Replacement Of Circuit Board Vr20 - Viessmann VITODENS 200 Start-Up And Service Instructions

Replacement of Circuit Board VR20

IMPORTANT
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.
Coding information
Please note!
This table does not reflect all necessary coding changes required for proper operation of the boiler.
See subsection "Overview of coding addresses" in this manual for other coding changes required.
Coding address Possible coding values
000: 000:
015:
017:
0B8:
000 (without DHW; factory default setting) 000 (without DHW; factory default setting)
001(factory default setting)
001(factory default setting)
000 (no DHW storage tank)
001 (with DHW storage tank) 001 (with DHW storage tank)
002 (with DHW storage tank optimized)
006 not assigned
Additional Information
Removing circuit board VR20
1. Loosen the two screws located
underneath the control
carefully fold down the control.
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.
Ensure that circuit board is fully
plugged in and makes positive
contact.
2. Reinstall front enclosure panel and
cosmetic piping cover.
3. Verify that all coding addresses and
their values are programmed to
recorded actual/required values.
See table below.
4. Turn on power supply to boiler and
start up boiler.
Required action
Set according to system lay- Set according to system lay
out. See page 52 for details.
Do not change!
Do not change!
Set to (one of) the value(s)
indicated. indicated.
and
.
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