Navien NR-20DU User manual

www.NavienAmerica.com
BG-E-MU-10-01
20024184A
Navien America Inc.
20 Goodyear, Irvine, CA 92618, TEL : [phone], FAX : [phone]
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Keep this manual near this remote controller
for future reference whenever maintenance or
service is required.
NR-20DU
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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
Setting the clock 13
Setting the Recirculation timer 15
Canceling all timer settings 18
Setting the initial number of activating units for Cascade systems 19
Setting the temperature of DHW storage tank usage mode 20
Additional features for Cascade systems 23
About errors and icons 24
About scale warning 25
Basic Troubleshooting and Frequently Asked Questions 26
Error Code Guide 28
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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 these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or loss of life.
Indicates an imminently
hazardous situation which, if not
avoided, could result in severe
injury or death.
Indicates a potential hazardous
situation which, if not avoided,
may result in injury or death.
Indicates a potentially
hazardous situation that, if not
avoided, could result in property
damage.
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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
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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.
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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.
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7
Remote Controller
LCD display
Indicates functions and
current status.
LEDindicator
Indicates the status of water
heater.
- Green: Normal Mode.
- Red: Erroroccurred.
Timer button
Access the timer settings.
Up button
Increase the temperature
or value.
Down button
Decrease the temperature
or value.
Lock button
Locks the other button
operations.
Power button
Turns the remote controller
OK button
on or o.
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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.
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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 Cascade mode).
• The backlight stays on for 8 seconds
when a button is pressed.
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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. The temperature changes by 1°F
(0.5°C).
Level 2: 120~140°F (50~60°C)
• Press and hold the Up button for 2 seconds to
increase the temperature by 5°F (2°C).
• Press the Down button to decrease the
temperature by 5°F (2°C).
• To save the temperature setting, press the OK
button.
Note • For temperatures higher than 140°F
(60°C), check the High temperature
mode in the next section.
• The settings are automatically saved
when you do not press any buttons for
5 seconds.
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11
Entering High Temperature Mode (Commercial Mode)
1
10 sec
2
5sec
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
burns, check the set temperature before
using hot water.
Press the Up button for 5 seconds to increase the
temperature by 10°F (5°C), and press the Down
button to decrease the temperature by 10°F (5°C).
Note • Commercial Warranty applies when this
mode is used. Refer to the Warranty in
the Operation manual for more details.
• Commercial mode is only available for
select models. Refer to the Operation
Manual supplied with the water heater.
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12
Entering Lock Mode
2sec
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 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.
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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.
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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.
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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 timer settings are
divided in 30 minute increments.

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.

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.

18
Canceling all timer settings
2sec
Press and hold the Timer and OK button
simultaneously for 2 seconds.
"CLR" appears for 3 seconds and all timer settings
are canceled.

19
Setting the initial number of activating units for Cascade systems
1
2sec
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 Down button to adjust the number
of units.
Press the OK button to save the changes.
Note When you do not press the OK button for
10 seconds, the changes will not be saved.