kooltronic, inc. is proud to announce that its hazardous location (hl) series line of air conditioners has been granted a patent by the u.s. patent & trademark office (u.s. patent no. 9,157,670 b2). all electrical components are located in a sealed, pressurized compartment, representing a major advance in safety and reliability.

this design utilizes the electrical enclosure's existing purge system, and allows for general purpose components to be used, reducing both initial and service costs.

the characteristics of these units are:

• all models ul listed per ul 484, special purpose air conditioners
• all models ul recognized per nfpa 496: 2013, purged and pressurized enclosures for electrical equipment
• meets nec class i, division 1, groups a, b, c & d and class i, zone 1, groups iia, iib plus hydrogen and iic hazardous locations when used with an approved type x purge system on the electrical enclosure
• meets nec class i, division 2, groups a, b, c & d and class i, zone 2, groups iia, iib plus hydrogen and iic hazardous locations when used with an approved type z purge system on the electrical enclosure
• temperature classification is t-4, 275°f/135°c
• maintains nema type 12, 3r & 4/4x ratings per ul50, cabinets and boxes

the hazardous location series offers capacities up to 24,000 btu/h in single and 3-phase power. many features such as a programmable thermostat, compressor short cycling protector and hi/lo temperature alarm are standard. these units are offered at a lower cost and are easily maintained when compared to traditionally designed hazardous location units.

typical applications include oil refineries, paint and varnish manufacturing plants, petrochemical sites and hazardous materials storage sites. these stainless steel units are used where hazardous gases may be present, and are also suitable for corrosive environments.