Navien NHB-055 Service Manual page 59

(3) Operation Conditions Settings
1. While in <Special Parameter mode>, press the [+] / [-] button and then press the [Mode] button once when "3. OPR" is displayed on the
front panel.
2. Whenever the [+] / [-] button is pressed, it increases / decreases the operation condition and flashes at intervals of 500msec. If the
condition is not changed for 3 seconds, it works at the displayed operation condition.
a) NORMAL Operation condition
d) 2-Stage MIN → e) DHW 2- Stage MAX
g) CH 2nd Stage MAX
3. If the [Reset] button is pressed once, then it returns to the <Special Parameter mode>. (Displayed as the previously entered item "3. OPR")
4. If there is no button input for 3 hours, then the system automatically returns to the <Normal Operation mode>.
Mode
(a) NORMAL Operation condition
(b) 1st Stage MIN Operation
condition
(c) 1st Stage MAX Operation
condition
(d) 2nd Stage MIN Operation
condition
(e) 2nd Stage MAX Operation
condition
Version 1.0
→ →
b) 1-Stage MIN
→ f) CH 1st Stage MAX
→ a) NORMAL Operation condition) ......
Operated in a Normal operation mode
Operated in a 1-Stage MIN operation mode
Operated in a 1-Stage MAX operation mode
Operated in a 2-Stage MIN operation mode
Operated in a 2-Stage MAX operation mode
→
c) DHW 1-Stage MAX
→
Description Display
NHB Service Manual 59