Viessmann VITOCAL 300-A Installation And Service Instructions Manual page 93

Type awc-i-m, aw-o-m compact heat pump with electric drive, 230 v~
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Installation sequence
Electrical connections in the control unit
(cont.)
Cascade control
Make connections to "Ext. extension
H1" only according to the following
diagram.
A Heat pump 1 (lead appliance)
B KM BUS
93

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