Rinnai RUC80i Operation Instructions Manual
Direct vent tankless water heater for indoor/outdoor applications only
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- Installation and operation manual (142 pages) ,
- Training program (86 pages) ,
- How to use manual (194 pages)
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Direct Vent Tankless Water Heater
FOR INDOOR APPLICATIONS ONLY
RUC80i .................. REU-KBD2530FFUD-US
RUC90i .................. REU-KBD2934FFUD-US
RUC98i .................. REU-KBD3237FFUD-US
FOR OUTDOOR APPLICATIONS ONLY
RU80e ................... REU-KB2530WD-US
RU90e ................... REU-KB2934WD-US
RU98e ................... REU-KB3237WD-US
Important Facts about your Water Heater
Thank you for purchasing a Rinnai Tankless Water Heater. For proper operation and safety, it is
important to follow the instructions and adhere to all safety precautions.
Read all of the instructions and the warranty thoroughly before operating this water heater. Keep this
manual in a safe place.
NOTICE: Rinnai sometimes shares customer contact information with businesses that we believe provide
products or services that may be useful to you. By providing this information, you agree that we can
share your contact information for this purpose. If you prefer not to have your information shared with
these businesses, please contact customer service and ask not to have your information shared. We
will however, continue to contact you with information relevant to the product(s) you registered and/or
you account with us.
WARNING
— 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 licensed professional.
Operation Instructions
If the information in these instructions is not followed exactly, a fire or
explosion may result causing property damage, personal injury, or death.
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Table of Contents
Related Manuals for Rinnai RUC80i
Summary of Contents for Rinnai RUC80i
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Page 1: Operation Instructions
RU98e ....REU-KB3237WD-US Important Facts about your Water Heater Thank you for purchasing a Rinnai Tankless Water Heater. For proper operation and safety, it is important to follow the instructions and adhere to all safety precautions. Read all of the instructions and the warranty thoroughly before operating this water heater. Keep this manual in a safe place. -
Page 2: For Your Safety Read Before Operating
Consumer Operation Guidelines for the Safe Operation of your Water Heater FOR YOUR SAFETY READ BEFORE OPERATING WARNING If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury, or loss of life. ... -
Page 3: How To Use The Temperature Controller
Always check the water temperature before entering a water must be treated and/or the heat exchanger shower or bath. flushed regularly. Rinnai provides a “Scale Control System” that offers superior lime scale prevention and Do not use this appliance if any part has been under corrosion control by feeding a blend of control water. -
Page 4: How To Set The Temperature
How to Set the Temperature This water heater requires a minimum flow rate to operate. This rate can be found on the specification page in this manual. In some cases when you are not getting hot water or if the water alternates between hot and cold, it is due to the water flow being below or close to the minimum flow rate. - Page 5 Temperatures Available with a Controller The water heater can deliver water at only one temperature setting at a time. The available temperatures are provided below. A temperature lower than 98° F (37° C) can be obtained at the tap by mixing with cold water. To change the temperature scale from Celsius to Fahrenheit or vice versa, press and hold the “On/Off”...
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Page 6: Diagnostic Codes
Temperature Options Without a Temperature Controller The default temperature setting for this appliance installed without a temperature controller is 120° F (49° C). If desired, the temperature setting can be changed to 140° F (60° C) by adjustment of a switch. Set SW5 in DIPSW 1 to ON to obtain 140°... -
Page 7: Diagnostic Codes And Remedies
Diagnostic Codes and Remedies WARNING Some of the checks below should be done by a licensed professional. Consumers should never attempt any action that they are not qualified to perform. Code Definition Remedy Power interruption during Bath Fill (Water will not flow when Turn off all hot water taps. - Page 8 LC2,…) Off button on the temperature controller 5 times. Repeated LC codes will eventually lockout “LC”) the water heater. Please call Rinnai technical department. Maintenance has been Indicates a licensed professional performed maintenance or corrected an issue. performed Clean inlet water supply filter.
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Page 9: Required Maintenance
Required Maintenance The appliance must be inspected annually by a licensed professional. Repairs and maintenance shall be performed by a licensed professional. The licensed professional must verify proper operation after servicing. WARNING To protect yourself from harm, before performing maintenance: ... -
Page 10: Visual Inspection Of Flame
WARNING drain down solenoid valves be purchased and Testing the pressure relief valve should only be installed that will automatically drain the unit if performed by a licensed professional. Water power is lost. These are available in a kit, discharged from the pressure relief valve could cause 104000059. -
Page 11: Flushing The Heat Exchanger
An LC0~LC9 or “00” or 58 diagnostic code indicates the unit is beginning to lime up and must be flushed. Failure to flush the appliance will cause damage to the heat exchanger. Damage caused by lime build-up is not covered by the unit’s warranty. Rinnai strongly recommends installation of isolation valves to allow for flushing of the heat exchanger. -
Page 12: Manual Draining Of The Water Heater
Manual Draining of the Water Heater WARNING To avoid burns, wait until the equipment cools down before draining the water. The water in the appliance will remain hot after it is turned off. If the water heater is not going to be used during a period of possible freezing weather, it is recommended that the water inside the water heater be drained. -
Page 13: State Regulations
State Regulations NOTICE BEFORE INSTALLATION This direct-vent appliance must be installed by a licensed professional. If you are not properly trained, you must not install this unit. IMPORTANT: In the State of Massachusetts (248 CMR 4.00 & 5.00) For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied:... -
Page 14: Replacement Parts
Replacement Parts The Technical Sheet that is located inside the front cover of the water heater contains a complete Gas Control Assembly Electrode / Flame Rod illustrated parts list. Tech Sheet Item No. Gas Control Assembly Electrode / Flame Rod Kit 116, 117 Fan Assembly / Motor Heat Exchanger... - Page 15 / thermostat, or timer, or an on-demand system is 12 years for residential applications and 5 years for commercial applications. [3] Period of coverage is reduced to 5 years from date of purchase if the Rinnai water heater temperature setting exceeds 160° F (71° C).
- Page 16 Limitation on Warranties No one is authorized to make any other warranties on behalf of Rinnai America Corporation. Except as expressly provided herein, there are no other warranties, expressed or implied, including, but not limited to warranties of merchantability or fitness for a particular purpose, which extend beyond the description of the warranty herein.
- Page 17 ADDITIONAL CONDITIONS OF EXTENDING THE LABOR COVERAGE UNDER THE LIMITED WARRANTY: The labor coverage does NOT extend if the RUC80i, RUC90i, RUC98i, RU80e, RU90e, and RU98e Tankless Water Heater is used for structure heating or in a closed loop application.