Operating The Boiler; Turning The Boiler On Or Off; Adjusting The System Temperatures - Navien NFB-175H User's Information Manual

3. Operating the Boiler

WARNING
Follow the instructions below to avoid unsafe operating conditions that could cause property damage, severe
personal injury, or death.
Ensure that the boiler is filled with water before turning it on.
●
If overheating occurs or the gas supply fails to shut off, shut off the gas supply to the boiler by using the
●
manual gas valve.
If any part of the boiler has been submerged in water, do not use this appliance and immediately call a
●
qualified service technician. The boiler must be replaced.

3.1 Turning the Boiler On or Off

To turn the boiler on or off, press the Power button (
When the power is on, the boiler automatically enters normal operation mode, and the boiler's operating
conditions are displayed on the screen.
The boiler status icons remain displayed when the boiler is turned off.
Note

3.2 Adjusting the System Temperatures

In normal operation mode, space heating teperature for each zone can be set depending on the settings in the
following table.
Zone Priority Settings
Disable
Enable
Enable
Enable
Settings
Zone Settings
N/A
Zone Pump System
Zone Pump System
Zone Valve System DHW Pump (Default)
).
Pump 1 Settings
N/A Space heating temperature settings
Space heating temperature settings
DHW Pump for Zone 2 and Zone 3 (Pump 1
Settings" is set to "DHW Pump".)
Space heating temperature settings
Zone1 Pump
for Zone 1, Zone 2 and Zone 3
Space heating temperature settings
for Zone 1, Zone 2 and Zone 3
Space heating settings
Operating the Boiler 9