Navien NCB-24LSWE, Service Manual

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NCB Service Manual 55 Version 1.0
Setting Operational Conditions
1. In <Test information mode>, press [+] or [-] until “2. OPR” is displayed on the front panel. Then, press [ECO] once.
2. <Normal operation mode> cannot be accessed if the boiler is in an error condition.
3. When <Normal operation mode> opens, either Summer mode or Winter mode is automatically selected depending on the
season.
4. When [+] or [-] is pressed, it increases or decreases the operational condition values and the value flashes at 500 msec
intervals. If the value is not changed for 3 seconds, the currently displayed value is saved and used.
5. If [Reset] is pressed once, the system returns to <Test information mode>. (The previously entered item at “2. OPR” is
displayed.)
6. If there is no button activity for 3 hours, the system automatically returns to <2. OPR >.
[24K/28K/34K models]
Mode Description Display
(a) NORMAL operational
condition
Operates in Normal operation mode
(b) MIN operational condition Operates in MIN operation mode
(c) CH MAX operational
condition
Operates in CH MAX operation mode
(d) DHW MAX operational
condition
Operates in DHW MAX operation mode
[40K model]
Mode Description Display
(a) NORMAL operational
condition
Operates in Normal operation mode
(b) MIN operational condition
Operates in MIN operation mode
(c) Stage 1 MAX operational
condition
Operates in Stage 1 MAX operation mode
(d) Stage 2 MIN operational
condition
Operates in Stage 2 MIN operation mode
(e) Stage 2 CH MAX operational
condition
Operates in Stage 2 CH MAX operation mode
(f) Stage 2 DHW MAX
operational condition
Operates in Stage 2 DHW MAX operation mode