Viessmann BW 301.B06, Installation And Service Instructions Manual

Page: 33 / 132

33
Plug sXS
Clamps Function Explanation
222.2
Control of mixer motor for external
heat generator
Signal mixer OPEN Connection values
■
Output: 10 W
■
Voltage: 230 V~
■
Max. switching current: 0.2(0.1) A
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: Floating contact
Connection values (contact breaking capacity)
■
Voltage: 230 V~
(not suitable for safety LV)
■
Max. switching current: 4(2) A
Central heating:
■
Secondary pump, heat pump
■
Secondary pump, heat pump stage
2 (if installed)
■
External heat generator
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)
DHW reheating:
■
Circulation pump for cylinder heat-
ing
or
■
3-way diverter valve "central heat-
ing/DHW heating"
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)
High limit safety cut-out for heat pump in conjunc-
tion with an external heat source
222.3
222.4
A
X3.1
X2.N
C
B
K1
D
Fig. 26
A
Terminals on extension PCB
B
Move jumper from X3.1 to 222.3
C
Connection on the external heat source at termi-
nals for external demand
D
High limit safety cut-out (max. 70
º
C) as heat pump
protection
K1 Relay; sizing in accordance with the external heat
source; observe safety instructions
Installation sequence
Electrical connection
(cont.)
5516461
Installation