Thermal Dynamics PCH-100XL, Instruction Manual

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Manual 0-2583 15 INSTALLATION PROCEDURES
C. Filtering
An inline pneumatic dryer/evaporator type air filter,
capable of filtering to at least 5 microns, is required
when using air from a compressor. This type filter
will insure that moisture, oil, dirt, chips, rust particles,
and other contminants from the supply hose do not
enter the torch. For highly automated applications, a
refrigerated drier may be used.
NOTE
Do not use an air line filter with high pressure gas
cylinders.