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Vitotronic 100, GC1B / Vitotronic 300-K, MW1B Installation and Service
Connection and Wiring Diagram (continued)
PCB 120V~
Wiring, Vitotronic 300-K
Legend
sÖ Heating circuit pump
sA Circulation pump for DHW tank heating
(accessory)
sK DHW recirculation pump (on site)
sL Shunt pump or distribution pump (on site)
fÖ Power supply, 120V/60 Hz
gÖ Central fault message
gS Motor for 3-way mixing valve, primary store
system (optional accessory) (Not Used)
abH Power supply connection for accessories
F Fuse
K1-K10 Relay
S1 ON/OFF switch
X Electrical interfaces
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