A dehumidifier for a compressor is a kind of filter that allows it to perform the function of preparing air before it is directly supplied to the system. The need to use this mechanism is due to the fact that high humidity has a very detrimental effect on almost any component of the compressor, which can easily damage it.
You can make a filter dehumidifier for the compressor with your own hands or simply purchase a ready-made one in a store specialized for such products.
How the device works
As stated earlier, there are many options for implementing such a mechanism, working according to different principles. A classic dehumidifier works as follows:
Homemade dehumidifier for the compressor or purchased?
If such a question arises, first of all you need to determine for yourself what level of purification needs to be achieved. Eg, modern designs , sold in stores, allow you to separate unnecessary particles up to five microns in size. There is also a filter that, when operating, is capable of stopping particles up to one tenth of a micrometer in size, but the price of such a product is, of course, extremely high.
In other words, if there is no need for extremely thorough cleaning of your compressor, then there is no need to buy expensive filters for this. Moreover, it is best to do homemade model. Certainly, the effectiveness of such a mechanism will be much smaller than that of a store-bought one, but it will be much cheaper and easier to operate.
It doesn’t matter whether you buy the device or make it yourself, you must take into account the following facts:
How to make a budget device model with your own hands?
There are a huge number of ways make your own dehumidifier for the compressor. We will consider the simplest and most popular method, which will not require you to spend a lot of effort and materials.
You will need the following materials:
- a piece of pipe with a length of about 0.7 m and a cross-section of 100 mm;
- sheet of metal whose thickness is 3 mm;
- used fire extinguisher;
- fastening parts.
After everything necessary materials prepared, you must follow the following step-by-step instructions:
If everything was done precisely according to the instructions, you should get a device that contains a filling neck and, of course, a gearbox at its top. On the bottom side there is a connecting pipe allowing air to be taken in. Be sure to check the entire structure for leaks using the connection to the compressor.
Once all the checks have been completed and no problems have been identified, you can connect the hoses and that’s it. You can start using the device.
Dryer for Airpol OP compressor - these dryers are in demand among manufacturers of PET containers. The reason lies in the use of Airpol ADP boosters on automatic and semi-automatic PET bottle blowing machines. That is, having chosen an Airpol booster compressor, the consumer usually buys the rest of the kit compressor equipment of this brand, including compressor dryers.
The Airpol OP compressor dehumidifier is simple and reliable, and this is the key to trouble-free and long-term operation of your compressor equipment.
| Model dehumidifier | Prod., m 3 /min | Attached- languishing, inch | Installation Lenya power, kW | Dimensions m | Weight, kg |
|---|---|---|---|---|---|
| Airpol OP 05 | 0,60 | G3/4 | 0,17 | 0.4x0.5x0.5 | 20,0 |
| Airpol OP 10 | 0,90 | G3/4 | 0,19 | 0.4x0.5x0.5 | 21,0 |
| Airpol OP 20 | 1,20 | G3/4 | 0,23 | 0.4x0.5x0.5 | 26,0 |
| Airpol OP 30 | 1,80 | G3/4 | 0,30 | 0.4x0.5x0.5 | 28,0 |
| Airpol OP 40 | 2,40 | G1 | 0,62 | 0.4x0.5x0.8 | 45,0 |
| Airpol OP 50 | 3,0 | G1 | 0,68 | 0.4x0.5x0.8 | 47,0 |
| Airpol OP 60 | 3,60 | G1 1/4 | 0,80 | 0.5x0.6x0.8 | 54,0 |
| Airpol OP 65 | 4,10 | G1 1/4 | 0,88 | 0.5x0.6x0.8 | 61,0 |
| Airpol OP 70 | 5,20 | G1 1/4 | 1,13 | 0.5x0.6x0.8 | 66,0 |
| Airpol OP 80 | 6,50 | G1 1/4 | 1,20 | 0.6x0.6x0.9 | 81,0 |
| Airpol OP 90 | 7,70 | G1 1/4 | 1,45 | 0.6x0.6x0.9 | 85,0 |
| Airpol OP 100 | 9,90 | G2 1/2 | 1,88 | 0.8x1.0x1.0 | 161,0 |
| Airpol OP 110 | 12,0 | G2 1/2 | 1,95 | 0.8x1.0x1.0 | 166,0 |
| Airpol OP 120 | 13,9 | G2 1/2 | 2,35 | 0.8x1.0x1.0 | 171,0 |
| Airpol OP 130 | 20,0 | G3 | 3,80 | 1.0x1.3x1.3 | 304,0 |
| Airpol OP 140 | 24,0 | G3 | 4,30 | 1.0x1.3x1.3 | 306,0 |
| Airpol OP 150 | 30,0 | G 3 | 5,30 | 1.0x1.3x1.3 | 346,0 |
| Airpol OP 160 | 35,0 | G 3 | 5,90 | 1.0x1.3x1.3 | 349,0 |
The operating conditions of the compressor dryer must meet the following requirements:
- min. temperature: + 5°C (required),
- Max. temperature: +43°C (required),
- Max. inlet air temperature: +55°C,
- min. inlet air temperature: +10°C,
- Max. operating pressure OP 40 - OP 90: 13 bar.
- Max. operating pressure OP 100 - OP 130: 16 bar
- Max. operating pressure OP 140 - OP 160: 14.5 bar
The amount of heat generated by the dehumidifier during operation is approximately 11 W for every m3 of air pumped per hour.
Airpol compressor dryer maintenance instructions
1.1. general information
The dehumidifier for the Airpol OP compressor is referred to as a dehumidifier in the following text. The manufacturer and seller do not bear any responsibility in case of failure to comply with safety rules for maintenance, transportation, operation, Maintenance and repairs, also in cases where this has not been described in detail in these Instructions. Reliable operation and service life of the compressor dryer depend on proper maintenance and inspection schedules in accordance with this Service Manual.
1.2. Compressor Dryer Safety Guidelines
Safety notices that, if not followed, could result in injury to workers or damage to equipment are indicated by the following symbols (the illustrations below show the danger areas of the compressor dryer):
Fig.1 Designation of dangerous zones of the dryer for the compressor
Except general rules Occupational safety and health regulations and the provisions of the Technical Supervision Act regarding compressor dryers, their components and equipment, the following safety instructions must also be observed.
The compressor dryer may only be serviced by suitably qualified personnel. Improper servicing by unauthorized persons and/or modifications not approved by the manufacturer will release the manufacturer from liability for damage resulting from the above actions. Operating personnel are required to comply with safety regulations. The user is responsible for maintaining the compressor dryer in a state of operational reliability at all times. Compressor parts and dryers that are not suitable for safe operation should be replaced immediately. Installation, connection, operation, maintenance and repairs of compressor dryers must only be carried out by suitably qualified personnel.
The manufacturer is not responsible, now or in the future, for any injury, damage to objects or to the compressor dryer itself caused by user negligence or failure to comply with the installation, operation and maintenance instructions contained in this manual. The manufacturer is also not responsible for non-compliance with the mandatory safety regulations regarding the dryer for the compressor and operating personnel.
Before removing the housing for maintenance work, be sure to turn off the power and reduce the pressure inside the compressor dryer. Any intervention on electrical equipment must only be carried out by qualified electricians.
Dehumidifiers for compressors of this series can be installed outdoors.
Fig.2 Elements to improve the safety of a compressor dryer
The compressor dryer is equipped with the following elements to increase operational safety:
- cooling fan shield (Fig. 2 item 1),
- shield (Fig. 2, item 2),
- grounding (Fig. 2, item 3).
1.3. Disposal of compressor dryer
The compressor dryer is designed for continuous operation. The longevity of the main components of a compressor dryer depends on their maintenance. When disposing of compressor dryer, consideration should be given to the oil and refrigerant contained in the hermetic cooling system. Before dismantling, these working fluids must be removed and handed over to a specialized recycling facility.
2. Installation of compressor dryer
2.1. Transportation
The compressor dryer should be transported in its normal operating position.
2.2. Requirements regarding the installation location of the compressor dryer
The correct choice of room affects the operating conditions of the compressor dryer. The room should be spacious, dry, well ventilated and free from contamination. The floor must be level and suitable for industrial premises; The total weight of the compressor dryer is shown in the table. The total weight of the compressor dryer should always be taken into account.
2.3. Compressor dryer installation
After preparing the room and unpacking the compressor dryer, install it in its intended location and check the following points:
- make sure that there is enough space around the compressor dryer (Fig. 3),
- make sure that the entire device is clearly visible to the operator located at the control panel and is protected from interference by unauthorized persons.
Fig.3 Differential dryer fuse for compressor
Attention: Differential fuse Fig. 3. item 1 is not supplied with the compressor dryer and is not a piece of equipment.
2.4. Compressed air connection
The connection of the compressor dryer to the compressed air equipment must be made in accordance with the markings on its body (Fig. 4).
Fig.4 Connection of dryer for compressor
Before installing a compressor dryer, you should check the air ducts connected to it. They must be free from contamination (rust, welding spatter). A pre-filter must be installed in front of the compressor dryer.
A manual shut-off valve should also be installed between the compressor dryer and the compressed air network. This will make it possible to turn off the compressor dryer while it is running. service.
The condensate drain is routed to the outside of the compressor dryer and the condensate can be drained away using a transparent hose. Condensate cannot be discharged directly into the sewer network; it must be disposed of in accordance with applicable waste disposal regulations.
2.5. Connecting the compressor dryer to the electrical network
Before connecting to electrical equipment:
- check whether the mains voltage corresponds to the value indicated on the dryer panel,
- check the condition of the power wires and the grounding condition,
- make sure there is a differential fuse that protects against excessive voltage, set to 30 mA (Fig. 3, item 1).
The compressor dryer must only be connected to the electrical network by qualified electricians. Before opening the electrical box, turn off the power. Obligatory safety standards and regulations must be strictly observed. The electrical circuit diagram is located inside the electrical box of the compressor dryer.
3 Description of compressor dryer
3.1. Manufacturer information
The manufacturer of this compressor dryer is Airpol.
3.2. Purpose of a compressor dryer
The compressor dryer is designed for drying compressed air in enterprises in industrial purposes. Dryers for compressors of this series must not be installed in an explosive environment. hazardous areas ah, as well as in places where the air contains hazardous substances, such as vapors of solvents, alcohols and other flammable substances.
These compressor dryers must not be used to prepare air in direct contact with food products. This application is possible with the installation of a series of suitably selected compressed air filters. If you have any additional questions, please contact our service department.
Compressor dryers may only be used in accordance with their intended purpose. All other uses will be considered incorrect and not in accordance with safety regulations. The manufacturer is not responsible for damage resulting from incorrect or non-intended use.
3.3. Technical data of compressor dryer
| Type | Air flow, m3/h |
R 404a, kg |
Refrigeration compressor power, W |
Fan power, W |
Rated power W |
|---|---|---|---|---|---|
| Airpol OP40 | 141 | 0,40 | 544 | 65 | 609 |
| Airpol OP50 | 180 | 0,40 | 608 | 65 | 673 |
| Airpol OP60 | 216 | 0,65 | 711 | 82 | 793 |
| Airpol OP70 | 312 | 0,65 | 996 | 126 | 1122 |
| Airpol OP80 | 390 | 1,35 | 1040 | 150 | 1190 |
| Airpol OP90 | 462 | 1,35 | 1296 | 150 | 1446 |
| Airpol OP100 | 594 | 1,90 | 1727 | 140 | 1867 |
| Airpol OP110 | 720 | 2,10 | 1800 | 140 | 1940 |
| Airpol OP120 | 853 | 2,00 | 2200 | 140 | 2340 |
| Airpol OP130 | 1200 | 3,50 | 3000 | 790 | 3790 |
| Airpol OP140 | 1440 | 3,30 | 3500 | 790 | 4290 |
| Airpol OP150 | 1800 | 5,00 | 4500 | 790 | 5290 |
| Airpol OP160 | 2100 | 4,80 | 5100 | 790 | 5890 |
Rated operating conditions of the compressor dryer:
- temperature environment+25°C,
- inlet air temperature +35°C,
- working pressure 7 bar,
- pressure dew point +3°C.
Acceptable operating conditions for the compressor dryer:
- maximum ambient temperature +45°C,
- minimum ambient temperature +5°C,
- maximum air inlet temperature +55°C,
- maximum operating pressure OP 40 – OP 90: 13 bar,
- maximum operating pressure OP 100 – OP 130: 16 bar.
- maximum operating pressure OP 140 – OP 160: 14.5 bar.
The valve (Fig. 5) is installed at the factory and does not require adjustment. The dew point value cannot be changed. Changing the valve setting will void your warranty rights.
Fig.5 Hot gas dryer valve for compressor
- cork
- adjusting screw
The following information signs are located on the compressor dryer:
- designation of pictograms (Fig. 6. item 1),
- compressed air inlet (Fig. 6. item 2),
- compressed air outlet (Fig. 7. item 3),
- shield (Fig. 7. item 4).
The signs are a safety feature and cannot be removed or damaged.
Fig.6 Dryer information signs for compressor
Fig.7 Dryer device for compressor
Dryer structure: 1 – refrigeration compressor, 2 – condenser, 3 – fan motor, 4 – evaporator, 5 – condensate separator, 6 – hot gas valve, 7 – refrigerant filter, 8 – capillary, 9 – pressure safety valve.
Fig. 8 Diagram of a dryer for a compressor
Dryer design diagram: 1A – air inlet, 2A – air outlet, 3A – condensate drain, 1 – refrigeration compressor, 2 – condenser, 3 – fan motor, 4 – evaporator, 5 – condensate separator, 6 – contaminant accumulator, 7 – capillary , 8 – refrigerant filter, 9 – hot gas bypass, 10 – air-to-air heat exchanger, 11 – dew point thermometer, 12 – fan switch, 13 – condensate drain valve.
The compressor (1) compresses the refrigerant (gas), which enters the condenser (2), where it is condensed. If necessary, the fan (3) is started to increase the efficiency of the refrigerant. The condensate passes through the dewatering filter (8), after which it expands in the expansion valve located in the capillary (7). After this, it enters the evaporator (4), where the cooling process occurs. The refrigerant expanded in the evaporator is sucked in and compressed again by the compressor. The system is equipped with a refrigerant bypass. This allows the amount of refrigerant in the system to be adjusted to the actual volume of compressed air currently passing through the compressor dryer.
This happens by introducing hot gas through the control valve (9). The valve maintains constant refrigerant pressure in the evaporator so that the dew point never falls below 0°C, which prevents the refrigerant in the evaporator from freezing.
The compressor dryer operates in an automatic cycle. By default the dew point is set to +3°C.
3.7. Compressed air movement
The supplied compressed air in a saturated state enters the evaporator (4) (for compressor dryers from OP40 to OP80 in the main heat exchanger (10)), where it is cooled below the dew point temperature, after which it enters the condensate separator (5). The separator separates condensate from air. The cooled air is returned through the exhaust pipe to the equipment. The condensate is discharged outside through the condensate drain valve (13), equipped with a time relay.
3.8. Example of compressed air equipment - installing a dryer for the compressor behind the air collector
Fig. 9 Placement of the compressor dryer behind the air collector
Compressed air equipment with a compressor dryer installed behind the compressed air receiver; 3 – filters: coarse and fine filters, 4 – bypass and shut-off valves.
3.9. Example of compressed air equipment - installation of a compressor dryer in front of the air collector
Fig. 10 Placement of the compressor dryer in front of the air collector
Compressed air equipment with a compressor dryer installed in front of the compressed air receiver; 3 – filters: coarse and fine filters, 4 – bypass and shut-off valves.
Bypass and shut-off valves (Fig. 9, 10. item 4) make it possible to service filters without interrupting the flow of compressed air. Before replacing filter elements, you should always check that the relevant valves are properly closed. The equipment shown in Fig. 9 is recommended in case of continuous operation of the compressor and continuous intake of compressed air. In this situation, constant loading of the dehumidifier is ensured.
The equipment shown in Fig. 10 is recommended when the air intake differs over time, and the one-time demand is significantly higher or significantly lower than the rated compressor capacity. The tank must be large enough to provide required amount dried air.
4. Compressor dryer operation
Before starting the compressor dryer, check:
- correct connections in the compressed air network: remember to remove all packaging elements,
- correct connection to the network,
- condensate drain system,
- correct connection to the electrical network,
- familiarize yourself with the control panel.
Fig. 11 First start of the compressor dryer
Control panel: 1 – Dew point temperature indicator, 2 – STOP OPERATION button.
Wait at least 6 hours after transport before turning on the compressor dryer.
4.2. Starting the compressor dryer
The compressor dryer is turned on using the STOP OPERATION button on the control panel (Fig. 11, item 2). After about 5 minutes the dehumidifier can be loaded, including the compressor. Only in in this case Condensation will not appear in the compressed air network. The dehumidifier must operate during the entire operating time of the compressors.
After turning off the compressor dryer, wait at least 5 minutes before restarting it to equalize the pressure in the cooling system.
5. Compressor dryer maintenance
The instructions for periodic maintenance when installing and starting up the compressor dryer must be strictly followed. Failure to follow instructions will result in loss of warranty rights. Before carrying out maintenance or repair work, the compressor dryer must be stopped completely and disconnected from the compressed air supply and the electrical network.
5.1. Periodic Inspection Schedule for Compressor Dryer
The specified periodic inspection periods are based on compressor dryers operating in optimal conditions working environment (rooms free from dust, well ventilated). In other cases, inspections should be done twice as often.
Weekly:
Draining condensate: Clean the dirt trap filter.
Monthly:
Condenser: Clean the cooling fins from dust.
5.1.1. Automatic condensate drain
Before carrying out any maintenance or repair work, the compressor dryer must be completely stopped and disconnected from the compressed air supply.
Cleaning the automatic condensate drain filter - procedure:
- close the valve (Fig. 12. item 1),
- reduce the pressure in the dryer by pressing the "TEST" button on the condensate drain time relay (Fig. 12. item 2),
- turn off the dryer by pressing the STOP button (Fig. 12, item 3),
- remove the plug (Fig. 12. item 6),
- remove the filter (Fig. 12. item 7),
- clean the filter by blowing a stream of compressed air from the middle outwards,
- install the filter and insert the plug,
- close the walls.
Fig. 12 Automatic drainage of condensate at the compressor dryer
5.1.2. Capacitor
Cleaning the condenser - procedure:
- turn off the compressor dryer by pressing the STOP button (Fig. 12, item 3),
- turn off the power button (Fig. 12. item 4),
- remove the walls of the dryer (Fig. 12. item 5),
- clean by blowing compressed air through the condenser fins. Do not use water or other solvents.
- close the walls.
5.2. Long breaks in work – a decrease in pressure.
If the compressor dryer will not be used for a long period of time, you should:
- close the valve
- reduce pressure,
- turn off the dehumidifier,
- turn off the power button.
In case of long breaks in operation, the compressor dryer should be protected from exposure to negative atmospheric factors, dust and moisture. Before restarting the compressor dryer after a long period of inactivity, please contact the PPS Airpol service.
6. Compressor dryer diagnostic chart
Actions indicated by the # symbol must be performed by an authorized service.
1) Sign: No compressed air comes out of the compressor dryer.
1) Possible reason: Pipes inside the compressor dryer are frozen. The hot gas bypass is damaged or misregulated. The room temperature is too low and the evaporator tubes are frozen.
1) Remedy:# check the hot gas valve. Check the room temperature.
2) Sign: Condensation has appeared in the compressed air network.
2) Possible reason:
2A) The condenser separator is not working properly.
2B) The dryer is not correctly selected for the needs of the compressed air line.
2C) The compressor dryer operates in bad conditions condensation formation.
2) Remedy:
Clean the filter before solenoid valve, # check the outlet valve, # check the release time relay.
Check the amount of air passing through the compressor dryer. Check the room temperature. Check the air temperature entering the compressor dryer. Clean the condenser.
# Check the operation and installation of the pressure switch.
# Check fan operation.
3) Sign: The cooling compressor head is too hot (> 55°C).
3) Possible reason:
3A) There is no refrigerant in the cooling network.
3) Remedy:
# Check for refrigerant leaks.
# Replenish if necessary.
4) Sign: The motor shuts down when overloaded.
4) Possible reason:
5) Sign: The engine hums but does not turn on.
5) Possible reason:
5A) The mains voltage is too low. The compressor dryer is turned off and turned on after too short a period of time to equalize the pressure inside the unit.
5B) The engine switch is damaged.
5) Remedy:
Contact your electricity supplier.
Wait a few minutes before turning the dehumidifier back on.
# Check capacitor relay (if installed).
6) Sign: The dehumidifier stops but does not start automatically after a few minutes.
6) Possible reason:
6A) Temperature switch in position manual control has disconnected the engine power supply See 2B – 2C – 3A.
6B) Engine damage.
7) Sign: The refrigeration compressor is too loud.
7) Possible reason: Damaged internal parts or valves.
Do you constantly drain condensate from the pneumatic line?! Installing a compressor dryer is correct solution! But before you buy the model you like, consult with us, since the dryer for the compressor is selected not just according to the declared performance, but taking into account certain correction factors for pressure, temperature and compressed air consumption. An incorrect calculation will result in either freezing of the pneumatic line, or the dew point will be higher than +3°C.
We sell industrial dryers for compressors in Tyumen, Novokuznetsk, Irkutsk, Zelenogorsk, Ulan-Ude, Ishim, Magnitogorsk, Khanty-Mansiysk, Yakutsk, Yekaterinburg, Nakhodka, Petropavlovsk-Kamchatsky, Biysk, Blagoveshchensk, Surgut, Salekhard, Rubtsovsk, Leninsk- Kuznetsk, Lesosibirsk, Ust-Ilimsk, Belovo, Gorno-Altaisk, Kurgan, Achinsk, Norilsk, Nefteyugansk, Abakan, Chita, Tobolsk, Anzhero-Sudzhensk, Vladivostok, Komsomolsk-on-Amur, Khabarovsk, Ussuriysk, Krasnoyarsk, Bratsk, Kemerovo, Angarsk, Nizhnevartovsk, Tomsk, Omsk, Prokopyevsk, Novy Urengoy, Chelyabinsk, Zheleznogorsk, Kogalym, Kiselevsk, Barnaul, Vorkuta, Solikamsk, Kansk, Nizhny Tagil, Yuzhno-Sakhalinsk.
Air receiver 40 atm. On our website you can familiarize yourself with the current rules for the safe operation of air receivers and pressure vessels.
9.1. Air Dryer.
Purpose.
An air dryer, shown in Figures 211 and 212, is installed in air brake systems to dry and clean the air coming from the air compressor and to regulate the operating pressure in the brake system.
Figure 211. Appearance And internal structure air dryer.
Designations: 1 - Inlet; 2 - Control piston;3 - Outlet;4 - Channel;5 - Channel; 6 - Muffler; 7 - Exhaust;8 - Exhaust valve;9 - Moisture separation chamber;10 - Check valve; 11 - Jet; 12 - Ring filter; 13 - Drying agent; 14 - Air regeneration receiver; 15 - Adjustment screw. Inlets: 1 - Supply inlet; 21 - Outlet (to the four-circuit safety valve); 22 - Branch (to the regeneration air receiver); 3 - Atmospheric outputThe use of an air dryer eliminates the need to use moisture removal equipment based on additional cooling and automatic condensate drain valves, as well as additional antifreeze (alcohol) injection equipment.
The advantages of a dehumidifier over traditional air conditioning are as follows.
There is no corrosion of brake system elements caused by condensation.
The number of failures in the operation of components and assemblies of the brake system is reduced due to the absence of condensate and oil film.
Low maintenance costs.
Pressure regulation occurs in a zone of purified air, as a result of which the likelihood of malfunctions in the operation of the pressure regulator is reduced.
Air dehumidification occurs due to the adsorption of moisture at the molecular level by a drying agent (13). Compressed air passed through granular, highly porous powder. During this process, any water vapor in the air is deposited on the granules. To regenerate the powder, part of the dried air is discharged into the atmosphere, passing through the powder in the opposite direction. As a result of the decrease in pressure, the partial pressure of water vapor in the regenerating air (i.e., the dryest possible air) also decreases, which allows this air to absorb moisture deposited on the granules.
Figure 212. Structure of the dryer
Air dehumidification in the discharge phase.
Served air compressor air passes through the supply inlet 1 (the pneumatic diagram is shown in Figure 214) first through the ring filter (12), where it occurs pre-cleaning from contamination such as carbon deposits and oil. In addition, the air is cooled in the ring filter (12) and part of the moisture contained in it is collected in the moisture separation chamber (9). The air then passes through the granular powder (13) - where dehumidification occurs - to the check valve (10); opens it and goes through the outlet 21 to the air receivers of the brake system. Simultaneously through the nozzle (11) and the outlet 22 air receiver is being filled (14) small size for regeneration. Air purification and preliminary removal of moisture in the ring filter (12) has a positive effect on the service life and efficiency of the powder (13).
Air regeneration in the cleaning phase.
When the pressure in the brake system rises to an appropriate level, the so-called cut-out pressure, the integrated pressure regulator opens the relief valve (8). The air pumped by the air compressor and the compressed air from the air dryer are released into the atmosphere through the outlet (7) and the atmospheric outlet 3, while capturing the accumulated moisture, oil and most of the dirt particles settled in the filter.
Dry air from the regeneration air receiver (14) passes through the outlet 22 and jet (11) and fills all free space. Penetrating through wet powder granules (13), air absorbs moisture deposited on the surface of the granules before being released into the atmosphere through the ring filter (12) and the discharge valve (8).
The check valve (10) prevents the reverse flow of compressed air from the air receivers.
Noise reduction.
Thanks to the integrated silencer (6), the noise generated when the dump valve (8) opens is significantly reduced. In this case, a multi-stage throttle muffler is used, the design of which protects against high-speed pressure pressure, which can cause contamination and thereby weaken the efficiency of the air dryer.
Operation of the integrated pressure regulator.
Due to the pressure in the receiver, the control piston (2) moves and the air passes through the channel (4). As soon as the pressure reaches the cut-out pressure, the control piston (2) moves to the right and opens the outlet (3). In this case, the control piston (2) closes the inlet (1) leading to the ventilation hole, no leakage occurs. As a result, compressed air is supplied through the channel (5) to the relief valve (8), opening it. As soon as the receiver pressure drops to the cut-in pressure level, the spring of the control piston (2) forces it to move to the left, thereby opening outlet (1) and closing outlet (3). The air above the exhaust valve (8) exits through channel (5), inlet (1) and vent(15); the cleaning valve closes.
Shut-off pressure and overpressure The regulator is determined by the spring load and the movement of the control piston. Both values are achieved - largely independently of each other - by means of the adjusting screw 15.
Safety valve.
In the event of a malfunction, the pressure regulator, the safety valve - consisting of a relief valve (8) and a valve compression spring (7) - ensures that the pressure in the receiver is limited, releasing the incoming air into the atmosphere as soon as the pressure reaches the opening pressure (emergency pressure).
Heater operation.
To prevent freezing of the relief valve (8) under unfavorable conditions weather conditions use an electric heater installed in the air dryer body at the location of the discharge valve (8) (not shown in the figures). The heater is turned on from the ignition switch, the temperature is controlled by an automatic built-in thermostat. Various modifications of the heater are possible. The heater is shown in Figure 213.
Figure 213. Appearance and internal structure of the heating element
When the ignition switch is turned on, the heating is controlled by a reverse current thermal relay. So that when parking vehicle the battery has not been discharged, the heating current should turn off when the ignition switch is turned off. The heater can be built in additionally.
Installation.
General instructions.
Installing an air dryer increases the volume of the brake system (volume of the air dryer plus the regeneration air receiver). This increases the filling time of the brake system by approximately 3% to 7%. It is therefore necessary to check whether the permissible filling time of the brake system is being maintained.
In addition, the average duty cycle of the pressure regulator when installing an air dryer should not exceed 50%, since if the pumping time is increased, there may not be enough time for regeneration. At a duty cycle of 50% to 60%, it is not possible to install an air dryer.
The installation location of the dryer in the vehicle brake system is shown in Figure 214.
Regeneration air receiver parameters.
When installing the regeneration air receiver, the following must be taken into account:
Volume of air receivers of the brake system;
Pressure regulator overpressure;
Pressure regulator cut-out pressure;
Average duty cycle of an air compressor before installing an air dryer.
The diagram can be used to determine the parameters of the regeneration air receiver when general values cut-off pressure and total system volume (shown in Figure 215).Recommended regeneration receiver for an average duty cycle of 40% and overpressure = 1 bar.
Connecting pipeline.
To connect an air compressor to an air dryer, and an air dryer to a four-circuit safety valve, a 18x1.5 mm pipeline is recommended. The length of the air compressor pipeline depends on the permissible air temperature of the inlet in inlet 1. Typically, a pipeline with a length of 4 to 6 meters is used. To avoid water accumulation, this pipeline must be positioned with a constant slope towards the air dryer. To protect the air dryer from vibration of the air compressor, the discharge pipe is made flexible, and it must be resistant to high pressures.
Several versions of air dryers are provided with drain pipes at atmospheric outlet 3 to drain accumulated condensate. However, it is necessary to take into account more high level sound when disconnected. Sound reduction can be achieved by using a longer hose or a separate muffler on the hose.
For all noise reduction measures, it is necessary to ensure a dynamic pressure on inlet 1 that does not exceed 0.25 bar during the pressure release phase (regeneration phase). Therefore, the location for installing the air dryer must be selected so that it is possible to install a device with an integrated muffler, without an outlet pipe at atmospheric outlet 3.
Figure 214. Location of the dryer on the vehicle pneumatic circuit
Additional installation instructions.
Before installing the air dryer, the following conditions must be met:
The air dryer must have a shut-off pressure and an excess pressure the same as the previously used pressure regulator (or according to calculations).
The previously used pressure regulator must be removed;
Remove or turn off automatic condensate drain valves and antifreeze devices.
The air dryer is installed between the air compressor and the multi-circuit safety valve. Allowable tilt in any direction from 0° to 90°, atmospheric outlet 3 can point down or to the side.
The air dryer must be installed at a sufficient distance from heat-emitting parts of the engine, exhaust system or drive.
Enough space must be provided to allow replacement of the desiccant cartridge.
To secure the air dryer body, three threaded holes M12x1.5 with a depth of 20 are provided.
In rare cases, due to air vibration during the pumping phase, popping noises occur, which can be eliminated by the following measures.
Change the length of the pipeline between the air compressor and the air dryer, taking into account permissible temperature compressed air at the inlet of the air dryer.
Install a damping receiver (from 1 to 1.5 liters) behind the air compressor and in front of the dryer.
Figure 215. Dryer parameter diagram. Designations: 1 - Pressure regulator cut-out pressure (bar); 2 - Total volume of the brake system (liter); 3 - Regeneration receiver 4 liters; 4 - Regeneration receiver 5 liters; 5 - Regeneration receiver 7 liters; 6 - Regeneration receiver 9 liters
Using the condensate drain valve.
To regularly check the effectiveness of the dehumidification, it is necessary to install at least one condensate drain valve in the air receiver behind the air dryer. In brake systems with different pressure levels, the condensate drain valve is installed in the receiver with the maximum pressure.
Service.
If compressed air leaks, the duration of the filling phase increases, which has an adverse effect on the air drying process. Therefore, if an air leak is detected, repairs must be started immediately.
If an air dryer was included in the brake circuit of a used vehicle, the results of the upgrade can only be felt after three weeks of operation, since any moisture in the brake system is mixed with oil and is therefore removed slowly.
The service life of the replacement drying cartridge depends solely on the degree of contamination of the incoming air. In most cases, depending on the amount of oil in the supplied air, it is enough to replace the replacement cartridge after 1-2 years; for Russian conditions, the recommendation is to replace it 2 times a year (summer-winter and winter-summer cycles).
Replacing the dryer cartridge is carried out according to the following scheme.
Clean the surface of the air dryer from dirt.
The air dryer must not be under pressure. This can be achieved by filling the system with compressed air before turning off the pressure regulator or loosening threaded connection on inlet 1.
Unscrew the drying cartridge by turning it counterclockwise (you can use a special key).
Clean the surface of the case with a rag; in no case should dirt get into the cavity of the purified air ( check valve 10).
When replacing, use only a new cartridge.
Lightly lubricate the seals.
Screw in the new drying cartridge by hand (tightening torque approx. 15 Nm).
Removed (used) drying cartridges must be disposed of separately, since the cartridge contains settled oil.
Checking the safety valve.
To check the safety valve (shown in Figure 216), the pressure regulator is turned off by tightening the hollow screw 2 until it stops. At pressure "A" on pressure gauge 1, the dryer outlet valve should open. During the switching interval, the exhaust valve must be tight (check diagram shown in Figure 217).
Figure 216. Safety valve
Checking the check valve.
When the pressure drops to 0 bar on pressure gauge 1, the pressure on pressure gauge 2 should remain the same.
Setting the pressure regulator.
Set the setscrews 1 and 2 to dimensions 43 and 57 mm. respectively.
Fill the receiver to the specified cut-off pressure “B” according to pressure gauge II (for adjustments, see the tables in the dryer data sheet). Tighten screw 2 until it stops, and then unscrew it 1.25 turns. During further adjustment, it is not allowed to tighten this screw by this amount. Turn screw 1 out until the outlet valve opens and lock in this position.
Figure 217. Dryer test diagram
By reducing the pressure in the receiver (pressure gauge II), the switching interval "C" can be determined. If the switching interval is long, then it is necessary to unscrew screw 2 (to the left). If the switching interval is short, screw 2 should be turned (to the right). After tightening the locknuts, the adjustment of the regulator must be checked again and, if necessary, adjusted again.
Checking the regeneration process.
Fill the regeneration cylinder (4 l) to the cut-off pressure “B” on pressure gauge III. When opening the air dryer outlet valve, turn off the compressed air supply. The pressure in the regeneration receiver should drop to 1 bar within "D" seconds.
Checking for leaks.
When air is supplied to terminal 1 with pressure "B", a maximum leakage of 10 cm/min is allowed.
StarKraft company offers a wide range of compressors and additional equipment, provides installation, configuration and maintenance services for operating units. Right now you can buy a compressor, take advantage of the qualified help of our consultants, or call a specialist to carry out commissioning or maintenance. Experienced employees of our company will also tell you how to properly install a dehumidifier on a compressor and what it is needed for.
A moisture separator is an additional piece of equipment whose task is to improve the quality of the air flow at the outlet of the compressor unit. This is achieved simple method- removal of atmospheric moisture from it
Types and types of moisture separators
Before installing a dehumidifier on the compressor, you need to decide on its type and make sure it is compatible with the model of equipment you are using. The necessary information can be found in the technical documentation. More often optional equipment can be installed both before and after the receiver. Be sure to make sure that the power of the dehumidifier will be sufficient to work with the compressor of this model. At the end installation work it is necessary to check the serviceability of each element of the system and the reliability of all connections. How to properly install a moisture separator on a compressor is also described in the equipment instructions.
There are several types of dehumidifiers: 
- Cyclonic;
- Silica gel based;
- Refrigeration type.
Moisture separators cyclone type work according to to the following principle. The air flow from the compressor, getting inside, swirls along the walls of the device. This helps separate moisture from the air. The condensate flows into a special compartment with a system that blocks the possibility of liquid getting back. Such systems provide the possibility of periodically draining accumulated condensate.
Another type of dehumidifier, based on silica gel, works on a different principle. It is based on the ability of this substance to absorb moisture. Before installing a dehumidifier on the compressor, make sure that this type of accessory can be used with this model of installation. To prepare the dehumidifier for operation, silica gel is poured into it. The greatest effect can be achieved when the design of the device assumes that air will pass through it, overcoming the entire layer of silica gel along the way.
Another type of dehumidifier that you can find on the market is based on the operating principle of a refrigerator. The compressed air is passed through a cooling unit, which dries it, freeing it from condensation. This is the most efficient system air purification, but also more expensive in comparison with others described above.
Based on their many years of experience, StarKraft specialists have prepared several general recommendations, how to properly install the dehumidifier. The compressor and additional equipment can be of any model, but there are a number general requirements and rules to follow.
- Connection and installation of equipment must be carried out so that the air entering the system is as low as possible. For example, in winter time, when supplying air from the street, you can achieve a multiple (4-5 times) reduction in its humidity.
- It is necessary to periodically check that the air in the receiver is at maximum pressure.
- When choosing a room for installing a compressor station, you should give preference to the coolest place. Also, the compressor room must have a powerful and reliable ventilation system.
- If we're talking about about the operation of a small mobile compressor, before turning it on (especially in winter period) it is advisable to take the installation outside in order to cool its body as much as possible.
- Where and how to install the dehumidifier on the compressor also matters. It is best to do this in a place where the air flow passes from minimum temperature and at maximum pressure.
- If, despite everything, you cannot reduce the temperature of the receiver, you can resort to a little trick. Connect a small receiver in series to the main station, installing it outdoors. This will help further reduce the temperature of the air that enters the main system.
- Measures for timely maintenance, checking the condition of filters, and replacing failed elements are extremely important.
To achieve maximum effect from the equipment in use and improve the quality of the air flow, entrust the installation of the unit itself and additional elements professionals. StarKraft specialists will carry out all work with a guarantee, short time, high quality and at affordable prices.
Prepared by: Elizaveta Semyonova
Excessive humidity in a home negatively affects a person’s well-being; it also harms furniture, things, laminate flooring and other items. Under these conditions, fungi and mold spread, which have a detrimental effect on the respiratory system and the body’s allergic reaction. This can also provoke cancer and other serious diseases. In order to support permissible level To reduce air humidity in your home and utility rooms, you must have a dehumidifier. The purchased device is quite expensive, but this device can be made with your own hands.
How to make a dehumidifier with your own hands
Air dehumidification devices sold in retail chains differ in functionality, level of efficiency and operational reliability. The main details of such devices:
- fan;
- evaporator;
- container for collecting water;
- capacitor;
- control Panel.
The operating principle of such devices is as follows:
- The fan draws room air into the evaporator.
- A sharp drop in temperature inside the device leads to the fact that the moisture in the air turns into a liquid state and flows into a collection container.
- After filling the moisture container, it will drainage tubes is removed from the device.
- The dried air passes through the radiator and is discharged from the device, preheated at high temperature.
It would seem that to reduce the humidity in a room, it is enough just to increase the air temperature. But this can greatly dry it out, which is just as bad as over-humidified air.
Note! The right device To dry the air, you should not dry it out too much. For control in homemade device You can install the purchased hygrometer. 
What materials and tools will be required
To make an absorption dehumidifier with your own hands, you will need the following tools and items:
- two-liter plastic bottles - 2 pieces;
- knitting needle, needle or nail;
- box of matches or lighter;
- scissors or knife;
- scotch;
- sealant;
- scissors;
- gloves for work;
- substance for absorption;
- fan.
Silica gel is used as an absorption substance. It can be used many times, just dry it after use. At the same time, its properties are not lost. For one device, 200 g of absorbent is enough.
You can use the charger to mobile phone, battery or regular batteries as power for the fan. 
Important points when assembling the device
When choosing the model of dehumidifier to be assembled, you should consider that condensation dryer air not only removes high humidity, but can also reduce the air temperature by about 5 degrees. Therefore, when using it, you should turn on the heater. The installation should be carried out in such a way that the air flows intersect.
Important point! When organizing air dehumidification, you should determine the total humidity of the room so that too much dehumidification does not occur. In a room in which the humidity exceeds the threshold of 70%, dehumidification should be carried out.
A home-made device does not always have beautiful view, therefore it is usually used for premises intended for economic purposes. 
Do-it-yourself dehumidifier for an apartment: step-by-step instructions
There are several options self-made air dryers. The simplest way is to make this device from plastic bottles.
Option 1
You will need 2 plastic bottles (each volume is 2 liters). Holes are made in the bottom of one of the bottles using a nail or knitting needle heated over a fire. Then it is cut crosswise with scissors, approximately in the middle.
Make holes in the top half and screw it on with a lid. Then turn it over and place it inside the bottom half. An absorbent is poured into the upper part (silica gel can be used). About 250 g of this product is enough.
The bottom of the second bottle is cut off and a fan is attached at a height of 10 cm from the edge of the bottom cut. Air stream directed in the opposite direction from the neck. You can use a regular small fan or computer cooler.
Then another bottle with the bottom cut off is inserted into the container with the absorbent. The joints of the parts are covered with tape.
Although this device is a rather simple device, it can help cope with increased importance. Moreover, the costs of its production (time, physical and financial) are very low.
It can be placed in a children's room or bedroom. If you put it on a bottle decorative cover or make decoupage, you can get an original decorative element. 
Option 2
A dehumidifier can be made from a refrigerator. The main condition is that the compressor works. All doors should be removed from it. Plexiglas is cut to the shape of the door. A hole is cut in the middle of it the same size as ventilation grille. At the next stage, a fan is mounted in it so that air flows into inner part refrigerator. This can be done using self-tapping screws. All joints must be sealed with silicone sealant.
Then small holes are drilled in the top of the plexiglass. Instead, you can attach a second fan, just put it in reverse, so that the air is blown out of the refrigerator.
A small container is placed inside the device to collect condensation moisture. To collect condensate, connect the pipe above the compressor to this container using a hose. All connections are sealed hermetically using silicone or regular tape.
Now you can turn on the dehumidifier. The fan and refrigerator are turned on simultaneously. This dehumidifier can reduce indoor humidity by about 10%. The main disadvantage is the large volume of the device.
Basement dehumidifier
To dry the air in the basement, you can make a device from materials sold in the plumbing department of the store. You should purchase a sewer tee with a diameter of 110 cm.
At the bottom of the tee, a plug is screwed in with holes made in it. There should be a threaded plug in the side hole of the inspection cover. A hole the size of the fan is made in it. You should purchase a fan with a capacity of about 95 cubic meters per hour. It is securely installed in the hole made in the plug, and screwed into the tee. 
Then by inner surface sewer tee is installed metal mesh covered with fine fabric mesh. After this, the inside is filled with an adsorbent (silicon gel). This adsorbent is produced in the form of granules, inside of which there are pores. Moisture collects inside the granules. IN finished device holds approximately 1 kg of silicone gel.
The finished cellar device is secured to the wall using a clamp. After installing it, you can connect it to the network. One hour of operation is enough for all the air in the basement to pass through this device.
This amount of product can absorb up to 0.5 kg of moisture from the air, which settles inside the adsorbent in 1 hour of operation. After this, the gel can be dried in microwave oven, turning it on for 10 minutes, and then the product can be reused.
