Navien NHB-055, Service Manual

Page: 54 / 147

54 NHB Service Manual Version 1.0
Item Description Display
(P) Return Absolute
MAX Set-point
This menu may be used to make changes to the maximum return
temperature range the Return Control mode is in use. When configuring the
Custom mode in the Outdoor Reset Control mode, the return temperature
changes based on the return absolute MAX temperature range.
Setting range Default
[MIN Set-point + 18°F(10°C)] ~ 158°F(70°C) 149°F(65°C)
For Celsius (°C) mode;
ex) at 65°C
For Fahrenheit (°F) mode;
ex) at 149°F
(Q) Return Absolute
MIN Set-point
This menu may be used to make changes to the minimum return temperature
range the Return Control mode is in use. When configuring the Custom mode
in the Outdoor Reset Control mode, the return temperature changes based
on the return absolute MIN temperature range.
Setting range Default
68°F(20°C) ~ [MAX Set-point - 18°F(10°C)] 86°F(30°C)
For Celsius (°C) mode;
ex) at 30°C
For Fahrenheit (°F) mode;
ex) at 86°F
(R) Low Water
Pressure Limit
This menu may be used to make changes to low pressure setting of the space
heating system. Low water level error occurs if the water pressure is lower
than the low pressure value.
Setting range Default
4-17 PSI 6 PSI
If water pressure is 6 psi
psi
(U) Zone Controller
Communication
This menu may be used to allow the boiler to work with a zone controller.
Setting range Default
ON / OFF OFF
T-T Zone Controller Connection
(OFF)
Smart Zone / Ready-Link
Connection (ON)
(V) Setting of DHW
Priority Time
Setting of DHW priority time.
Setting range Default
0 ~ 180min 30 min
In case of Time 30min
Pri