Navien NFB-175H, Installation Manual, Page: 107 / 135

107 Operating the Boiler
Item Description
10. Zone V/V 2
Status
Zone 2 valve output
status
11. Zone V/V 3
Status
Zone 3 valve output
status
12. HTL Input Status HTL input status
13. Dual Venturi
Status
Dual Venturi output status
14. LWCO Input
Status
LWCO input status
15. Air Handler
Interface Output
Status
Air Handler Interface
output status
16. DHW Priority
Output Status
DHW priority output
status
11.6.3 Setting the Operation
Parameters
To set the boiler’s operation parameters, press the
Back button ( ) and the Menu button ( )
simultaneously for 3 seconds, and then select
“3. Parameter Settings”.
CAUTION
Parameters must be set by a qualified
professional with an extensive understanding
of the boiler system. Setting parameters
improperly may lead to property damage or
injury.
11.6.2 Viewing Input and Output Status
To view the boiler’s input and output status, press
the Back button ( ) and the Menu button ( )
simultaneously for 3 seconds, and then select
“2. Input/Output Status”.
Rotate the Command dial ( ) to switch between
the information items. Press the Command dial ( )
to select an item and view the information.
Press the Back button ( ) to return to the previous
screen or menu.
Item Description
1. SH1 Thermostat
Status
Space heating thermostat
1 input status
2. SH2 Thermostat
Status
Space heating thermostat
2 input status
3. SH3 Thermostat
Status
Space heating thermostat
3 input status
4. DHW Thermostat
Status
DHW thermostat 1 input
status
5. Boiler Pump
Status
Boiler pump output status
6. DHW/Zone1
Pump Status
DHW / Zone 1 pump
output status
7. Zone2 Pump
Status
Zone 2 pump output
status
8. system/Zone3
Pump Status
System / Zone 3 pump
output status
9. Zone V/V 1 Status
Zone 1 valve output
status