Viessmann Vitocal 300-G Installation And Service Instructions Manual page 48

Compact heat pump with electric drive type bw/bwc, ww/wwc
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Preparing for installation
System version 3 (type BW/WW)
LP PCB (see page 63)
48
(cont.)
A Plug aCH connected to the cable
harness
B Control module for instantaneous
heating water heater

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