Viessmann VITOCAL 350-A Installation And Service Instructions Manual page 49

Electrical connections: Heat pump control unit
A BCD
Fig. 43
Type AWHO 351.A
Fig. 44
Instantaneous heating water heater (accessories)
E
Red wires to be removed (see fig. 43 on page 48)
X6.6 211.2
A —
X6.2 211.3
B
—
X6.1 224.4
C —
X6.4 211.4
D —
The following components are connected in the heat
pump control unit (see page 51 onwards):
■ Secondary pump
■ Circulation pump for cylinder heating
■ Instantaneous heating water heater switching
sXF
sYA
(cont.)
Type AWHI 351.A: Secondary pump outside the
heat pump
Fig. 45
Instantaneous heating water heater (accessories)
E
Red wires to be removed (see fig. 43 on page 48)
X6.6 211.2
A —
D X6.4 211.4
—
The following components are connected in the heat
pump control unit (see page 51 onwards):
Secondary pump
■
Circulation pump for cylinder heating
■
The following components are connected in the heat
pump control panel (see separate installation instruc-
tions and page 37 onwards):
Instantaneous heating water heater
■
Installation sequence
49