Tweco 75XL Plus PAK Master - Manuel (Page 23)

Manual 0-2807 3-5 INSTALLATION
B. Checking Air Quality
To test the quality of air, place the RUN/SET/LATCH
switch to SET position, place a welding filter lens in front
of the torch and turn on the gas. Any oil or moisture in
the air will be visible on the lens. Do not initiate an arc!
CAUTION
The air supply must be free of oil, moisture, and
other contaminants. Excessive oil and moisture
may cause double-arcing, rapid tip wear, or even
complete torch failure. Contaminants may cause
poor cutting performance and rapid electrode wear.
C. Gas Connections
The gas supply is connected to the Two Stage Air Line
Filter Assembly installed on the rear of the unit. The con-
nection is the same for compressed air or high pressure
gas cylinders.
Connect the gas supply as follows:
1. Connect the gas line to the Regulator / Filter As-
sembly inlet port as shown. The illustration shows
typical fittings as an example. Other fittings may
be used. Install the fittings and tighten.
NOTE
Supply hose must be at least #4 hose (1/4 in or 6
mm I.D.).
Two Stage Filter
Assembly
1/4 NPT to
#4 (6mm) Hose
Fitting
#4 (6mm) Gas
Supply Hose
Hose Clamp
A-02744
Figure 3-7 Gas Connection To Two Stage Filter
Assembly
D. Optional Air Line Filter Installation
Filtering is required when using air from a compressor to
insure that moisture and debris from the supply hose does
not enter the torch. Although the unit is standard with
the Two Stage Air Filter there is an Optional Single-Stage
Filter Assembly that may be used. Install the Optional
Single-Stage Filter as follows:
1. Connect the gas line to the Regulator / Filter As-
sembly inlet port as shown. The illustration shows
typical fittings as an example. Other fittings may
be used. Install the fittings and tighten.
NOTE
Supply hose must be at least #4 hose (1/4 in or 6
mm I.D.).
A-02753
1/4 NPT to
#4 (6mm)
Hose Fitting
Dry Air Filter
Assembly
#4 (6mm)
Gas Supply
Hose
Hose Clamp
Figure 3-8 Gas Connection to Optional Single-Stage
Filter Assembly
E. Using High Pressure Gas Cylinders
Refer to the following when using high pressure gas cyl-
inders as the gas supply: