Power Supply Unit Board; Electronics Board; Optolink/Override Switch Board - Viessmann VITOTRONIC 100 GC1 Installation And Service Instructions Manual

Additional information
System Components
Power supply unit board, 120 VAC Part No. 7823 991
Electronics board, Part No. 7828 193
Optolink/override switch board, Part No. 7820 165
110
(continued)
The circuit board contains:
Operating status indicator
Fault indicator
Optolink laptop interface
Override switch
The power supply unit board contains
the low-voltage supply for the entire
electronics.
The board contains the microprocessor
with the software.
When replacing the board:
1. Make a note of codings and settings
on the control unit.
2. Replace the board.
3. Set coding "8A:176" and set
cod-ing address "92" (not listed in
the overview) to "92:160".
Override switch for flue gas
measurements with the boiler operated
with constant boiler water temperature
for a short time.
The following functions are triggered in
the "h" setting:
The burner is switched on
(this can be delayed if the system
incorporates a fuel preheater or flue
gas damper)
All pumps are switched on
The boiler water temperature is
controlled by the adjustable high limit
"R".