How to fill the conditioner with the refrigerant

Air and moisture exhaust
Refrigerant filling
Checking of the refrigerant amount
Distinctive features at checking of the systems of air-conditioning, filled with the refrigerant R-134a

Attention: Systems of air-conditioning using refrigerant R-134a and oil from lines POLYALKALINE GLYCOL (PAG) can not be replaced with refrigerant R-12 and oil of a mineral origin. At non-observance of this requirement there will be a failure of the system of air-conditioning, accompanying with breakage of components.

Safety measures at maintenance service of the air -conditioner with refrigerant R-134a

At regeneration and filling of refrigerant R-134a in the system of air-conditioning it is necessary to use the ordered equipment.
At escape of vapor, mixed with the refrigerant, eyes, nose and throat are irritated. Therefore, it is necessary to be careful, that vapours with the refrigerant have not got into an organism.
If there is an outflow in the system prior to the beginning of work, it is necessary to air a workplace.
It is impossible to check a high pressure of air pressure and presence of outflow in the equipment for filling the refrigerant R-l34a or in the system of air-conditioning of the automobile.
At check of pressure of the equipment for filling the refrigerant R-l34a and systems of conditioning of the automobile to not apply air of a high pressure as at mixing refrigerant R-134a and air, pressure is increased and the inflammable substance which may blow up is formed.
For safety of works and protection of a body against the refrigerant and substances of lubricant system it is necessary to pay attention to below-mentioned requirements of precautions:

At replacement of details of the conditioner always disconnect (-) the plug of the storage battery.
Pay attention, that in system the moisture and a dust have not got.
Before connection of a hose to any pipeline it is necessary to lubricate the sealing ring of a connecting part with the oil of the refrigerant.
At plum of the refrigerant, use the equipment of return / regeneration/filling for R-134а and not let release of the refrigerant into the atmosphere.
In case of replacement of elements of the system of air-conditioning, set up each element after refuelling by regulated amount of oil (it is necessary to measure amount of the refrigerant oil allocated from system of conditioning).

For prevention of pollution once drained oil do not fill in again into a vessel and it is necessary to apply measures not to mix with another refrigerant oil.
After use of oil, it is immediately necessary to replace a cap and condensation so that to close access to a moisture.
It is necessary to pay attention to that refrigerant oil has not got on the case of the automobile as it may damage painting. And at oil getting to the casing, it should be immediately removed.

Checking

Conditions of checking.

Avoid direct sunrays;
Set up the handle of a temperature regulator on the maximal cooling (button MODE CONTROL on VENT, button CONTROL of internal and external air in position of switching-off of external air);
Set up the fan regulator for the maximal speed;
Set up speed of rotation of the engine on 1500 rev/min;
Presence of somebody at interior of the automobile is excluded.

After work of the conditioner within 10 minutes under such circumstances of checking, they take target temperature on the thermometer and pressure of system of high and low pressure on a manometer of the conditioner.

Table of checking pressure of the air-conditioning systems filled with refrigerant R-134a

Checking results	Type of defect	Reason of defect	Way of elimination
Too high filling pressure (on the part of high pressure)	After the compressor stop, pressure first sharply decreases, then falls slowly.	The system is filled with air.	Works on drain, exhaust, and filling up to the regulated values.
	When cooling condenser with water, on the viewing port foam bubbles are not observed.	Too much refrigerant in the system.	Works on drain, exhaust, and filling up to the regulated values.
	Not much of none air passing through the condenser.	Edges of radiator or condenser are plugged. The fan of radiator or condenser does not move at all.	Cleaning. Checking of pressure and RPM of the fan. Checking of direction of the fan rotation.
	Too hot elements of the condenser system.	The refrigerant flow in the system is plugged.	Checking of the line.
Too low filling pressure	Though condenser if not hot, there are many foam bubbles on the viewing port.	Deficiency of the refrigerent in the system.	Checking of leakage presence. Refilling of the refrigerant. .
	After the compressor stop, high low pressure become identical. Low pressure is higher than under the normal condition.	Malfunction of the valve of the compressor filling. Defect of the compressor sealing.	Replacement of the compressor.
	Outlet of the expansion valve does not set, and low pressure manometer is in the state of vacuum.	Malfunction of the expansion valve Penetration of moisture into the system.	Replacement of the expansion valve. Works on drain, exhaust and filling up to the regulated values.
Too low outlet pressure (on the part of low pressure)	Though condenser if not hot, there are many foam bubbles on the viewing port.	Deficiency of the refrigerent in the system.	Repair of leakage places. Works on drain, exhaust and filling up to the regulated values. Refilling of the refrigerant.
	Expansion valve does not set, and on the side of low pressure it is not cold. Low pressure manometer is in the state of vacuum.	Freezing of expansion valve. Malfunction of expansion valve.	Replacement of expansion valve.
	Filing temperature is low and air does not enter from the fan. Expansion valve sets.	Freezing of condenser Blocking of expansion valve.	Checking of the condenser thermode Cleaning and replacement.
	Outlet of receiver-dehydrator is cold, and inlet - warm (at operation everything should be warm).	Blocking of receiver-dehydrator.	Replacement.
Too high outlet pressure	Temperature of the hose and connecting part on the side of low pressure is lower than temperature of the condenser.	Expansion valve is open for too long Loosing of tightening of the sensor ballon of the expansion valve temperature.	Repair or replacement.
	When cooling of the condenser with water, outlet pressure falls down.	Too much refrigerant in the system.	Works on drain, exhaust and filling up to the regulated values.
	As soon as the compressor stops, pressure of the sides is equated: high and low pressure (during operation high and low pressure manometers are changed).	Malfunction of the lining Malfunction of the high pressure valve. Penetration of foreign substances into the high pressure valve.	Replacement of the compressor.
Too high outlet pressure and filling pressure	Not much air passing through the condenser.	Blocking of edges of radiator and condenser The fan of radiator or condenser does not move at all.	Cleaning of radiator and condenser Checking of pressure and RPM of the fan Checking of direction of the fan rotation.
Too high outlet pressure and filling pressure	When cooling condenser with water, on the viewing port foam bubbles are not observed.	Too much refrigerant in the system.	Works on drain, exhaust and filling up to the regulated values.
Too low outlet pressure and filling pressure.	Hose and pipeline end on the side of low pressure is colder that condenser.	Blockinh or bending of the hose on the side of low pressure.	Repair or replacement.
Too low outlet pressure and filling pressure.	Temperature around the expansion valve when compared to temperature around receiver-dehydrator is too low.	Blocking on the side of high pressure.	Repair or replacement.
Refrigerant outflow	Clogging of the compressor muff.	Leaking of the compressor shaft cake.	Replacement of the compressor.
	Clogging of the compressor bolt connections.	Leaking around bolt connections.	Tightening of bolts or replacement of the compressor.
	The compressor lining is filled with oil.	Leaking of the lining.	Replacement of the compressor.
Compressor burning	Internal side of the compressor and hose are burned till blackness.	System pinching or leaking.	Cleaning of the whole system, replacement of the hose and rubber items.