Viessmann VITOTRONIC 200 Service Instructions Manual page 166

PCBs and connection options
Cross connect PCB
X2 Terminals X2.N for neutral con-
ductors of all corresponding sys-
tem components
X3 ■ Mains terminals for power sup-
ply to control unit "L1" and aux-
iliary components
■ Switched phase L1:
X3.1, X3.2, X3.3, X3.7, X3.11,
X3.13
■ Terminals for message and
safety connections
Terminals Function
X3.1 Phase switched
X3.2 Signal "External blocking"
X3.14 (external blocking of com-
or to exter- pressor and pumps; mixer
nal exten- in control mode or
sion H1 CLOSED).
X3.3 Flow limiter, well circuit.
X3.4
X3.6 Power-OFF.
X3.7
G
166
(cont.)
X5/X7
X6/X8 Internally occupied terminals
Explanation
Floating contact required:
■ Closed: Blocking enabled
■ Open: No blocking
■ Breaking capacity 230 V~, 2 mA
Floating contact required:
■ Closed: Heat pump operational
■ Open: Heat pump shut down
■ Breaking capacity 230 V~, 0.15 A
With a connected flow limiter, no jumpers
should be installed.
Floating contact required:
■ Closed: No blocking (safety chain has
continuity)
■ Open: Blocking enabled
■ Breaking capacity 230 V~, 0.15 A
With a connected power-OFF contact no
jumpers should be installed.
Internally occupied ter-
/
minals
Terminals for connect-
ing cable (control cable
230 V~) to the heat
pump control panel