Viessmann VITOTRONIC 200 Service Instructions Manual page 291

Vitocal 300-A cross connect PCB
Terminals Function
X3.8
X3.9
Frost stat
and/or
Contact humidistat
or
Jumper
X3.10 Fault message, lag heat pump in a
X3.11 cascade
or
Jumper
X3.12 "External demand" signal: External
X3.13 starting of compressor and pumps,
mixer in control mode or OPEN,
changeover of the operating status of
several system components
X3.17 Fuse F1 6.3 A (slow)
X3.18
X3.18 Heat pump control unit power supply:
Phase L1
X1.1 Earth conductor terminal
X2.1 Neutral conductor terminal
(cont.)
Explanation
Requires floating contact:
Closed: Safety chain has continuity
■
Open: Safety chain interrupted; heat pump shut down
■
Breaking capacity 230 V~, 0.15 A
■
Connected in series if more than one safety compo-
■
nent is installed
Insert jumper if no safety components are instal-
■
led.
Requires floating contact:
Closed: No fault
■
Open: Fault
■
Breaking capacity 230 V~, 0.15 A
■
No jumper should be installed if a message contact is
connected.
Requires floating contact:
Closed: Demand
■
Open: No demand
■
Breaking capacity 230 V, 2 mA
■
Note
These and further external functions (such as provi-
■
sion of external set values) can alternatively be con-
nected via the external EA1 extension (not in con-
junction with Smart Grid).
"EA1 extension" installation instructions
Power supply 230 V~
PCBs and connection options
291