Any air unit cooler operating with a coil refrigerant temperature below +32F (OC) is subject to the accumulation of frost or ice,and the continuous accumulating of this frost or ice will have a negative effect on the performance of the air unit cooler. Therefore, defrosting is required to restore the system to design efficiency.

Defrosting of air units is a state of the art developed in our industry by many years of experience. In central refrigeration systems there are four common methods of defrosting: air, electric, hot gas, and water. In order to have a successful defrost it is necessary to get the ice (frost) off of the air unit cooler coil to provide means to carry the defrosted ice (frost) away from the unit, and to complete the pefrost cycle without damage to the system equipment, meaning principally, the compressor.