The desiccant compressed air dryer dries compressed air according to the principle of variable pressure desiccant. Under certain pressure, the compressed air flows through the adsorbent (drying) bed from bottom to top.

Desiccant air dryers consist of two pressure vessels, which are both filled with desiccant (alumina and molecular sieves) and are alternately operated via switch-over.

The wet compressed air flows through a vessel, under high pressure and low temperature, the moisture is thoroughly removed by the desiccant (desiccant), so the compressed air will be dry.  At the same time, the moisture stored in the desiccant of the second vessel is removed (regeneration) with low pressure, so the desiccant is regenerated. If the desiccant in the vessel in which desiccant takes place is saturated with moisture, the vessels are switched and the process starts again. One complete run of desiccant and regeneration in a vessel is called a cycle, and the time required is the cycle time. The switching period is 120~240 minutes (can be set separately as needed), and the action will be displayed on the front panel of the controller.

This series of heated desiccant compressed air dryer adopts an intelligent controller with advanced microcomputer technology to control air-drying process automatically, improve the air purification effect and reduce power loss.

1. The user pours the concrete foundation according to the size of the equipment and needs the ground screws to fasten, the equipment shall be placed in a ventilated place indoors (at least 1meter from the wall)
2. When installing the equipment, attention should be paid to the versatility of the barrel.
3. The equipment shall be fastened firmly, and shall be fastened again after a period of use.
4. Install the pipeline as straight as possible (many elbows will cause some loss to the flow and pressure of the equipment).
5. To ensure safety, non-safety voltage electrical parts, etc. should be effectively grounded. Grounding requirements are as specified.
6. The pipe height must be lower than the outlet height of the equipment, otherwise it will cause part of the liquid back flowand affect the regeneration effect. It is necessary to prevent rainwater and so on from entering.

Pre-commissioning preparation

Check each running part, instrument control system, intelligent controller, grounding unit, etc. before commissioning, if damaged, out of order, should be repaired.

Several related valve adjustment

• Adjust the starting pressure of safety valve to 1.05 times of the inlet pressure.
• Adjust the pneumatic shut-off valve for the operation of the inlet pressure of 0.3 ~ 0.5 Mpa (factory has been adjusted)
• Adjust the ball valve Q, so that the regenerated gas volume of about 4 ~ 6%.
• Switch the valve inlet pressure needs to be adjusted, first pull up the regulator on the knob, and then left (reduce) or right (increase) to adjust the finished press down the knob.

• This device should be used in the room that with no danger of explosion, with no media that may cause corrode the metal.
• As the pneumatic working pressure of the pneumatic shut-off valve is 0.3~0.5Mpa, the pressure gauge indication on the filtering pressure reducing valve should be checked frequently to prevent damage to the cylinder by over pressure.

• After long-term operation, when the operating parameters of the drying system remain unchanged and the equipment works normally, but the dry air cannot reach the dew point requirement, that is, the desiccant has failed and needs to be replaced and updated.
• When the regenerated desiccantcylinder discharges exhaust gas, its pressure should be ≤05Mpa. If the pressure exceeds this value, the muffler should be removed to clear the dust. Make the gas flow resistance small, replace the cartridge or muffler if necessary, generally the exhaust pipe and muffler should be connected to the outdoor, especially the inlet volume flow is less than 10m³ must be connected to the outdoor, but the pipe must be lower than the regeneration outlet height.
• Pay attention to the maintenance of the safety valve.
• The two desiccantcylinders should be inspected regularly according to the pressure vessel testing procedures.
• Manual drainage at least 1-2 times per shift
• This equipment needs to be grounded effectively as required.
• The intelligent control instrument must often clean dust (pay attention to first cut off the power supply) and regularly check whether the rear panel plugs and plugs are well connected, and promptly repair any faults.
• maintenance, must cut off the power supply (including the power into the controller) to avoid unnecessary injury.
• Switching valve The dryer adopts double cylinder switching to complete the adsorbent desiccantand regeneration so that the cycle alternates. The switching valve is the most frequent and important part of the machine, therefore, daily maintenance should be paid attention to. There are 4 pneumatic valves on the dryer, 2 normally open type and 2 normally closed type, which are strictly debugged at the factory, generally speaking, there should not be any problem with the machine itself, the valve control gas inlet pressure is required to be 0.3~0.5Mpa, if it is too small, the operation will fail. In addition to this, there is still a failure, please check the control system first, such as power supply, solenoid valve, controller, etc. is normal.

Replace Alumina and molecular sieve every year. Other valves for backup.