Power Supply - Viessmann Vitocal 300-G Pro SPS Installation And Service Instructions For Contractors

Overview of electrical connections
Terminals Sensor
25X6 Output demand, external heat source
22X2 Variable speed control, circulation
pump for DHW heating
27X5 Temperature sensor, cylinder heating,
bottom
28X6 Flow temperature sensor
Heating circuit 1
29X6 Flow temperature sensor
Heating circuit 2
30X6 Flow temperature sensor
Heating circuit 3
22X4 Temperature sensor, DHW, top
22X6 Temperature sensor, DHW, bottom
22X8 Flow temperature sensor, DHW heat-
ing
40X7 Temperature sensor, heat exchanger
residual heat, brine inlet
40X8 Temperature sensor, heat exchanger
residual heat, brine outlet
25X8 Flow temperature sensor
External heat source
37X0 Temperature sensor, cylinder, cold wa-
ter top
37X2 Temperature sensor, cylinder, cold wa-
ter bottom
37X4 Flow temperature sensor, heating
Cylinder, cold water
Danger
Incorrectly executed electrical installations can
result in injuries from electrical current and in
appliance damage.
All sensor leads and 0-10 V signal leads must
be shielded with copper braiding and have a
minimum cross-section of 0.5 mm².
Specified lead type: CV.

Power supply

Isolators for non-earthed conductors
The integral mains isolator must simultaneously iso-
■
late all non-earthed conductors from the mains with a
minimum contact separation of 3 mm.
(cont.)
Type
0-10 V
0-10 V
Pt 1000 (PTC)
Pt 1000 (PTC)
Pt 1000 (PTC)
Pt 1000 (PTC)
Pt 1000 (PTC)
Pt 1000 (PTC)
Pt 1000 (PTC)
Pt 1000 (PTC)
Pt 1000 (PTC)
Pt 1000 (PTC)
Pt 1000 (PTC)
Pt 1000 (PTC)
Pt 1000 (PTC)
Danger
Incorrectly executed electrical installations can
result in injuries from electrical current and in
appliance damage.
Connect the power supply and implement all
safety measures (e.g. RCD circuit) in accord-
ance with the following regulations:
IEC 60364-4-41
■
■ VDE regulations
■ Technical connection requirements specified
by the local power supply utility
Installation sequence
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