Viessmann VITOTRONIC 100 GC1B Service Manual download pdf (Page 110)

Additional information

110

System Components (continued)

Power supply unit board, 120 VAC Part No. 7823 991

The power supply unit board contains

the low-voltage supply for the entire

electronics.

Electronics board, Part No. 7828 193

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”.

Optolink/override switch board, Part No. 7820 165

The circuit board contains:

Operating status indicator

Fault indicator

Optolink laptop interface

Override switch

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”.

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Viessmann VITOTRONIC 100 GC1B Service Manual Page 110