Control Circuit (Part 1) - Viessmann VITOCAL 300-A Installation And Service Instructions Manual

Connection and wiring diagrams

Control circuit (part 1)

176
Note
The total output of all connected appli-
ances must not exceed 1000 W. If the
total output 1000 W, the individual
rating of a component (e.g. pump,
valve, message facility, contactor) can
be greater than specified.
A Switched phase
B Connection, safety chain (part 1),
see page 174
C External heat source control (zero
volt)
D Control, instantaneous heating
water heater (stage 2)
E Control module, instantaneous
heating water heater (see
page 47)
F N/A
G Mixer |OPEN, external heat
source
H Mixer ~CLOSE, external heat
source
K Heating circuit pump for heating
circuit without mixer (A1)
L Circulation pump for cylinder
heating
M Auxiliary output with switching
times (e.g. DHW circulation pump)
N Central fault message (zero volt)
O Connection, control circuit
(part 2), see page 177