About the Refrigeration System : The sea water flake ice machine uses a refrigeration system to cool the evaporator. Common refrigerants are environmental friendly gas, R404a, or R507a. or others depending on the design and intended use of the machine. Commercial Ice Bagging Machine, Aglucky Ice Maker Machine, Electric Ice Making Machine, Block Ice Machine Manufacturers,Professional Ice Making Machine. Ice Block/Block type: weight from 2kg to 150kg even bigger, Used for cooling purposes in industries such as fisheries, meat processing, and concrete cooling. The product will supply to all over the world, such as Europe, America, Australia,Adelaide, Cape Town,Ecuador, Liberia.3. check the Refrigeration System, before that pls check the pressure gauge to see if the pressure are in proper, if no gas there are leakage, once leakage are happens, pls check all the welding points and do the repair welding. if pressure are in order, pls also check the dryer filters, condenser fan and compressor for sure.