Application 1:
An air conditioning system with dual pressurization was required for a large analyzer shelter with a high interior heat load and limited wall space.

A 10 ton vertical packaged air conditioner was designed with dual blowers and for close coupling to the analyzer shelter. A seven-day automatic timer was included in the control panel to allow equal running time on each blower.

The system was rated Class I, Division 2, Groups C, D.

Application 2:
Analyzer shelters destined for South America required an I.E.C. Zone 2 flameproof rating. Heating, cooling, and fresh air make-up were required.

Two-ton model WCBF023 air conditioners were manufactured to comply with I.E.C. standards. Flameproof motors with "de" type protection were used for the evaporator and condenser sections. The controls enclosure had type "d" protection and the thermostats were provided with intrinsic safety protection.

Certified flameproof heaters mounted indoors and over the supply air discharge into the room completed the installation.

A certificate of compliance, although not required for Zone 2, was provided by a third party inspection agency.  Certificates of Conformity were provided on all rated component parts.

Application 3:
Wall space was at a premium for this analyzer shelter. Heating, cooling, and ventilation was needed and two air conditioners were requested for redundancy.

Two wall mount air conditioners with built-in division 2 electric heat and an explosion proof control panel were provided. The units were ducted together with a common fresh air intake and back-draft dampers. The controls were arranged to provide first and second staging with a manual selector to alternate between the two units.

Application 4:
An analyzer building was to be installed in a highly corrosive, hazardous atmosphere and the building was specified to be constructed of glass fiber reinforced concrete.

A Class I, Division 2, WCBX series wall mount air conditioner was manufactured in stainless steel with Marc's urethane coating on coils, tubing, compressor, motors, and other items not constructed in stainless.

A WSFX-DB series dual wall mount supply fan with stainless steel cabinet was furnished to provide continuous ventilation with one fan running and the second fan in the standby mode.

To secure the air conditioner and fan to the concrete building, Marc furnished mounting frames for precasting into the building walls.

The air conditioner in the picture at right has a service panel removed for power wiring during installation.

Application 5:
A free-standing and fully redundant system was required as the customer had no wall space for two air conditioners and preferred to install the air conditioning system separately from the analyzer shelter. 

Custom 5 and 10 Ton Packaged Units were designed and furnished to provide dual air conditioning and ventilation systems in a single cabinet. 

Each unit included gas-phase air filtration, dehumidification, humidifiers, dual ventilation blowers, and 100 percent redundant air conditioning and heating systems.  Two explosion proof disconnects were installed on each cabinet.  With dual built-in control sections, each unit was provided with a separate thermostatic control panel for mounting inside the shelter. 

In addition, each unit received a complete corrosion coating to include coils, tubing, cabinet, etc.  The cabinet was painted in accordance with the customer's color specification.

Each unit was CSA certified for Class I, Division 2, Groups, B,C,D hazardous locations.