Control Circuit (Part 2) - Viessmann Vitocal 300-G Installation And Service Instructions Manual

Connection and wiring diagrams

Control circuit (part 2)

188
A Connection, control circuit
(part 1), see page 187
B Compressor relay (control unit
enable)
C Primary pump (already integrated
for type BWC/WWC)
D Protective motor switch, primary
pump (primary pump already inte-
grated in type BWC/WWC; if pro-
tective motor switch is installed,
jumper fitted at the factory, see
page 186)
E Control signal natural cooling
(NC)
F Secondary pump
G Instantaneous heating water hea-
ter (stage 1)
H Mixer |OPEN, heating circuit
with mixer M2
K Mixer ~CLOSE, heating circuit
with mixer M2
L Heating circuit pump for heating
circuit with mixer M2
M Cylinder primary pump / shut-off
valve
N Control, electric immersion heater
EHE (or cylinder reheating with
pump when using an external heat
source)