Navien NFB-301C User Manual

WARNING
If the information in these instructions is not followed exactly, a re or explosion may result, causing
property damage, personal injury, or death.
Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other
appliance.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electrical switch; do not use any phone in your building.
Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
If you cannot reach your gas supplier, call the re department.
Installation and service must be performed by a qualied installer, service agency or the gas
supplier.
The installation must conform with local codes or, in the absence of local codes, the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Code.
Keep this manual near this boiler for future
reference whenever maintenance or service
is required.
Installation & Operation Manual
NFB Condensing Boilers
Model
NFB-301C
NFB-399C

Navien NFB-301C Specifications

General

Category	Boiler
Fuel Type	Natural Gas / Propane
Min. Input	30, 000 BTU/h
AFUE	95%
Gas Connection Size	3/4" NPT
Control Type	Digital
Heat Exchanger Material	Stainless Steel
Water Connection Size	1
Vent Size	3
Vent Material	PVC/CPVC
Warranty	15 years

Summary

2. Installing the Boiler

2.2 Choosing an Installation Location

Guidelines for selecting a safe and appropriate location for boiler installation.

3. Installing the System Piping

3.1 Installing a Space Heating System

Details on connecting the boiler for space heating system installation.

3.2 Connecting the Condensate Drain

Procedures for properly connecting the boiler's condensate drain line.

4. Connecting the Gas Supply

4.2 Measuring the Inlet Gas Pressure

Procedure for measuring and verifying the boiler's inlet gas pressure.

5. Venting the Boiler

7. Connecting the Power Supply

10. Installation Checklist

11. Operating the Boiler

11.2 Adjusting the Temperature

How to adjust space heating and DHW temperatures on the boiler.

11.5.2 Setting the Space Heating Operation

11.5.3 Setting the DHW Operation (Indirect)

11.7 Understanding Error Codes

Explains error codes and their potential remedies for troubleshooting.

12. Appendixes

12.1 Gas & High Altitude Conversion

Instructions for converting the boiler for different gas types or altitudes.