Wolf MKS 140, Technical Manual And Installation Instructions, Page: 12 / 20

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Safety equipment
Expansion vessels of sealed heating systems are provided with a standpipe as safety
equipment in accordance with DIN 4750 or a safety valve in accordance with TRD 721.
Install an expansion vessel compliant with DIN 4807 T2 for each boiler system at its
highest point.
A thermometer with sensor well is fitted to the flow of each boiler.
Each boiler is equipped with a water level indicator which is visible from the boiler
control position, which enables the static pressure of the heating system to be
checked that any time.
Mark the lowest permissible water level on the water level indicator.
The pipework between the boiler, the expansion vessel and the safety valve must not
be able to be shut off. A valve which has been protected against unauthorised closure,
e.g. a cap valve, would also be acceptable.
The system diagram only indicates the safety requirements but is not a recommendation
for specific types of heating network control.
Fresh air
ventilation/
exhaustion
Cap valve
Safety valve
Expansion vessel
Test line
Heat consumer
Shut-off valve
Boiler fill and
drain valve
Safety valve
Expansion vessels
Thermometer
Water level indicator
Please note:
Thermometer
Safety equipment
acc. to DIN 4751 part 1
Scope:
Open and sealed, physically
protected heat generator systems
with flow temperatures up to 100 °C.