Cold storage equipment common 16 faults and treatment methods

1, refrigerant leakage
Failure Analysis] Refrigerant leakage in the system, the cooling capacity is insufficient, suction and discharge pressure is low, the expansion valve can be heard than usual much larger than the intermittent "squeak" airflow sound. The evaporator does not hang frost or hang a small amount of floating frost, if you adjust the expansion valve hole, suction pressure is still no big change. After stopping the machine, the balance pressure in the system is generally lower than the saturation pressure corresponding to the same ambient temperature.
After the refrigerant leakage, can not rush to the system to charge the refrigerant, but should immediately find the leakage point, after repair and then charge the refrigerant.
2, too much refrigerant charging after maintenance
[Failure Analysis] maintenance of the refrigeration system charged with refrigerant more than the capacity of the system, the refrigerant will take up a certain volume of the condenser, reduce the heat dissipation area, so that its refrigeration efficiency is reduced, suction and discharge pressure is generally higher than the normal pressure value, the evaporator frost is not solid, the library is slow to cool down.
[Exclusion method] according to the operating procedures, shall be shut down for a few minutes after the high-pressure shut-off valve at the release of excess refrigerant, at this time can also be the residual air in the system and put out.
3, air in the refrigeration system
[Failure Analysis] air in the refrigeration system will reduce refrigeration efficiency, the prominent phenomenon is the suction and discharge pressure increases (but the discharge pressure has not exceeded the rated value), the compressor outlet to the condenser inlet temperature increases significantly due to the air in the system, the discharge pressure, the discharge temperature is increased, this article from refrigeration Encyclopedia of WeChat public number.
[Exclusion method] can be a few minutes after the shutdown, several consecutive times from the high-pressure shut-off valve to release the air, but also according to the actual situation of the appropriate charging of some refrigerant.
4, low compressor efficiency
[Failure Analysis] Refrigeration compressor efficiency is low in the case of the same working conditions, the actual exhaust volume decreased and led to a reduction in the cooling capacity response. This phenomenon occurs after a long period of time on the compressor, its wear and tear, the parts with a large gap, the valve sealing performance decline caused by the actual exhaust volume drop.
[Remedy] check whether the cylinder head paper gasket is punctured and caused by leakage; check whether the high and low pressure exhaust valve piece is not closed; check the piston and cylinder clearance!
5.Vaporizer surface frost is too thick
[Failure Analysis] long-term use of the cold storage evaporator to regular frost, such as frost, the evaporator tube on the frost layer thicker and thicker, when the entire pipeline wrapped into a transparent layer of ice, will seriously affect the heat transfer, resulting in the temperature inside the library fell below the required range.
[Excluding methods] stop frost, open the door to allow air circulation, but also available fans to accelerate the circulation, reduce the frost time.
6, evaporator piping in the refrigeration oil
Failure Analysis] In the refrigeration cycle, some of the refrigerant oil residue in the evaporator piping, after a long time of use, the evaporator residual oil is more, it will seriously affect the heat transfer effect, the phenomenon of poor refrigeration.
Remove the refrigerant oil in the evaporator. Remove the evaporator, blow washing and then drying. Not easy to disassemble, can be from the evaporator inlet with a compressor to pump, and then dry with a blowtorch, this article source refrigeration encyclopedia weibo public number.
7, the refrigeration system is not smooth
[Failure Analysis] due to the refrigeration system cleaning is not clean, after a number of hours of use, dirt gradually silt in the filter, part of the mesh is blocked, resulting in a reduction in refrigerant flow, affecting the refrigeration effect. Expansion valve in the system, the compressor suction port of the filter mesh also has the phenomenon of microblockage.
[Excluding methods] can be micro-clogging parts removed cleaning, drying and then mounted.
8, filter clogging
[Failure Analysis] The desiccant is used for a long time into a paste to seal the filter, or dirt gradually accumulated in the filter caused by clogging.
[Remedy] Remove the filter cleaning, drying, replacement of the new desiccant, loaded into the system.
9, expansion valve temperature-sensitive package refrigerant leakage
[Failure Analysis] expansion valve temperature sensing package temperature sensing agent leakage, the diaphragm below the two forces to promote the diaphragm to move upward, the valve hole is closed, the system refrigerant can not pass through the refrigeration does not cool, this time the expansion valve does not frost, low-pressure vacuum, the evaporator can not be heard in the airflow sound , this article from refrigeration encyclopedia WeChat public number.
[Exclusion method] shutdown shut-off valve, remove the expansion valve to see if the filter is clogged, if not, the mouth can be used to blow the expansion valve inlet, to see if the ventilation. Can also be visually inspected or disassembled and replaced when damaged.
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10, cold air-cooled condenser cold storage heat dissipation effect is poor
Failure analysis
① fan is not open.
② The fan motor is damaged.
③ The fan is reversed.
① The fan is damaged. ② The fan is reversed. ④ The ambient temperature is high (more than 40℃).
⑤ The condenser heat sink is blocked by oil and dust, and the air does not circulate.
Remove the dust on the surface with a wire brush or clean it.
11, water-cooled condenser cold storage heat dissipation effect is poor
Failure analysis
① cooling water valve is not open or open too small, the water pressure is too low
② water regulator valve failure.
③ condenser tube wall scale thick.
Check the cooling water volume. Remove the scale.
12, the system is charged with too much refrigerant
Failure analysis] too much refrigerant leads to a significant increase in exhaust pressure, exceeding the normal value.
[Removal methods] stop, in the high-pressure exhaust hole will be excess refrigerant excluded from the system.
13, the system has residual air
[Failure Analysis] There is air circulation in the system, there will be exhaust pressure is too high, high exhaust temperature, exhaust pipe hot, poor refrigeration, compressor operation soon, the exhaust pressure exceeds the normal value.
[Removal methods] stop the machine, in the exhaust valve hole to release air.
14, suction pressure is too low caused by the shutdown
[Failure Analysis] When the suction pressure in the system is lower than the set value of the pressure relay, its contact action and cut off the power supply.
[Troubleshooting] 1, refrigerant leakage. 2, the system has a blockage.
15, the temperature controller out of control
[Failure Analysis] thermostat adjustment failure or improper installation of temperature sensing package.
[Remedy] Remove the thermostat to overhaul its contacts, adjust, adjust the temperature sensing package location, replace the thermostat.
16, other causes of sudden stop
[Failure Analysis] in the use and maintenance process, often need to open and close the exhaust, suction, reservoir and other cut-off valves, sometimes due to negligence and not open the cut-off valve, resulting in a sudden rise in exhaust pressure.
Troubleshooting] Stop the machine immediately to prevent danger.
Xinxiang Yukun Refrigeration Technology Co. is a production and sales of refrigeration two apparatus parts and sheet metal products, mainly engaged in condenser, evaporator, heat exchanger, reservoir, filter drier, Fin Evaporator (condenser), Stamping Parts, sheet metal parts, aluminum tubes for refrigeration, etc.

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Our company mainly produces products for:Fin Evaporator.Fin Type Condenser.Capillary Tube.Aluminum Coolant Reservoir.Plate Reinforcement Parts.Stamped Parts.Aluminum Tube.Instrument Testing Equipment.
Supermarket Refrigeration Show Case Copper Condenser Coil
1. OEM or ODM can be accepted
2. Fin type: Louver or corrugated
3. Be customerized according to samples and drawings.
4. High quility and low price and energy saving 60% (CE, RoHS, EMC and ISO9001 certification) The CD series products can be used in Various specificantion Condensing Units .