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Rinnai REU-KB3237WD-US User Manual

Rinnai REU-KB3237WD-US
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Direct Vent Tankless Water Heater
Installaon and Operaon Manual


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WARNING

This manual provides informaon on the installaon, operaon, and maintenance of the water heater. For proper
operaon and , 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 4-32.
The consumer must read the enre manual to properly operate the water heater and to have regular maintenance
performed.

FOR INDOOR APPLICATIONS ONLY
RU80i .................... --
RU98i .................... --
FOR OUTDOOR APPLICATIONS ONLY
RU80e ................... --
RU98e ................... --

Table of Contents

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Rinnai REU-KB3237WD-US Specifications

General IconGeneral
BrandRinnai
ModelREU-KB3237WD-US
CategoryWater Heater
LanguageEnglish

Summary

Important Safety Information

Safety Definitions

Defines safety alert symbols like DANGER, WARNING, and CAUTION.

Safety Behaviors and Practices for the Consumer and Installer

Installation Instructions

Installer Qualifications

Details the necessary skills and certifications for proper installation.

General Instructions

Covers essential "DO NOT" and "MUST DO" guidelines for installation.

Type of installation

Specifies approved installation types for residential and manufactured homes.

Prepare for installation

Determine Installation Location

Environment

Discusses factors like corrosive compounds and air quality affecting installation location.

Water Quality

Explains how water quality impacts the heat exchanger and warranty coverage.

Direct Vent Terminal Clearances (Indoor Units)

Other Than Direct Vent Terminal Clearances (Outdoor Units)

Additional clearances

Unit clearances

Freeze Protection

Maximum vent length

Maximum vent length with concentric venting

Tables for calculating maximum vent length based on elbows and termination type.

Vent length using short radius elbow

Details vent length limits for short radius elbows.

Vent length using long radius elbow

Details vent length limits for long radius elbows.

Maximum vent length for Centrotherm 2 Pipe InnoFlue Vent System

Specifies vent length limits for Centrotherm systems.

Checklist to Determine Installation Location

Mount to Wall

Remove the Front Panel

Installation of venting (indoor models only)

Venting Guidelines

Flue Installation with Concentric Venting (indoor models only)

Horizontal Termination

Illustrates horizontal vent termination installation.

Vertical Termination

Illustrates vertical vent termination installation.

Flue Installation with Centrotherm Venting (indoor models only)

Vertical Termination

Diagram and guidelines for vertical termination with Centrotherm venting.

Horizontal Termination

Diagram and guidelines for horizontal termination with Centrotherm venting.

Twin Pipe PVC/CPVC Vent Installation

Twin Pipe PVC/CPVC Vent Installation Requirments

Determining Total System Equivalent Length

Maximum Equivalent Vent Length Tables:

Natural Gas Units

Tables for calculating maximum vent lengths for natural gas units.

Maximum Equivalent Vent Length Tables (continued):

Propane Units

Tables for calculating maximum vent lengths for propane units.

Adaptor Installation

Adaptor Installation (continued)

Installation of PVC/CPVC Vent and Intake Air Piping:

Certified PVC/CPVC Vent Termination Options

Certified PVC/CPVC Vent Termination Options (continued)

IPEX CONCENCTRIC VENT KIT (CVK) CLEARANCES:

Certified PVC/CPVC Vent Termination Options (continued)

3” and 4” Low Profile Vent Termination Kits

Information on installing IPEX Low Profile termination kits.

Certified PVC/CPVC Vent Termination Options (continued)

Certified PVC/CPVC Vent Termination Options (continued)

Pitched Roof Termination Clearances:

Parts Information

Parts Information (continued)

PVC/CPVC Equivalent Vent Length Calculation Sheet

Condensate (indoor models only)

Checklist for Venting and Condensate (indoor models only)

A checklist to verify correct venting and condensate drainage.

Installation of Plumbing

Pressure Relief Valve Requirements

Covers requirements and installation of pressure relief valves.

Isolation Valves

Explains the importance and installation of isolation valves.

Piping Requirements

Outlines general piping requirements and material approvals.

Isolation Valves and Pressure Relief Valve

Piping Diagram for Basic Installation

Connect Water Heater to Water Supply

Installation of Gas Supply

Size the gas pipe

Connect Electricity

Adjust for High Altitude

Adjust for Vent Length (indoor models only)

Checklist for Gas and Electricity

Installation of Temperature Controller

Controller Location

Recommendations for choosing a suitable location for the temperature controller.

Cable Lengths and Sizes

Details on maximum cable lengths and wire gauge for controllers.

Configurations

Explains how temperature controllers can be wired and their configurations.

Mounting the controller

Final Checklist

Technical Data

Specifications

Provides detailed technical specifications for different models.

Dimensions

Pressure Drop Curve

Outlet Flow Data

Ladder Diagram

Recirculation Mode

Recirculation Mode

Economy Mode

Details operation and pump cycles for Economy mode recirculation.

Comfort Mode

Details operation and pump cycles for Comfort mode recirculation.

Operation Instructions

Consumer Operation Guidelines for the Safe Operation of your Water Heater

How to use the Temperature Controller

How to Set the Temperature

Temperatures Available with a Controller

Alternate Temperature Settings

Lists available temperature settings and controller compatibility.

Temperature Options Without a Temperature Controller

Diagnostic Codes

Diagnostic Codes and Remedies

Required Maintenance

Cleaning

Instructions for cleaning internal components and the exterior cabinet.

Addressing Scale and Snow Issues

Covers lime/scale buildup and snow accumulation impacting performance.

Water Filter Maintenance

Steps to clean the water inlet filter.

Pressure Relief Valve:

Visual Inspection of Flame

Freeze Protection

Winterizing

Flushing the heat exchanger

Manual draining of the water heater

State Regulations

Replacement Parts

EXTEND THE LABOR COVERAGE UNDER YOUR LIMITED WARRANTY*

Limited Warranty for Ultra Series RU80, RU98

How do I get service?

What is not covered?

Lists conditions and factors that are excluded from warranty coverage.

Limitation on Warranties

Clarifies warranty limitations and disclaimers.

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