Tweco PakMaster 75XL Plus - Manual (Page 21)

Manual 0-2746 15 SECTION 3: INSTALLATION PROCEDURES
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 Pressure Regulator/
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. Locate the 1/4 NPT to #4 (6mm) hose barbed fitting
shipped inside the Torch Spare Parts Kit.
2. If an optional air line filter is to be installed, refer to
subsection D.
3. Install the barbed fitting as shown below.
4. Tighten the barbed fitting
5. Place an adjustable hose clamp(customer supplied),
1/4" (6.5mm) to 5/8" (15.9mm)) over the gas supply
hose.
Regulator/Filter
Assembly
1/4 NPT to #4 (6mm)
Hose Fitting
#4 (6mm) Gas
Supply Hose
Hose Clamp
A-00916
Figure 3-7 Gas Connection To Regulator/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 Regulator does have its
own filter, it is recommended the optional Dry Air Filter
or optional Two Stage Air Line Filter be installed for im-
proved filtering. Gas connections to optional filters are
shown in Figures 3-8 and 3-9 below.
A-02469
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 Dry Air
Filter Assembly
Two Stage Filter
Assembly
1/4 NPT to
#4 (6mm) Hose
Fitting
#4 (6mm) Gas
Supply Hose
Hose Clamp
A-00917
Figure 3-9 Gas Connection To Optional Two Stage
Filter Assembly