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Navien NR-21DU Manual

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NR-21DU

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Summary of Contents for Navien NR-21DU

  • Page 1 NR-21DU...

  • Page 2: Table Of Contents

    Safety Instructions Included Items Connecting the Extension Cable Attaching the Wall Mounting Bracket Remote Controller LCD Display Icons Multi Remote Controller System Turning the Controller On or O Setting the water temperature Entering High Temperature Mode (Commercial Mode) Entering Lock Mode Starting Recirculation Setting the clock Setting the Recirculation timer...

  • Page 3: Safety Instructions

    Safety Instructions The following safety symbols are used in this manual. Read and follow all safety instructions in this manual precisely to avoid unsafe operating conditions, re, explosion, property damage, personal injury, or death. Keep this manual for future reference. Indicates an imminently hazardous situation which, if not avoided, could result in severe...

  • Page 4: Included Items

    Included Items When you open the box, you will nd 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 Multi Remote Controller Cable Wall Mounting Bracket (optional)

  • Page 5: Connecting The Extension Cable

    Connecting the Extension Cable 1. Connect one end of the extension cable to the 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.

  • Page 6: Attaching The Wall Mounting Bracket

    Attaching the Wall Mounting Bracket 1. A x 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.

  • Page 7: Remote Controller

    Remote Controller LCD display LED indicator Indicates functions and Indicates the status of water current status. heater. - Green: Normal Mode. - Red: Error occurred. Preheat&Timer button Lock button -Access the timer settings. Locks the other button -Recirculation ON. operations. Up button Power button Increase the temperature...

  • Page 8: Lcd Display Icons

    LCD Display Icons Timer is set. 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.

  • Page 9: Multi Remote Controller System

    Multi Remote Controller System...
  • Page 10 Multi Remote Controller System...
  • Page 11 Multi Remote Controller System...
  • Page 12 Multi Remote Controller System...
  • Page 13 Multi Remote Controller System...

  • Page 14: Turning The Controller On Or O

    Turning the Controller On or O To turn the controller on or o , press the Power button. When the power is on, The LCD display turns on. The LED indicator turns green. Hot water temperature is displayed. When an error occurs, the LED Note indicator turns RED and blinks (except for Cascade mode).

  • Page 15: Setting The Water Temperature

    Setting the water temperature The Range of temperature settings is di erent depending on the Water Heaters. Range : 98 ~ 140°F (36~60°C) NPN Non-Condensing Water Heaters Range : 98 ~ 140°F (36 ~ 60°C) NPE-A2/S2 Condensing Water Heaters Range : 97 ~ 140°F (36 ~ 60°C) Press the Up or Down button to adjust the temperature.

  • Page 16: Entering High Temperature Mode (Commercial Mode)

    Entering High Temperature Mode (Commercial Mode) Press and hold the Up and Down button Press the Up button to increase the temperature by simultaneously for 10 seconds. 1°F(0.5°C), and press the Down button to decrease the temperature by 1°F(0.5°C) When this mode is available, "HIGH" appears for 3 seconds.

  • Page 17: Entering Lock Mode

    Entering Lock Mode To prevent accidental pressing of the buttons and to prevent children from adjusting the controller, you can activate the Temperature Lock Mode. To activate or deactivate Lock Mode, press the Lock button for 2 seconds. When Lock Mode is activated, •...

  • Page 18: Starting Recirculation

    Starting Recirculation During the recirculation, when NPN Non-condensing water heaters are connected, The preheating icon ashes continuously. when NPE-A2/S2 condensing water heaters are connected, The preheating icon keeps turning on.

  • Page 19: Setting The Clock

    Setting the clock Press the Timer button for 2 Seconds. Adjust the minutes by pressing the Up or Down Button. Press the OK button to set the minutes. Note Setting the clock is available only when NPN Non-condensing water heaters are connected.
  • Page 20 Once the minutes are set, adjust the hour by Press the OK button to nish and save the updated pressing the Up or Down button. time.

  • Page 21: 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. Setting the Recirculation Timer is available The recirculation timer settings are Note...
  • Page 22 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 23 During the reservation schedule, the preheating icon turns on and the Reservation area starts ashing.

  • Page 24: 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. Note Canceling all timer settings is available only when NPN Non-condensing water heaters are connected.

  • Page 25: Additional Features For Cascade Systems

    Additional features for Cascade systems Standby feature before On/O 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 O . wrong panel, its ID is displayed on the LCD display as an error.

  • Page 26: 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 27: 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 28: 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 29 Problem Possible Cause(s) What to do The water from the hot Is the cold water inlet lter clean? Clean the cold water inlet lter. 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.

  • Page 30: 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 ame detection Ensure that the electrical cord is properly grounded. E012 Flame loss Clean the intake air lter. See the Operation manual. Ensure that the electrical cord is properly grounded.
  • Page 31 Error Code Reason Self-diagnostic / Action E060 Abnormal operation: dual venturi Contact Technical Support at 1-800-519-8794. E109 Abnormal operation: fan motor Clean the intake air lter. See the Operation manual. E110 Abnormal air pressure Ensure that the exhaust pipe is free of obstructions. Clean the intake air lter.
  • Page 32 Error Code Reason Self-diagnostic / Action E441 Hot water inlet2: thermistor open Contact Technical Support at 1-800-519-8794. or short. E515 Abnormal operation: controller Check the front panel settings. E517 Abnormal operation: DIP switch Check the settings for Circuit Board DIP Switch (See the setting Installation manual).
  • Page 33 Memo...
  • Page 34 Memo...
  • Page 35 Memo...
  • Page 36 Navien America Inc. 20 Goodyear lrvine, CA 92618, TEL : 949-420-0420, FAX : 949-420-0420 1-800-519-8794...

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