Replacement Of Circuit Board Vr20 - Viessmann Vitodens 200 Start-Up/Service Instructions

Vitodens 200 WB2 Service

Replacement of Circuit Board VR20

Coding address Possible coding values
WB2 6-24C
000: 001 (with DHW; factory default setting)
015: 000
017: 001
0B8: 006 (not assigned; factory default setting)
005
Before replacing circuit board VR20, record actual system
addresses (in particular coding addresses 000, 0B8, 042,
045, 015, 017, 0A2) and their corresponding values,
heating curves and DHW settings.
Removing circuit board VR20
1. Loosen the two screws located underneath the
2. Unscrew and remove cover.
3. Slide out circuit board VR20 using supplied handle.
Installing the replacement circuit board
1. Slide circuit board VR20 back into the control.
2. Reinstall front enclosure panel and cosmetic piping
3. Verify that all coding addresses and their values are
4. Turn on power supply to boiler and start up boiler.
Coding information
Note: This table does not reflect all necessary coding
WB2 6-24, 8-32
000 (no DHW storage tank)
001 (with DHW storage tank)
002 (with DHW storage tank optimized)
Additional Information
control and carefully fold down the control.
Ensure that circuit board is fully plugged in and
makes positive contact.
cover.
programmed to recorded actual/required values.
See table below.
changes required for proper operation of the boiler.
See subsection "Overview of coding addresses"
in this manual for other coding changes required.
Required action
Set according to system layout.
See page 48 for details.
Do not change!
Do not change!
Set to (one of) the value(s) indicated.
69