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Rinnai V75i User Manual

Rinnai V75i
80 pages
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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
V75i ....................... REU-VC2528FFU-US
V65i ....................... REU-VC2025FFU-US
FOR OUTDOOR APPLICATIONS ONLY
V75e ...................... REU-VC2528W-US
V65e ...................... REU-VC2025W-US

Table of Contents

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Rinnai V75i Specifications

General IconGeneral
BrandRinnai
ModelV75i
CategoryWater Heater
LanguageEnglish

Summary

Installation Instructions

Installer Qualifications

Requirements and skills for professional installers.

Type of Installation

Details on residential and mobile home certifications.

General Installation Guidelines

Key directives and prohibitions for installation.

Prepare for Installation

Parts and Tools Required

Lists components, tools, and materials needed for installation.

Determine Installation Location

Water Quality Considerations

How water quality impacts the heat exchanger and warranty.

Environmental Considerations

Factors in the surrounding environment affecting placement and corrosion.

Vent Termination Clearances

Clearance Requirements

Specifies required distances from vents to building elements and grade.

Unit Clearances

Clearances for Indoor Models

Specifies clearances for top, back, front, sides, and ground for indoor units.

Clearances for Outdoor Models

Specifies clearances for top, back, front, sides, and ground for outdoor units.

Installation of Venting (Indoor Models)

Venting Guidelines

Rules and restrictions for using approved venting materials and configurations.

Flue Installation (Indoor Models)

Flue Termination Diagrams

Visual guides for horizontal and vertical flue terminations with condensate collectors.

Condensate Management (Indoor Models)

Condensate Formation and Drainage

Explains condensate formation and mandatory drainage procedures.

Venting and Condensate Checklist

Verifies proper clearances, materials, slope, and maximum length for venting.

Plumbing Installation

Pressure Relief Valve Requirements

Mandates approved pressure relief valves and proper installation.

Piping and Isolation Valves

Recommends isolation valves and outlines piping requirements for potable water.

Water Supply Connections

Connecting to Water Supply Lines

Details how to connect cold and hot water supply lines to the unit.

Gas Supply Installation

Gas Supply Safety and General Instructions

Emphasizes safety warnings and general directives for gas line installation.

Electrical Connections

Electrical Safety and Grounding

Stresses safe electrical connection, grounding, and avoiding extension cords.

Altitude and Vent Length Adjustments

High Altitude Adjustment

Explains how to set DIP switches for different altitudes.

Vent Length Adjustment (Indoor Models)

Details setting DIP switch 1 based on vent length.

Temperature Controller Installation

Controller Mounting and Wiring

Guides on controller location, cable length, and parallel wiring configurations.

Final Installation Checklist

Pre-Operation Verification

Confirms all installation steps, clearances, and safety checks are complete.

Technical Specifications

Appliance Specifications

Details gas consumption, capacity, temperature, weight, and energy factor.

Unit Dimensions

Dimensional Drawings

Illustrates physical measurements and connection points for models.

Performance Curves

Pressure Drop Curves

Shows how pressure loss varies with water flow rate.

Water Flow Curves

Illustrates water flow capacity based on temperature rise.

Ladder Diagram

Electrical Wiring Schematic

Depicts the internal electrical connections and components of the unit.

Operation Instructions

Important Facts and Safety

Provides essential information and safety precautions for operation.

What to Do If You Smell Gas

Step-by-step emergency procedures for gas leaks.

Consumer Operation Guidelines

Safe Operation Warnings

Critical safety advice before operating the appliance.

Operating Instructions

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

Temperature Controller Usage

Using the Temperature Controller

Explains the function and use of the temperature controller.

Setting the Water Temperature

Temperature Adjustment Guide

Guides on adjusting temperature and understanding safety limits.

Diagnostic Codes

Displaying Diagnostic Information

How to access and interpret error codes displayed by the unit.

Diagnostic Codes and Remedies

Error Code Reference

Lists error codes, their definitions, and recommended solutions.

Required Maintenance

Cleaning and Vent System Checks

Instructions for cleaning components and inspecting the vent system.

Safety Checks and Protection

Pressure Relief Valve Testing

Procedures for testing the pressure relief valve.

Visual Flame Inspection

Verifies proper burner flame for correct operation.

Freeze Protection and Winterizing

Advice on protecting the unit from freezing and procedures for winter shutdown.

Flushing the Heat Exchanger

Scale Removal Procedure

Step-by-step guide to cleaning scale build-up using vinegar.

Manual Draining of the Water Heater

Draining Procedures

Steps for manually draining the unit and resuming operation.

State Regulations

Massachusetts Installation Requirements

Specific regulations for detectors and signage in MA.

Replacement Parts

Component Identification

Lists key components with their corresponding part numbers.

Consumer Warranty

Limited Warranty Coverage

Details covered items, periods, and Rinnai's responsibilities.

How to Get Service

Instructions on contacting for warranty repairs and service.

Warranty Exclusions

What is Not Covered

Lists conditions and causes not covered by the warranty.

Limitation on Warranties

Discusses implied warranties and legal rights.

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