DE DIETRICH INNOVENS MCA 25_28 BIC - Manual (Page 32)

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
5. Checking and maintenance MCA 25/28 BIC
31 31/08/2011 - 300024163-001-B