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Rinnai RC80HPI - User Manual

Rinnai RC80HPI
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— 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.
• Immediately call your gas supplier from a neighbor’s phone.
Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
— Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
WARNING: If the information in these instructions is not
followed exactly, a fire or explosion may result causing
property damage, personal injury or death.
Operation and Installation Manual
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
Table of Contents .................... 2
Consumer Safety Information .. 4
Operating Instructions .............. 5
Maintenance ............................ 12
Error Codes ............................. 13
Installation Instructions ............ 17
Consumer Support ................... 40
French Version ........................ 42
Direct Vent Tankless Water Heater
Register your product at www.rinnairegistration.com or
call 1-866-RINNAI1 (746-6241)
ANS Z21.10.3
●
CSA 4.3
FOR INDOOR APPLICATIONS ONLY
RC80HPi ............. REU-KA2530FFUD-US
RC98HPi ............. REU-KA3237FFUD-US
FOR OUTDOOR APPLICATIONS ONLY
RC80HPe ............ REU-KA2530WD-US
RC98HPe ............ REU-KA3237WD-US

Table of Contents

Other manuals for Rinnai RC80HPI

Preview: Technical Manual
Technical Manual2 pages

Questions and Answers

  • S
    Sean RodriguezAug 19, 2025
    Why is my Rinnai Water Heater not igniting?
    • J
      Jacqueline HamptonAug 19, 2025
      If your Rinnai Water Heater isn't igniting, there could be several reasons. First, check that the gas is turned on at the water heater, gas meter, or cylinder. Make sure the gas type and pressure are correct and that the gas line, meter, and regulator are properly sized. Bleed any air from the gas lines. Also, verify the dip switches are set correctly and the appliance is properly grounded. Try disconnecting EZConnect™ or MSA controls to isolate the problem. Ensure the igniter is working and check its wiring for damage. Examine the gas solenoid valves for open or short circuits. Remove the burner cover and ensure all burners are correctly seated. Finally, remove the burner plate and inspect the burner surface for any condensation or debris.
  • X
    xkellyAug 21, 2025
    What causes a Rinnai Water Heater to display an Over Temperature Warning?
    • C
      calvin94Aug 22, 2025
      An over temperature warning on your Rinnai water heater can be caused by several factors. Check for any restrictions in the airflow around the unit and vent terminal. Low water flow in a circulating system can also lead to short-cycling, triggering the warning. Additionally, inspect the combustion chamber and exhaust piping for any foreign materials. Finally, a clogged heat exchanger can cause the unit to overheat.
  • S
    sandyatkinsAug 25, 2025
    What to do if the Rinnai Water Heater has Scale Build-up in Heat Exchanger?
    • C
      Chris BrownAug 25, 2025
      If your Rinnai water heater is experiencing scale build-up in the heat exchanger, you should flush the heat exchanger. Refer to the instructions in the manual for the flushing procedure. If flushing doesn't resolve the issue, consider replacing the heat exchanger.
  • T
    Taylor SawyerAug 28, 2025
    How to fix a Rinnai RC80HPI with a Thermal Fuse problem?
    • C
      Chase CarterAug 28, 2025
      To troubleshoot a thermal fuse issue with your Rinnai water heater, begin by verifying that the unit's gas type matches the gas being used. Check for any restrictions in airflow around the unit and vent terminal. In circulating systems, check for low water flow causing short-cycling. Ensure the dip switches are set to the correct position. Inspect the combustion chamber and exhaust piping for foreign materials. Examine the heat exchanger for cracks or separations and check its surface for hot spots indicating blockage due to scale build-up. Measure the resistance of the safety circuit. Confirm that the high fire and low fire manifold pressure is correct and check for improper conversion of the product.
  • E
    Evan JensenAug 30, 2025
    How do I troubleshoot a Rinnai RC80HPI Water Heater with No Code?
    • R
      ruizstevenAug 30, 2025
      If your Rinnai water heater shows no code when water flow is activated, start by cleaning the inlet water supply filter. For new installations, ensure the hot and cold water lines are not reversed. Check for bleed over by isolating the unit from the building by turning off the hot water line. Isolate the circulating system if one is present. Open the pressure relief valve; if water flows, there's bleed over in your plumbing. Make sure you have the minimum flow rate required to activate the unit and that the turbine spins freely. Measure the resistance of the water flow control sensor and check for DC shorts at components.
  • M
    matthewhooverSep 1, 2025
    Why does my Rinnai RC80HPI Water Heater have a Combustion Fan Failure?
    • A
      anthony99Sep 1, 2025
      If your Rinnai water heater's combustion fan has failed, first ensure the fan can turn freely. Next, check the wiring harness to the motor for any damaged or loose connections. Finally, measure the resistance of the motor winding.
  • E
    Elizabeth BrownSep 3, 2025
    What causes a Heat Exchanger Outgoing Temperature Sensor Fault in Rinnai RC80HPI?
    • S
      Seth GordonSep 3, 2025
      If your Rinnai water heater displays a heat exchanger outgoing temperature sensor fault, begin by checking the sensor wiring for any damage. Then, measure the resistance of the sensor. You should also clean the sensor of any scale build-up. If the problem persists, consider replacing the sensor.
  • A
    Ashley EdwardsSep 5, 2025
    How to resolve a Flame Sensing Device Fault on a Rinnai RC80HPI?
    • M
      moodyandrewSep 5, 2025
      To address a flame sensing device fault on your Rinnai water heater, first ensure the flame rod is touching the flame when the unit fires. Check all wiring to the flame rod for any damage. Remove the flame rod and inspect it for carbon build-up; clean it with sandpaper if necessary. Inspect the burner chamber for any foreign material blocking the flame at the flame rod. Measure the micro amp output of the sensor circuit with the flame present. If none of these steps resolve the issue, replace the flame rod.
  • T
    thoganSep 8, 2025
    What does a Burner Sensor Circuit Error mean on my Rinnai RC80HPI Water Heater?
    • M
      Michael LaraSep 8, 2025
      If your Rinnai water heater is showing a burner sensor circuit error, you should check the sensor wiring and the PC board for any signs of damage. If you don't see any damage, try replacing the sensor.
  • S
    stephen71Sep 10, 2025
    How to fix Outgoing Water Thermistor Fault in Rinnai Water Heater?
    • G
      Gary WagnerSep 10, 2025
      To fix an outgoing water thermistor fault in your Rinnai water heater, start by checking the sensor wiring for any damage. Next, measure the resistance of the sensor. Clean the sensor of any scale build-up that may be present. If the issue continues, replace the sensor.

Summary

Consumer Safety Information

Safety Definitions

Defines hazard symbols and safety terms used in the manual.

Safety Behavior and Practices

Outlines essential safe operating procedures and precautions.

Safety Features

Describes the built-in safety mechanisms of the appliance.

Description of Operation

Operating Instructions

Features Available on Temperature Controllers

Lists functions and capabilities of various temperature controllers.

Temperature Controllers - Models

MC-91-1 US & MCC-91-1 US

Details for standard and commercial controller models.

MC-502 RC-1 US-S (Wireless)

Specifications and features of the wireless controller model.

How to Set the Temperature

Temperature Controller Settings

Explains how to adjust the water temperature using the controller.

Temperature Options Without a Temperature Controller

Setting the Sound Volume (Voice Prompt)

Using the Water Smart; Bath Fill Function

Overview

Introduction to the bath fill feature and its exclusivity.

Setting the Water Volume

Procedure for selecting the desired water volume for bath filling.

Setting Controller to Mute

Setting the Clock

Maintenance

Cleaning

Step-by-step guide for cleaning the appliance components.

Vent System

Inspection requirements for the ventilation system.

Motors

Maintenance guidelines for the unit's motors.

Temperature Controller

Instructions for cleaning the temperature controller.

Lime; Scale Build-up

Addresses scale-related error codes and flushing procedures.

Snow Accumulation

Precautionary measures for vent terminal clearance from snow.

Visual Inspection of Flame

Guidance on checking the burner flame pattern.

Error Codes

Trouble Shooting for Common Issues

Accessing Operating Information

Water Quality

Flushing the Heat Exchanger (Error Code: LC or 00)

Installation Instructions

General Instructions

General guidelines and warnings for appliance installation.

Clearances from Appliance

Attachment of the Water Heater

Instructions for securely mounting the water heater.

Electrical Connection

Gas Piping

General Instructions

Guidelines and safety precautions for gas line installation.

Pipe Sizing Procedure - Example

Water Piping

General Instructions

Guidelines for connecting water lines and system safety.

Pressure Relief Valve

Requirements and installation for the pressure relief valve.

Freeze Protection

Features and methods to prevent the unit from freezing.

Manual draining of the water heater

Running a low volume of water through the water heater to prevent freezing

When the water heater or external piping has frozen

Recommended Piping for Basic Installation

Recommended Piping for Circulation Systems

Optional Piping for Circulation Systems

Venting Instructions

Intake; Exhaust Guidelines

Rules and requirements for direct vent air intake and exhaust.

Condensate

Information regarding condensate drainage and trap.

Maximum Vent Length

Vent Products

Flue Terminal Clearances (ANS Z21.10.3 • CSA 4.3)

Additional Clearances - Vent Terminal (RC80 HPi, RC98 HPi)

Additional Clearances (RC80 HPe, RC98 HPe)

Flue Installation (RC80 HPi, RC98 HPi)

Horizontal Termination

Instructions for installing horizontal vent piping.

Vertical Termination

Instructions for installing vertical vent piping.

High Altitude Installations

Connecting Multiple Water Heaters

Temperature Controller Installation

Location

Guidelines for selecting an appropriate controller mounting location.

Configurations

Details on connecting multiple temperature controllers.

Cable Lengths and Size

Specifications for temperature controller wiring cable.

Mounting the Controller

Operating Instructions

FOR YOUR SAFETY READ BEFORE OPERATING

Critical safety warnings and precautions before initial operation.

OPERATING INSTRUCTIONS

Step-by-step guide for starting and operating the appliance.

TO TURN OFF GAS TO APPLIANCE

Procedure for safely shutting off the gas supply to the unit.

Technical Data

Pressure Drop Curve

Graph illustrating pressure loss versus water flow rate.

Outlet Flow Data

Graph showing water flow rate versus temperature rise.

Space Heating

Temperature Setting

Recommendations for setting temperature for space heating.

Pumps

Requirements for pumps used in space heating applications.

Replacement

Considerations for replacing existing heating sources.

Iron Components

Warnings regarding the use of iron components in heating systems.

Dimensions

Ladder Diagram

Consumer Support

Warranty Information

Fields for recording purchase and installation details for warranty.

Limited Warranty

Overview of what the warranty covers and its terms.

How long does coverage last?

Details warranty periods for different components and applications.

Limited Warranty Details

What will Rinnai do?

Rinnai's responsibilities for product repair or replacement.

How do I get service?

Procedures for obtaining warranty service and contacting Rinnai.

What is not covered?

List of exclusions and conditions not covered by the warranty.

Limitation on warranties

Legal disclaimers and limitations on warranty coverage.

Rinnai RC80HPI Specifications

General IconGeneral
BrandRinnai
ModelRC80HPI
CategoryWater Heater
LanguageEnglish

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