2-Stage: Type Bw 301.A + Bws 301.A - Viessmann Vitocal 300-G Series Installation And Service Instructions Manual

Preparing for installation
Requirements regarding on-site connections

2-stage: Type BW 301.A + BWS 301.A

< 42 V
G
H
100
H G
< 42 V
Fig. 2 Type BWS on the left; type BW on the right
Secondary circuit return
A / E
+
Secondary circuit flow
B / F
+
10
230 V~
400 V~
F
E
300
540
270
230
F E
230 V~
400 V~
780
(cont.)
< 42 V
C
D
540
270
230
100
D C
< 42 V 230 V~
780
Primary circuit flow (heat pump brine
C / G
inlet)
/ Primary circuit return (heat pump
D H
brine outlet)
230 V~
400 V~
B
A
B A
400 V~