Viessmann VITOTRONIC 100 GC1B Installation Manual Page 155

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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
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)
Power supply, 120V/60 Hz
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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