Designed to dissipate high heat loads.Server rooms operate 24 hours a day, seven days a week, 365 days a year. CRAC units are designed to operate continuously, non-stop. Offer redundancy and ensure minimal downtime. Provide very high sensible heat ratio (SHR) - 0.85 to 0.95. Equipped with microprocessor based controls, which are sensitive and respond quickly to environment conditions. Regulate temperatures and humidity within tight limits; ±1°F and humidity at ±3 %.Provide up to six stages of cooling, using inverter compressors across multiple refrigeration circuits. Inverter compressors ramp up quickly, providing the energy necessary to achieve the cooling or heating demand of the zone. Then, working in tandem with system controls and sensors, the inverter compressor varies its speed to maintain the desired cooling level. Evaporators designed for high ΔT across the coil. (ΔT is the temperature difference between the return air and supply air temperature which by design is 16- 20° across the evaporator coil). Have the ability to control the humidity levels to the space. The units can add humidity with a humidifier that is built into theUnit. Excessive moisture in space is controlled by activating the cooling coil in cooling mode and activating blower to lower speed (variable frequency drive), to increase the air contact time to the cooling coil. The temperature difference between the air over the coil and the cooler coil temperature will wring out the moisture from the air. Operate at a high air flow rate from 500 to 600 CFM per ton or greater. The high volumetric rates are necessary to remove hot spots allowing more air through filters ensuring a cleaner environment.These units clean air continuously through the high efficiency air filters and the system design of the blower operating all of the time. There are different levels of efficiency for air filters, which are indicated by the MERV numbers. In general the higher the MERV number, the higher the efficiency.Some of the inherent efficiency features include:

1. Use of inverter driven compressors, which are low on energy consumption and provide excellent part load efficiency.
2. Use of variable speed fan along with multistage cooling. This improves the dehumidification process.
3. Use of hot gas reheat capability during the de-humidification process by utilizing heat energy that would normally be rejected outside by the condenser.