DE DIETRICH INNOVENS MCA 15 - MCA 25 - MCA 25_28 MI - Manual (Page 31)

4. Connect an evacuation hose to the plug located at the lowest
level. Place the end of the hose in a discharge sump or in a place
where the water discharged from the valve can not do any
damage.
5. Open the filling/draw-off valve on the heating system. Vent the
heating installation.
WARNING
The water may still be hot.
6. When no more water comes out of the drainage plug, close the
drainage valve.
T000858-A
MCA 15 - MCA 25 MCA 25/28 MI 5. Checking and maintenance
23/08/2011 - 300024159-001-B 30