Rinnai RUS75e series User Manual

Direct Vent Tankless Water Heater
Installaon and Operaon Manual
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
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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 in this manual.
The consumer must read the enre manual to properly operate the water heater and to have regular maintenance
performed.

FOR INDOOR APPLICATIONS ONLY
RUCS65i ................ --
RUCS75i ................ --
FOR OUTDOOR APPLICATIONS ONLY
RUS65e ................. --
RUS75e ................. --



C US
U328-0700

Rinnai RUS75e series Specifications

General

Model	RUS75e series
Maximum Flow Rate	7.5 GPM
GPM @ 35°F Rise	7.5 GPM
Water Connection	3/4" NPT
Maximum BTU Input	180, 000 BTU/h
Temperature Range	98°F - 140°F
Ignition Type	Electronic
Electrical Requirements	120V, 60Hz
Warranty	12 years heat exchanger, 5 years parts, 1 year labor
Fuel Type	Natural Gas

Summary

Safety Definitions

DANGER

Indicates an imminently hazardous situation which, if not avoided, will result in personal injury or death.

WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in personal injury or death.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury.

Safety Behaviors and Practices for the Consumer and Installer

Installation Instructions (for the licensed professional)

Installer Qualifications

Details the skills and training required for licensed professionals performing installation.

General Instructions

Outlines essential rules and requirements that must be followed during installation.

Determine Installation Location

Water Quality

Specifies water quality requirements to prevent heat exchanger damage.

Environment

Considers air quality and corrosive compounds for installation site selection.

Direct Vent Terminal Clearances (Indoor Units)

Other Than Direct Vent Terminal Clearances (Outdoor Units)

Checklist to Determine Installation Location

Mount to Wall

Remove the Front Panel

Installation of Venting (indoor models only)

Approved Vent Manufacturers

Approved Vent Products

Venting Guidelines

Determining Vent Configuration

Maximum Vent Length

Flue Installation with Concentric Venting (indoor models only)

Flue Installation with Centrotherm Venting (indoor models only)

Vertical Termination

Horizontal Termination

Twin Pipe PVC/CPVC Vent Installation

Twin Pipe PVC/CPVC Vent Installation Requirements

IMPORTANT CONSIDERATIONS FOR LOCATION

Vent and Air Piping Materials

Installation of PVC/CPVC Vent and Intake Air Piping

Certified PVC/CPVC Vent Termination Options

Vent Termination Configurations

Termination Installation

Table 8: Approved PVC/CPVC Vent Configurations

Installation of Plumbing

Pressure Relief Valve Requirements

Isolation Valves

Piping Requirements

Isolation Valves and Pressure Relief Valve (PRV)

Connect Water Heater to Water Supply

Checklist for Plumbing

Installation of Gas Supply

Connect Electricity

Adjustment for High Altitude Installations

Adjustment for Vent Length (indoor models only)

Checklist for Gas and Electricity

Installation of Optional Temperature Controller

Controller Location

Cable Lengths and Sizes

Mounting the controller

Final Checklist

Technical Data

Specifications

Lists detailed technical specifications for the water heater models.

Consumer Operation Guidelines for the Safe Operation of your Water Heater

OPERATING INSTRUCTIONS

Step-by-step procedure for starting and operating the water heater.

How to Set the Temperature

How to use the Optional Temperature Controller

Diagnostic Codes

Diagnostic Information (on status monitor)

To Display Diagnostic Information (with controller)

Diagnostic Codes and Remedies

Required Maintenance

Cleaning

Lime / Scale Build-up

Flushing the Heat Exchanger