Weak current College】 【refrigeration system is running in normal mode and run adjustment.

<br> <br> First, the refrigeration system is running in normal operating mode: <br> 1. compressor suction temperature higher than evaporation temperature should be 5-15 ¡ .æ; <br> 2, the compressor discharge temperature maximum R12 system shall not exceed 130 ℃, R22 system shall not exceed 150 ° c; <br> 3. compressor crankcase oil temperature of maximum may not exceed 70 ° c; <br> .4. compressor suction pressure should correspond with the evaporation pressure; <br> 5. compressor discharge pressure R12 system maximum may not exceed 1.2MPa, R22 systems exceed 1.6MPa; <br> 6, compressor oil pressure ratio inspiratory pressure 0.12-0.3MPa .; <br> 7, often note cooling water and the water temperature, condenser water temperature should be higher than the inlet water temperature of 2-5 ℃ is appropriate; <br> 8, often note compressor crankcase oil and oil separator oil return; .<br> 9, compressor, there should be no rap, body heating should be normal; ministries <br> 10, condensing pressure shall not exceed the compressor discharge pressure range. <br> Second, the refrigeration system operation adjustment: <br> .Expansion valve is the largest component of the refrigeration system is that regulation and control of refrigerant flow and pressure enters the evaporator of important device, but also high-voltage side of the "boundary". It's adjustable, not only related to the refrigeration system can .function properly, but also measure the operator symbol technology level. For example, measuring the refrigerator temperature is-10 ° c evaporation temperature lower than refrigerator temperature 5 ° c, ie-15 ℃, control the refrigerant temperature pressure chart "(to R12 refrigerants ., for example), corresponding to the pressure gauge for 0.23MPa, this pressure is the expansion valve adjustment pressure (export). Because the pipeline pressure and temperature loss (depending on the length of the pipeline and insulation effect), the suction temperature evaporation .temperature higher than 5-10 ° c, relative to the suction pressure should be 0.66 ~ 0.23MPa gauge pressure. Adjust the expansion valve must carefully patiently, adjust the pressure to go through the evaporator and the Treasury have heat boiling temperature (evaporation) before .entering the compressor suction through the pipeline to the cavity pressure gauge on the need for a time. Each mobilization expansion valve, normally takes 15-30 minutes to the expansion valve adjustment pressure stability in inspiratory pressure gauge. Compressor suction pressure is the expansion valve adjustment .pressure of important reference parameters. Expansion valve opening is small, the flow of the refrigerant through the small, low pressure; expansion valve to open degree, the flow of the refrigerant through the many high pressure. According to the refrigerant pressure of thermodynamic properties, .the lower the temperatures correspond; the lower the pressure rises, the temperature also corresponds to. According to this law, if the expansion valve outlet pressure too low, the evaporation pressure and temperature is too low. But due to the reduction of evaporator flow, .pressure to reduce, resulting in slower evaporation, the unit volume (time) cooling capacity reduction, reducing the cooling efficiency. Conversely, if the expansion valve outlet pressure too high, the evaporation pressure and temperature is too high. Enters the evaporator flow and pressure .will increase, due to the liquid evaporates excess, tide gas (or liquid) are caused by inhalation of the compressor, the compressor's wet-stroke (hydraulic hammer), the compressor is not working properly, resulting in a series of working poor, and .even damage to the compressor. Thus, the correct adjustment of the expansion valve on systems running is very important. <br> To decrease the expansion valve adjustment of pressure and temperature when the losses, expansion valve as installed in the entrance from the freezer in .a horizontal pipe, the sensor should be wrapped in back to the trachea (low) side of the central location. Expansion valve in the typical body frosting is oblique, entrance side should not be frosting should be regarded as entry filters exist or dirty up ice .jam. Normally, expansion valve work is very quiet, if you make a clear sound "silk", explains the refrigerant in the system. Occurs when the expansion valve sensor system leakage, adjustment disorder, and other failures should be replaced. <br> .(1) compressor exhaust temperature is too high: <br> 1, suction pressure is too low, suction pressure differential is too large (cylinder compression ratio), expansion valve opening small, adjust the pressure is low; <br> 2, suction .temperature is too high, that is, suction superheat, suction pipe is too long or poor insulation; <br> 3, cooling water or water temperature is too high; <br> 4, the system of Non-Condensable gases (air) excessive .; <br> 5, condensing pressure is too high, the corresponding condensing temperature too high, causing high discharge temperature; <br> 6, compressor cylinder or valve failure. <br> (2) of the compressor discharge pressure too high: < .br> 1, the system of Non-Condensable gases (air) excessive; <br> 2. insufficient cooling water or water temperature is too high; <br> 3, the condenser is too dirty, too much fouling; <br> 4 ., the refrigerant in the system. <br> (3) compressor oil temperature is too high: <br> 1. compressor suction air temperature through high; <br> 2, lubricating oil is too dirty or oily too bad; <br> .3. compressor abrasion. <br> (4) condensing pressure and condensing temperature is too high: <br> 1, condenser cooling water or water temperature is too high; <br> 2, the condenser is too dirty, too much fouling; .<br> 3, the system of Non-Condensable gases (air) excessive; <br> 4. too much refrigerant in the system; <br> 5, condenser heat transfer surface area configuration is too small. <br> Regular checking and .mastering the refrigeration system operating conditions, exclude operation breakdown, ready to eliminate irregularities, carefully adjust the system in the best State on refrigeration system can run normal economic security are crucial, is the operator of the technical quality and sense of fundamental standards. <br .> <br> <br> <br>.