Viessmann VITOTRONIC 300 Installation And Service Instructions Manual page 105
Type gw5b & mw1b, digital boiler control unit & weather-compensated digital cascade control unit
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Also See for VITOTRONIC 300:
- Installation and service instructions manual (164 pages) ,
- Operating instructions manual (73 pages) ,
- Technical data manual (8 pages)
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Vitotronic 300, GW5B & MW1B Installation and Service
Connection and Wiring Diagram
PCB 120V~
sÖA1 High temperature circuit pump
DHW circulation pump
sA
DHW recirculation pump
sK
Accessories pump
sL
Power supply, 120V/60 Hz
fÖ
fA
Burner (call for heat)
Central fault message
gÖ
gSA1 Isolation valve
or
3-way mixing valve, primary store system (optional
accessory)
aBÖ
External connections, e.g. supplementary safety
equipment
Safety chain, potential free
aBA
aBH
Power supply for accessories
(continued)
F1, F2 Fuse/MCB
K1-K10 Relay
S1
ON/OFF switch
X
Electrical interfaces
Wiring, Vitotronic 300, GW5B
105
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