14.2. Service of central air of air
The discharge of central air of air or replacement of a coolant of R-134 a should be carried out by the qualified personnel having the license and using only the approved equipment.
Internal elements of system of cooling are in a condition of chemical stability until the coolant and oil for greasing are used pure, without moisture. The insignificant amount of dirt, moisture and damp oil can break chemical stability of system and working capacity or to put out of action air central air.
The liquid coolant of R-134 a very easily evaporates with intensive absorption of heat. Its hit on skin can end with frostbite therefore at work with a coolant it is necessary to put on protective gloves.
As standard measures of protection at work with a coolant it is necessary to use points for protection of eyes. At coolant hit on clothes or protective equipment immediately wash out the struck place a large amount of water.
The liquid coolant of R-134 an is necessary for storing in the tight container at temperature no more 52°C (126°F).
For check of tightness of central air the leak index is used. Keep in mind that R-134 a, after contact to a flame of the index of leak forms poisonous gas phosgene.
For greasing of system and knots use only the recommended lubricant for R-134 a. If to use other lubricants except recommended, system damage is possible.
PAG greasing intensively absorbs moisture from atmospheric air therefore it is necessary to observe the following precautions:
at separation of components of central air of air immediately close connections by the corresponding covers for an exception of hit of moisture in system;
at installation of new components of central air of air remove from them protective covers directly ahead of their installation;
connect tubes and hoses of central air of air as soon as possible to reduce hit in moisture system;
use greasing for air central air only from the tight container.
If there was a casual discharge of central air of air, before service of system air a workplace.
Arrangement of elements of central air of air on the car