Descaling - Preliminary - WMF espresso Service Manual

Maintenance concept
3.3

Descaling - Preliminary

Because the software sequence and the amount of boiler descaler have not yet been 100% defined, it is rec-
ommended to run the descaling operation 2 times if the machine has heavy scaling. For this reason, descaling is
labeled as preliminary.
The flow heater and the steam boiler are descaled using two separate, display-guided descaling routines.
Brief description of the display-guided descaling routine:
 Start the descaling routine

Continue to follow the instructions on the display
 The steam boiler pressure is relieved through the hot water spout
 Load the descaling agent (Dissolve 100 g of the boiler descaler in 1 liter of water at
about 50°C)
 Close water tap
 Pressure reduction water infeed running
 Remove the drip grid and drip tray
 Remove sheet metal cover (see illustration 1)
 Place the hose from the descaling pump on the connection nipple (see piping diagram excerpt)
 Reinsert the drip tray and replace the steam plate (SteamJet)
 Place the drain tube (00.0048.0041 – 290 mm) over the HW spout (splash protection)
Important note for technicians for descaling:
Because the espresso pump is not self-priming, and therefore the connecting line must be filled manually in
order to start descaling, the descaling pump (familiar from the bistro!) is used.
The plug connector for this connection is located behind the metal cover, in the rear
rear part of the drip tray.
Important notes for technicians:
When connecting the descaling pump to the connection nipple, make sure that the SteamJet hose is not pulled out
of the SteamJet receptacle.
Illustration 1 – Descaling pump connection
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