	500, 000 BTU/hr
Warranty	3 years on tank, 1 year on parts

Summary

General Safety and Warnings

Important Safety Information Symbol

Symbol indicating critical safety information within the manual.

What to Do If You Smell Gas

Emergency procedures to follow if a gas leak is detected.

Safety Information and Symbols

Safety Alert Symbol Explanation

Explanation of the safety alert symbol and its meaning.

Hazard Definitions (DANGER, WARNING, CAUTION)

Defines hazard levels: DANGER, WARNING, and CAUTION.

General Safety Precautions: Water Temperature

Scald Hazard from Hot Water

Details the risk of severe burns from water temperatures over 125°F.

Temperature and Scald Time Relationship

General Safety Precautions: Flammables and LP Gas

Flammable Liquids and Vapors

Warnings against storing or using flammable materials near the water heater.

LP Gas Safety Precautions

Specific safety guidelines for Liquefied Petroleum (LP) gas.

Installation: Water, Relief Valve, and Gas Supply

Water Connections and Thermal Expansion

Relief Valve Requirements

Details on the pressure/temperature relief valve and its discharge line.

Gas Supply Requirements

Guidelines for gas supply lines, pressure, and connections.

Installation: Venting and Clearances

Venting System Requirements

Instructions for venting the water heater outdoors, including materials.

Minimum Installation Clearances

Installation: Venting Connections and Materials

Vent Pipe Connection Procedure

How to connect vent pipes, including material specifications.

Joining Pipes and Fittings

Installation: Venting Procedures and Sizing

Direct Vent Installation Considerations

Vent Pipe Sizing and Lengths

Guidance on pipe sizing and maximum/minimum lengths for venting.

Installation: Electrical Wiring and Grounding

Power Supply Requirements

Specifications for the 120V power supply and disconnect means.

Electrical Grounding and Polarity

Instructions on proper electrical grounding and polarity checks.

Installation Check List

Water Heater Location Checks

Water Supply Checks

Gas Supply Checks

Relief Valve and Venting Checks

Operation: Safety and Temperature

General Operating Safety Precautions

Critical safety warnings before operating the appliance.

Temperature Setting Guidelines

Emergency Shutdown Procedure

Instructions for safely shutting down the appliance in an emergency.

Operation: Sequence and Performance Monitoring

Super Duty Sequence of Operation

Operation: Adjusting Water Temperature

Steps to Adjust Setpoint Temperature

Operation: Startup and Shutdown

Pre-Operation Safety Checks

Essential safety checks before turning on the appliance.

Operating Instructions Overview

Turning Off Gas to Appliance

Maintenance: Routine and Tank Cleaning

Routine Preventive Maintenance Schedule

Tank Cleaning Procedure

Troubleshooting: General Issues

General Troubleshooting Guide

Table of common problems, possible causes, and recommended actions.

Troubleshooting: Lockout Errors

Lockout Error Code Definitions

List of lockout error codes, their descriptions, and causes/actions.

Troubleshooting: Blocking Errors

Blocking Error Code Definitions

List of blocking error codes, their descriptions, and causes/actions.

Troubleshooting: Installer Menu

Using the Installer Menu for Diagnostics

Troubleshooting: Flame Sensor and Ignitor Service

Servicing Flame Rod and Ignitor

Instructions for checking and servicing the flame rod and hot surface ignitor.