Viessmann Vitocal 300-G Installation And Service Instructions Manual page 181

PCB 2: Function components 230 V
Function
Instantaneous heating
water heater (stage 1)
Control of the mixer
motor, heating circuit M2,
signal OPEN
Control of the mixer
motor, heating circuit M2,
signal CLOSE
Circulation pump, heating
circuit with mixer M2
Cylinder primary pump,
two-way shut-off valve
Control of electric immer-
sion heater EHE for DHW
cylinder
or
Circulation pump, cylin-
der reheating through an
external heat source (for
DHW heating)
Connection and wiring diagrams
(cont.)
Explanation
Instantaneous heating water heater
control signal, stage 1
Install control module (accessory)
P=10 W
230 V
230 V
Pmax.=100 W
Observe the information regarding
the total current drawn (from the
table)!
In systems with cylinder primary
system: Install pump between the
DHW cylinder and the additional
heat exchanger.
Control two-way shut-off valve in
parallel
Pmax.=130 W
Observe the information regarding
the total current drawn (from the
table)!
This connection can be used to
control an electric immersion hea-
ter EHE, if the external heat source
is not used for DHW heating.
Connection
2X8.8
2X8.9
2X8.10
2X8.11
2X8.12
2X8.13
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