Viessmann VITOCAL 300-A Installation And Service Instructions Manual page 84

Installation sequence
Electrical connections in the control unit
Equipment
DHW circulation pump
(max. 50 W)
Circulation pump for cylinder
reheating.
Control only via on-site contac-
tor; not possible in conjunction
with an electric immersion hea-
ter (on site) for a DHW cylinder
(max. 100 W)
Connecting the temperature limiter for limiting the maximum temperature
of underfloor heating systems
Connection with temperature lim-
iter, general
A Connection to PCB 2, see follow-
ing table
B Temperature limiter
C Heating circuit pump A1, M2
84
(cont.)
Connection Required parameters:
Parameter (ID) Ó Setting
2X7.11 "System definition"
&
1X1.? "Wtimer DHW Circ." (701B)
Ó Setting switching times
1X2.N
(see
page 56)
2X8.13 "Ext. heat source"
"Ext. heat source" (7B00) Ó
&
1X2.N
(see Yes
"Ext. HS for DHW" (7B0D) Ó
&
page 52)
Yes
Connection with temperature lim-
iter (part no. 7151 728, 7151 729)
A Connection to PCB 2, see follow-
ing table
B Temperature limiter
C Heating circuit pump A1, M2