Navien NHB-055, Service Manual

Page: 49 / 147

NHB Service Manual 49 Version 1.0
(1) Parameter setting Mode
1. When [+] / [-] buttons are operated at <Special Parameter mode> and if 1 PAR item is indicated at the segment, at one time pressing of
[Mode] button, then it is entered into <Password input mode>.
2. After entering into, ‘PASS’ is indicated and if [Mode] button is pressed to input entry secret number, it is changed to Password input screen
[“0000”] and first digit number flickers every 500 ms.
3. Secret number is input and it is entered into <Parameter indicating mode>. Whenever [Diagnostic] button is pressed, the input digit
number of secret numbers is changed.
4. Whenever [+] / [-] buttons are pressed, PARAMETER Setting Data items are increased and decreased and indicated.
5. Current PARAMETER Setting Data item is indicated as alphabetical numbering in the first segment and relevant DATA value is indicated at
the 2
nd
, 3
rd
and 4
th
segments. (Alphabetical numbering A ~ Z are indicated and next ones are indicated as 1 ~ 9, then those after that are
indicated as symbols.)
6. At one time pressing of [Reset] button, it returns to <Special Parameter mode> and even if there are no inputs of [+] / [-] buttons for 5
minutes, it returns to <Special Parameter mode>.
7. In desiring to change Parameter values, press [Mode] button and convert to <Parameter change mode>. A 4-digit segment flickers every
500 ms.
8. At <Parameter change mode>, whenever [+] / [-] buttons are pressed, it changes Parameter values.
9. If [Mode] button is pressed or button is not pressed for 10 seconds, a finally-set value is applied, <Parameter change mode> is terminated
and it returns to <Parameter indicating mode>.
10. If [Reset] button is pressed for more than 5 seconds in the state each Parameter is changed, each Parameter is initialized. If [Mode] button
is pressed or the button is not pressed for 10 seconds, initialized set value is applied, it terminates <Parameter Change mode> and returns
to <Parameter indicating mode>.
11. If [Reset] button is pressed during <Parameter change mode>, it does not save value of PARAMETER, but returns to <Parameter indicating
mode>.
12. If one parameter of lowest / highest outdoor temperatures is initialized, then remaining parameters are initialized.(If either of Supply
Absolute MIN / MAX Set-point, Return Absolute MIN / MAX Set-point is initialized, then remaining parameter is initialized.)
13. If [+] / [-] buttons are not pressed for 5 minutes at <Parameter indicating mode>, then it changes to <Special Parameter mode>. (To
indicating item 1.PAR incoming before.)
14. If DIP SW No. 2 (setting temperature unit) is changed from Celsius=> Fahrenheit or Fahrenheit => Celsius, error of about 1°F (0.5°C) can
occur.
15. To make prior model (NCB) and menu be the same, the function existing only at prior model is indicated as [Al “---“] and the
relevant item cannot enter into <Parameter change mode>.
* NHB panel gets functions from main controller, so if communication is not made, all functions are indicated as they not being.