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- Remote Control
- NR-20DU
- User Manual
Navien NR-20DU User Manual
Summary of NR-20DU
Page 1
Www.Navienamerica.Com bg-e-mu-10-01 20024184a navien america inc. 20 goodyear, irvine, ca 92618, tel : 949-420-0420, fax : 949-420-0430 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. Nr-20du downloaded from https://gadgetsgo.Com/nr-20du-instant-efficient-hot-heating-boiler-rc.Html.
Page 3
Contents safety instructions 3 included items 4 connecting the extension cable 5 attaching the wall mounting bracket 6 remote controller 7 lcd display icons 8 turning the controller on or off 9 setting the water temperature 10 entering high temperature mode (commercial mode) 11 entering lock mode 12...
Page 4: Safety Instructions
3 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, fire, explosion, property damage, personal injury, or death. Keep this manual for future reference. If you do not follow ...
Page 5: Included Items
4 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-20d...
Page 6
5 connecting the extension cable 1. Connect one end of the extension cable to the port on the front panel of the water heater. 2. Pass the other end of the extension cable through the hole in the bracket. 3. Connect the end of the extension cable to the cable connected to the remote controller. Down...
Page 7
6 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-...
Page 8: Remote Controller
7 remote controller lcd display indicates functions and current status. Led indicator indicates the status of water heater. - green: normal mode. - red: error occurred. Timer button access the timer settings. Up button increase the temperature or value. Down button decrease the temperature or value....
Page 9: Lcd Display Icons
8 lcd display icons timer is set. Recirculation mode. Displays the current time. Hot water is in use. Displays the current set temperature. Water heater operation is in progress. Operations are locked. An error code will appear on the display. Operating in energy saving mode. Downloaded from https:/...
Page 10
9 turning the controller on or off to turn the controller on or off, press the power button. When the power is on, • the lcd display turns on. • the led indicator turns green. • hot water temperature is displayed. Note • when an error occurs, the led indicator turns red and blinks (except for cascad...
Page 11
10 setting the water temperature or setting the water temperature above 125°f (52°c) can cause instant scalding or severe burns. Two levels of temperature settings are available depending on the dip switch settings. Level 1: 98~120°f (36~50°c) • press the up or down button to adjust the temperature....
Page 12
11 entering high temperature mode (commercial mode) 1 10 sec 2 5 sec press and hold the up and down button simultaneously for 10 seconds. • when this mode is available, "high" appears for 3 seconds. • when this mode is unavailable, "low" appears for 3 seconds. To prevent instant scalding or severe b...
Page 13: Entering Lock Mode
12 entering lock mode 2 sec 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, • the lock icon appears ...
Page 14: Setting The Clock
13 setting the clock 1 2 or 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
14 3 4 once the minutes are set, adjust the hour by pressing the up or down button. Press the ok button to finish and save the updated time. Downloaded from https://gadgetsgo.Com/nr-20du-instant-efficient-hot-heating-boiler-rc.Html.
Page 16
15 setting the recirculation timer 1 x 2 2 or press the timer button twice to set the recirculation timer. Reservation schedule #1 is ready to be set. Set the recirculation activation time by pressing the up or down button. Press the ok button to set the deactivation time. Note the recirculation tim...
Page 17
16 3 or 4 set the deactivation time by pressing the up or down button. Press the ok button to save the timer setting. Repeat these procedures for reservation schedule settings #2 and #3..
Page 18
17 5 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..
Page 19: Canceling All Timer Settings
18 canceling all timer settings 2 sec 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
19 setting the initial number of activating units for cascade systems 1 2 sec 2 or press the timer and lock button simultaneously for 2 seconds with the power off. The number of initial activating water heaters is displayed. Note the maximum number of units in a cascade system is 16. Press the up or...
Page 21
20 setting the temperature of dhw storage tank usage mode 1 2 sec 2 or press the timer and ok button simultaneously for 2 seconds with the power off to access the dhw storage tank mode. Cascade on-unit temperature is ready to be set. Note this is not applied when models are set in internal or extern...
Page 22
21 3 or 4 or press the up or down button to adjust the value by 1. Press the ok button to switch to operation temperature settings mode. "s ot" and the corresponding value are displayed on the lcd display. Note setting value ranges from 0 to the set temperature for cascade on unit. Press the up or d...
Page 23
22 5 or 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 × 0.5..
Page 24
23 additional features for cascade systems standby feature before on/off this feature allows the system to stand by until the power is switched to on or off. "wait" is displayed while the entire cascade water heater is powered on or off. System info on the slave panel when the remote controller is c...
Page 25: About Errors and Icons
24 about errors and icons depending on the severity of the issue that is causing the error, the water heater will either stop its operation or will only be able to perform basic operations. A flashing red led and error icon can be seen on the remote controller along with the associated error code. T...
Page 26: About Scale Warning
25 about scale warning scale warning when the water heater needs to be cleaned, the scale alarm is activated. Current status and scale alarm code is displayed. You can change the scale warning intervals if desired. Deactivating the scale alarm press and hold the ok button for 2 seconds. "rst" is dis...
Page 27
26 basic troubleshooting and frequently asked questions ▪ if you experience a problem with the water heater, refer to the following chart for possible remedies. Error codes that appear on the front panel display are explained in the following section. ▪ for minor problems, resetting the water heater...
Page 28
27 problem possible cause(s) what to do the water from the hot water faucet is cold or turns cold and stays cold. • is the cold water inlet filter clean? • is the hot water faucet open wide enough draw at least 0.5 gallons of water per minute (gpm) through the water heater? • is an error code displa...
Page 29: Error Code Guide
28 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 ...
Page 30
29 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 ...
Page 31
30 error code reason self-diagnostic / action e441 hot water inlet2: thermistor open or short. • check the thermistor. • replace the thermistor. E445 abnormal bypass mixing valve. Check the bypass mixing valve. E515 abnormal operation: controller check the front panel settings. E517 abnormal operati...
Page 32: Memo
Memo.