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Rinnai RUCS65i User Manual

Rinnai RUCS65i
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Direct Vent Tankless Water Heater
Do not store or use gasoline or other flammable 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.
If you cannot reach your gas supplier, call the fire department.
may result causing property damage, personal injury, or death.
WARNING
READ ALL OF THE INSTRUCTIONS THOROUGHLY BEFORE INSTALLING OR OPERATING THIS WATER HEATER.
safety
performed.
ANSI Z21.10.3 CSA 4.3
FOR INDOOR APPLICATIONS ONLY
RUCS65i ................ REU-KCM2025FFU-US
RUCS75i ................ REU-KCM2528FFU-US
FOR OUTDOOR APPLICATIONS ONLY
RUS65e ................. REU-KCM2025W-US
RUS75e ................. REU-KCM2528W-US
SANITATION
Low Lead Content
NSF/ANSI 372
C US
U328-0700(00)
060 00012 32698 7

Table of Contents

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Rinnai RUCS65i Specifications

General IconGeneral
TypeTankless Water Heater
Flow Rate @ 35°F Rise6.5 GPM
Flow Rate @ 45°F Rise5.1 GPM
Flow Rate @ 70°F Rise3.3 GPM
Maximum BTU Input150, 000 BTU/h
Temperature Range98°F - 140°F
Electrical Requirements120 VAC
Warranty12 years on heat exchanger, 5 years on parts, 1 year on labor
Fuel TypeNatural Gas
Vent Size3" or 4"

Summary

Safety Behaviors and Practices

Consumer and Installer Safety Guidelines

Essential safety practices for operating and maintaining the water heater.

Installation Instructions

Installer Qualifications

Required skills and training for professional installation.

General Installation Guidance

Key DO NOT and MUST DO guidelines for installation.

Installation Steps Overview

List of sequential steps for installing the water heater.

Installation Location and Environment

Determining Installation Location

Factors for choosing the right installation site.

Water and Environmental Quality

Impact of water quality and air quality on the unit.

Vent Terminal Clearances

Indoor Unit Vent Clearances

Required clearances for indoor vent terminations.

Outdoor Unit Vent Clearances

Required clearances for outdoor vent terminations.

Additional Venting Clearance Rules

Specific clearance rules for different vent configurations.

Unit Clearances and Freeze Protection

Unit Clearances

Minimum clearances around the unit for service and operation.

Freeze Protection Measures

Measures to protect the unit and water lines from freezing.

Venting Installation Procedures

Approved Venting Components

List of certified vent system components and suppliers.

Venting Guidelines and Configuration

Rules for proper venting and determining configuration.

PVC/CPVC Venting Specifics

Specific requirements for PVC/CPVC vent systems.

Vent Length Calculation

How to calculate total equivalent vent length.

Condensate Management

Condensate Handling and Prevention

Instructions for managing condensate and preventing damage.

Venting and Condensate Checklist

Checklist for ensuring proper venting and condensate management.

Plumbing and Water Connections

Pressure Relief Valve Requirements

Installation and maintenance of the pressure relief valve.

Isolation Valves and Piping

Recommended isolation valves and piping requirements.

PRV Installation and Maintenance

Detailed instructions for PRV installation and annual checks.

Gas Supply Installation

Gas Supply Connection and Safety

Procedures for connecting the gas supply safely.

Gas Pipe Sizing

Guidance for sizing gas pipes based on demand and codes.

Electrical Connections and Settings

Electrical Connection Requirements

Electrical requirements, grounding, and power sources.

Altitude and Vent Length Adjustments

Setting DIP switches for altitude and vent length.

Optional Temperature Controller

Controller Installation and Location

How to install, locate, and wire temperature controllers.

Controller Operation and Features

Using the optional controller for temperature selection and settings.

Final Checks and Specifications

Final Installation Checklist

A comprehensive checklist before final unit operation.

Technical Specifications

Key performance data, dimensions, and electrical information.

Operation Instructions

Important Facts and Safety Warnings

Key safety information and general facts about the water heater.

Consumer Operation Guidelines

Safe operating procedures and emergency actions.

Setting Water Temperature

How to adjust the water temperature and associated safety warnings.

Diagnostic Codes and Troubleshooting

Understanding Diagnostic Codes

Codes displayed on the unit and their meanings.

Diagnostic Codes and Remedies

Troubleshooting steps for common error codes.

Required Maintenance

Routine Maintenance Procedures

Cleaning, vent inspection, motor care, and controller cleaning.

Flushing the Heat Exchanger

Procedure for removing lime/scale buildup from the heat exchanger.

Freeze Protection and Winterization

Freeze Protection Measures

Measures to protect the unit and water lines from freezing.

Winterization Recommendations

Practices for preparing the unit for cold weather.

Manual Draining

Manual Draining Procedure

Steps for draining the water heater for storage or freezing prevention.

State Regulations

Massachusetts Specific Regulations

Specific installation requirements for Massachusetts.

Parts and Warranty Information

Replacement Parts

Part numbers and illustrations for common replacement components.

Limited Warranty Details

Details on warranty coverage, duration, and claims process.

What is Not Covered

Conditions and issues not included in the warranty coverage.

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