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General| Category | Boiler |
|---|---|
| Brand | Navien |
| Model | NFB-399C |
| Efficiency | 95% AFUE |
| Gas Connection Size | 3/4" NPT |
| Voltage | 120V |
| Type | Condensing |
| Fuel Type | Natural Gas / Propane |
| Water Connection Size | 1 inch |
| Vent Size | 3 inch / 4 inch |
Lists all items found in the boiler packaging for installation.
Lists optional accessories available for purchase for the boiler.
Provides detailed technical specifications for the boiler models.
Identifies and illustrates the key internal components of the boiler.
Shows the physical dimensions and supply connection points of the boiler.
Explains the information found on the boiler's rating plate for installation.
Step-by-step instructions for safely removing the boiler from its shipping pallet.
Guidelines and factors to consider when selecting a suitable installation location.
Procedures for securely mounting the boiler unit to various wall types.
Instructions for connecting the boiler to a space heating system.
Key guidelines for safe and proper installation of a boiler heating system.
Steps for correctly connecting the boiler's condensate drain line and trap.
Procedure for filling the boiler and system with water and purging air.
Instructions for performing a leak test and ensuring water chemistry meets requirements.
Guidelines for applying the boiler in various system configurations like heating or DHW.
Wiring diagrams and guidelines for connecting external devices and systems.
Details on connecting various external devices like thermostats and sensors to the boiler.
Tables providing guidance on selecting the correct gas pipe size based on length and capacity.
Procedure for measuring and ensuring correct inlet gas pressure for boiler operation.
Guidance on choosing the appropriate vent type and materials for the boiler.
Information on approved vent pipe materials for US and Canadian installations.
How to calculate maximum vent length considering elbows and pipe size.
Examples and guidelines for proper vent termination configurations.
Instructions for accessing and cleaning or replacing the internal air filter.
Configuration of DIP Switch 1 for operation status and model settings.
Configuration of DIP Switch 2 for gas type, country, and thermostat settings.
Examples and considerations for connecting multiple boilers in a cascade system.
Instructions for connecting communication cables for cascade system operation.
Explains the common vent system benefits and essential installation guidelines.
Covers starting the system, damper assembly, pipe connections, and termination.
Configuring system setup, termination clearances, condensate drain, and exhaust clearances.
Procedures for inspecting and maintaining the Navien backflow damper.
Steps for powering the boiler on and off and initial setup.
How to adjust space heating and DHW supply temperatures via the control panel.
Explains operating status displays, error codes, and how to view history.
Navigating basic menus for viewing info, setting temp, DHW, BMS, schedules, and general options.
Accessing advanced service info, input/output status, parameters, external connections, and system diagnostics.
Setting special operation modes and performing air purge functions.
Instructions for converting the boiler for propane gas or high altitude installations.
Detailed wiring diagrams for the boiler and its connections.
Visual representation of the boiler's control logic and component interconnections.
Guidelines for installing the outdoor temperature sensor for optimal performance.
How to configure outdoor reset control for energy efficiency.
Exploded views and part numbers for boiler components.
