Navien NPN-120E, User'S Information Manual

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2 Contents
Contents
1. Safety Information 3
2. About the Water Heater 7
2.1 Description of the Water Heater 7
2.2 Parts of the Water Heater 7
2.3 The Front Panel (Indoor Models Only) 8
2.4 Remote Controller (Outdoor Models -
Optional for Indoor Models) 9
3. Operating the Water Heater 10
3.1 Turning the Water Heater On or Off 10
3.2 Adjusting the Water Temperature 11
3.3 Viewing Basic Information (Indoor
Models Only) 12
3.4 Resetting the Water Heater 12
3.5 Entering Lock Mode 13
3.6 Setting the clock 13
3.7 Setting the Recirculation timer 14
3.8 Starting Recirculation 15
3.9 Canceling all timer settings 15
4. Maintaining the Water Heater 16
4.1 Cleaning the Water Heater 16
4.2 Draining the Water Heater 16
4.3 Flushing the Heat Exchanger 17
4.4 Cleaning the Inlet Water Filter 19
4.5 Protecting the Water Heater from Freezing 19
5. Troubleshooting 21
5.1 Solving Basic Problems 21
5.2 Understanding Error Codes 22