Viessmann Vitocell 100-U Installation Instructions For Contractors page 11

Hydraulic connection (on the solar side)
4.
1.
3.
Fig. 9
1. Fit the solar elbow with sensor well to the flow line.
Note
Counterhold mating part with a spanner.
2. Attach heat meter display with support.
(cont.)
2.
3. Insert temperature sensor into solar elbow as far
as it will go.
4. Fasten the temperature sensor with the strain relief
screw.
11