Search Trouble
Test methods to find sources of trouble arc, based on the principles of operation of the mechanism. Checking of pressure, temperature, running time, and current or voltage helps to identify the defective part. The technician should have profound knowledge in the field of refrigeration fundamentals and cycles. Only then can he become a reliable and competent in trouble tracking and repair. Trouble in the refrigerator mechanism should be located before dismantling. This keeps the cost of maintaining a minimum and ensures the correct operation of the unit after repair and Assembly.
Methods of search and trouble vary depending on the system type. Search trouble different if you use a direct expansion systems with those using a capillary tube. Service call shoidd specify what the problem is. The owner probably say that it costs too much to work or that the unit is not freezing but works continuously; or, the complaint may be that he was freezing, but runs continuously. These complaints will usually give you an idea of what the problem is.
Always make sure that these allegations check over the refrigerator before performing any Troubleshooting or servicing.
In trouble tracing, first, to classify the type of the service call. Then determine what problems described in the service. The following recommendations pointers are designed to help you. Naturally, it is impossible to give every detail. However, once the technician discovers a method for tracing trouble, there should be no difficulties.
Check all of the following in refrigerating machines before solve the problem:
- The low-pressure side.
- High pressure.
- The temperature of the evaporator.
- Temperature of liquid and suction lines.
- The number and dryness of the refrigerant.
- Time of work for the mechanism.
- The possibility of leakage.
- The noise.
Several basic principles, do a search trouble easier. With weak or no cooling, either or both of two things may be wrong:
- Little or no refrigerant.
- The pump is not moving refrigerant. The pressure is not correct.
If there is no refrigerant is not liquid refrigerant in the evaporator. The refrigerant has leaked out or takes place in a specific part of the system. This can be carried out due to clogged needles, clogged screens, and pinched lines. Clogging of the reasons for the high vacuum reading on the low side.
Lack of refrigerant throughout the system, causing a hissing sound on refrigerant management. Tin specifies the refrigerant moves are not closed. Sight glass will show bubbles. The hissing sound of the refrigerant management always points to the lack of refrigerant. Dry gas going through the limitation causes gas noise.
if the pump is not running, the low side pressure will be higher than usual. Capacitor and discharge line from the compressor will be below normal temperature. To determine the cause of a bad condensation condition, set manifold. Then determine the pressure. Compare this pressure so that there should be pressure refrigerant is used...
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Industrial