Possible malfunctions of the system of air-conditioning and measures on their elimination
 Compressor steps - low pressure
In an observation port there occurs a plenty of foam and on a line of the condenser high pressure, the temperature is low.
Reason:
Shortage of the refrigerant.
Way of elimination:
To fill with the refrigerant up to the regulated value and to test for outflow of gas.
Low pressure on the part of low pressure: in an entrance aperture of expansion valve there is a hoarfrost; an exhaust outlet of the evaporator is not in a cold condition.
Reason:
Blocking of expansion valve.
Way of elimination:
To clear and adjust expansion valve.
Exhaust outlet of expansion valve is in a cold condition; the low pressure manometer shows vacuum.
Reason:
Outflow of gas of the ballon of the expansion valve thermode.
Way of elimination:
To replace the expansion valve and to fill with the refrigerant.
After stop of the compressor, high and low pressure at once turn to identical pressure.
Reason:
Damage of sucking and exhaust valves of the compressor. Combustion of sealants of the compressor head.
Way of elimination:
To replace valves of the compressor and after replacement of a sealant to fill with the refrigerant.
The area of connection of a flexible low pressure hose in comparison with an exhaust outlet of the evaporator is colder.
Reason:
The pipeline of low pressure is crumpled.
Way of elimination:
Replacement.
Compressor steps - high sucking pressure
The low pressure hose in comparison with expansion valve or the evaporator is colder.
Reason:
Excessive opening of expansion valve.
Way of elimination:
Adjustment and replacement.
The temperature of external air is high and value of pressure is high on the part of high pressure. However, at douche by water of the condenser, value of pressure falls on the part of high and low pressure.
Reason:
It is a lot of refrigerant.
Way of elimination:
To let out the refrigerant up to the regulated value.
At a stop of the compressor, value of pressure of high and low pressure become identical.
Reason:
Damage of the head sealant when the high pressure valve is damaged or into the valve foreign substances when bad contact between the ballon of the expansion valve thermode and the pipeline of low pressure, have got.
Way of elimination:
To replace the sealant and the valve. At hit of foreign substances to remove them after disassembly of the compressor, and at combustion of the valve - to replace it.
Compressor steps - low sucking pressure
Under viewing glass it is a lot of foam; there is no heat on the pipeline of a high pressure. Expansion valve also is not so cold.
Reason:
Lack of the refrigerant.
Way of elimination:
After having filled with the refrigerant up to the regulated amount, test for outflow.
When there is a lot of hoarfrost in the field of inlet of the expansion valve.
Reason:
Blocking of the expansion valve and bad adjustment.
Way of elimination:
Adjustment and replacement of the expansion valve.
The low pressure pipeline is not cold and the low pressure manometer shows vacuum.
Reason:
When there is an outflow of gas from the ballon of the expansion valve thermode.
Way of elimination:
To replace the expansion valve.
The temperature of an exhaust outlet of the evaporator is excessively low, thus air either does not leave, or tepid air leaves.
Reason:
On the evaporator it is a lot of hoarfrost or blocking of edges of the evaporator.
Way of elimination:
To stop the compressor, and to start only the fan until ice will thaw and to check up adjustment of temperature by the temperature regulator and changing the work of the compressor.
Compressor steps - high values of pressures on the side of high and low pressure
Bad cooling of the condenser.
Reason:
Either on the condenser edges the dirty or foreign substances have stuck, or it is badly ventilated because of dents on edges.
Way of elimination:
To clean the condenser of foreign substances, to correct dents with a screw-driver with a straightline slot (for the best ventilation).
Even at cooling of the condenser with water under viewing glass, there does not pass foam.
Reason:
Too much refrigerant.
Way of elimination:
To let out the refrigerant up to the regulated value.
The temperature of external air is too high and temperature loading is big.
Reason:
The temperature of external air is too high. (When checking the air-conditioner, carry out in the closed place where it is not aired).
Way of elimination:
According to the properties of the refrigerant, it is impossible to remove, and maintenance service is carried out in well aired places.
Compressor steps - low pressure values of on the high and low pressure side
Pressure of the low pressure hose is lower in comparison with pressure of the expansion valve and the evaporator.
Reason:
There are corked places on the low pressure side.
Way of elimination:
Repair or replacement of faulty parts.
The difference in temperature between the inlet of the expansion valve and temperature of an exhaust outlet of the condenser is more than by on 5°C.
Reason:
Corking of the high pressure line.
Way of elimination:
Repair and replacement of the pipeline in places of corking.
Compressor steps - refrigerant outflow
Outflow of the compressor gas.
A lot of dirt becomes covers the parts of the shaft condensation and gas quickly disappears from the system.
Reason:
Outflow of gas because of bad condensation of a shaft and quickly disappears gas from system.
Way of elimination:
Replacement of carbonic sealants of a shaft and replacement of the compressor.
On bolt connections there is some oil and dirt.
Reason:
Outflow of gas from bolt connections.
Way of elimination:
To check up whether there are twirled by the regulated moment the bolt connection. If it is twirled by the regulated twisting moment, to replace the compressor.
Magnetic muff - noise appearance
On a wheel muff there is warmth, color from high temperature changes, with the certain interval there is a metal noise.
Reason:
The wheel is beaten about magnetic muff.
Way of elimination:
Repair or replace.
Irrespective of control actions at some turn it does not adjoin. And at contact there is a big noise.
Reason:
Bad contact of a muff wheel with the muff.
Way of elimination:
Replacement or adjustment of a backlash of a muff disk.
Noise arises also at idle magnetic muff.
Reason:
Deterioration of bearings.
Way of elimination:
Replacement of bearings or replacement of the compressor in gathering.
Bad coupling of the magnetic muff.
The muff is not linked, despite that on the main coupling muff line the pressure and grounding in a normal condition moves.
Reason:
Breakage in a winding.
Way of elimination:
To replace the coil or the compressor in gathering.
It is not linked irrespective of operating conditions.
Reason:
Breakage of wires or bad action of SWITCH.
Way of elimination:
Repair of a site of breakage or replacement of SWITCH
By pressing with a hand, the muff disk does not touch.
Reason:
The backlash between the muff disk and the muff wheel is big.
Way of elimination:
Adjustment of a backlash and replacement of the muff details.
Slipping of the magnetic muff
Slips only at rotation.
Reason:
Easing of voltage of the storage battery and replacement or adjustment of a backlash of the muff disk.
Way of elimination:
Charging of the storage battery and replacement or adjustment of a backlash of the muff disk.
The condition of compression seems heavy, even at touching up to the compressor, the difference of temperature is nit much felt, and as a whole, there is a lot of heat.
Reason:
Force of the compressor or internal malfunction of the compressor is excessively great.
Way of elimination:
Adjustment of the refrigerant amount. Creation of good conditions of the compressor aeration. Thus, try not to operate long time with low speed. At internal malfunction of the compressor - repair or replacement.
The compressor belt is weakened.
Reason:
Bad adjustment or deterioration of a belt.
Way of elimination:
Adjustment or replacement of a belt.
At sticking oils or alien substances on the muff it is cleaned with a solvent.
Exhaust outlet of the expansion valve is not cold enough
If the difference of temperature between the inlet and outlet is too big, it is possible freezing.
Reason:
Corking of the expansion valve.
Way of elimination:
Adjustment and replacement.
Almost none temperature difference between inlet and outlet of the valve.
Reason:
At the big insufficiency of a gas - refrigerant in the refrigerating cycle; at the big insufficiency of gas in a cylinder of the expansion valve thermode; at wide disclosing of the expansion valve.
Way of elimination:
At insufficiency of a gas - refrigerant check sites of outflow, and after repair fill up to regulated value. And at malfunction of the expansion valve, adjust or replace it.
The site of the inlet of the expansion valve is too cold and becomes covered by hoarfrost
Thus, the valve frequently opens.
Reason:
Corking of the expansion valve or outflow of gas from the thermode cylinder.
Way of elimination:
Adjustment or replacement of the expansion valve.
The high pressure pipeline is colder than external air.
Reason:
The tube of a high pressure is corked or crumpled.
Way of elimination:
Repair or replacement of the corked pipeline.
At feeling between the receiver - dehydrator and the high pressure pipeline there is almost no warmth.
Reason:
Corking of the high pressure pipeline or the receiver - dehydrator.
Way of elimination:
Replacement of the high pressure pipeline or receiver - dehydrator.
Expansion valve - outflow of gas.
At covering with pollution and oils of sites of welding and connections.
Reason:
Cracks on a site of welding and combustion of a sealant on sites of connections.
Way of elimination:
Replacement of the valve or sealant.
Noise at work
Not freely the shaft of the compressor rotates.
Reason:
Burning of the sites of rotation because of insufficiency of greasing of the compressor.
Way of elimination:
Replacement of the compressor.
The moment of rotation force of a shaft is too big.
Reason:
Excessive deterioration of a shaft or the bearing.
Way of elimination:
Replacement of the compressor.
There is a noise in the head of the cylinder.
Reason:
There is a lot of oil.
Way of elimination:
Check amount of oil and adjust up to the regulated value.
Attention: the Regulated amount of oil differs depending on the automobile model.
At occurrence of strange noise "KHAT-KHAT".
Reason:
Bad contact of the magnetic muff and the muff wheel.
Way of elimination:
Adjustment of a backlash.
At a stop of the compressor there is a noise.
Reason:
Noise of a disk of the magnetic muff.
Way of elimination:
Adjustment of a backlash.
At slow rotation by a hand as if it is hooked.
Reason:
Deterioration of the bearing.
Way of elimination:
Replacement of the bearing
At continuous occurrence of strange sounds "KHAN-KHAN" during movement.
Reason:
Occurrence of a strange sound from the pipeline because of excessive pressure in a cycle of cooling; easing of a tension of a belt of a pulley of the conditioner.
Way of elimination:
Adjustment of the amount of the refrigerant and the belt of the air-conditioner.
Occurrence of noise from the fan or the electric motor.
Reason:
Catching the deformed casing of the fan, defect of brushes.
Way of elimination:
Replacement of the fan or the electric motor.
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