Viessmann VITOCAL 300-G Installation And Service Instructions For Contractors page 28

Installation sequence
Electrical connection
Plug
sYS
Terminals Function
212.3 DHW circulation pump
212.4 3-way diverter valve for heating water
buffer cylinder bypass or heat pump
in the case of dual alternative mode
Plug
sYF
Terminals Function
214.1 External hook-up, heating/cooling cir-
cuits:
Central heating demand, heating cir-
cuit M2/HC2
M2
214.2 External hook-up, heating/cooling cir-
cuits:
Central cooling demand, heating cir-
cuit M2/HC2
M2
214.3 External hook-up, heating/cooling cir-
cuits:
Central heating demand, heating cir-
cuit M3/HC3
M3
214.4 External hook-up, heating/cooling cir-
cuits:
Central cooling demand, heating cir-
cuit M3/HC3
M3
28
(cont.)
Explanation
Supply values
Output: 50 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Supply values
Output: 130 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Explanation
230 V~ digital input:
230 V~: Central heating demand for heating circuit
■
M2/HC2 active
0 V: No demand
■
Breaking capacity 230 V, 0.15 A
■
230 V~ digital input:
230 V~: Central cooling demand for heating circuit
■
M2/HC2 active
0 V: No demand
■
Breaking capacity 230 V, 0.15 A
■
230 V~ digital input:
230 V~: Central heating demand for heating circuit
■
M3/HC3 active
0 V: No demand
■
Breaking capacity 230 V, 0.15 A
■
230 V~ digital input:
230 V~: Central cooling demand for heating circuit
■
M3/HC3 active
0 V: No demand
■
Breaking capacity 230 V, 0.15 A
■