Viessmann Vitocal 350-A Installation And Service Instructions Manual page 103

Electrical connections in the heat pump control...
L Input for central fault message
facility, lag appliance
Open contact 1X3.10/1X3.11 trig-
gers a message (see central fault
message, page 99).
Required parameters (code to be entered by "Contractor": 5243)
Appliance
Lead appliance
Lag appliance
Note
Set these parameters for all lag
appliances.
Parameter Ó setting
"System definition"
■ "System diagram" Ó "0" to "10"
■ "Ext. extension" Ó "Yes"
■ "Cascade control" Ó "1"
■ "Output lag heat pump" Ó "0" to "255" (see
page 172)
■ "No. of ext. heat p" Ó "1" to "3" (see
page 171)
"System definition"
■ "System diagram" Ó "11"
■ "Cascade control" Ó 0
■ "Set flow ext. demand" Ó "0" to "70" (see
page 193)
Installation sequence
(cont.)
103