Viessmann VITOCAL 222-G Series Installation And Service Instructions For Contractors page 18

Installation sequence
Hydraulic connections
Primary circuit connections to the right
A
B
C
F
E
Fig. 13
Pos. Meaning
Secondary circuit return
A
(heating water)
Secondary circuit flow
B
(heating water)
DHW
C
Cold water
D
Primary circuit flow (heat
E
pump brine inlet)
Primary circuit return (heat
F
pump brine outlet)
18
(cont.)
D
2.
4x
1.
4x
Connection
Cu 28 x 1.5 mm
Cu 28 x 1.5 mm
Rp (female
¾
thread)
Rp (female
¾
thread)
Cu 28 x 1.5 mm
Cu 28 x 1.5 mm
Primary circuit connections to the left
A
B
C
D
Fig. 14
Pos. Meaning
Secondary circuit return
A
(heating water)
Secondary circuit flow
B
(heating water)
DHW
C
Cold water
D
Primary circuit flow (heat
E
pump brine inlet)
Primary circuit return (heat
F
pump brine outlet)
2.
4x
1.
4x
F
E
Connection
Cu 28 x 1.5 mm
Cu 28 x 1.5 mm
Rp (female
¾
thread)
Rp (female
¾
thread)
Cu 28 x 1.5 mm
Cu 28 x 1.5 mm