Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 37

Integration of the two-stage version in the...
C Interface to the separate cooling
circuit or heating/cooling circuit
H
Interface to the heating circuits
or the heating water buffer cylin-
der
P Interface to the primary circuit
Equipment required
Pos. Designation
Heat source
1 Heat pump stage 1
Note
For recommended compressor power cable, see page 12, on-site fuse pro-
tection (see from page 91 and 134)
2
Heat pump control unit (for the power supply, use a 3 x 1.5 mm
site fuse protection ≤ 16 A)
3 Outside temperature sensor
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 12, on-site fuse pro-
tection (see from page 91 and 134)
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 87)
qU Primary circuit return temperature sensor (for installation, see page 87)
wT Primary pump, heat pump stage 2
Preparing for installation
(cont.)
W Interface to the DHW cylinder
I Lead appliance (two-stage) of
the heat pump cascade
II to IV Lag heat pumps 1 to 3, each
two-stage
2 cable; on-
37