Viessmann VITOCAL 222-G Series Installation And Service Instructions For Contractors page 30

Installation sequence
Electrical connection
Terminals Function
X3.1 Switched phase
X3.2 In systems without heating wa-
■
X3.14 ter buffer cylinder: Temperature
or at EA1 exten- limiter to restrict the maximum
sion temperature of underfloor heat-
ing circuit (if installed)
and/or
"External blocking" signal: Exter-
■
nal blocking of compressor and
pumps, mixer in control mode or
CLOSE
Note
In systems with heating water buf-
fer cylinder the temperature limiter
is connected in series to the rele-
vant heating circuit pump: See
chapter "Temperature limiter to re-
strict the maximum temperature of
underfloor heating circuit".
X3.6 Power-OFF
X3.7
G
30
(cont.)
Explanation
Via control unit ON/OFF switch
Note
Observe the total load 1000 W of all connected compo-
nents.
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 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.