Related Manuals for Navien NR-20DU
Summary of Contents for Navien NR-20DU
- Page 1 Navien America Inc. 20 Goodyear, Irvine, CA 92618, TEL : 949-420-0420, FAX : 949-420-0430 BG-E-MU-10-01 Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html...
- Page 2 NR-20DU Keep this manual near this remote controller for future reference whenever maintenance or service is required. Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html...
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Page 3: Table Of Contents
Setting the initial number of activating units for Cascade systems Setting the temperature of DHW storage tank usage mode Additional features for Cascade systems About errors and icons About scale warning Basic Troubleshooting and Frequently Asked Questions Error Code Guide Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html... -
Page 4: Safety Instructions
Indicates a potentially hazardous situation that, if not If you do not follow these instructions exactly, a fire avoided, could result in property or explosion may result causing property damage, damage. personal injury or loss of life. Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html... -
Page 5: Included Items
When you open the box, you will find the following items with the remote controller. Check the box for each of the following items before installing the remote controller. User Manual Extension Cable 2 Tapping Screws Wall Mounting Bracket Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html... -
Page 6: Connecting The Extension Cable
3. Connect the end of the extension cable to the port on the front panel of the water heater. cable connected to the remote controller. 2. Pass the other end of the extension cable through the hole in the bracket. Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html... -
Page 7: Attaching The Wall Mounting Bracket
1. Affix the bracket securely to the wall by fastening 2 screws to the wall or to the 2 holes in the wall receptacle. On the wall In the wall receptacle 2. Hang the remote controller on the bracket by aligning the hooks. Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html... -
Page 8: Remote Controller
Lock button Access the timer settings. Locks the other button operations. Up button Power button Increase the temperature Turns the remote controller or value. on or o . Down button OK button Decrease the temperature or value. Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html... -
Page 9: Lcd Display Icons
Recirculation Mode. Displays the current time. Hot water is in use. Displays the current set Water heater operation is in temperature. progress. An error code will appear on the Operations are locked. display. Operating in energy saving mode. Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html... -
Page 10: Turning The Controller On Or Off
• The LED indicator turns green. • Hot water temperature is displayed. Note • When an error occurs, the LED indicator turns RED and blinks (except for Cascade mode). • The backlight stays on for 8 seconds when a button is pressed. Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html... -
Page 11: Setting The Water Temperature
(60°C), check the High temperature mode in the next section. Setting the water temperature above 125°F (52°C) can cause instant scalding • The settings are automatically saved or severe burns. when you do not press any buttons for 5 seconds. Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html... -
Page 12: Entering High Temperature Mode (Commercial Mode)
3 seconds. • Commercial mode is only available for select models. Refer to the Operation To prevent instant scalding or severe Manual supplied with the water heater. burns, check the set temperature before using hot water. Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html... -
Page 13: Entering Lock Mode
• The Lock icon appears on the display. • All buttons except for Lock button are locked. Note • Resetting errors or alarms is still available with Lock Mode activated. • You can change the settings from the front panel with Lock Mode activated. Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html... -
Page 14: Setting The Clock
Setting the clock Press the Timer button. Adjust the minutes by pressing the Up or Down Button. Press the OK button to set the minutes. Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html... - Page 15 Downloaded from https://gadgetsgo.com/NR-20DU-instant-efficient-hot-heating-boiler-rc.html Once the minutes are set, adjust the hour by Press the OK button to finish and save the updated pressing the Up or Down button. time.
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Page 16: Setting The Recirculation Timer
Setting the Recirculation timer Press the Timer button twice to set the Set the recirculation activation time by pressing Recirculation timer. the Up or Down button. Reservation Schedule #1 is ready to be set. Press the OK button to set the deactivation time. Note The recirculation timer settings are divided in 30 minute increments. - Page 17 Set the deactivation time by pressing the Up or Press the OK button to save the timer setting. Down button. Repeat these procedures for Reservation Schedule Settings #2 and #3.
- Page 18 During the reservation schedule, the preheating icon turns on and the Reservation area starts flashing. Note This is applied to A models with the preheating function only.
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Page 19: Canceling All Timer Settings
Canceling all timer settings Press and hold the Timer and OK button simultaneously for 2 seconds. "CLR" appears for 3 seconds and all timer settings are canceled. -
Page 20: Setting The Initial Number Of Activating Units For Cascade Systems
Setting the initial number of activating units for Cascade systems Press the Timer and Lock button simultaneously Press the Up or Down button to adjust the number for 2 seconds with the Power off. of units. The number of initial activating water heaters is Press the OK button to save the changes. -
Page 21: Setting The Temperature Of Dhw Storage Tank Usage Mode
Setting the temperature of DHW storage tank usage mode Press the Timer and OK button simultaneously for Press the Up or Down button to adjust the 2 seconds with the Power off to access the DHW temperature differential value by 1. Storage Tank mode. - Page 22 Press the Up or Down button to adjust the value Press the Up or Down button to adjust the value by 1. by 1. Press the OK button to switch to Stop temperature Press the OK button to switch to Operation settings mode.
- Page 23 Press the Up or Down button to adjust the value by 1. Press the OK button to finish the settings and exit the settings. Note • Setting value ranges from 0 to the set temperature. • The actual temperature is calculated as the set values ×...
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Page 24: Additional Features For Cascade Systems
Additional features for Cascade systems Standby feature before On/Off System info on the Slave panel This feature allows the system to stand by until the When the remote controller is connected to the Power is switched to On or Off. wrong panel, its ID is displayed on the LCD display as an error. -
Page 25: About Errors And Icons
About errors and icons Depending on the severity of the issue that is Reset errors causing the error, the water heater will either stop After the problems that are causing the errors are its operation or will only be able to perform basic resolved, press the OK button once and "RST"... -
Page 26: About Scale Warning
About scale warning Scale warning Deactivating the scale alarm When the water heater needs to be cleaned, the Press and hold the OK button for 2 seconds. scale alarm is activated. "RST" is displayed for 3 seconds. Current status and scale alarm code is displayed. You can change the scale warning intervals if desired. -
Page 27: Basic Troubleshooting And Frequently Asked Questions
Reset button on the front panel. ▪ If resetting the water heater and attempting the remedies suggested in the following do not resolve the problem, contact an authorized technician, a licensed professional, or Navien Technical Support at 1-800-519-8794 for service instructions. Problem Possible Cause(s) - Page 28 Problem Possible Cause(s) What to do The water from the hot • Is the cold water inlet filter clean? • Clean the cold water inlet filter. See water faucet is cold or “4.4 Cleaning the Inlet Water Filter and • Is the hot water faucet open wide turns cold and stays cold.
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Page 29: Error Code Guide
Error Code Guide Error Code Reason Self-diagnostic / Action E003 Ignition failure Ensure that the main gas supply valve is open. E004 False flame detection Ensure that the electrical cord is properly grounded. E012 Flame loss • Clean the intake air filter. See the Operation manual. • Ensure that the electrical cord is properly grounded. - Page 30 Error Code Reason Self-diagnostic / Action E060 Abnormal operation: dual venturi Check the Dual Venturi connection. E109 Abnormal operation: fan motor Clean the intake air filter. See the Operation manual. E110 Abnormal air pressure • Ensure that the exhaust pipe is free of obstructions. • Clean the intake air filter.
- Page 31 Error Code Reason Self-diagnostic / Action E441 Hot water inlet2: thermistor open • Check the thermistor. or short. • Replace the thermistor. E445 Abnormal bypass mixing valve. Check the bypass mixing valve. E515 Abnormal operation: controller Check the front panel settings. E517 Abnormal operation: DIP switch Check the settings for Circuit Board DIP Switch (See the...
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