SECTION 4 - NORMAL CYCLE

TABLE 4-1
VALVE ACTUATION OPERATION MODE
CYCLE PROCESSFILL SOLENOIDBELLOWS SOLENOIDDUMP SOLENOID
FILLOPENOPENOPEN
STERILIZECLOSEDCLOSEDCLOSED
VENT (>40 kPa)CLOSEDOPENCLOSED
VENT (40-20 kPa)OPENCLOSEDCLOSED
DUMP
20 kPa
CLOSEDOPENOPEN
OFFCLOSEDOPENCLOSED


SECTION 4 - VALIDATOR PLUS NORMAL CYCLE


After loading the Validator Plus, close the door, select the proper mode and depress "CLEAR/START." The unit will display the selected mode parameter for four seconds, after which it will display "FILL" as water runs in from the water reservoir.

After filling, the display will show the current temperature and pressure. The heater will turn on and off to start chamber heating and pressure build-up. Pressure should begin to build at 90 ° C.

Once the sterilization cycle begins, pressure controls the unit. (This differs from the older models of sterilizers, which are controlled by temperature).

The sterilization timer will be shown in the lower window, unless the operator has programmed the unit to show temperature during the sterilization instead of time, and will count down when the select temperature and pressure parameters are above their minimum values.

If stability problems occur, the timer will pause, since it only counts down when the selected temperature and pressure parameters are above their minimum values.

A "FAIL" alarm will occur if the cycle pauses more than three minutes because of temperature/pressure instability.

At the end of the sterilization time, the bellows solenoid opens to lower chamber pressure to 40 kPA. When the pressure reaches 40 kPa, the bellows solenoid will close, the fill/vent solenoid will open, and the remaining water will be extracted from the chamber.

This process continues until the pressure reaches 20 kPa, at which time the fill/vent solenoid will close and the bellows solenoid will reopen along with the dump solenoid, to rapidly vent the remaining pressure.

(The "LIQUIDS" cycle is an exception. This cycle cools down without venting to prevent the liquids from boiling over from a sudden pressure drop)

At this point, the drying cycle begins. A nominal 30-minute drying cycle is pre-programmed to provide adequate drying for a fully loaded Validator Plus (with the door closed).

If the door is opened, loadws will dry in less time. To start another load, depress "CLEAR/START" to return to the standby mode and re-initiate the sterilization process.

The heaters will be turned off if the unit is allowed to complete the full 30-minute drying without opening the door. The dipaly will read "END."

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