Setting The Operation Mode - Navien NHB-055 Installation & Operation Manual

Display
S R O/R psi
Pri
S
R O/R psi
Pri
S R O/R psi
Pri
S R O/R
psi
Pri
S
R O/R psi
Pri
S R O/R psi
Pri
To exit service information mode, press the Reset button.
58 Operating the Boiler
Description
DHW pump status
Overheating sensing (HTL) status
Dual venturi status
Low water cut-off (LWCO) status
Air handler interface output
DHW priority status

9.5 Setting the Operation Mode

1. On the Front Panel, press and hold the Diagnostics Button for
over 5 seconds until "1.PAR" is displayed.
2. Press the + (Up) button two times to change the display to
"3.OPR".
3. Press the Mode button once to access the Operation Mode
menu.
4. To set the boiler to operate at 1-stage MIN, press the + (Up)
button until "MIN1" is displayed.
5. To set the boiler to operate at 2-stage MAX, press the + (Up)
button until "MAX2" is displayed.
6. To exit the Operation mode setting and return the boiler to
normal operation, press the Reset button twice.
MODE