Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 77

Electrical connections
Terminal area, heat pump control unit
aVG
F0/F2
F6/F7
F11/F12
F16/F17
LON
E
[CA
X
A Cross connect PCB
B Fuse F1 for heat pump control unit
C Extension of main PCB
Terminal strips on cross connect PCB
A:
X1 Terminals for earth conductor "?"
X2 Terminals for neutral conductor "N"
X3 Terminals for power supply to the
heat pump control unit and auxiliary
components
(cont.)
F3/F4
F8/F9
F13/F14
F18/F20
F21/F23
D
sYF
sYG
sYH
Installation sequence
fÖ sYD sYS
sXG
sXF
sXD sXS sXA
X1
X2
sXÖ
B
C
D Main PCB
E Control and sensor PCB
Connections to plugs on main PCB with
extension C/D:
■ DHW circulation pump
■ Heating circuit pump for heating circuit
without mixer A1
■ Circulation pump for cylinder heating
(heating water side)
■ Instantaneous heating water heater
control, stage 2 (on site)
■ External heat source control
sYA
sYÖ
A
X3
77