Viessmann VITOTRONIC 300 Installation And Service Instructions Manual page 107

Vitotronic 300, GW5B & MW1B Installation and Service
Connection and Wiring Diagram
PCB 120V~
Legend
Heating circuit pump
sÖ
sA Circulation pump for DHW tank heating
(accessory)
DHW circulation pump (on site)
sK
sL Shunt pump or distribution pump (on site)
(continued)
fÖ Power supply, 120V/60 Hz
Central fault message
gÖ
gS Motor for 3-way mixing valve, primary store
system
Power supply connection for accessories
abH
F Fuse
K1-K10 Relay
S1 ON/OFF switch
X Electrical interfaces
Wiring, Vitotronic 300-K
107