1 microcomputer control panels, PID digital temperature settings and temperature display, with a maximum temperature and minimum temperature control delay protection 2 high-efficiency shell and tube condenser, excellent conductivity, greatly enhance the cooling rate, saving energy. 3 high efficiency shell and tube evaporator, long service life, ensure good water quality. 4 chillers using U.S. Copeland, Sanyo compressor, built-in safety protection, low noise, energy saving and durable. 5 high-pressure safety switch, overload protection, over-temperature safety protection and frost protection switch.