Rheem RTGH-90XLP-2 User Manual

95% CONDENSING
TANKLESS
WATER HEATER
AP18161-1 (11/16)
Do not destroy manual. Please read
carefully and keep in a safe place
for future reference.
CERTIFIED
R
WARNING:
This water heater is not suitable
for use in manufactured (mobile)
homes.
WARNING:
If the information in these
instructions is not followed
exactly, a fire or explosion may
result, causing death, personal
injury, or property damage.
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.
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.
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USE AND CARE MANUAL
With Installation Instructions
for the Installer
Condensing Direct Vent and Outdoor
199,900 Btu/hr, 180,000 Btu/hr and
157,000 Btu/hr Models

Rheem RTGH-90XLP-2 Specifications

General

Brand	Rheem
Model	RTGH-90XLP-2
Category	Water Heater
Language	English

Summary

Important Safety Information

Water Heater Venting Safety

Hazards and precautions related to venting the water heater.

Water Supply Safety

Safety guidelines for water connections, temperature, and quality.

Natural Gas and Liquefied Petroleum Safety

Safety precautions specific to natural gas and LP fuel.

Electrical Safety

Hazards and safety measures for electrical connections and wiring.

USING YOUR WATER HEATER

CARING FOR YOUR WATER HEATER

Preventive Maintenance

Recommendations for routine user and professional maintenance.

Draining the Water Heater

Troubleshooting Chart

Guide to diagnose and solve common water heater problems.

Service Error Code Chart

Explanation of error codes and their solutions.

INSTALLATION INSTRUCTIONS

Standards Compliance

Choosing a Location

Guidelines for selecting a safe and appropriate installation location.

Water Heater Installation

Procedures for installing direct-vent and outdoor water heaters.

Mounting the Water Heater

Venting Requirements

Rules and acceptable materials for installing the venting system.

Horizontal Vent Installation

Procedures and considerations for horizontal vent installations.

Vertical Vent Installation

Procedures and considerations for vertical vent installations.

Water Supply and Connections

Relief Valve Installation

Gas Supply System and Piping

Requirements and procedures for gas supply systems and piping.

Leak and Pressure Testing

Methods for testing gas connections for leaks and system pressure.

Electrical Wiring Requirements

Remote Control Installation

Installation Checklist

Recirculation Control

Activating the Water Heater

Step-by-step guide to start up and activate the water heater.

Setting the Water Temperature

Instructions for setting and adjusting the water temperature.

Minimum Temperature and High-Altitude Adjustments

Maintenance Notice and Error Code Clearing

LIMITED WARRANTY

WARRANTY EXCLUSIONS

HOW TO OBTAIN WARRANTY CLAIM ASSISTANCE