Please review (for reference) the “Protected Enclosure Criteria” and the
“Enclosure Connection Requirements” on pages 3 & 4 of the Model
YZ101 Operating Manual.
Refer to Model YZ101 Installation & Operating Manual for Unit Tubing
Instructions, requirements, and restrictions.
Refer to Operation & Safety Instructions for the Vortex Cooler for
Compressed Air Supply, Maintenance, Installation requirements, and
general information.
Vortex air inlet (3/8”) fitting.
For your reference we have included the booklet for the Model YZ101 Purge Unit. For more in-depth
information you may reference NFPA 496 – Standard for Purged and Pressurized Enclosures for Electrical
Equipment.
Please follow the steps below to set up and operate the CL1/CL2 z-purge enclosures.
BEFORE applying power to enclosure, Class I installations require four (4) volume exchanges through the
protected enclosure while maintaining a positive pressure. Follow this procedure each time before power is
switched on. If you have any questions contact DOD Technologies, INC before proceeding.
NOTE: The Purge supply should be of “Instrument Quality” air, free from any oils, dirt, and liquid(s). Inert gas
can substitute for “Instrument Quality” air as a Purge supply.
CAUTION: This procedure should only be used after the unit is properly installed and the supply of Purge air
(or inert gas) is connected properly to both the Vortex Cooler and the Purge Unit.
1. With Enclosure power off, remove any dust from enclosure (Class II applications).
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