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Commercial refrigeration refrigeration failure and maintenance method
author: supermarket refrigerated showcase category: commercial refrigeration Views: 567Time: 2016-08-22
refrigeration failure and maintenance method
if there is no special instruction, the refrigeration maintenance is poor Often accompanied by non-stop or long start-up time and short downtime. No boot description in each fault. Before repairing a commercial refrigeration refrigeration system, it is necessary to distinguish whether it is a direct cooling type, an indirect cooling type or a dual temperature dual control type: and then distinguish whether it is a failure machine or a second failure machine.
if the machine fails, first observe whether the exposed pipeline (focus on the weld) has oil stains, blackening or dust damp, be careful; secondly, observe whether the door frame has any Rust. In this way, the key inspection parts can be determined. If there is oil stains, or welding joints black, dust and oil stains, which are mainly caused by refrigerant leakage, the inspection should be focused on whether there is leakage; if the middle door frame is corroded, focus on whether the anti-dew tube is checked Leakage: There is neither oil nor rust, indicating that the
commercial refrigeration may have internal leakage (low pressure leakage) or poor compressor performance.
the secondary failure machine, but also to observe whether the return pipe is frosted, whether the noise increases during the compressor startup, and whether the condenser heat changes uniformly. If the return air is frosted, it is because the refrigerant is overfilled. If the compressor starts, the noise becomes louder at a normal moment. It is caused by the welding blockage of the refrigeration pipeline; if the compressor is running, there are snoring noise or local condenser overheating , The local normal temperature is caused by unclean evacuation. For indirect cooling machines, observe the frosting of the evaporator and the operation of the fan. If the evaporator is thickly frosted, check the defrosting circuit; if the fan is not running, check the fan motor and switch. For dual-temperature dual-controllers, if the refrigerating room is poor, check the refrigerating thermostat first, and then check the refrigeration system.
[Note] ①If fluorine-free
commercial refrigeration is used for maintenance, the filter drier must be replaced after the refrigeration system is repaired, and the original filter drier cannot be used after activation treatment.
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② For models using R134a refrigerant, the compressor opening time cannot exceed 50 minutes.
③ R600a refrigerant compressor cannot be turned onFor shell repair, it is necessary to replace the compressor of the same type with the yellow flame-proof mark.
poor cooling and downtime for several hours. Trouble phenomenon: poor cooling, can automatically start and stop, every 30 minutes or so, automatically stop for several hours. When the compressor is running, the condenser has 2/ 3 heat, and the heat changes uniformly. Failure analysis: The refrigeration system is normal, and the thermostat performance is deteriorated. For models with a
commercial refrigeration ambient temperature of 15°C, the temperature of the refrigerating room will rise slowly and the thermostat will have difficulty starting. Troubleshooting: Check and repair according to the ambient temperature of commercial refrigeration. For models with an ambient temperature higher than 16℃, directly replace the thermostat of the same model and pay attention to the number of turns of the temperature sensing tube coil to be roughly the same as the original one. For models with ambient temperature lower than 15℃, first turn on the low temperature compensation switch to test the machine. If there is no change, first replace the thermostat of the same model, and then check the low temperature compensation heating circuit, the components in the dotted frame. Measure the resistance at both ends of the heater and the compensation switch in turn. If the resistance value is infinite, it means that the device under test is damaged.
poor cooling and abnormal appearance. The abnormal appearance is mostly the point of failure. For example, if there is oil stains in the refrigeration pipeline on the back of the commercial refrigeration body or at the welded joints, 95% of the oil stains are leaking; the side of the freezer compartment of the middle door frame is rusted, and 90% is the leakage of the anti-dew pipe in the door frame; the evaporator pipe is corroded , 50% corrosive leak: abnormal noise when the compressor is running, mostly due to insufficient compressor exhaust. Basic maintenance sequence: open the compressor process nozzle to vent and observe the refrigerant discharge, after suppressing the system, use soapy water to check for leaks, and test the compressor exhaust pipe to determine the fault.
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