Viessmann VITOTRONIC 200 Service Instructions Manual page 290

PCBs and connection options
Vitocal 300-A cross connect PCB
Terminals Function
X3.1, X3.2, Switched phase
X3.3, X3.7,
X3.11, X3.13,
X3.16
X3.2 "External blocking" signal: External
X3.14 blocking of compressor and pumps,
mixer in control mode or CLOSE
X3.3 Flow switch, secondary circuit
X3.4
X3.6 Power-OFF
X3.7
G
290
(cont.)
Explanation
Note
Observe the total load of 1000 W for all connected
components.
Requires floating contact:
Closed: Blocking active
■
Open: No blocking
■
Breaking capacity 230 V~, 2 mA
■
Note
These and further external functions (such as provi-
■
sion of external set values) can alternatively be con-
nected via the external EA1 extension (not in con-
junction with Smart Grid).
"EA1 extension" installation instructions
Requires floating contact:
Closed: Heat pump operational
■
Open: Heat pump shut down
■
Breaking capacity 230 V~, 0.15 A
■
Jumper is used in some devices.
■
No jumper should be installed if a flow switch is con-
■
nected.
Requires floating contact:
Closed: No blocking (safety chain continuous)
■
Open: Blocking active
■
Breaking capacity 230 V~, 0.15 A
■
Note
No parameters need to be set
■
No jumper should be installed if a power-OFF contact
■
is connected.
The compressor is "forced" off as soon as the contact
■
opens.
The power-OFF signal switches off the supply voltage
■
of the respective component (subject to the power
supply utility).
For the instantaneous heating water heater, the
■
stages to be switched off can be selected (parameter
"Output for instant. heating water heater at pow-
er-OFF 790A").
The power supply for the heat pump control unit
■
(3 x 1.5 mm
can be combined in a single 5-core cable.
In connection with Smart Grid:
The power-OFF signal must not be connected.
Jumper must be installed.
2
) and the cable for the power-OFF signal