Viessmann VITOROND 100 VR1 40 Installation And Service Instructions Manual page 21

Connections
Vitorond 100, VR1 40 to 63, 161 to 245 Installation and Service
Safety Connections (with Hydrostat 3250-Plus Control)
(continued)
1. To avoid problems with removing the top panel,
we recommend moving the top panel screw
approximately 3" to the left or right. To do so,
pre-drill the panel with an 1/8" drill bit.
To reinstall the top panel, drill a new 1/8" pilot hole
through the top back panel and into the back panel.
Reinstall the screw P into this new mounting hole.
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