Viessmann VITOCAL 300-G Installation And Service Instructions For Contractors page 29

Electrical connection
Plug
sYH
Terminals Function
216.1
External hook-up, heating/cooling cir-
A1
cuits:
Central heating demand, heating cir-
cuit A1/HC1
Or
Smart Grid:
Floating contact 1
216.2 External hook-up, heating/cooling cir-
cuits:
Room cooling demand, heating circuit
A1
A1/HC1
216.4 Smart Grid:
Floating contact 2
Note
If external hook-up for heating/cooling circuits is con-
nected and selected, Smart Grid can be connected to
the EA1 extension (accessories) ("Enable Smart Grid
7E80" on "1").
Expansion PCB on main PCB (230 V~ components)
Information regarding the connection values
■ The specified output is the recommended connected
load.
Total output of all components connected directly to
■
the heat pump control unit (e.g. pumps, valves, mes-
sage facilities, contactors): Max. 1000 W
If the total output is < 1000 W, the individual rating of
a component (e.g. pump, valve, message facility,
contactor) can be greater than specified. However,
the breaking capacity of the relevant relay must not
be exceeded.
■ The specified current indicates the max. switching
current of the switching contact. Observe total cur-
rent of 5 A.
(cont.)
Explanation
230 V~ digital input:
230 V~: Central heating demand for heating circuit
■
A1/HC1 active
0 V: No demand
■
Breaking capacity 230 V, 2 mA
■
230 V~ digital input:
230 V~: Contact active
■
0 V: Contact not active
■
Breaking capacity 230 V, 2 mA
■
230 V~ digital input:
230 V~: Room cooling demand for heating circuit
■
A1/HC1 active
0 V: No demand
■
Breaking capacity 230 V, 0.15 A
■
230 V~ digital input:
230 V~: Contact active
■
0 V: Contact not active
■
Breaking capacity 230 V, 2 mA
■
Set the required parameters during commissioning:
See page 51 onwards.
Installation sequence
29