Viessmann VITOTRONIC 300-K Operations Instructions Page 89

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5693 976 - 04
Vitotronic 200 and 300-K Installation and Service
Designs
Connection and Wiring Diagrams (continued)
Main PCB 120V~
Legend
Heating circuit pump
or
Primary store system
sA DHW pump (accessory)
sK DHW recirculation pump (accessory)
sL Distribution pump
Power supply 120V/60 Hz
Central fault message (on site)
gS 3-way mixing valve, primary store system
aBH Power supply connection of accessories
F Fuse
K2-K10 Relay
S1 ON/OFF switch “8
X... Electrical interfaces
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