Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 66

Installation sequence
Electrical connections in the heat pump control...
4.
[H
X
aVG
[G
X
B < 42 V low voltage connecting leads
with plugs aJ and aVG
C 230 V~ connecting cables with
plugs "X300" and aBH
66
aVG
3.
< 42 V
aBH
[C-Ö
X
5.
D Primary pump power cable, if instal-
led (connection to terminals 4X41.4,
see next chapter)
(cont.)
B C
230 V