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Basic Knowledge

Routine Maintenance of Air Dryer

Time: 2020-11-17

Observation record

1.Observe and record the meter value 4 times per shift

(1)The pressure difference between the compressed air inlet and outlet does not exceed 0.035Mpa;
(2)Evaporation pressure gauge 0.4Mpa-0.5Mpa; high pressure pressure gauge 1.2Mpa-1.6Mpa. (Refrigerant R22)
(3)The operating current and voltage of the compressor.

2.Frequently observe the inlet temperature of the cooling water system and compressed air system

(1)The cooling water temperature is 2~32℃; the ambient temperature is 2~38℃.
(2)Water pressure 0.2~0.4Mpa; flow rate not less than 0.15T/m³.h.
(3)The inlet temperature of compressed air should generally be ≤45°C (it is advisable to touch the inlet pipe by hand to prevent it from being hot), except for special exceptions.

3.Frequently observe the refrigeration system

(1)Touch the compressor by hand at least once a day. Normally it is cold and frosty;
(2)The temperature difference between the two sides of the filter dryer should be touched by hand every week, and the temperature difference should not be too large (the inlet is hot and the outlet is cold, and it needs to be replaced);
(3)The cold dryer should always observe the drainage and sewage system. The float drainer should be cleaned once a week; the sewage pipe should be drained once a week. Keep the drainage system open at all times to prevent accumulation of water.
(4)If you find abnormal sound or hotness from the compressor, you should contact the after-sales service department as soon as possible.



1.Enough space for ventilation and heat dissipation should be ensured around the wind condenser, and it cannot work under direct sunlight. The wind condenser needs to be regularly blown off the dust on its heat sink with compressed air (from inside to outside, compressed air for cleaning) The flow and pressure should not be too high, try to avoid crushing the fin surface of the condenser, so as to achieve the best heat dissipation effect.

2.Cleaning of automatic drain

(1)Close the ball valve in front of the drain, loosen the fixing screw on the drain, and release the compressed air in the drain;
(2)Unscrew the drain cover, then take out the drain core and clean it with clean water and a soft brush;
(3)After cleaning, reinstall it as it is, and open the front ball valve.
Note: The importance of the drainage system: When the condensed water is removed from the dryer, it cannot be drained in time. The flow rate of air brings the condensed water out of the dryer to the user's air point, so that the air source contains water.

3.Cleaning of Y-type filter. The Y-type filter in front of the cooling water inlet and the automatic drain will accumulate impurities after being used for a period of time. The former increases the water flow resistance and affects the water flow, and the latter makes the drainage clogged. The filter element should be cleaned regularly. And replacement. The newly installed equipment needs to be inspected and cleaned frequently due to dirty pipelines.

4.Cleaning method of electronic drainer:

(1)Close the ball valve in front of the automatic drain;
(2)Loosen the upper fixing nut and take out the timing coil. During the cleaning process, the coil should never be in contact with water, otherwise the coil will burn;
(3)Pull out the hose, loosen the drain valve body, and vent the compressed air in the drain;
(4)Remove the valve core and wipe it clean;
(5)Screw the valve body back to its original position, slightly open the front ball valve, and use compressed air to empty the impurities, water and oil in the drainage system; wipe the valve body with a rag;
(6)Reinstall the valve core and timing coil in their original positions; then install the hose and open the front ball valve.

5.The cooling water should be kept clean; the Y-type filter should be cleaned once every half month, and the water quality should be good once a month; the water condenser should be cleaned once a year (depending on the water quality), and the wind condenser should be cleaned once a month; Cleaning of water condenser. Shell and tube water condenser cleaning: close the cooling water inlet and outlet, open the end cover of the unconnected water pipe, the outside of the end cover and the gasket only need to be cleaned with water; the inside of the copper pipe is cleaned with gas, water or a stick with a rag; cleaning Attention should be paid not to use too much force to avoid breaking the internal copper pipe.

6.Cleaning the dryer. Use a clean towel to wipe off oil and dust on the surface of the equipment regularly. Remove the dust and oil from the installation of the cold dryer and the ground to keep the environment tidy.


Maintenance and overhaul

(1)When the air pressure drop at the inlet and outlet of the precision filter reaches 0.05 MPa or reaches its service life, the inner filter element of the air filter needs to be replaced; the normal service life of the filter element: 6000-8000 hours; (three months for first installation and commissioning Replace the pipeline filter)
(2)The temperature probe, drain, solenoid valve and other vulnerable parts need to be spare parts.
(3)Develop a maintenance plan, check the dryer fasteners, motor insulation, and circulation system for leaks.