Centrometal CentroPelet ZS Serie Manual Del Usuario página 38

6.2 Cleaning of the "T" fitting glass (to be carried out at least twice a year, starting at mid
winter season)
Lift the lid at the left of the
combustion chamber.
Turn the ash collection glass.
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Unscrew the two retaining screws
of the heater front.
Clean up the glass from the residues
accumulated during the heater
operation
Lift the heater front to release the "T"
fitting containing compartment.