Viessmann Vitocal 300-G Installation And Service Instructions Manual page 179

PCB 2: Function components 230 V
Function
N/A
Control of the instanta-
neous heating water hea-
ter control (stage 2)
Control of the AC-Box or
the circulation pump of
the separate cooling cir-
cuit
Control of the mixer motor
for the external heat
source, signal OPEN
Control of the mixer motor
for the external heat
source, signal CLOSE
Circulation pump, direct
heating circuit A1
Circulation pump for cy-
linder heating
Auxiliary output with
switching times (e.g.
DHW circulation pump)
Connection and wiring diagrams
(cont.)
Explanation
N/A
Install control module (accessory)
P=10 W
This pump is started in parallel if
cooling takes place with the AC-
Box and heating water buffer cylin-
der.
Contactor relay required on site
U=230 V
P=10 W
U=230 V
U=230 V
This pump is installed in addition to
the secondary pump if a heating
water buffer cylinder is installed.
P =100 W
max
Observe the information regarding
the total current drawn (from the
table)!
In systems with cylinder primary
system: Install pump between the
heat pump and the additional heat
exchanger.
P =130 W
max
Observe the information regarding
the total current drawn (from the
table)!
U=230 V
If no cylinder primary system is
installed: Connect pump here
Pmax.=150 W
Observe the information regarding
the total current drawn (from the
table)!
U=230 V
Connection
2X7.3
2X7.4
2X7.5
2X7.6
2X7.7
2X7.8
2X7.9
2X7.10
2X7.11
179