Viessmann VITOCAL 242-S Installation And Service Instructions Manual page 9

Requirements regarding on-site connections
Cable lengths in the internal/external unit plus wall clearance
Cables
Power cables:
■ Heat pump control unit (230 V~)
■ Compressor (230 V~/400 V~)
Other connecting cables:
■ 230 V~, e.g. for circulation pumps
■ < 42 V, e.g. for sensors
Internal/external unit connecting cable:
■ 12 V BUS
■ 43 V BUS
Recommended power cables
Type AWT-AC
Heat pump control unit (internal unit) 230 V~
Cable cross-section
■ Without power-OFF
■ With power-OFF
Instantaneous heating water heater
Cable cross-section
■ 400 V~
■ 230 V~
Max. cable length
Type AWT-AC
External unit 230 V~ (compres-
sor)
Cable cross-section
Max. cable length
Cable cross-section
Max. cable length
Type AWT-AC
External unit 400 V~ (compressor)
Cable cross-section
Max. cable length
Internal unit
241.A04 to A13, B10, B13
241.A04 241.A07
2
3 x 2.5 mm 3 x 2.5 mm
29 m 25 m
–
–
Preparing for installation
(cont.)
External unit
2.0 m
–
2.0 m
2.0 m
2.5 m
2.5 m
2
3 x 1.5 mm
2
5 x 1.5 mm
2
5 x 2.5 mm
2
7 x 2.5 mm
25 m
241.A10 241.A13
2 2
3 x 2.5 mm 3 x 4.0 mm
20 m
or
– 3 x 4.0 mm 2
3 x 6.0 mm
– 32 m
241.B10 241.B13
2
5 x 2.5 mm 5 x 2.5 mm
30 m
–
1.5 m
–
–
1.5 m
1.5 m
2
20 m
or
2
30 m
2
30 m
9