Navien NPE-240A Service Manual

H2Air+
+
167
Outdoor Reset Control (P07–P10)
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 H2Air+
+
system 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..
Outdoor Low Temperature Set-point (P.07)
To change the outdoor low temperature set-point:
1. In the Parameter information time mode, use the Up (+) or
Down (-) buttons to select P.07. Then, press the Info button to
enter the Outdoor low temperature set-point mode.
2. In the Outdoor low temperature set-point mode, use the Up
(+) or Down (-) buttons to change the value and press the Info
button to set to the desired mode.
Item Description Display
Outdoor low
temperature
set-point
●
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)]
Unavailable
Outdoor reset is OFF (DIP
switch #1 ‘ON’)
NOTE
●
If no buttons are pressed for 10 seconds or if the Info
button is pressed, the current parameter value will be saved
automatically.
●
To return to the <PARAMETER INFORMATION MENU MODE>,
press the [Reset] button once.
●
If no buttons are pressed for five minutes, the display will
automatically return to the <PARAMETER INFORMATION
MENU MODE>.

Navien NPE-240A Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
Energy Factor	0.97
Energy Efficiency	97%
Voltage	120V
Ignition Type	Electronic
Maximum Input	199, 900 BTU/h
Water Connection Size	3/4"
Gas Connection Size	3/4"
Warranty	15-year on heat exchangers, 5-year on parts, 1-year on labor
Dimensions	17.3" W x 13.2" D x 27.4" H