Setting The Parameters - Navien NHB-055 Installation & Operation Manual

11.6 Setting the Parameters

You can modify parameter settings for boiler operations, such
as the space heating and DHW temperature ranges, in different
operating conditions. 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 boiler system. Setting
parameters improperly may lead to property damage or injury.
1. Press and hold the Diagnostic button for 5 seconds to enter
the Special Parameter mode.
2. Press the + or – buttons to move to "1.PAR" (Parameter Setting
mode), and then press the Mode button. You will be asked
to enter a password ("PASS" is displayed). The factory default
password is "1234".
3. Press the Mode button and enter your 4-digit password. Use
the + or – buttons to increase or decrease numbers and the
Diagnostic button to move between digits.
4. When you are finished, press the Mode button.
5. Press the + or – buttons to move to a parameter setting, and
then press the Mode button to enter the Parameter Edit mode.
6. Press the + or – buttons to change the parameter value.
7. When you are finished, press the Mode button to save the
settings.
8. To exit the Special Parameter mode, press the Reset button
twice.
78 Operating the Boiler
MODE O O
If you enter an incorrect password 10 times or make
Note
no inputs 5 minutes, the boiler will return to Normal
mode.
To return to the previous mode, press the Reset
button.
The Factory default password is "1234".
If you make no inputs for 10 seconds in the
Parameter Edit mode, the current parameter value
will be saved automatically.
Press and hold the Reset button in Parameter Edit
mode for 5 seconds to reset individual parameters to
their default values.
When you reset one of the following parameters, the
corresponding parameter will be reset automatically:
- Supply absolute MIN or MAX
- Return absolute MIN or MAX
- Lowest Outdoor Temperature or Highest Outdoor
Temperature
Configuring the Outdoor Reset Control Mode
Display
Outdoor Reset enabled
S R O/R psi
Outdoor Reset disabled
S psi
R O/R
This mode is used to configure the Outdoor Reset Control mode.
This mode is enabled by default from the factory.
CAUTION
An outdoor sensor error may occur if the Outdoor Reset
Control mode is enabled without the outdoor sensor installed
In the Outdoor Reset Control mode, the boiler's water
Note
temperature is regulated according to the outdoor
temperature to maximize boiler efficiency and reduce
energy usage. This mode must remain enabled and
the outdoor sensor must be installed to comply with
federal efficiency regulations. The Outdoor Reset mode
may only be disabled if the boiler is not used for any
space heating.
Description