Viessmann Vitocal 300-G Installation And Service Instructions Manual page 33

Electrical connection
Plug
sXS
Clamps Function
222.2
Control of mixer motor for external
heat generator
Signal mixer OPEN
222.3
222.4
Control of external heat generators
and 1 high limit safety cut-out each
(on site, max. 70 °C), to switch off or
switch between the following compo-
nents:
Central heating:
Secondary pump, heat pump
■
Secondary pump, heat pump stage
■
2 (if installed)
External heat generator
■
DHW reheating:
Circulation pump for cylinder heat-
■
ing
or
3-way diverter valve "central heat-
■
ing/DHW heating"
High limit safety cut-out for heat pump in conjunc-
tion with an external heat source
X3.1
B
C
222.3
A
222.4
D
K1
X2.N
Fig. 26
Terminals on extension PCB
A
Move jumper from X3.1 to 222.3
B
Connection on the external heat source at termi-
C
nals for external demand
High limit safety cut-out (max. 70
D
protection
K1 Relay; sizing in accordance with the external heat
source; observe safety instructions
(cont.)
C) as heat pump
º
Explanation
Connection values
Output: 10 W
■
Voltage: 230 V~
■
Max. switching current: 0.2(0.1) A
■
Floating contact
Connection values (contact breaking capacity)
Voltage: 230 V~
■
(not suitable for safety LV)
Max. switching current: 4(2) A
■
Connections for high limit safety cut-outs for central
heating:
In series to the secondary pump (terminal 211.2 on
■
the main PCB)
In series to the secondary pump, heat pump stage 2
■
(terminal 224.3)
In series for controlling the external heat generator
■
(terminal 222.3)
Connections for high limit safety cut-outs for DHW re-
heating:
In series with the circulation pump for cylinder heating
■
or 3-way diverter valve "central heating/DHW heating"
(terminal 211.4 on main PCB)
Installation sequence
33