We discussed about how to place and where place condensing unit & evaporator and cold room and wiring control box,because good manage pipe system and get best oil return and freon return.this is very important. sometimes even best machinery but not good pipe management,it still have many questions after cold room running. please note oil return is really very important for all refrigeration system.all good pipe management all service for oil return.
 

Now let us go on talking about cold room operation manual and what we should be careful when install a cold room.
 

1、 In order to reduce troubles of the system, please operate it in accordance with the requirements
2 、The design of the refrigerating system should help to reduce the on and off frequency of the compressor. The control elements chosen should be accurate, sensitive and reliable. When install the equipment, the temperature control, pressure control and time delayer must be adjusted to insure the on and off frequency, less than 6 times in an hour; each running time should be longer than 5 min, and each stop, no less than 3 min .
3 、The refrigerating cycle system must be cleaned and dried, without any organic compounds, metal impurities, detergent or acid matters and water content.
4 、The ratio of un-coagulated gas in the system should be less than 2%. Before charging freon, make a vacuum to absolute pressure below 10mmHg.
5、 The cooling oil is charged before delivery . The oil level declines because part of it has gone to the cycle system after running the machine. Replenish some oil to ensure that the oil level is not below the “Low Line”( The best value of oil level is half of oil gauge to the top). Please replace the cooling oil according to the dirtiness of the oil. Normally change it after the first operating month, later on replace it every year.
6、All valves must be open before starting it up.
7、The compressor should be started up after getting a balance between the suction pressure and the discharge pressure. The balance pressure should be less than 13kgf/cm2. If the balance between the suction pressure and the discharge pressure can not be achieved, however, the pressure difference is less than 5kgf/cm2, it can also be started up.
8、The normal running voltage of the compressor is 342-418V(three- phrase), 198-242V(single-phase) . The lowest start-up voltage must be above 312V (three- phrase),198V(single-phase).
9、The unit has been dried through vacuum treatment and nitrogen charging before delivery, fix the unit to the cooling system as soon as possible, after opening the package to prevent the internal parts form corroding.
10、It is not allowed to use the compressor to make vacuum for the system, after fixing the unit to the system.
11、In order to prevent the compressor from overheating, it is prohibited to use back-heat mode of combining the suction pipe and the liquid-feeding pipe together when using this series of compressors.
12、It is not allowed in principle to use the evaporator of pipe-array for the compressing & condensing unit. If it is necessary to use the evaporator of pipe-array in some special cases, the inside of the pipe must be clean and without water, grease and matters of acid/alkali nature.
13、It is necessary to install an oil heater to the compressor, it shall be activated to heat the lubricant to avoid the refrigerant from moving when the power source is cut off from the compressor.
14、In order to ensure safe operation of the unit, it is also necessary to install a discharging heat protector .
 

So if you still have any other question or need more information,please feel free to contact us soon.
 

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