Tip & How-To about Refrigerators

How a refrigeration system works Basic example

Reference to refrigeration. There are 4 main components in a refrigeration system 1. The compressor. 2. The condenser. 3. The expansion device. 4. The evaporator. all refrigeration systems work the same even air conditioning. How you control them is the problem. What you must always know is that Heat always goes to Cold never the other way round.
Hot gas comes from the compressor and is sub cooled by the condenser, it then becomes a liquid before it reaches the expansion device. It is then squeezed through the expansion device into a larger space where it evaporates attracting all the heat it can from the space needing to be chilled, it then transfers this heat from the said space back to the compressor where it is then compressed again taking the heat from the space and the compressor to the condenser where it gives up it's heat to the atmosphere. It then goes back into cycle and repeats over and over again. That is why it is vital that there is airflow throughout the system. once there is a blockage and no airflow it is just like you and me, we get hot and do not feel like working, we slow down and eventually stop. That is how a refrigeration system works, how you control it is another matter. More later.

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wht is a TXV


Simply it's a valve in a refrigeration system that controls or meters how much coolant is allowed into the evaporator.
A thermal expansion valve (often abbreviated as TEV, TXV, or TX valve) is a component in refrigeration and air conditioning systems that controls the amount of refrigerant flow into the evaporator thereby controlling the superheating at the outlet of the evaporator. Thermal expansion valves are often referred to generically as "metering devices".
A thermal expansion valve is a key element to a heat pump; the cycle that makes air conditioning, or air cooling, possible. A basic refrigeration cycle consists of four major elements, a compressor, a condenser, a metering device and an evaporator. As a refrigerant passes through a circuit containing these four elements, air conditioning occurs. The cycle starts when refrigerant enters the compressor in a low pressure, low temperature, gaseous form. The refrigerant is compressed by the compressor to a high pressure-and-temperature gaseous state. The high pressure-and-temperature gas then enters the condenser. The condenser precipitates the high pressure-and-temperature gas to a high pressure liquid by transferring heat to a lower temperature medium, usually ambient air. The high pressure liquid then enters the expansion valve where the TX valve allows a portion of the refrigerant to enter the evaporator. In order for the higher temperature fluid to cool, the flow must be limited into the evaporator to keep the pressure low and allow expansion back into the gas phase. The TXV has sensing bulbs connected to the suction line of the refrigerant piping. The sensing bulbs give temperature readings to the TXV to adjust flow of refrigerant.[2]
http://en.wikipedia.org/wiki/Thermal_expansion_valve

Jun 18, 2014 | 2006 Saturn Vue

1 Answer

what causes popoff valve to popoff on 2005 Kia Sorento while adding freon


High pressure restriction look at the following components #1 overcharged system #2 condenser fans not operating when compressors on. #2 plugged or stuck closed expansion valve (oriface Tube) #3 restricted condenser.

Apr 07, 2014 | 2005 Kia Sorento

2 Answers

where is the orifice tube on a 98 Buick LeSabre located?


not exactly sure but using info below you can find it.

Remember the flow for the a/c system is :
1. From the compressor a high pressure (HP) gas goes to the condenser in front of the radiator.
2. From the condenser a HP liquid goes to an expansion device (orifice tube or expansion valve)
3. From expansion device the low pressure gas enters the firewall to the evaporator.
4. From evaporator the low pressure liquid/gas mixture goes through the dryer2_bing.gif back to the compressor suction.

There will be about a 1" nut on the low pressure line between the firewall and the compressor. Remove nut and on the male side use a pair of kneedle nose pliers and remove orifice tube. Note orientation of tube.

Replace tube, reassemble, evacuate air from system, recharge with freon.

May 29, 2010 | 1998 Buick LeSabre

1 Answer

a/c low pressure quick disconnect location? 1999 ford expedition


on the tube between the firewall and the a/c compressor. On some Fords the low pressure port is on the dryer2_bing.gif (aluminium cylinder). Good news is the low pressure and high pressure port are different sizes. You cannot mess it up.

Remember the flow for the a/c system is :
1. From the compressor a high pressure (HP) gas goes to the condenser in front of the radiator.
2. From the condenser a HP2_bing.gif liquid goes to an expansion device (orifice tube or expansion valve)
3. From expansion device the low pressure gas enters the firewall to the evaporator.
4. From evaporator the low pressure liquid/gas mixture goes through the dryer back to the compressor suction

May 29, 2010 | 1999 Ford Expedition

1 Answer

My freezer is not freezing and now the fridge is not cooling. Is is worth fixing?


Good day,
If the compressor has failed, then replacement of the machine might make sense, but a refrigerator is a complex device with many components, that can be replaced at nominal cost.
1. The defrost system failed. Usually shows up as frost building up on the rear panel of the freezer compartment. Consists of 3 parts.
2. Circulating fan motor in freezer compartment failed.
3. Condenser cooling fan motor located in the bottom rear of the machine behind the rear cover near the compressor.
4. Compressor not running because the start components failed.
These are mounted to the side of the compressor and consist of
the overload, start relay, and on some models a start/run capacitor.
5. Defective thermostat, not running the machine or not running it enough.
Once these basic items are checked, your question can be answered.

Nov 28, 2009 | KitchenAid KSRG25FKSS Side by Side...

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