Mocom B CLASSIC - 5.2 MANIFOLD

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EN
B CLASSIC / B FUTURA / S CLASSIC - TECHNICAL MANUAL
TECHNICAL DATASHEET
5.2 TECHNICAL DATASHEET ST02 - MANIFOLD
The MANIFOLD is installed on all “B CLASSIC/FUTURA” models. It is found on the left side of the chamber and is
easily accessed after removing the left side panel. There are two screws that secure it to autoclave bottom and are
accessible from above.
For maintenance purposes, the MANIFOLD can be removed from inside the autoclave because it can be displaced with
no need to disconnect its connection cables and the wiring of solenoid valves.
WARNING:
Power off the autoclave and disconnect the power mains cord before removing the side covers.
The solenoid valves feature 24Vdc class-H coils suitable for temperatures up to 150°C
Power supply to solenoid valves is electronically controlled and provides 24Vdc inrush voltage; power supply is redu-
ced to 16Vdc during regular operation.
Connections are made with one common (black) wire and a specic wire for each individual solenoid valve; note the
colour of the specic wire before disconnecting any wires.
The ve solenoid valves are clearly identied with their corresponding numbers stamped on the read end of the MANI-
FOLD, close to each valve. EV1 and EV3 control steam discharge from the chamber and feature stainless steel seat.
FUNCTIONAL CHARACTERISTICS OF SOLENOID VALVES
- EV1 2-way, normally open NO
- EV2/EV3/EV5 2-way, normally closed NC
- EV4 3-way
In the event of a black-out, EV1-NO restores pressure balance in the chamber to that the door can be opened manually.
OPERATION
EV1 NO is connected to the top drain of the chamber; it controls steam discharge during the pressure release phases
(vacuum pulses, cycle end, drying pulses). It is powered on (closed) during all chamber pressure maintenance phases.
EV2 NC is connected to the MANIFOLD lter. It controls the supply of air at atmospheric pressure into the circuit out-
side the chamber, and prevents pressure to reach negative values which could otherwise lead to starting problems with
the vacuum pump.
EV3 NC is connected to the bottom drain of the chamber (chamber lter) and controls condensate discharge during
pressure release phases.
EV4 3-way is connected to heat exchanger, vacuum pump and drain tank; it controls the direct discharge of condensed
steam to the tank; when chamber pressure drops to P=0.10 bar, it directs the outlet ow from the heat exchanger to
the vacuum pump.
EV5 NC is connected to the bacteriological lter and controls the ow of ltered air to the chamber during the balancing
phase at cycle end; the ltered air ow is conveyed to the chamber through the seat of EV1, which is closed during the
pressure balancing phase.
SERVICE OPERATIONS
Each solenoid valve can maintained individually to:
- Check and clean solenoid valve seat.
- Check and clean cursor.
- Change the complete cursor/cursor holder assembly.
For solenoid valves EV1 – EV2 – EV3 – EV5, proceed as follows:
- Disconnect the power supply wiring (2 wires) from the coil; make sure to note the colour of the 2 wires.
- Unscrew the coil retaining nut.
- Withdraw the coil from the cursor holder assembly.
- Unscrew the cursor holder assembly using a hexagon key; do not apply any tools to the cylindrical body of the cur-
sor holder assembly.
To ret, begin by positioning the cursor holder assembly, fasten the coil and connect the wiring.