907.65.02.00
Stand 10/2019
- 10 -
GB
4.3 Hydraulic connection
Sample illustration with optional accessories (circulation unit)
This illustration does not claim to be exhaustive; it is not a replacement for specialist
planning.
Designation
Description
HW
Hot water
CW
Cold water
HF
Heating flow
HR
Heating return
CI
Circulation
Safety valve bypass line
Persons must not be endangered by hot water and vapour escaping. Two or more safety
valves' blow-off lines must be unrestricted; they must individually end at a drainage point.
The outlet diameter of the blow-off lines must match the dimensions of the connected safety
valve, include no more than two bends, and not exceed a maximum length of two metres.
The entire blow-off line must be enlarged if it is necessary to install more bends or lines in
excess of the maximum length. More than three bends and a length in excess of four metres
are not permitted.
The end of the blow-off line must be located 20-40 mm over a sanitary drainage object or
drainage funnel and clearly visible.
The end of the blow-off line must be protected from frost.
