MAINTENANCE MANUAL
Mirage technical manual
page 32 of 65
Safety valve on steam boiler
If by any malfunction the heating element is not switched off when it should be, the temperature and
thus pressure inside the steam boiler will rise above it’s normal operating value. To avoid dangerous
situations, a safety valve is mounted on the steam boiler. This safety valve will open when pressure
exceeds 1.8 Bar.
When the safety valve on the steam/hot water boiler is malfunctioning it will open at a (much) lower
than operating pressure (1.35 Bar). When this occurs, the safety valve has to be replaced.
A malfunction of the safety valve is recognised by a continuous hissing sound. Pressure and thus
temperature cannot reach operational levels, the heater in the steam/hot water boiler is engaged
continuously and the boiler is filled automatically once in a while. (However, a malfunctioning anti-
vacuum valve leads to similar symptoms.)
The machine can remain operational when checking the safety valve for leakage. However, it must be
shut down and pressure from the boiler must be fully released before the safety valve can be
replaced.
Check safety valve
Materials needed
Allen key 3 mm
Procedure
1. Remove cup warmer.
2. Pull red drain hose from safety valve (see Figure M 10).
3. Check for leakage, the hose should be dry and should not show evidence for leakage (detrital
build-up) on the inside.
4. If necessary, replace safety valve (see below).
5. Remount hose.
6. Remount cup warmer.
Replace safety valve
Materials needed
Spanner 20 mm (2x)
Allen key 3 mm
Replacement safety valve
Loctite or Teflon tape
Procedure
1. Turn mains switch
to “0”.
2. Open the steam valves to let off steam, this will relieve the excess pressure in the steam/hot water
boiler.
3. In the meantime, remove cup warmer.
4. Pull red drain hose from the safety valve.
5. When pressure in boiler has dropped completely, remove the safety valve from the fitting in the
boiler with a 20 mm spanner, retain the fitting with a 20 mm spanner(see Figure M 14).
Note!
The valve is mounted with Loctite to ensure sealing, you may need a little extra torque to loosen it.
6. Clean inside threads of the fitting as well as possible.
