Central air of air represents potential danger. At its service observance of certain rules is required. Central air should be served by the technicians trained in safe working methods, with use of the appropriate equipment and observance of rules of depressurization, collecting and storage of automobile coolants.

Central air of air is under pressure therefore do not open a contour of cooling of central air while the coolant is not pumped out.

Do not allow contact of a coolant to skin.

At work near central air put on goggles.

At coolant hit on skin or in eyes do not pound the struck place, immediately wash out cold water not less than 15 mines and address to the doctor. Self-treatment is not allowed.

The coolant is stored in a new cylinder under pressure.

Store a cylinder at temperature not above 50 °C. Take the measures excluding falling of a cylinder from height or other situations which can lead to its damage.

Works should be carried out in well aired room. The coolant quickly evaporates, interferes with access of oxygen and complicates breath.

The gaseous coolant is heavier some air and rather quickly gathers below, for example, in osmotrovy ditches.

The coolant not горюч, however at contact of a coolant to a flame or the heated subjects is allocated poisonous gas. Store a coolant far from open sources of fire. Do not smoke. When using an ardent techeiskatel avoid smoke inhalation.

At carrying out welding works near air central air always pump out from it a coolant. Electric welding near pipelines with a coolant can cause coolant decomposition under the influence of ultra-violet radiation.

Do not subject central air detail to influence of high temperature or an open flame. The overheat can lead to pressure increase in system and depressurization.

Condenser or evaporator cleaning by means of hot water vapor is not allowed, it is necessary to use only cold water or the compressed air.

Basic distinctions in properties of coolants R-134a and R-12 demand various on a design of central airs of air for each type of a coolant. Mixing of coolants R-134a and R-12 even in insignificant quantities as it will lead to central air failure is not allowed. Mixing of the oils intended for various central airs, also leads to failure of the compressor of the conditioner. It is necessary to use sealing rings which are intended only for an applied coolant as coolant R-134a destroys sealing rings for coolant R-12, and the contour will become depressurized.

Central air refuels coolant R-134a. Details of system are under high working pressure of a coolant: at high temperature of air this pressure can reach the 50th bar. A source of the increased danger at system service by unprepared technicians and when using the equipment which has not been intended for this purpose, is the high pressure and chemical influence of a coolant.

In order that central air of air worked with maximum efficiency, execute the following:

– check a condition of a belt of a drive of the compressor of the conditioner. In the presence of wear and damages replace a belt;

– check a tension of a belt of a drive of the compressor of the conditioner and if necessary, adjust it;

– check a condition of tubes and hoses of central air of air. In the presence of cracks, swellings, stratifications or the unreliable connections leading to leaks, replace them;

– check a condenser condition. If the external surface of the condenser is polluted by leaves and other extraneous inclusions clear the condenser, using a brush and the compressed air;

– be convinced that coolant level in a contour of central air of air corresponds to the demanded;

Fig. 4.31. Arrangement of a drainage tube of a casing of the evaporator of central air of air

– if noise of water or water is audible drips on a floor carpet, check purity of a drainage tube of a casing of the evaporator (fig. 4.31) . In need of a soft wire clear a drainage tube.

To provide no-failure operation of central air of air during the long period of operation, include it at least on 5-10 mines not less often than one-two time a month. It is especially important within winter months as at air temperature below 0°С condensate removal from glasses is accelerated.

One of the most general causes of infringement of operability of central air is low level of a coolant in system.