Refrigerator other system components

Refrigerator Troubleshooting – Oil pressure failure switch

This is generally used with compressors incorporating oil pumps and on multiple compressor systems. The function of the control is to stop the compressor(s) when the oil pressure developed by the pump falls below a specific level, or if the oil pressure fails to reach a maximum safe level within a desired period after starting.
The [...]

12Nov2009 | admin | 1 comment | Continued

Refrigerator Troubleshooting – Filter drier

This is installed in the liquid line of the system after the receiver. Construction is generally in the form of a tube which contains coarse and fine mesh filters. These prevent foreign matter such as dirt, metal filings and carbon sludge circulating with the refrigerant. The tube also contains a drying agent or dessicant which [...]

12Nov2009 | admin | 0 comments | Continued

Refrigerator Troubleshooting – Check valve

This is sometimes called a non-return valve. It is a simple device used to ensure that fluid or vapour can only travel in one direction and not back up to another part of the system pipework. Check valves have been mentioned in connection with oil separators (Figure 75), multiple evaporators (Figure 84) and hot gas [...]

12Nov2009 | admin | 0 comments | Continued

Refrigerator Troubleshooting – Crankcase heater

This is a resistance heater. If externally mounted it is located on the underside of the compressor crankcase. It may be mounted internally as an integral part of the compressor; this is standard for larger commercial equipment.
The presence of liquid refrigerant in a compressor crankcase is wholly undesirable. It could cause dilution of the lubricating [...]

12Nov2009 | admin | 0 comments | Continued

Refrigerator Troubleshooting – Solenoid valve

This is an electrically operated magnetic valve. It consists of a coil wound around a sleeve of non-magnetic substance. When energized, the coil carries an electrical current and becomes a magnet.
Inside the sleeve is a movable iron core, which will be attracted by the magnetic field of force to remain suspended in a midway position [...]

12Nov2009 | admin | 0 comments | Continued