The EM Plus patented refrigeration system directly cools the compressed air. In contrast, thermal mass type dryers and other competitive models inefficiently use refrigerant to cool a mass, which in turn cools the compressed air. The time required to cool the media delays cooling of the compressed air, resulting in dew point spikes up to 60°F that last 30 minutes or longer, allowing extensive moisture carryover. When gylcol or sand absorbs heat, there is no latent heat involved. Therefore, the temperature and dew point must rise.

EMD Plus Series cycling refrigerated compressed air dryers use direct expansion cooling to prevent dew point spikes, an inherent problem for competitive models using a thermal mass design. In thermal mass dryers, a refrigerant is used to cool a mass. This mass is then used to cool the compressed air. The time required to cool the mass delays cooling of the compressed air, resulting in dew point spikes up to 60°F that last 30 minutes or longer. These dew point spikes allow for extensive moisture carryover throughout the system.

The EM PLUS maintains a constant dew point temperature because of its unique flooded evaporator design, which uses latent heat to keep temperature constant. The EM Plus Series dryers display the precise dew point temperature on the control panel to allow easy monitoring of dryer performance.