Guardian DP33 NEMA 12, 3R & 4Air-Cooled Panel-Mounted Air Conditioners

The Guardian DP33 is a NEMA 12, 3R & 4 air-cooled panel-mounted air conditioner designed to maintain precise temperature control and protection for sensitive electronic equipment housed in industrial enclosures. Built with a heavy-duty steel shell finished in baked powder coating that meets ANSI 61 gray standards, this unit provides robust corrosion resistance in demanding environments, with custom color options available upon request. The fully gasketed construction ensures tight, leakproof installation that maintains full NEMA Type 4 compliance for superior protection against moisture and contaminants.

The DP33 employs a closed-loop cooling system that isolates the enclosure interior airflow from external ambient conditions, preventing unconditioned air from compromising the cool, dehumidified compartment where sensitive components operate. A built-in condensate evaporator eliminates the need for manual drainage under normal operating conditions, with overflow drain fittings and hose included for additional safety in high-humidity applications. The unit utilizes CFC-free R134a refrigerant for environmentally responsible operation, while epoxy-coated condenser and evaporator coils withstand up to 1000 hours of salt spray exposure per ASTM B 117 testing, offering extended durability in corrosive environments.

Advanced control features include a programmable thermostat and temperature alarm that enable precise enclosure climate management and early-warning alerts, along with a compressor short cycle protector that extends compressor life by preventing frequent restart cycles during low heat loads or power interruptions. An intelligent condenser impeller speed controller modulates fan performance based on coil temperature, reducing noise, cycling frequency, and the risk of freeze-up. The unit incorporates multi-layer corrugated aluminum filtration to keep internal components clean, with replacement filters readily available. A six-foot three-wire power cord is standard, and the Guardian DP33 carries UL/CUL listing and CE compliance for worldwide installation confidence.