These units are designed to provide cooling, heating, and pressurization in one assembly.  Although separate pressurization and air conditioning units are still viable alternatives, they are being used less and less as more efficient combination units are sought out for new installations.  Combining the two systems into one unit has distinct advantages.

These advantages include: 

- Dehumidifying and pre-conditioning the pressurization air before it enters   

   the room prevents condensation and wide temperature swings,

- The unit is completely pre-wired,

- Less wall space is required than with a separate air conditioner and

   pressurizer, and,

- Installation time is faster.  

The WCPX (explosion proof air conditioner) and WHPX (explosion proof heat pump) series are CSA (C/US) certified for hazardous locations in sizes 1-1½ through 6 tons, and are available up to 20 tons.   In addition to the apropriate Class I, Division markings, units may additionally be marked with the US and Canadian Class I, Zone system upon request (example: Class I, Zone 2, group IIB+H2).

• The WCPX-G and WHPX-G series is specifically designed for switchgear buildings, MCC rooms, RIE buildings, control rooms, and similar buildings whose interiors will be declassified to an ordinary (non-hazardous) location by the pressurization and purge features of the unit.

• The WCPX-H and WHPX-H series is specifically designed for analyzer shelters and similar enclosures containing a source of flammable gas, vapor, or liquid and having limited, or no release of these materials under normal conditions (for more information, refer to NFPA 496, chapter 9).

IEC Zone 2 - The WCPF-G and WCPF-H series are similar to the WCPX except that they are designed for use in IEC Zone 2 hazardous areas. Although they do not bear the CE mark or A.T.E.X. certification as required for installation in the European Union, they are intended for use in other countries that prefer the IEC methods of protection.  The WCPF-G and WCPF-H series are certified to conform to Zone 2 requirements by Marc Climatic Controls and all applicable Certificates of Conformity will be provided for components.  These air conditioners are not for installation in North America.    

Fresh air stacks can be furnished in a guy-wire or free-standing style and includes a rain cap with bird screen.  Free-standing stacks can be furnished in either a welded pipe design or in a lighter weight, heavy gauge spiral pipe design.  Our free-standing stacks are made in 10 foot long (max.) sections and with heavy, seal-welded flanges at both ends.  The free-standing stacks are P.E. Certified for:

•  130 MPH winds - Free-standing spiral pipe design, up to 30 feet tall.
•  150 MPH winds - Free-standing welded pipe design, up to 30 feet tall.

Free-standing stacks must be properly secured at the base with anchor bolts in a concrete foundation or seal-welded to a structural steel support.

Packaged units and split systems are available in much greater cooling capacities. Systems are designed for Class I, Division 2 hazardous (classified) locations and to provide Type Z pressurization. Chemical filtration and redundant blowers can also be incorporated into the design.  All systems are capable of a black start.

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