Viessmann VITOTRONIC 200 Service Instructions Manual page 169

Luster terminals (only Vitocal 222-G/242-G)
Terminals Function
X3.1 Phase switched
X3.3 Flow limiter, well circuit.
X3.4
X3.6 Power-OFF.
X3.7
G
X3.8 Primary circuit pressure
X3.9 switch and/or frost stat.
or
Jumper.
P
X3.18 Power supply to heat
pump control unit:
Phase L1
X1.1 Earth conductor
X2.1 Neutral conductor
connection
connection
PCBs and connection options
(cont.)
Explanation
Floating contact required:
■ Closed: Heat pump in operation
■ 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.
Floating contact required:
■ Closed: Safety chain has continuity
■ Open: Safety chain interrupted; heat
pump shut down
■ Breaking capacity 230 V~, 0.15 A
On-site connections:
■ Connected in series if both safety com-
ponents are installed.
■ Insert jumper if no safety compo-
nents are installed.
Connected to 230 V~ power supply on
site.
169