The Hidden Mystery Behind AIR CONDITIONER

One of the most frustrating problems with a window air conditioner is if it starts to ice up. For who owns the air conditioner is can be perplexing.

When this problem occurs a lot of people immediately believe that it is the fault of the refrigerant gas. More regularly the cause is the consequence of other difficulties.

It is most often the result of poor airflow.

Any time the airflow through an air conditioner is fixed the cooling system becomes affected. If taken to extremes the critical pressure-temperature balance of the cooling coil can be changed. If they drop too low the cooling coils surface temperature can drop below the dew point temperature of the area. At these times the cooling coil will quickly operate as a refrigerator rather than an air conditioner. Instead of simply cooling the air it’ll collect and hold moisture. The moisture will freeze onto the cooling coil where it’ll appear as ice.

The primary job of an air conditioner would be to de-humidify, not refrigerate, the area air. By detatching the moisture from the room air it gives us a feeling of comfort. To do this though the temperature of the cooling coil should always be greater than the room’s dew point. If it’s permitted to drop below the dew point the air conditioner will start to produce ice.

With this information in mind the following are a few problems that can lead to your air conditioner icing up:

1. Dirty filter.
To avoid this replace or clean your filter every little while of the cooling season. In case a smoker do it every week. To clean filter remove from air conditioning equipment, wet thoroughly, and lay in bottom of a sink. Sprinkle detergent (laundry detergent works well) onto filter surface. Allow to sit for a few minutes. Add tepid to warm water to sink so that filter is totally covered. Soak for quarter-hour. Remove from water and rinse. Allow to air dry.

2. Dirty or blocked cooling coil.
An air conditioning equipment requires regular maintenance. Usually every two or three years. 空氣清新機 would be best, but this could be costly unless you do it yourself. During cleaning the cooling coil should be degreased and washed to eliminate accumulated dirt and debris. Degreasing is important to remove any coatings on the coil. If not done greasy residue can trap and hold air borne particles. They will build-up on the coil and affect heat transfer. If left too much time this can result in the cooling coil becoming partially blocked. This can produce a lower airflow.

3. Dirty or blocked condenser coil.
The condenser coil may be the one at the rear of the air conditioning equipment. Its job is to dissipate the heat that’s being removed from the area. Similar to the cooling coil it too should be cleaned every few years. Because the condenser is on the outside of the home it becomes exposed to a great deal of dirt, pollen, and smog. Since airflow direction is from inside to outside it is the inside surface of the condenser that becomes dirty. Therefore to completely clean this part the air conditioning equipment must be completely disassembled. If not cleaned regularly an airflow blockage here can even burn out the compressor. Before this happens although lowering of airflow will affect the entire operation. This can result in the compressor efficiency dropping, the inner pressure-temperature relationships being affected, and the resultant production of ice on the cooling coil.

4. Inefficient compressor.
As describe above an inefficient compressor could cause icing up. If the compressor is not able to pump the refrigerant properly the cooing coil might not get cold enough to shut down the cold control. It can hover just above the cut off point. When this happens the cooling coil will quickly refrigerate. Ice on the cooling coil will result. If the compressor itself is at fault the air conditioner should be replaced. But remember that many icing problems are misdiagnosed as bad compressors if they were actually one of the other faults discussed in this post.

5. Not enough refrigerant. Too much refrigerant.
Both scenarios can result in and icing condition. If your air conditioning equipment was repaired recently suspect an excessive amount of refrigerant. Blended with an airflow problem this is often difficult to diagnose. Or even repaired recently then suspect airflow problems before considering a refrigerant imbalance.

6. Outdoor temperature too low.
Icing can occur if the outside temperature falls below 60 Degrees Fahrenheit. If the outside temperature is too low the air conditioning equipment pressure-temperatures can be affected. Once the outside temperature falls the cooling coil temperature will also fall. So much that the coil will refrigerate the area air. This will result in the cooling coil starting to produce ice. This problem is more prevalent in the fall. If it is hot during the day but cold at night suspect this problem because the reason behind icing up. If this problem is suspected try running the air conditioner in the fan only position. Leave the re-circulating vent open. This will circulate the room air without cooling it, while attracting handful of outside air at night time.

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