Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 15

Requirements for on-site connections
697
687
600
A B C D E F
F
E
D
C
B
A
520
438
355
245
163
86
Fig. 2
Secondary circuit flow (heating/cooling circuit 1 /
A
heating water buffer cylinder), connection Cu 28 x
1.0 mm
Cold water, connection Cu 22 x 1.0 mm
B
Outdoor unit flow (indoor unit heating water inlet),
C
connection Cu 28 x 1.0 mm
A
B
C
D
E
F
597
47
Outdoor unit return (indoor unit heating water out-
D
let), connection Cu 28 x 1.0 mm
DHW, connection Cu 22 x 1.0 mm
E
F Secondary circuit return (heating/cooling circuit 1/
heating water buffer cylinder), connection Cu 28 x
1.0 mm
Preparing for installation
15