Viessmann Vitocal 300-G Installation And Service Instructions Manual page 18

Preparing for installation
Requirements for on-site connections
2-stage (type BW 301.B + BWS 301.B)
< 42 V
L
Fig. 13 Type BWS on the left; type BW on the right
/ Heating water return and DHW cylinder return
A F
+
/ DHW cylinder flow (heating water side)
B G
/ Heating water flow
C H
/ Primary circuit flow (heat pump brine inlet)
D K
E / L Primary circuit return (heat pump brine outlet)
18
524
449
230 V~ < 42 V
L
H
K
G
300
F
496
361
182
125
K 67
F
230 V~
G
H
< 42 V
600
(cont.)
524
449
230 V~
E
C
D
B
A
496
361
182
125
E D
A
230 V~
B
C
< 42 V
600
67