Viessmann VITOCAL 242-G Installation And Service Instructions Manual page 71

Connecting the external electrical components
Natural cooling with NC-Box
The NC-Box is a fully assembled unit
for the implementation of the natural
cooling function, subject to version
with (part no. 7244 674) or without
mixer (part no. 7244 673). It contains
all essential pumps, valves and the
plate-type heat exchanger.
natural cooling with individual components (on-site installation)
For the electrical connection of the
individual components (pumps,
valves, contact humidity switch etc.),
we recommend the use of the natural
cooling extension kit (part
no. 7179 172)
Pump of the heating circuit without mixer
A Terminals in the control panel
B Pump of the heating circuit with-
out mixer
Power-OFF connection (400/230 V)
The signal from the power-OFF contact has the following effects:
Notification to control unit (via junction box terminal strip X60)
Shutting down the supply voltage of the respective component
Installation sequence
(cont.)
Power is connected via terminals
X60.19 and X60.21 inside the Com-
pact Energy Tower control panel.
Installation instructions NC-
Box and technical guide
Vitocal 200/222/242
Power is connected via terminals
X60.19 and X60.21 inside the Com-
pact Energy Tower control panel.
Installation instructions, nat-
ural cooling extension kit and
technical guide Vitocal 200/
222/242
Breaking capacity: 230 V~, 0.7 A
Note
The heating circuit pump with mixer is
connected to the extension kit (for one
heating circuit with mixer).
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