Pressure Release Routine; Boiler Pressure Check - WMF espresso Service Manual

Maintenance concept
3.4

Pressure release routine

Before working on the boiler system, the on-screen guided pressure release routine must be carried out.
This is for your own safety, because if the pressure in the steam boiler is not relieved, various lines and
valves will be under up to 1.5 bar of pressure. As soon as the routine starts, the system pressure is relieved
via the hot water spout (pressure relief can be tracked on the display and the manometer in the front
panel). Once the pressure relief routine has been completed, the residual pressure can be read on the dis-
play (see Fig. 1) or the pressure manometer on the front panel. The Valve button (see Fig. 1) can be used to
actuate the Auto-steam valve and boiler pressure relief valve for 3 sec. in order to discharge any remain-
ing pressure. Before opening the machine, disconnect it from the power supply. This will prevent uninten-
tional pressure discharge.
Service > Service routines > Pressure release steam boiler
3.5

Boiler pressure check

The boiler pressure check must be performed as part of the "Every 2 years" service maintenance.
Service > Service routines > Boiler pressure check
The boiler pressure check has made the previous boiler inspection to be performed every 2 years much simpler, as the boiler insulation no longer needs to be re-
moved for this purpose. The boiler pressure check must be performed using the "WMF test fittings". These test fittings include detailed instructions for performing
the boiler pressure check. If the boiler pressure check fails, after it has been ensured that there are no other leaks, then the steam boiler must be replaced and the
steam boiler pressure check must be started again.
Important note for technicians on the pressure relief routine and boiler pressure check:
In general, components of the boiler water and steam system must be open very slowly and carefully.
 Do not cut off any hoses or open screwed connections quickly, and always listen for the noise of escaping steam.
If the pressure release routine was performed, the heater will remain deactivated until machine is switched off and switched on again. After switching on again,
a query appears as to whether the machine should be started up with or without heating up.
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Illustration 1