Viessmann VITOCAL 300-A Installation And Service Instructions Manual page 170

Connection and wiring diagrams
Overview of the PCBs and connection options
PCB 2, terminal X7
Pos. Function
wYP
External heat source
control/demand
N/A
wYQ
Control of instantaneous
heating water heater,
stage 2
wYE
Control of the mixer
motor for the external
heat source, signal
OPEN
wYR
Control of the mixer
motor for the external
heat source, signal
CLOSE
wYT
Heating circuit pump,
heating circuit without
mixer (A1)
wYZ
AW-O-M:
Circulation pump for cy-
linder heating (for instal-
lation position see
page 37)
AWC-I-M:
Three-way valve
wYU
DHW circulation pump
(auxiliary output with
switching times)
170
Explanation
Zero volt N/O contact:
&
Closed: Requirement
&
Open: No requirement
&
Breaking capacity 250 V~, 4
(2) A
&
Not suitable for safety LV (≤
42 V~)
On-site connection
N/A
Accessories
&
Output 10 W
On-site connection
&
230 V
On-site connection
&
230 V
On-site connection
&
This pump is installed in addi-
tion to the secondary pump if
a heating water buffer cylinder
is installed.
&
Max. output: 100 W
On-site connection
&
Max. output: 130 W
&
Voltage: 230 V
On-site connection
Internal connection
&
Max. output: 50 W
&
Voltage: 230 V
On-site connection
(cont.)
Terminals
2X7.1
2X7.2
2X7.3
2X7.4
2X7.5
2X7.7
2X7.8
2X7.9
2X7.10
2X7.11