Viessmann Vitocal 200-G Series Installation And Service Instructions Manual page 35

Electrical connection
Terminals Function
X3.2 In systems without heating water
■
X3.14 buffer cylinder: Temperature limiter
or at EA1 ex- to restrict the maximum tempera-
tension ture of underfloor heating (if instal-
led)
and/or
"External blocking" signal: External
■
blocking of compressor and pumps,
mixer in control mode or CLOSE
Note
In systems with heating water buffer
cylinder the temperature limiter is
connected in series to the relevant
heating circuit pump: See chapter
"Temperature limiter to restrict the
maximum temperature of underfloor
heating".
X3.3 Flow switch, well circuit
X3.4
X3.6 Power-OFF
X3.7
G
(cont.)
Explanation
Floating contact (N/O contact) required:
Closed: Blocking enabled
■
Open: No blocking
■
Breaking capacity 230 V~, 2 mA
■
Note
The system may no longer be protected against frost
■
These and further external functions (e.g. provision of
■
external set values) can alternatively be connected
via the external EA1 extension.
See "EA1 extension" installation instructions
Requires floating contact:
Closed: Heat pump operational
■
Open: Heat pump shut down
■
Breaking capacity 230 V, 0.15 A
■
Note
No jumper should be installed if a flow switch is con-
nected.
Requires floating contact:
Closed: Heat pump operational
■
Open: Heat pump shut down
■
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
■
2
(3 x 1.5 mm ) and the cable for the power-OFF signal
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.
Installation sequence
35