SES 2000 Vac (LS3) AUTOCLAVE Part 3
ST-SM45g Page 25 of 53
PART 3 MAINTENANCE
m Set microswitch actuator lever (5) by closing the
door and inserting a 0.125mm shim between switch
body and head of striker screw (6). Turn door knob
to lock door. Adjust striker screw (6) until screw
head touches shim and tighten locking nut.
n Open door to remove shim, then close door and
check that microswitch (10) operates correctly.
Solenoid Door Lock (Fig. 2.4, item 12)
13 Maintenance procedures will depend upon whether
the malfunction is mechanical (e.g. bolt or return spring
sticking) or due to solenoid unit failure. Proceed as
follows:
a To remove locking bolt, compress the spring with a
suitable spring compressor and open the autoclave
door to provide access to the slotted bolt-head
screw.
b Grip the solenoid plunger, forward of the E-clip, and
insert a screwdriver in the slot of the locking bolt
head to remove the locking bolt.
c Before refitting the locking bolt apply a little threadlock
(Part No.306234) to the thread of the solenoid
plunger.
d Refit the nylon washer in the correct position.
e To remove the solenoid unit, proceed as in (b) and
(c) and detach the electrical connector from the
solenoid coil, then remove the solenoid bracket
fixing screws from the chamber head ring. Fit
replacement solenoid unit by reversing the removal
procedure.
Chamber Temperature Sensors (Fig. 2.4, item 16)
14 Remove cable-tie then loosen 14mm nut on chamber
fitting and slide the clamp plate complete with spring,
sensor pocket, and temperature sensors clear of the
chamber fitting. Remove temperature sensors from the
sensor pocket. When removing the temperature sensors,
carefully note the position of the connectors on the control
board and then disconnect them. When fitting a new unit,
coat sensors and sensor pocket with a thin layer of heat
sink compound (Part No.605092), and ensure that the
assembly is free of dirt and grit.
Note: When a new temperature sensor is fitted, the
autoclave must be re-calibrated (see Calibration Procedure
para.57 onwards).
Solenoid Valves (Fig. 2.3, items 1, 2 , 3, 4 and 5)
Valve Maintenance Note
(a) If the valve assemblies are to be dismantled into
their component parts, make sure that:
(i) Careful note is taken of the connections, and of
the alignment and angles of components and pipes
relative to the valve, to ensure correct re-assembly.
(ii) Connections are not overtightened.
CAUTION
Do not misplace the small internal springs in
the sealing plunger.
(b) All valves on the vacuum autoclave have 14 Watt
coils and are not interchangeable with valves on
other autoclaves.
(c) The two electrical connections to the solenoid valves
can be made either way round.
Vacuum, Steam Bleed, and Water Discharge Solenoid
Valves (Fig. 2.3, items 1, 2 and 3)
15 To remove and replace valves, proceed as follows:
a Disconnect electrical connections from valve and
release plumbing connections at each side.
b Note carefully the orientation of the valve parts to
ensure correct reconnection. Connection identified
as '2' on valve body should always be connected to
the chamber side.
c Remove pipework from valve, then remove the
valve.
Note: On discharge valve remove the securing screws.
d Examine the valve. If only the valve coil has failed
(e.g. short-circuiting) it can be renewed. The valve
can also be dismantled and cleaned, see Note
preceding para 15.
e Fit new or repaired valve in the same way as the
original one, making connections as noted in (15b).
Air-Inlet Solenoid Valve Assembly (Fig. 2.3 item 5)
16 The air-inlet solenoid valve is removed and refitted
as an assembly as follows:
a Disconnect the two electrical connections to the
valve.
b Support the valve, and undo 1/4 x 5/16 BSPT stud
coupling nut 'A' (Fig.2.3).
c Withdraw valve assembly, and remove the silicon
tube connecting the valve to the bacterial filter.
d Remove the valve assembly from the autoclave.
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