Cross Connect Pcb (Signal And Safety Connections) - Viessmann Vitocal 300-A Installation And Service Instructions Manual

Installation sequence
Electrical connections, heat pump control unit
Immersion heater 400 V~
224.7
B
X2.N
Fig. 30
Immersion heater, power supply 3/N/PE
A
400 V/50 Hz
Terminals of the heat pump control unit
B
Plug
sXG
Terminals Function
225.1 Heating circuit pump of the heating
circuit with mixer M2/HC2
M2
r
225.2 Mixer motor control, heating circuit
M2/HC2
M2
Signal mixer CLOSED
225.3 Mixer motor control, heating circuit
M2/HC2
M2
Signal mixer OPEN

Cross connect PCB (signal and safety connections)

Set the required parameters during commissioning:
See from page 56.
34
L1 L2 L3 N
?
A
(cont.)
Immersion heater 230 V~ (on site)
224.7
B
X2.N
Fig. 31
Immersion heater, power supply 1/N/PE
A
230 V/50 Hz
Terminals of the heat pump control unit
B
Explanation
Connect a temperature limiter to restrict the maximum
temperature for underfloor heating circuits (if installed)
in series.
Connection values:
Output: 100 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Connection values:
Output: 10 W
■
Voltage: 230 V~
■
Max. switching current: 0.2(0.1) A
■
Connection values:
Output: 10 W
■
Voltage: 230 V~
■
Max. switching current: 0.2(0.1) A
■
L1 L1 L1 N N N
?
A