Rinnai REU-VC2025W-US User Manual

Direct Vent Tankless Water Heater
Installaon and Operaon Manual
— Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other
appliance.
— 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 instrucons.
 If you cannot reach your gas supplier, call the re department.
— Installaon and service must be performed by a licensed professional.
This enre manual must be le for the consumer. The consumer must read and
refer to this manual for proper operaon and to maintain the water heater.
If the informaon in these instrucons is not followed exactly, a re or explosion
may result causing property damage, personal injury or death.
WARNING
READ ALL OF THE INSTRUCTIONS THOROUGHLY BEFORE INSTALLING OR OPERATING THIS WATER HEATER.
This manual provides informaon on the installaon, operaon, and maintenance of the water heater. For proper
operaon and safety, it is important to follow the instrucons and adhere to the safety precauons.
A licensed professional must install the water heater according to the exact instrucons on pages 4-27.
The consumer must read the enre manual to properly operate the water heater and to have regular maintenance
performed.
ANS Z21.10.3 ● CSA 4.3
FOR INDOOR APPLICATIONS ONLY
V94i ...................... REU-VC2837FFU-US
V94Xi .................... REU-VC2737FFU-US
V75i ...................... REU-VC2528FFU-US
V65i ...................... REU-VC2025FFU-US
FOR OUTDOOR APPLICATIONS ONLY
V94e ..................... REU-VC2837W-US
V75e ..................... REU-VC2528W-US
V65e ..................... REU-VC2025W-US
SANITATION
Low Lead Content
NSF/ANSI 372
C US

Rinnai REU-VC2025W-US Specifications

General

Type	Tankless
Fuel Type	Natural Gas
Maximum BTU Input	199, 000 BTU
Minimum BTU Input	15, 000 BTU
Energy Factor	0.82
GPM @ 45°F Rise	9.8 GPM
GPM @ 70°F Rise	6.3 GPM
Voltage	120V
Ignition Type	Electronic
Warranty	12 years heat exchanger, 5 years parts, 1 year labor

Summary

Important Safety Information

Safety Definitions

Defines hazard symbols like DANGER, WARNING, CAUTION.

Safety Behaviors and Practices

Installation Instructions

Installer Qualifications

Details skills required for professional installation.

Type of Installation

Specifies residential and manufactured home installation types.

Prepare for Installation

Determine Installation Location

Terminal Clearances

Additional Clearances for Indoor Models

Additional Clearances for Outdoor Models

Unit Clearances

Maximum Vent Length (Indoor Models)

Freeze Protection

Installation Location Checklist

Mounting the Water Heater

Removing the Front Panel

Venting Installation (Indoor Models)

Flue Installation and Condensate Management

Condensate Management (Indoor Models)

Venting and Condensate Checklist

Plumbing Installation

Pressure Relief Valve Requirements

Specifies requirements for installing pressure relief valves.

Isolation Valves and Piping Requirements

Recommends isolation valves and outlines piping requirements.

Basic Installation Piping Diagram

Connecting to Water Supply

Plumbing Checklist

Gas Supply Installation

Gas Pipe Sizing

Connecting Electricity

Adjusting for Altitude and Vent Length

Gas and Electricity Checklist

Temperature Controller Installation

Controller Configurations and Location

Explains controller setup, wiring, placement, and cable requirements.

Mounting the Temperature Controller

Final Installation Checklist

Technical Specifications

Unit Dimensions

Performance Data and Curves

Pressure Drop Curve

Illustrates pressure loss across different water flow rates.

Water Flow Curve

Shows water flow rate based on temperature rise.

Electrical Ladder Diagram

Operation Instructions

Important Facts and Safety

Key facts about the water heater and safety precautions.

Consumer Operation Guidelines

Step-by-step guide for safe operation and shutdown procedures.

Using the Temperature Controller

Explains how to operate and interact with the temperature controller.

Setting the Water Temperature

Detailed instructions on how to adjust the water temperature setting.

Available Temperature Settings

Lists available temperature ranges and options with/without a controller.

Diagnostic Codes and Troubleshooting

Displaying Diagnostic Information

How to access and view diagnostic codes and readings.

Troubleshooting Codes and Remedies

Lists diagnostic codes, their definitions, and recommended remedies.

More Diagnostic Codes and Remedies

Continues the list of diagnostic codes and their remedies.

Maintenance and Cleaning

General Maintenance Requirements

Outlines annual inspection, cleaning, and motor maintenance.

Water Quality and Scale Prevention

Addresses water quality impact, scale build-up, and prevention.

Cleaning the Water Filter

Steps for cleaning the water inlet filter.

Pressure Relief Valve and Flame Inspection

Procedures for testing the pressure relief valve and inspecting the flame.

Winterization Procedures

Recommendations for winterizing the water heater for gas, water, electric, and vent.

Flushing the Heat Exchanger

Detailed steps for flushing the heat exchanger to remove lime/scale build-up.

Manual Draining and Freeze Prevention

Instructions for manually draining the unit and low-flow freezing prevention.

State and Local Regulations

Massachusetts Regulations

Details specific requirements for carbon monoxide detectors and signage in MA.

Replacement Parts

Consumer Warranty Information

Warranty Coverage and Duration

Outlines what is covered, coverage periods, and service contact information.

Warranty Exclusions and Limitations

Lists items not covered by warranty and legal limitations.