Rheem RTG-3 Series User Manual

With Installation Instructions for the Installer
Noncondensing 199,900 Btu/h, 180,000 Btu/h,
and 160,000 Btu/h Models
Do not destroy manual. Please read carefully and
keep in a safe place for future reference.
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ULTRA
Low NOx
Emissions
SCAQMD Rule 1146.2
WARNING:
If the information in these instructions is not
followed exactly, a fire or explosion may result,
causing death, personal injury, or property dam-
age.
For Your Safety!
• Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or
any other appliance. To do so may result in an
explosion or fire.
• Installation and service must be performed by
a qualified installer, service agency, or the gas
supplier.
D
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D
®
HIGH-EFFICIENCY NON-CONDENSING
TANKLESS WATER HEATER
USE AND CARE MANUAL
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
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the
fire department.
• Do not return to your home until authorized by
the gas supplier or fire department.
AP22009 Rev 04

Rheem RTG-3 Series Specifications

General

Brand	Rheem
Model	RTG-3 Series
Category	Water Heater
Language	English

Summary

Important Safety Information

General Safety Precautions

Defines hazard symbols and lists safety warnings for safe operation.

Venting Safety

Hazards and precautions related to the water heater's venting system.

Water Supply Safety

Hazards and precautions related to water temperature and supply.

Gas Safety

Safety guidelines for natural gas and LP, leaks, and installation.

Operating Safety

Crucial pre-operation checks, activation, and shutdown procedures.

Electrical Safety

Hazards and precautions for electrical connections, wiring, and grounding.

Installation and Maintenance Safety

Compliance with codes, proper installation, and maintenance practices.

Product Information

For Your Records

Section to record model, serial number, and installation details for reference.

Specifications and Dimensions

Technical specifications and physical dimensions for different models.

Performance Curves

Graphics illustrating water heater flow rates and pressure drop characteristics.

Component Descriptions

Diagrams and descriptions of typical direct-vent and outdoor unit components.

Installation Instructions

General Installation Requirements

Standards compliance, choosing a location, and product inspection.

Water Heater Mounting and Connections

Mounting steps, water/gas/electrical connections, and relief valve installation.

Venting System Installation

Requirements, lengths, terminal locations, and adjustments for venting.

Gas Supply Installation

Guidelines for gas system sizing, installation, and leak testing.

Electrical Wiring and Controls

Safety, codes, requirements, diagrams, and remote control installation.

Installation Precautions and Checklist

Final checks, precautions, and a checklist for successful installation.

Using Your Water Heater

Activating and Operating the Water Heater

Step-by-step instructions for turning on, operating, and shutting off the heater.

Setting the Water Temperature

Hazards of high temperatures and how to adjust settings via display or remote.

Advanced Features

Instructions for WiFi setup, recirculation pump control, and water saving control.

Caring For Your Water Heater

Water Heater Inspections

Annual checks for venting, burner, condensate trap, and air intake.

Care and Cleaning Procedures

General cleaning, water filter maintenance, and air intake clearance.

Preventive Maintenance

User-suggested tasks and recommendations for professional periodic inspection.

Draining and Freeze Protection

Step-by-step draining instructions and measures to prevent freezing.

Troubleshooting and Error Codes

Charts to diagnose problems and interpret service error codes.

Maintenance Notice

Explanation of the maintenance reminder and how to clear error code 88.

If You Need Service

Parts Ordering

Guidelines and diagrams for ordering replacement parts.

Warranty Information

Details of the limited warranty, coverage periods, exclusions, and claim assistance.