Viessmann Vitocal 350-A Installation And Service Instructions Manual page 211

Overview of the PCBs and connection options
Pos. Function
wYZ
Circulation pump for cylin-
der heating (for installation
position see page 39)
wYU
DHW circulation pump
(auxiliary output with
switching times)
wYI
Central fault message
Connection and wiring diagrams
Explanation
■ Max. output: 130 W
■ Voltage: 230 V
On-site connection
■ Max. output: 50 W
■ Voltage: 230 V
On-site connection
Zero volt contact:
■ Closed: Fault
■ Open: No fault
■ Contact breaking capacity
250 V~, 4(2) A
■ Not suitable for safety LV
On-site connection
(cont.)
Terminals
2X7.10
2X7.11
2X7.12
2X7.13
211