Associated Environmental Systems FD-408

The refrigeration system of these test chambers are either conventional single stage systems or two stage cascade systems. All of the chambers are designed to satisfy both military and commercial requirements standard to industries performing low temperature test programs.

The single stage unit consists of a single compressor and single refrigerant. Associated uses a single stage system on all standard and custom designed chambers requiring a low temperature limit of -35°F/-37°C.

The two stage cascade system, as its name implies, cascades the refrigeration effect of the high temperature stage to extract heat from the low temperature stage. The cascade system consists of two separate closed refrigerant circuits, each using a different refrigerant, each with its own compressor. This type of refrigeration system is used on all standard and custom chambers requiring a controlled low temperature limit of -100°F/-73°C.