Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 42

Preparing for installation
Integration of the two-stage version in the...
I Lead appliance (two-stage) of
the heat pump cascade
II to IV Lag heat pump (two-stage) 1 to
3
Equipment required
Pos. Description
Heat source
1 Heat pump stage 1
Note
For recommended compressor power cable, see page 15, on-site fuse pro-
tection (see from page 104 and 242)
3 Outside temperature sensor
2
Heat pump control unit (for the power supply, use a 3 x 1.5 mm
site fuse protection ≤ 16 A)
5
Circulation pump for cylinder heating (heating water side), heat pump stage
1
6 Secondary pump, heat pump stage 1
9 Heat pump stage 2
Note
For recommended compressor power cable, see page 15, on-site fuse pro-
tection (see from page 104 and 242)
qP Secondary pump, heat pump stage 2
qQ Circulation pump for cylinder heating (heating water side), heat pump stage
2
qT Primary pump, heat pump stage 1
qZ Primary circuit flow temperature sensor (for installation, see page 84)
qU Primary circuit return temperature sensor (for installation, see page 84)
wT Primary pump, heat pump stage 2
Electrical connection
For further information regarding the
PCBs, see from page 220.
42
(cont.)
2
cable; on-