 |
 |
|
|
| |
| |
| |
|
|
|
| Car-air-conditioning |
| Website about car air conditioners. Here you can find out everything you want to know about car air conditioners, installation, maintenance, repair. Also you can find many tapes and producers. |
| Language: English |
| RSS Feeds for this Blog |
|
Statistics |
| Unique Visitors: 0 |
| Total Unique Visitors: 262 |
| Visitors Out: 347 |
| Total Visitors Out: 352 |
|
|
|
| |
|
|
| |
|
| A/C System Basics |
| 2007-05-24 14:01:00 |
A/C System OverviewThere are three primary components in a vehicle’s air conditioning system including the compressor, condenser, and evaporator. These parts are connected by tubes and hoses to form a continuous path with two distinct sections: a high-pressure side and a low-pressure side. In order to transfer heat from the vehicle’s interior to the outside air, a chemical refrigerant is circulated throughout the system. In theory, the A/C system accomplishes the same task as the engine’s cooling system, in that both absorb the heat from one area and release it to another (heat transfer). While coolant remains a liquid during the heat transfer process however, refrigerant repeatedly alternates between a liquid and a gas as it circulate...
|
| |
|
| Compressor |
| 2007-05-24 13:56:00 |
Commonly referred to as the heart of the system, the compressor is a belt driven pump that is fastened to the engine. It is responsible for compressing and transferring refrigerant gas. The A/C system is split into two sides, a high pressure side and a low pressure side; defined as discharge and suction. Since the compressor is basically a pump, it must have an intake side and a discharge side. The intake, or suction side, draws in refrigerant gas from the outlet of the evaporator. In some cases it does this via the accumulator. Once the refrigerant is drawn into the suction side, it is compressed and sent to the condenser, where it can then transfer the heat that is absorbed from the inside of the vehicle.......
|
| |
|
| Condenser |
| 2007-05-24 13:54:00 |
This is the area in which heat dissipation occurs. The condenser, in many cases, will have much the same appearance as the radiator in you car as the two have very similar functions. The condenser is designed to radiate heat. Its location is usually in front of the radiator, but in some cases, due to aerodynamic improvements to the body of a vehicle, its location may differ. Condensers must have good air flow anytime the system is in operation. On rear wheel drive vehicles, this is usually accomplished by taking advantage of your existing engine's cooling fan. On front wheel drive vehicles, condenser air flow is supplemented with one or more electric cooling fan(s). As hot compressed gasses are introduced into the top of the condenser, they are cooled off. As the gas cools, it condenses a...
|
| |
|
| Evaporator |
| 2007-05-24 13:53:00 |
Located inside the vehicle, the evaporator serves as the heat absorption component. The evaporator provides several functions. Its primary duty is to remove heat from the inside of your vehicle. A secondary benefit is dehumidification. As warmer air travels through the aluminum fins of the cooler evaporator coil, the moisture contained in the air condenses on its surface. Dust and pollen passing through stick to its wet surfaces and drain off to the outside. On humid days you may have seen this as water dripping from the bottom of your vehicle. Rest assured this is perfectly normal. The ideal temperature of the evaporator is 32° Fahrenheit or 0° Celsius. Refrigerant enters the bottom of the evaporator as a low pressure liquid. The warm air passing through the evaporator fins causes ...
|
| |
|
| Orifice Tube |
| 2007-05-24 13:51:00 |
The orifice tube, probably the most commonly used, can be found in most GM and Ford models. It is located in the inlet tube of the evaporator, or in the liquid line, somewhere between the outlet of the condenser and the inlet of the evaporator. This point can be found in a properly functioning system by locating the area between the outlet of the condenser and the inlet of the evaporator that suddenly makes the change from hot to cold. You should then see small dimples placed in the line that keep the orifice tube from moving. Most of the orifice tubes in use today measure approximately three inches in length and consist of a small brass tube, surrounded by plastic, and covered with a filter screen at each end. It is not uncommon for these tubes to become...
|
| |
|
| Expansion Valve |
| 2007-05-24 13:50:00 |
Another common refrigerant regulator is the thermal expansion valve, or TXV. Commonly used on import and aftermarket systems. This type of valve can sense both temperature and pressure, and is very efficient at regulating refrigerant flow to the evaporator. Several variations of this valve are commonly found. Another example of a thermal expansion valve is Chrysler's "H block" type. This type of valve is usually located at the firewall, between the evaporator inlet and outlet tubes and the liquid and suction lines. These types of valves, although efficient, have some disadvantages over orifice tube systems. Like orifice tubes these valves can become clogged with debris, but also have small moving parts that may stick and...
|
| |
|
| Receiver-Drier |
| 2007-05-24 13:48:00 |
The receiver-drier is used on the high side of systems that use a thermal expansion valve. This type of metering valve requires liquid refrigerant. To ensure that the valve gets liquid refrigerant, a receiver is used. The primary function of the receiver-drier is to separate gas and liquid. The secondary purpose is to remove moisture and filter out dirt. The receiver-drier usually has a sight glass in the top. This sight glass is often used to charge the system. Under normal operating conditions, vapor bubbles should not be visible in the sight glass. The use of the sight glass to charge the system is not recommended in R-134a systems as cloudiness and oil that has separated from the refrigerant can be mistaken for bubbles. This type of mistake can lead ...
|
| |
|
| Accumulator |
| 2007-05-24 13:46:00 |
Accumulators are used on systems that accommodate an orifice tube to meter refrigerants into the evaporator. It is connected directly to the evaporator outlet and stores excess liquid refrigerant. Introduction of liquid refrigerant into a compressor can do serious damage. Compressors are designed to compress gas not liquid. The chief role of the accumulator is to isolate the compressor from any damaging liquid refrigerant. Accumulators, like receiver-driers, also remove debris and moisture from a system. It is a good idea to replace the accumulator each time the system is opened up for major repair and anytime moisture and/or debris is of concern. Moisture is enemy number one for your A/C system. Moisture in a system mixes with refrigerant and forms a corrosive acid. When in doubt, it may ...
|
| |
|
| Retofit Procedure |
| 2007-05-24 13:43:00 |
1. Evacuate the R-12, if there is any left in the system. By law, this must be done without venting (releasing the gas into the atmosphere) by a certified mechanic using approved R-12 Recovery equipment. Many installers will do this without charge, because the R-12 they recover from your system is valuable 2. Attach Adaptor to the low-pressure port:The low-pressure port usually has a blue or black dust cap and is located on the larger diameter tubing that runs between the evaporator (in the dashboard) and the compressor (see FAQ, "How do I find the low-pressure port?"). Remove the dust cap . Attach the adapter to the low-pressure port. 3. Charge the System & Measure Pressure:Assemble the hose and refrigerant can. Be sure the engine is operating and the A/C is set to maximum cooli...
|
| |
|
| Refrigerants |
| 2007-05-24 13:41:00 |
Regardless of the type, all air conditioning systems function according to a basic law of physics that states ‘a fluid absorbs heat as it changes from a liquid to a gas, and a vapor releases heat as it changes from a gas to a liquid.’ In an A/C system, refrigerant is the transfer medium used to absorb the heat inside the passenger compartment and release it to the outside air. Refrigerant is a tasteless, odorless gas with an ability to change state rapidly within a specific temperature range. It is also oil soluble and non-corrosive. While there are scores of refrigerants on the market, there are only two types approved by vehicle manufacturers: R-12 and R-134a. R-12, commonly referred to as Freon, has long been used as the refrigerant in all automotive A/C systems. However, R...
|
| |
|
| A/C Recharging Method |
| 2007-05-24 13:39:00 |
Push-Button Dispensing With Measure & Charge (MAC-134) and EZ Charge (SD-134), dispensing refrigerant is as simple as pressing a button. You just connect the hose to the low-pressure port, press the button on the can to fill (to "charge") and release to stop. With Measure & Charge, releasing the button will automatically give you a pressure measurement on the in-line gauge (which is re-usable). Both let you store unused refrigerant for later. Both contain the appropriate proportions of refrigerant and oil, as well as System-Safe leak sealer. See full instructions on this site or on the can. Trigger Dispensing With the Quick Charge charging gun (QC-1CS and QCK-2CS), you simply connect the hose to the low-pressure port, screw a can of refrigerant into the Quick Charge, squeeze the trig...
|
| |
|
| |
 |
|
| |
| |
|
 |
