Configuring The Npe-180A/240A Water Heater - Navien NPE-180A Service Manual

NOTE
Install a spring check valve for vertical pipe runs. Do not use
●
a swing check valve with vertical piping.
Install either a spring check valve or a swing check valve for
●
a horizontal run.
An outdoor sensor and a flow switch are supplied with the
●
product.
Use 18 AWG wires for thermostat installation.
●
Install certified mixing valves and expansion tanks ONLY.
●
10.4.2 DHW Priority Options
Refer to the following options to configure the system's DHW
supply modes.
DHW Priority Mode
When the system is configured for the DHW priority mode, space
heating does not operate if there is DHW demand (the flow switch
is 'closed').
Set the DIP switch (SW) #2 to 'Off' to configure the
ON
system to operate in the DHW priority mode.
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Simultaneous DHW and Space Heating Mode
When the system is configured for simultaneous DHW and Space
heating mode, both DHW and space heating will be supplied at
the same time. However, when DHW demand becomes high, the
system automatically turns off the space heating. The system will
continue in this mode until it determines that DHW demand has
reduced from high demand to moderate or low demand.* Please
see appendix for water heater performance specifications.
* The system determines that DHW demand is high and stops supplying
the space heating when: - the water heater is running at or above 85% of
its maximum capacity.
Set the DIP switch (SW) #2 to 'On' to configure the
ON
system to operate DHW and space heating mode
simultaneously.
1 2 3 4
164 NPE Service Manual
10.5 Configuring the NPE-180A/240A
Water Heater
This section provides information required to properly configure
the NPE-180A/240A water heater to setup and utilize the functions
provided by the H2Air+ add-on controller.
+
10.5.1 Entering the Service Information
Mode
Follow the instructions below to access the Service information
mode.
1. At <Normal operation mode>, press the [Diagnostic] button
once to access the service information screen.
2. If you press the [+] / [-] button, the value for the selected
item is increased or decreased. Then, the adjusted value is
displayed.
3. The currently-selected information data item is identified
with an alphabet character prefix followed by 3 digits of the
relevant data.
4. Press the [Reset] button once to return to <Normal operation
mode>.
NOTE
If no buttons are pressed for 1 hour, then it automatically
returns to the <Normal operation mode>.
Item Description
Displays
(T) Outdoor current
temperature outdoor
temperature
Displays
(U) Heating the heating
temperature temperature
based on based on
the outdoor the current
temperature outdoor
temperature
Display
Outdoor
reset OFF
(Dip switch
#1 'ON')
Outdoor
reset
On(Dip
switch #1
'OFF') eg.)
50°F
Outdoor
reset OFF
(Dip switch
#1 'ON')
Outdoor
reset
On(Dip
switch #1
'OFF') eg.)
120°F
Version 2.21