Viessmann Vitocal 350-A Installation And Service Instructions Manual page 99

Electrical connections in the heat pump control...
External blocking, external mixer
"CLOSED"
1X3.2
A B
1X3.14
A Terminals on PCB 1
B Zero volt N/O contact
Breaking capacity 230 V~; 0.1 A
Required parameters (code to be entered by "Contractor": 5243)
Function
External blocking
External mixer "CLOSED"
Central fault message
2X7.12
A
2X7.13
A Terminals on PCB 2
Zero volt contact, open in fault-free
operation (voltage > 42 V)
Breaking capacity 230 V~; 4(2) A
Parameter Ó setting
"System definition"
■ "Ext. blocking effect" Ó "0" to "31" (see
page 177)
"System definition"
■ "Ext.blocking/Miclose" Ó "0" to "8" (see
page 176)
Observe parameter "Ext. blocking effect" (see
page 177).
L1
230 V~, 0.5 A
N
Installation sequence
Note
■ No parameters need to be set.
■ The contact issues a short pulse when
the power supply is switched on.
Observe the pulse when processing
the message via communication tools.
(cont.)
99