Viessmann VITOCAL 300, Installation And Service Instructions Manual

Page: 138 / 160

A
Connection to the control PCB,
sensors and remote controls (see
page 133, X13 to X4 and X4 to
X3)
B
Power supply from main isolator
and phase monitor
C
Safety chain input (individual free
core from X8.1, see page 135)
D
On-site contactor for primary
pump in systems with intermedi-
ate circuit
8
Control PCB
wI
External heat pump control
eU
Natural cooling control
eI
Mixer 1, external heat source or
primary cooling circuit OPEN
eO
Mixer 1, external heat source or
primary cooling circuit CLOSE
rP
Heating circuit pump, direct heat-
ing circuit
rP
Heating circuit pump, direct heat-
ing circuit
rQ
Cylinder primary pump
rW
Immersion heater, DHW cylinder
rE
Instantaneous heating water hea-
ter stage 2 (6 kW)
rR
Mixer 2 OPEN (heating circuit with
mixer)
rT
Mixer 2 CLOSE (heating circuit
with mixer)
rZ
Heating circuit pump heating cir-
cuit with mixer
rI
DHW circulation pump
rO
Central fault message, zero volt
tP
Central fault message, zero volt
tQ
Electric heater stage 1 (3 kW)
tW
Secondary pump (integral)
tE
Primary pump or intermediate cir-
cuit pump for type WWC (integral)
tT
Solenoid valve, LPG, compressor
tZ
Compressor
tU
Instantaneous heating water hea-
ter stage 2 (6 kW)
tI
On-site contactor for primary
pump in systems with type WWC
with intermediate circuit.
The control pulse can be taken
from the coil connection of K32.
Control PCB
(cont.)
138
Connection and wiring diagrams
55
92
901
GB