Colmac Coil says it has helped pioneer the use of low-charge direct expansion in low-temperature industrial ammonia refrigeration applications.

According to the Colville, Wash.-based company, the new technology reduces the first cost of installation while significantly reducing the ammonia charge required on the site. As demonstrated in recent installations, using its ADX in industrial refrigeration systems produces additional benefits that include faster defrosting, effective operation at multiple temperature levels (convertible rooms), good response to changes in load, fast restart after power failure, and simplified maintenance and operation through elimination of recirculation pumps.

Because of the reduced ammonia charge on site and in the occupied spaces, regulatory burdens can be reduced and workspaces made safer. The technology is being successfully used around the world in locations including Illinois, Texas, Utah and Australia. Additional facilities are also under development.