Thermal Dynamics Pak Master 75XL Plus, Service Manual

Page: 41 / 74

Manual 0-2747 5-7 REPLACEMENT PROCEDURES
C. Optional Two Stage Air Line Filter
Replacement
This part is an option: it may not be installed on all units.
1. Remove power from power supply.
2. Shut off air supply and bleed down system.
WARNING
Always turn off the air supply and bleed the system
before disassembling the Filter Assembly as injury
could result.
3. Loosen the two bolts on the top of the Filter Assem-
bly enough to allow the Filter Elements to move
freely.
4. Note the location and orientation of the old Filter
Elements.
5. Slide out the old Filter Elements.
First & Second
Stage
Cartridges
(as marked)
A-02942
Optional Two-Stage Air Filter
6. Slide the replacement Filter Elements into the Filter
Assembly, with the same orientation as noted in
Step 4 above.
7. Hand tighten the two bolts evenly, then torque each
bolt to 20 - 30 in-lbs (2.3 - 3.4 Nm).
8. Slowly apply air pressure to the assembly, check-
ing for leaks.
D. Pressure Switch Replacement
1. Remove power from power supply.
2. Shut off air supply and bleed down system.
3. Remove the Right Side Panel per Section 5.04-C.
4. Disconnect the two wires connected to the Pres-
sure Switch Assembly.
5. Remove the assembly from the T-fitting.
6. Install the replacement Pressure Switch Assembly
by reversing the above procedure.
• Apply pipe thread sealant to the fitting before
reassembling.
NOTE
Do Not use Teflon tape as a thread sealer as small
particles of the tape may break off and block the
small gas passages in the torch.
E. Solenoid Valve Replacement
1. Remove power from power supply.
2. Shut off air supply and bleed down system.
3. Remove the Right Side Panel per Section 5.04-C.
4. Disconnect the two wires connected to the Pres-
sure Switch Assembly.
5. Disconnect the two wires connected to the Sole-
noid Valve Assembly.
6. Disconnect the gas tube connected to the bottom of
the T-fitting.
7. Remove the T-fitting and gas fitting from the Sole-
noid Valve Assembly.
8. Remove the Solenoid Valve Assembly from the
straight brass fitting.
9. Install the replacement Solenoid Valve Assembly
by reversing the above procedure.
F. Air Line Regulator Bracket Replacement
1. Remove power from power supply.
2. Shut off air supply and bleed down system.
3. Disconnect the gas input hose from the input of the
Air Line Regulator Assembly.
4. Remove the nut securing the Air Line Regulator to
the mounting bracket.