Domestic refrigerators and freezers troubleshooting
Domestic Refrigerator Troubleshooting – The domestic absorption system
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 ammonia with water (aqua-ammonia) as the cooling agent: water has an affinity for ammonia, and the hydrogen speeds up the process of evaporation.
The heat source may be town gas or, [...]
Domestic Refrigerator Troubleshooting – Refrigerant charging in domestic appliances
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 visual charging cylinder, sometimes called a dial-a-charge (Figure 64).
This is basically a small refrigerant cylinder with a liquid-indicating sight glass or tube. In front of the sight glass and surrounding [...]
Domestic Refrigerator Troubleshooting – Electrical faults
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 quickly pinpoint the faulty component and to eliminate unnecessary dismantling. The electrical circuit is tested for continuity from the terminal board of the circuit. The typical electrical circuit in Figure [...]
11Nov2009 | admin | 0 comments | ContinuedDomestic Refrigerator Troubleshooting – Components and operations
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 the evaporator and maintains a pressure differential whilst the compressor is operating.
Basically the capillary restrictor is a small tube. The refrigerant flow rate is determined by the length of the tubing [...]
Domestic Refrigerator Troubleshooting – Appliance systems
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 and a chest freezer.