Setting The Parameters - Navien NPE Installation & Operation Manual

6.5 Setting the Parameters

Follow the instructions below to enter the Special Parameter mode
and change parameter settings.
CAUTION
Parameters must be set by a qualified professional with an
extensive understanding of the water heating system. Setting
parameters improperly may lead to property damage or injury.
1. On the front panel, press the Power button to turn off the
water heater.
2. Enter the R&D information menu by pressing the Up [+] button
three times, the Down [-] button three times, and then the Up
[+] button four more times.
3. In the R&D information menu, use the Up [+] or Down [-]
button to move to 2.PAR (Parameter Information mode), and
then press the Information button.
No. Mode
1 Technical Information
2 Parameter Information
4. Press the Up [+] or Down [-] button to move to a parameter
setting, and then press the Information button to enter the
Parameter Edit mode.
5. Use the Up [+] or Down [-] button to change the value and
press the Information button to set the desired mode.
If no buttons are pressed for 10 seconds or if
Note
the Information button is pressed, the current
parameter value will be saved automatically.
To return to the <PARAMETER INFORMATION MENU
MODE>, press the Reset button.
If no buttons are pressed for five minutes,
the display will automatically return to the
<PARAMETER INFORMATION MENU MODE>.
Pump Exercise Operation Time (P.04)
The pump exercise function is designed to prevent the stagnation
of hot water in the heating system.
The pump exercise function operates every 24 hours. Pump
exercise operation time function sets the desired pump exercise
operation time differently depending on the plumbing as well as
environmental conditions.
With this option activated, the NPE-180A/210A/240A water heater
monitors the pump operation. When it detects that a pump
has not been used for a specific period, it runs the pump for a
set duration. If the flow rate is not detected while the pump is
operating, the 'E438' error message is displayed.
Range
1–240 (sec)
Note
Display
Burn Delay Time (P.05)
This function is used to set the burner delay time at an optimal
value for the air handler application. If there is no burner delay
time, the water heater might turn on or off once or twice during
the air handler delay time.
Range
0
1–120 (sec)
Pump Post Purge Time (P.06)
This function is used to set the post purge time after a combustion
cycle is completed.
Range
0
1–120 (sec)
Description
Sets the exercise operation time
(default: 30 sec)
While the pump is excising, the burner will not fire.
Description
Burn delay time unavailable
Sets the pump ON delay time
when the heating is turned on
(default: 30 sec).
Description
Pump post purge time
unavailable
Sets the pump post purge time
when heating stops in a system
(default: 30 sec).
Display
Display
Display
Operating the Water Heater 65