Viessmann SM1 Installation And Service Instructions Manual page 8

Installation sequence
Power supply
(cont.)
Power supply for accessories and external compo-
nents
■ For accessories and external components that will
not be connected to the control unit, we recommend
making the power connection to the same MCB/fuse,
or at the very least in-phase with the control unit.
Connection to the same MCB/fuse provides addi-
■
tional safety when the power is switched off.
Observe the power consumption of the connected
consumers.
Danger
Incorrect core assignment can result in serious
injury and damage to the appliance.
Never interchange cores "L" and "N".
!
Please note
Incorrect phase sequence can cause damage to
the appliance.
Check for phase equality with the control unit
power supply.
8