Viessmann VITOCAL 300-A Installation And Service Instructions Manual page 89

Electrical connections in the control unit
D High limit safety cut-out STB (set
to 70 °C) as heat pump protection
K1 Relay; sizing in accordance with
the external heat source; observe
safety instructions
Equipment
Mixer motor, external heat
source
Control of an external heat
source
Circulation pump for cylinder
reheating
Connecting external functions
These functions can also be connected via the "Ext. extension H1".
Installation instructions "Ext. extension H1"
Note
Only one function (e.g. external demand) or one component (e.g. swimming
pool water heating) can be connected to external extension H1.
(cont.)
Connection Required parameters:
Parameter (ID) Ó Setting
2X7.7VO- "Ext. heat source"
"Ext. heat source" (7B00) Ó
PEN &
1X1.? "Yes"
1X2.N
2X7.8vC-
LOSE
2X7.1 "Ext. heat source"
"Ext. heat source" (7B00) Ó
2X7.2 &
"Yes"
2X8.13 "Ext. heat source"
"Ext. heat source" (7B00) Ó
1X1.? &
1X2.N "Yes"
Installation sequence
89