Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 35

Integration of the two-stage version in the...
Equipment required
Pos. Designation
Heat source
1 Heat pump stage 1
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
qP
Secondary pump, heat pump stage 2
qQ Circulation pump for cylinder heating (heating water side), heat pump stage
2
qW Safety equipment block with safety assembly
qE Expansion vessel
qT Primary pump, heat pump stage 1
qZ Flow temperature sensor, primary circuit
qU Return temperature sensor, primary circuit
wT
Primary pump, heat pump stage 2
Preparing for installation
(cont.)
2
cable; on-
35