Staged Chilled Water (SCG) R-410A large-capacity systems consist of two to six modules, and are available in capacities ranging from 48,000 (4 ton) to 1,080,000 (90 ton) BTU/hr. The marine-grade compressors come in single phase or three phase, 50 Hz or 60 Hz, and all standard voltages (208-460 VAC). Each condensing unit is monitored and protected with freeze controls, high limit switches, high and low aquastats, timers and on-board fuses or breakers. Cupronickel condenser coils provide high corrosion resistance. unique stainless-steel evaporator plates are designed for maximum efficiency of heat transfer. SCG systems can be built with the circulation pump mounted in the chiller frame. Frames are welded with marine-grade aluminum alloy, primed, then finished with a corrosion resistant epoxy. SCG systems can provide heat via reverse cycle or electric heating.