Repair of refrigerators

Repair of refrigerators

Refrigerators don’t really make things cold so much as they take away heat. Inside a refrigerator, it is working to carry the heat energy and pump it outside the appliance. The end result is the same, the temperature inside the freezer drops.

Refrigerators don’t really make things cold so much as they take away heat. Inside a refrigerator, it is working to carry the heat energy and pump it outside the appliance. The end result is the same, the temperature inside the freezer drops.

A refrigerator uses a compressor, ammonia or another refrigerant, a long system of tubing, an expansion valve and a couple fans to chill the food stored inside. The refrigeration system is a closed loop and it cycles over and over again to pump out the heat (or to cool off the fridge, if you prefer to think of it that way).
The compressor does as the name implies, it compresses the refrigerant. Compressing a gas causes its temperature to rise, so it is circulated through tubing outside the appliance to allow it to dissipate heat into the room. As the compressed gas cools and reaches the location where it enters the interior of the refrigerator, it passes through an expansion valve and the pressure drops. When the gas goes from a high pressure state to a low pressure state its temperature drops.
A fan circulates the air in the freezer over the now very cold refrigeration tubing. The refrigerant absorbs the heat from the freezer and carries it back outside the appliance to return to the compressor again. A thermostat in the refrigerator monitors the temperature and signals the compressor when to start a refrigeration cycle. Some models have a second thermostat in the freezer for more precise temperature control.
In most refrigerators, the refrigerant passes through the freezer and then the air is circulated between the freezer and the refrigerator to lower the refrigerator’s temperature. However, in some models, the refrigerant tubing also passes through the fridge.
A side effect of the drop in air temperature is condensation. The water in the air condenses and forms on the contents and interior of the fridge andfreezer. In the freezer it freezes into ice, resulting in frost build-up. Most freezers have an automatic defrost system to control the build-up of ice. The system simply turns cuts the circuit to the compressor and turns on a heater to melt the ice. The cycle runs for a period of time, the ice run-off is channeled to a evaporation tray on the outside of the appliance and when the cycle completes, the circuit to the compressor is restored.
When the refrigerator or freezer door is opened, a door switch turns on the interior light. In some cases the switch also disables some circuits, such as the interior fan or the through-the-door ice and water service.

Refrigerator Tips and Advice
Do:
• The proper temperature range is about 36 degrees Fahrenheit for the fridge between 0 and 5 degrees for the freezer.
• Buying a new refrigerator may dramatically reduce your energy bill.
• Clean the coils with a vacuum or duster every six months to improve efficiency and reduce operating costs.
• During a power outage a fridge will stay cold for about 8 hours and a freezer will stay cold for about 48 hours. Don’t open the door unless absolutely necessary.
• Regularly defrost your manual defrost freezer and never chip away the frost.
• A full fridge is more efficient than a half empty one, but don’t overfill it either.
• Do remove the door of a refrigerator or freezer in storage or prop the door open so that a child cannot close the door.
• Do keep your refrigerator upright during moving and storage.
• Do wait 24 hours after moving a refrigerator before plugging it in.
• Keep at least two inches or air space behind your refrigerator and six inches above it.
Don’t:
• Don’t overfill your refrigerator or it won’t cool as well.
• Don’t chip away the frost in manual defrost freezers.
• Don’t store your refrigerator unplugged for extended periods of time. Some units require continuous use to ensure proper lubrication of the compressor. If possible, plug in the refrigerator once every few months and let it run for a couple hours.
• Don’t tip the refrigerator onto it’s side because oil from the compressor can run up into the filter/dryer and get trapped.

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