Navien NR-21DU User manual

NR-21DU

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
9Multi Remote Controller System
Turning the Controller On or O
Setting the water temperature
14
Starting Recirculation
15
Entering High Temperature Mode (Commercial Mode) 16
Entering Lock Mode 17
Setting the clock
18
Setting the Recirculation timer
19
Canceling all timer settings
21
24
25Additional features for Cascade systems
28
About errors and icons
30
26
27About scale warning
Basic Troubleshooting and Frequently Asked Questions
Error Code Guide
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.
If you do not follow these instructions exactly, a re
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.

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
9Multi Remote Controller System
Turning the Controller On or O
Setting the water temperature
14
Starting Recirculation
15
Entering High Temperature Mode (Commercial Mode) 16
Entering Lock Mode 17
Setting the clock
18
Setting the Recirculation timer
19
Canceling all timer settings
21
24
25Additional features for Cascade systems
28
About errors and icons
30
26
27About scale warning
Basic Troubleshooting and Frequently Asked Questions
Error Code Guide
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.
If you do not follow these instructions exactly, a re
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.
3

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
(optional)
Wall Mounting Bracket
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.
You can connect up to 2 remote controllers if
necessary.(Optional)
Note
4

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
(optional)
Wall Mounting Bracket
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.
You can connect up to 2 remote controllers if
necessary.(Optional)
Note
5

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.
Remote Controller
LCD display
Indicates functions and
currentstatus.
LED indicator
Indicates the status of water
heater.
- Green: Normal Mode.
- Red: Error occurred.
Preheat&Timer button
-Access thetimersettings.
-Recirculation ON.
Up button
Increasethetemperature
or value.
Downbutton
Decreasethe temperature
or value.
Lockbutton
Locks the other button
operations.
Power button
Turns the remote controller
OK button
6

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.
Remote Controller
LCD display
Indicates functions and
currentstatus.
LED indicator
Indicates the status of water
heater.
- Green: Normal Mode.
- Red: Error occurred.
Preheat&Timer button
-Access thetimersettings.
-Recirculation ON.
Up button
Increasethetemperature
or value.
Downbutton
Decreasethe temperature
or value.
Lockbutton
Locks the other button
operations.
Power button
Turns the remote controller
OK button
7

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.
8
Multi Remote Controller System

9
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.
Multi Remote Controller System
9

10
Multi Remote Controller System
Multi Remote Controller System
10