Expansion valve capacity too small 1. No subcooling of the refrigerant liquid. 2. The pressure drop across the expansion valve is less than that for…
Author: sam
Visual fault finding Compressor not running 1. Main supply isolator open. 2. Fuse blown. 3. Overload open circuit. 4. Control circuit open (low pressure switch,…
The modern domestic absorption refrigerator or ‘gas refrigerator’ operates on the principle of using heat to produce cold. It employs a mixture of hydrogen and…
Domestic refrigerators and freezers operate with very small refrigerant charges, and the charge must be administered accurately. This can be best achieved by using a…
The diagnosis of electrical faults on components and compressors has already been dealt with in previous articles. The following procedure may be carried out to…
Capillary restrictor Domestic refrigerators and freezers do not employ a mechanical device as a refrigerant flow control. Instead a capillary restrictor meters refrigerant liquid to…
There are numerous refrigerator and freezer system arrangements. Figures 52-55 show the basic refrigeration circuits for a conventional refrigerator, a two-door refrigerator/freezer, an upright freezer…
Supply and control switch 1. Check the electrical supply at the power point, the fuse and the fuse rating. 2. Ensure that the control switch…
The most common cause of motor failure is overheating. This condition is created when a motor exceeds its normal operating current flow. The result can…
This form of starting device is used on open drive motors. It comprises three major components: the switch contacts, the moving contact arm and the…