Rheem RTGH Series - User Manual

Do not destroy this manual. Please read carefully
and keep in a safe place for future reference.
CERTIFIED
R
Print 2D
Bar Code
Here
www.ahridirectory.org
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
E
S
I
G
N
C
E
R
T
I
F
I
E
D
®
SUPER HIGH EFFICIENCY 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.
With Installation Instructions
for the Installer
Condensing Direct Vent
199,900 Btu/hr, 180,000 Btu/hr,
157,000 Btu/hr and 120,000 Btu/hr Models
AP21820 Rev 03

Summary

Important Safety Information

Understanding Safety Symbols and Terms

Explains safety alert symbols and the meaning of DANGER, WARNING, CAUTION, NOTICE.

General Installation and Operation Safety

Key warnings for safe installation, adjustment, alteration, service, and maintenance.

Water Heater Venting Safety

Water Heater Venting Safety

Hazards of improper venting, including fire, explosion, and carbon monoxide risks.

Water Supply Safety

Water Supply Safety

Warnings regarding water temperature settings, scald potential, and water connections.

Natural Gas and Liquefied Petroleum Safety

Natural Gas and Liquefied Petroleum Safety

Safety precautions for handling and using natural gas and LP gas appliances.

Pre-Operation Safety Checks

Pre-Operation Safety Checks

Essential safety steps and warnings before attempting to operate the appliance.

Operating Instructions

Step-by-step guide to safely start and operate the water heater.

Electrical Safety and California Requirements

Electrical Safety

Warnings and precautions for safe electrical connections and grounding.

California Installation Requirements

Specific bracing requirements for water heaters in California due to earthquake risks.

General Installation and Product Information

General Installation and Maintenance Safety

Overall safety guidelines for installation, maintenance, and disassembly.

For Your Records

Section to record important product details like model and serial numbers.

Preoperating Checklist

A checklist of items to verify before operating the water heater for the first time.

Product Specifications

Specifications - Direct-Vent Models

Physical dimensions and views of the direct-vent water heater models.

Rating Label Information

Explanation of the product information found on the English and French rating labels.

Performance Curves

Graphical representation of pressure drop and temperature rise versus water flow rate.

General Descriptions - Indoor Model

Diagram illustrating the typical components and connections of an indoor direct-vent water heater.

General Descriptions - Outdoor Model

Diagram illustrating the typical components and connections of an outdoor water heater.

Installation Instructions

For the Contractor

Indicates the section is intended for installation contractors.

Standards Compliance and Location Selection

Compliance with codes and guidelines for choosing a proper installation location.

Product Inspection and Corrosive Atmosphere

Instructions for inspecting the unit and warnings about corrosive environments.

Typical Installation Diagram

Diagram showing the typical installation of a direct-vent water heater.

Mounting the Water Heater

Procedures and cautions for securely mounting the water heater to the wall.

Venting Safety and Requirements

Safety warnings and general requirements for direct-vent water heater venting.

Vent Length Calculations

Charts for calculating equivalent vent lengths based on elbows and pipe size.

High Altitude and Vent Length DIP Switch Adjustments

Guide to adjusting DIP switches for altitude and vent length for optimal operation.

Horizontal Venting Considerations

Details on input rate reduction and horizontal vent system installation.

Venting Notices and Preexisting Venting

Notices regarding venting, and procedures for inspecting existing venting systems.

Massachusetts Venting Regulations

Massachusetts specific requirements for gas appliance venting and CO detectors.

Horizontal Vent Terminal Location

Charts detailing minimum clearances for horizontal vent terminal placement.

Horizontal Vent Terminal Location (cont.)

Additional charts for horizontal vent terminal placement requirements.

Horizontal Vent Considerations

Warnings and advice for horizontal vent terminal placement, including condensate and clearances.

Joining Vent Pipes and Fittings

Procedures for sealing vent pipes and fittings using solvent cement.

Horizontal Vent Installation Details

Fastener types, sealing, and connecting vent pipes for horizontal installations.

Alternative Horizontal Vent Installations

Information on commercially available alternative horizontal vent termination kits.

Vent Riser Terminal Installation

Instructions for installing vent riser terminals for horizontal and combustion air inlets.

Vertical Vent Installation

Step-by-step guide for installing vertical vent systems through the roof.

Vertical Vent Terminal Location

Chart detailing minimum clearances for vertical vent terminal placement.

Standard Vertical Vent Termination

Diagram illustrating a standard vertical vent termination setup.

Alternative Vertical Vent Termination

Information on alternative vertical vent termination kits and connection warnings.

Water Quality and Treatment

Recommended water quality levels and advice on water treatment accessories.

Water Supply Cautions

Crucial cautions regarding water supply conditions and connections to prevent damage.

Thermal Expansion Control

Explanation of thermal expansion and methods to control it, like installing an expansion tank.

Water Supply Connections and Pressure

Guidelines for water supply connections, pressure requirements, and thermal expansion.

Water Supply Installation Steps

Detailed steps for installing water shut-off valves, service valves, and ensuring drainability.

Water Piping Arrangement and Relief Valve

Diagram of water piping with service valves and requirements for the pressure relief valve.

Pipe Insulation and Condensate Drainage

Instructions for insulating pipes and properly draining condensate from the unit.

Gas Supply System and Piping

Requirements for the gas supply system, including type, piping, and pressure.

Determining Gas Pipe Size

Procedures and tables for determining the correct gas pipe size based on load and pressure.

Gas Pipe Sizing Tables

Tables providing pipe sizing data for natural gas and propane based on length and capacity.

Gas Supply Installation Steps

Step-by-step guide for installing the gas supply line, including valves and traps.

Gas Leak and Pressure Testing

Procedures for safely testing the gas supply system for leaks and pressure.

High-Altitude Installation Adjustments

Guidelines for adjusting the water heater for installations above 2000 ft.

Electrical Wiring Requirements

Safety and code requirements for electrical wiring, grounding, and connections.

Electrical Wiring Diagram

Detailed wiring diagram showing all electrical connections and components.

Insulation Blankets and Installation Precautions

Information on insulation blankets and general precautions for installation.

Installation Checklist

A detailed checklist to ensure all installation steps and requirements have been met.

Using Your Water Heater

Activating the Water Heater

Step-by-step instructions for safely starting the water heater.

Activating and Shutting Off the Water Heater

Detailed procedures for starting up and shutting down the water heater.

Safety Precautions for Operation

General safety warnings related to operation, flammable vapors, and overheating.

Setting the Water Temperature

Dangers of high water temperatures and factors for selecting temperature settings.

Determining and Adjusting Water Temperature

How to determine water temperature at the faucet and adjust settings using the display.

Setting Water Temperature Steps

Step-by-step guide for adjusting the water temperature setting on the control.

WiFi Setup

Instructions for connecting the water heater to a WiFi network via the EcoNet app.

Recirculation Pump Control

Information on controlling an external recirculation pump, including modes and sizing.

Recirculation Pump Installation Diagram

Diagram illustrating the typical setup for recirculating pump control.

Recirculation Pump Installation with Comfort Valve

Illustrates recirculation pump installation using a Comfort Valve Kit for specific applications.

Recirculation Pump Installation Steps

Step-by-step guide for physically installing the recirculation pump and connecting its wiring.

Recirculation Pump Operation Modes

Explanation of Timer, Energy Saver, and Performance modes for recirculation pump operation.

Recirculation Pump On-Demand and Schedule Modes

Details on On-Demand and Schedule modes for recirculation, requiring WiFi capability.

Water Saving Control Activation

Instructions on how to activate the water saving control feature via DIP switch settings.

Water Saving Control Configuration

Steps to finalize the water saving control setup and reapply other DIP switch settings.

Caring for Your Water Heater

Venting System and Condensate Collector Inspections

Guidelines for annual inspection of the venting system and condensate collector.

Burner Inspection Procedure

Steps for safely inspecting the water heater's burner flames.

General Care and Water Filter Cleaning

Procedures for general cleaning of the unit and cleaning the water filter.

Water Filter Cleaning Steps

Detailed instructions for removing, cleaning, and reinstalling the water filter.

Preventive Maintenance Tasks

Routine preventive maintenance tasks including checking filters, vents, gas/water pipes, and relief valves.

Draining the Water Heater - Initial Steps

Initial steps for draining the water heater, including turning off power and gas, and opening faucets.

Draining the Water Heater - Completion and Restart

Steps to complete draining, reassemble parts, and restart the water heater.

Freeze Protection Methods

Precautions and methods to protect the water heater and pipes from freezing conditions.

Vacation and Extended Shutdown Procedures

Guidance for preparing the water heater for extended periods of non-use or shutdown.

Troubleshooting Chart - No Hot Water

A chart to diagnose and resolve issues related to not enough or no hot water.

Troubleshooting Chart - Water Temperature Issues

A chart to diagnose and resolve problems related to water being not hot enough or too hot.

Service Error Code Chart Overview

Introduction to the diagnostic system and initial steps when an error code is displayed.

Service Error Code List and Solutions

A list of specific error codes, their possible causes, and recommended solutions.

Call for Assistance Information

Information on how to contact service personnel and what details to provide.

Maintenance Notice Setup

Steps to set up the maintenance reminder feature for flushing and filter replacement.

Clearing Error Code 88

Procedure to clear error code "88" after performing recommended maintenance tasks.

Parts Replacement

Parts Ordering and Component Diagram

Information on how to order replacement parts and a diagram of the unit's components.

Limited Warranty

Warranty Terms and Exclusions

Details the warranty coverage periods, terms, and specific exclusions.

Obtaining Warranty Claim Assistance

Instructions on how to obtain warranty assistance and the required documentation.

Rheem RTGH Series Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
Ignition System	Electronic
Energy Factor	0.82 - 0.94
Vent Type	Direct Vent
Installation Location	Indoor or Outdoor
Dimensions	Varies by model
Weight	Varies by model
Warranty	12 years heat exchanger, 5 years parts