Navien NPE Installation & Operation Manual page 66

Outdoor Reset Control (P.07–P.10)
The Outdoor Reset Control feature can be used to enhance energy
efficiency while maintaining optimal heating performance.
Outdoor Reset Control automatically changes the space heating
temperature setting based on the outdoor temperature and the
current space heating system application (system load).
To achieve optimal heating performance, configure the following
set-points: the Outdoor Low Temperature, the Outdoor High
Temperature, the heating MIN and the heating MAX Set-point
configuration must be based on the ComfortAir
characteristics and installation environment.
Refer to the following examples in the graph to configure the
Outdoor Reset Control feature.
* The graph above is an example of a few possible outdoor reset parameter
settings. For more information about settings, refer to the following
information.
* If the Outdoor Reset On (DIP switch #1 OFF) is set and the outdoor
temperature sensor is not connected, or the outdoor temperature sensor
value is outside the normal range, the '740' error message is displayed and
the system operates the same way as with the Outdoor Reset OFF (DIP
switch #1 ON) setting.
66 Operating the Water Heater
Outdoor Low Temperature Set-point (P.07)
Item
Outdoor low
temperature
set-point
+
system
Unavailable
Outdoor High Temperature Set-point (P.08)
Item
Outdoor
high
temperature
set-point
Unavailable
Heating MIN Set-point (P.09)
Item
Heating MIN
set-point
Unavailable
Description
Sets the outdoor low
temperature set-point
when outdoor reset is ON
(DIP switch #1 'OFF')
(Default: 14°F (-10°C))
Range: -4°F (-20°C) – 59°F
(15°C)
Cannot be greater than the
[Outdoor high temperature
set-point -9°F (5°C)]
Outdoor reset is OFF (DIP
switch #1 'ON')
Description
Sets the outdoor high
temperature set-point when
outdoor reset is ON
(DIP switch #1 'OFF')
(Default: 70°F (21°C))
Range: 5°F (-15°C) – 104°F
(40°C)
Cannot be lower than the
[Outdoor low temperature
set-point + 9°F (5°C)]
Outdoor reset is OFF (DIP
switch #1 'ON')
Description
Sets the Heating MIN set-
point when outdoor reset
is ON (DIP switch #1 'OFF')
(Default: 100°F (37.5°C))
Range: 100°F (37.5°C) –
140°F (60°C)
Cannot be greater than the
[CH MAX set-point - 36°F
(20°C)]
Outdoor reset is OFF (DIP
switch #1 'ON')
Display
Display
Display