Part 3
SES 2000 Vac (LS3) AUTOCLAVE
Page 26 of 53
ST-SM45g
PART 3 MAINTENANCE
Heating Element (Fig. 2.4, item 1)
18
To replace heating element, proceed as follows:
a Remove electrical connections from element
terminals.
b Remove sterilizing trays and tray carrier, and remove
element clamp from inside chamber, together with
heater thermostat sensor and clip.
c Unscrew and remove large nut from heater mounting
boss at rear of chamber.
d Withdraw heating element through chamber door.
CAUTION
Avoid kinking the capillary tube.
e Fit replacement heating element by reversing order
of removal procedure.
CAUTION
Ensure that the Manual reset cut-out sensor is
correctly positioned, see details para.36 .
Note: Ensure element is horizontal when fitted. Also
ensure that a new sealing washer is used and that the nut
is fully tightened, to avoid leaks.
Door Seal (Fig. 2.2, item 9)
19
Open chamber door and remove central aerotight
nut, stainless steel washer, seal retaining ring and seal
retaining disk. Remove door seal from seal retaining
disk. When fitting a new door seal ensure that it is
correctly seated on seal retaining disk and that aerotight
nut is tight.
Vacuum Pump (Fig. 2.3, item 7)
20
The vacuum pump (diaphragm type) fitted to most
autoclaves is illustrated in Fig. 2.3, item 7. The piston
pump illustrated in Fig. 3.6 is no longer available. The
diaphragm pump can be refurbished (see para.38). To
remove and replace a diaphragm pump proceed as
detailed in the section that follows.
Note: If the piston pump (see Fig. 3.6) is fitted to the
autoclave this should be replaced (if problems are
encountered) with a diaphragm pump. The kit (part number
111372) contains all the parts and fitting information
required to achieve this replacement.
Diaphragm pump (Fig. 2.3 item 7)
To remove and replace the old diaphragm vacuum pump,
proceed as follows:
a Disconnect electrical connection from vacuum pump.
e Examine the valve assembly. If only the coil has
failed it can be renewed. The valve can be also
dismantled and cleaned, see Note preceding para
15 and note:-
(i) The non-return valve is connected to the elbow
connection using PTFE tape (Part No.301600) make
sure that the tape does not cover the end of the non-
return valve.
(ii) The elbow connector is connected to port 1 of the
valve using hydraulic sealant (Part No.306234)
make sure that when it is fitted the non-return valve
is pointing vertically down.
(iii) The long, threaded end of the 1/4 x 5/16 male
stud coupling is connected to port 2 of the valve
using hydraulic sealant (Part No.306234) .
f
Refit a new, or a repaired valve assembly in reverse
removal sequence using a small quantity of Hellerine
oil (Part No.670170) to assist refitting silicon tube.
g Operate the autoclave using a 134°C with drying
cycle, to check that the solenoid valve assembly is
working correctly.
Water-Fill Solenoid Valve Assembly (Fig. 2.3 item 4)
17
The water-fill 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 the nut securing the 90°
elbow to the lower manifold of the chamber (Fig.
2.3).
c Withdraw the valve assembly, and undo the nut
connecting the nylon tube to the solenoid.
d Remove the valve assembly from the autoclave.
e Examine the valve assembly. If only the coil has
failed it can be renewed. The valve can be also
dismantled and cleaned, see Note preceding para.
15 and note:-
(i) The 90° elbow connector is connected to port 2 of
the valve using hydraulic sealant (Part No. 306234).
(ii) The 135° elbow connector is connected to port 1
of the valve using hydraulic sealant (Part
No. 306234).
f
Refit a new, or a repaired valve assembly in reverse
removal sequence.
g Operate the autoclave using a 134°C without drying
cycle, to check that the solenoid valve assembly is
working correctly.