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SECTION 4
4.1 GENErAl
CAUTION
If this equipment does not operate properly, stop work
immediately and investigate the cause of the malfunction.
Maintenance work must be performed by an experienced
person, and electrical work by a trained electrician. Do
not permit untrained persons to inspect, clean, or repair
this equipment. Use only recommended replacement
parts.
WArNING
BE SUrE THAT THE WAll DISCONNECT SWITCH Or WAll
CIrCUIT BrEAKEr IS OPEN BEFOrE ATTEMPTING ANY IN-
SPECTION Or WOrK INSIDE OF THE PrEST-O-lITE 250.
4.2 INSPECTION AND ClEANING
Frequent inspection and cleaning of the Prest-O-Lite 250 is
recommended for safety and proper operation. Some sug-
gestions for inspecting and cleaning are as follows:
A.
Check work cable to workpiece connection.
B.
Check safety earth ground at workpiece and at power
source chassis.
C.
Check heat shield on torch. It should be replaced if
damaged.
D.
Check the torch electrode and cutting nozzle for wear
on a daily basis. Remove spatter or replace if neces-
sary.
E.
Make sure cable and hoses are not damaged or
kinked.
F.
Make sure all fittings and ground connections are
tight.
G.
With all input power disconnected, and wearing proper
eye and face protection, blow out the inside of the
Prest-O-Lite
®
250 using low-pressure dry compressed
air.
H.
Water or oil occasionally accumulates in the bowl of the
air pressure regulator. To drain bowl, turn machine off
with air supplied to the machine, then push upward
on the button located on the bottom of the bowl. See
Figure 4-1.
Air Pressure
Regulator Bowl
Button
Figure 4-1 Draining Bowl
4.3 FlOW SWITCH (FIGUrE 4-2)
When excessive contamination is found in the air, the flow
switch (FS) should be removed, disassembled and cleaned
as follows:
A.
Ensure the system is shut down and there is no trapped
air under pressure in the piping.
B.
Remove the piston plug.
C.
Remove the spring (FS-4 only). Use care when handling
spring to prevent distortion.
D.
Remove the piston.
E.
Clean all parts with cleaning agent.
Ensure cleaning agent does not contain solvents which
can degrade polysulfone. Warm water and detergent is
recommended for cleaning. Allow all parts to dry thor-
oughly before reassembly.
Reassemble the flow switch in reverse order.
SPRING
FLOW SWITCH
Figure 4-2 Disassembly / Assembly of Flow Switch
23
MAINTENANCE
NOTE
PISTON PLUG
PISTON
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