Mazda 626

1991-1998 of release

Repair and car operation

Being once a prerogative of only smart cars, the conditioner nowadays becomes an integral part of the increasing and bigger number of "ordinary" family cars. By estimates of experts, by the beginning of the following eyelid a half of all European cars will be on sale with the conditioner as by a standard accessory.

Central air, simply speaking, selects at air heat, and also reduces level of its humidity. Therefore, air in car salon always more cool and not such damp that creates feeling of freshness.

How the microclimate in salon is created?

Standard central air consists of several working knots connected among themselves by tight system of tubes. It is filled with a coolant which passes from a liquid form in gaseous and back, transferring heat from salon.

The most important detail on which overall performance of the conditioner depends, the regulating gate which is established on the evaporator placed in salon of the car is. The coolant in the form of liquid under a high pressure arrives via regulating gate in the evaporator where it is sprayed in the form of a gazo-drop mix (fog). The regulating gate can be needle or such as a diaphragm. We will consider the first option.

In the needle gate there is a small opening, and the needle located in an opening is capable more or to block less it, changing thus effective section. The needle is put in action from a temperature-sensitive element placed in the evaporator.

Liquid coolant, passing through a small opening in the gate, evaporates and turns into gas under low pressure. This process is accompanied by sharp temperature drop. The opening less, the becomes colder халадагент, that is the temperature in the evaporator can be regulated, entering or deducing a needle from an opening. The temperature of a surface of the evaporator should be close to a water freezing point, but not below it, differently on the evaporator ice that will complicate movement of air and heat transfer to a coolant will be formed.

As it was already told, instead of the needle gate sometimes, the diaphragm is established. In it there are no moving parts therefore the coolant expense in the evaporator is not regulated, but its giving is supervised by means of the thermorelay or the pressure relay. Having turned into gas of low pressure, the coolant passes on the evaporator (heat exchanger) and selects heat at air in salon. For bigger efficiency of this process the heat exchanger is supplied with edges. Moisture containing in air is condensed on an external surface of the heat exchanger and merges out of salon. Air, having passed through the heat exchanger, comes back to salon colder and dry.

Saved up by a coolant it is warmly necessary to give to the atmosphere, for what the coolant by means of the compressor goes to the condenser (is one more heat exchanger located usually in a forward part of the car).

The compressor, which task – to banish a coolant on system tubes, transferring heat from low temperature level on higher, works by a principle of the pump and is brought by a belt from the engine via the electromagnetic coupling that the conditioner could be disconnected. When the compressor works, he creates depression which "exhausts" a gaseous coolant from the evaporator.

In the compressor pressure of a coolant raises, and it arrives in the condenser, but already in the form of gas under a high pressure. In the condenser gas turns again into the liquid, heat thus containing in it dissipates from a condenser surface in the atmosphere.

From the condenser the coolant – already in the form of liquid under pressure – again moves on regulating gate, and the cycle repeats.

Additional "lotions"

In practice the described base scheme includes still some knots, in particular, a receiver dehumidifier which often (but not always) is mounted between the condenser and the regulating gate. This device (it sometimes call "accumulator") filters a coolant and deletes from it moisture. Sometimes the dehumidifier is supplied with the color indicator which shows when it it it is time to replace its (it means that it gathered a moist