Navien NFB-301C User Manual

100 Operating the Boiler
Item Description
1. SH1 Thermostat
Input
Space heating thermostat 1 input
status
2. SH2 Thermostat
Input
Space heating thermostat 2 input
status
3. SH3 Thermostat
Input
Space heating thermostat 3 input
status
4. DHW Thermostat
Input
DHW thermostat 1 input status
5. Boiler Pump
Output
Boiler pump output status
6. Zone1 Pump
Output
Zone 1 pump output status
7. Zone2 Pump
Output
Zone 2 pump output status
8. Zone3 Pump
Output
Zone 3 pump output status
9. HTL Input HTL input status
10. Dual Venturi
Output
Dual Venturi output status
11. LWCO Input LWCO input status
12. Air Handler
Output
Air Handler Interface output status
13. DHW Priority
Output
DHW priority output status
Item Description
8. Δ T Limit - No. of
times
Number of times supply return
temperature limit control has activated
9. Supply Limit - No.
of times
Number of times Recirculation supply
temperature limit control has activated
10. Δ T High - No. of
times
Number of times combustion stopped
due to supply return temperature
11.6.2 Viewing Input and Output Status
To view the boiler’s input and output status:
1. Tap the Set button ( ) > Service.
2. Tap Open on the In/Out Status menu.

Navien NFB-301C Specifications

General

Brand	Navien
Model	NFB-301C
Category	Boiler
Language	English