33
Insufficient steam alarm
This alarm indicates leakage of steam from chamber 09.
The alarm may appear during a cycle, when the suitable pressure needed to run a cycle is
not reached at a temperature of 114°C. Pressure is detected by transducer 38 and
temperature by chamber temperature probe 39.
• Check the efficiency and cleanliness of chamber seal 31 and of the flange of chamber
09 on which it is fitted. Replace if damaged.
If leakage of steam is found, adjust the door closing as shown in chapter DOOR
ADJUSTMENT.
• Check inclination of the steriliser again (see USE AND MAINTENANCE MANUAL, chapter
INSTALLATION).
• Check correct operation of pressure transducer 38 and temperature probe 39 using an
appropriate measuring tool.
• Check internal coil.
• Check that the total weight of the load is not exceeded (see USE AND MAINTENANCE
MANUAL, chapter OPERATING USE).
• If the alarm is not resolved after these checks, check drain solenoid valve EV2 (see
diagrams). This is connected to the chamber drain and is the first solenoid valve to
intercept the steam. For this reason, it might need to be replaced.
Replace the solenoid valve when time or number of cycles
shown in the Scheduled service table is exceeded (see USE AND
MAINTENANCE MANUAL, chapter MAINTENANCE). Proceed as
follows if cleaning is required:
- Remove the solenoid valve and keep track of the
sequence of parts in order to refit them correctly.
- Carefully clean the hole in the valve body (A).
- Carefully clean the core (B). The seal pushed by the
spring (C); should slide smoothly inside. Should the seal be
deformed, the valve will need to be replaced.
If the steam keeps leaking, pressurise the steriliser and locate the leak by following the
following practical procedure:
- Close the previously checked chamber door properly.
- Remove the cover from the steriliser.
- Energise the winding of solenoid valve EV2 (see wiring diagrams) with an external
power cable at 230V: it should be normally open NO.
- Remove one of the inspection plugs 40 and connect a compressor (2÷3 bars).
- Introduce compressed air and hold the chamber pressurised for approximately 15
minutes: locate the leakage by observing the unit.
• Check the pressure/temperature alignment during a cycle (see STERILISATION
TEMPERATURE BAND ALARMS).
• Run a VACUUM TEST to check for pressure losses.
Alarms
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