OIL FREE AIR COMPRESSOR Manual

1. Introduction

1.1 Working Principle, Performance Characteristics and Uses

The oil-free air compressor operates using a single-phase motor that drives a crankshaft, which in turn drives a piston reciprocally within a cylinder. This process compresses air. The exhaust valve opens and closes automatically. When the compressed air pressure reaches the rated discharge pressure of 0.7MPa, a switch automatically shuts down the compressor by closing a one-way valve into the gas tank. When the pressure drops to a certain level, the switch automatically opens. As the compressor is sealed, noise is reduced during operation.

The series of air compressors are characterized by low noise and fuel consumption, minimal vibration, low power consumption, stable performance, safety, and reliability. They are suitable for various applications including laboratories, tire inflation, pharmaceutical processes, food processing, airbrush painting, chemical analysis, sewing machines, shoe machines, dry cleaners, and as a gas supply for instrumentation, printing machinery, and other equipment requiring small air consumption, electrical, or plumbing maintenance. For applications requiring relatively clean compressed air, it is recommended to use the AW2000 regulator or a filter.

2. Technical Parameters

The following tables detail the technical specifications for various models:

Model Specifications (Set 1)

Model	Rated Voltage (V)	Power (KW)	Exhaust Volume (L/min)	Working pressure (Mpa)	Storage volume (L)	Net weight (KG)
YM550-9L	220	0.55	110	0.8	9	16
YM550-25L	220	0.55	110	0.8	25	20
YM550-30L	220	0.55	110	0.8	30	22
YM550-2-50L	220	0.55×2=1.1	220	0.8	50	40
YM550-4-180L	220	0.55×4=2.2	450	0.8	180	105
YM750-50L	220	0.75	165	0.8	50	29

Model Specifications (Set 2)

Model	Rated Voltage (V)	Power (KW)	Exhaust Volume (L/min)	Working pressure (Mpa)	Storage volume (L)	Net weight (KG)
YM750-3-90L	220	0.75×3-2.2	495	0.8	90	52
YM750-4-180L	220	0.75×4-3	660	0.8	180	110
YM1200-50L	220	1.2	200	0.8	50	30
YM1200-4-230L	220	1.2×4=4.8	900	0.8	230	170
YM1500-60L	220	1.5	1500	0.8	60	50
YM1500-3-180L	220	1.5×3-4.5	850	0.8	180	125
YM1500-4-180L	220	1.5×4=6	1120	0.8	180	175
YM1500-4-230L	220	1.5×4=6	1120	0.8	230	175
Ym1500-5-230L	220	1.5×5=7.5	1200	0.8	230	200

3. Quality Assurance

The quality assurance period is six months from the date of delivery. The company will provide warranty services strictly in accordance with the following terms for manufacturing quality failures:

3.1 Quality Assurance Conditions:

Users must operate and maintain the product normatively according to the "Manual".
The manufacturing number and logo must remain intact without dismantling or forging.
Product failures must not be caused by improper use or factors arising from force majeure.
Users must use parts supplied by the seller during maintenance.
This product is oil-free and uses air as the operating medium.

3.2 Non-Quality Assurance Requirements:

Users are not permitted to change the product's use, structure, or performance.
The company is not responsible for improper use or losses incurred by third parties.

4. Usage Claim

Before operating, replace the oil stuff on the inlet side with the provided silencer.
The air compressor workplace should be dry, clean, and well-ventilated.
The air compressor must not come into contact with water, should not be placed in open-air locations, and cannot be used in flammable, explosive, corrosive, or dusty environments.
The air compressor should be placed on vertical and hard ground.
The supply voltage should be within the range of 190VAC to 230VAC (50Hz), not lower than 190VAC or higher than 10% of the rated voltage. For safety, the air compressor must be grounded.
Avoid touching components like the host or exhaust pipe when they are hot, especially during or after operation, to prevent scalding.
The power cord should have a cross-sectional area of at least 1.5mm² and the cable length should not exceed 30 meters.
The product serves as a gas source for pneumatic tools and equipment and should not be used to exhaust air towards people or animals.
Before connecting to power, ensure the machine is switched off. Press the red switch to turn off the machine; do not pull the plug directly.
Collision and inversion are strictly prohibited. Take measures to prevent the air compressor from falling or moving unexpectedly, which could lead to safety incidents.
To ensure continuous operation, the air compressor may require a cooling fan for the host. The machine should not be run for more than two hours continuously.

5. Maintenance

Special Note: All maintenance procedures must be performed after disconnecting the power and discharging compressed air to prevent potential harm.

Keep the air compressor clean. Maintenance should be performed by professional staff. The machine is prohibited from use on underground sites.
Drain the sewage from the gas tank at least three times a day. The pressure inside the tank should be less than 0.1MPa.
Regularly check the sensitivity of the safety valve. When the pressure inside the gas tank reaches 0.5-0.8MPa, pull the ring on the safety valve. If the safety valve exhausts easily and its stem resets immediately, it is qualified.
Replace the silencer's flutter after 500 hours of operation.
The gas tank pressure test should be conducted annually. If there is serious rust, bumps, or the pressure test fails, the gas tank must be disposed of.
Discharge the air inside the gas tank before moving the air compressor.

6. Marks and Implications

The following symbols indicate important operational information:

⚠️ [Warning to start]
? [Read the Manual]
? [Do not open valve]
▶️ [Power ON]
❌ [Power OFF]

Other implications include: High-temperature Risk, Shut Down Power, Open Power.

7. Troubleshooting

This table outlines common issues, their potential causes, and recommended approaches:

Trouble Phenomenon	Reason	Approach
The machine can not work	1. It is not electrified	1. Check the plug, switch, and fuse.
	2. Fuse broken	2. Replace fuse.
	3. The switch is cut off	3. Press the switch and check.
	4. Overload protector is in state of protection	4. Restart the machine after the motor is cool (waiting for 15 minutes).
	5. The switch is damaged or wire is broken off	5. Connecting with the reliable service center.
There is the sound of electric current, but the machine can not work or run in very slow speed	1. Voltage is too low	1. Check the voltage, no lower than 200V.
	2. Motor is short circuit or open circuit	2. Connecting with the reliable service center.
Fuse and circuit breaker is broken repeatedly. Note: do not make the wire too long.	1. The fuse is not proper, or current overloaded	1. Check and replace with the proper fuse. Please do not connect to the other electrical equipment, and use a separate circuit.
	2. Switch of one-way valve or air pressure is damaged	2. Connecting with the reliable service center.
Overload protector cut off the electricity repeatedly	1. Voltage is too low	1. Check the voltage, no lower than 200V.
Overload protector cut off the electricity repeatedly	2. Ventilation is poor, temperature is high	2. Put the air compressor in a well-ventilated place.
The pressure drops when turning off the compressor	1. Connecting is loose, leakage	1. Check and use seal gasket on the leakage place.
	2. Drainage Valve is open	2. Tightening the drainage valve.
	3. One-way valve is leakage	3. Removing and inspecting the one-way valve.
The gas discharged contains a large number of water	1. There is a lot of water in the gas tank	1. Discharge the water in the gas tank.
The gas discharged contains a large number of water	2. Temperature or humidity is too high	2. Move the air compressor to a low temperature place, or use oil-water separator.
The air compressor keep running	1. The pressure switch is damaged	1. Replace the pressure switch.
	2. There is leakage	2. Check and Solve.
	3. There is dirty on the one-way valve	3. Clean the dirty valve.
The air Compressor is vibrating	1. Fixed bolts loose.	1. Fix the bolts.
The air Compressor is vibrating	2. Rubber gasket is lost or damaged	2. Replace the gasket.
Output pressure lower than normal	1. Drainage Valve is open	1. Tightening the drainage valve.
	2. Inlet air filter is plugging	2. Cleaning or replacing the filter.
	3. Connection of gas is leak	3. Fastening the bolts to connect the gas.
	4. Cylinder head gasket or valve gaslet is damaged.	4. Replace of gasket.
	5. The piston or cylinder is worn out	5. Replace the piston or cylinder.

8. Exploded Drawing and Components

The following is a detailed exploded view diagram of the compressor head and components, illustrating the assembly of the unit. Each part is numbered for easy identification and reference.

Component List:

1. Wind cover (2)
2. Left fan (2)
3. Left case (1)
4. Connection rod (2)
5. Piston leather cup (2)
6. Pressing plate (2)
7. Hexagon socket head cap screws M6X20 (2)
8. Cylinder (2)
9. Cylinder sealing circle (2)
10. Silencer (1)
11. Cylinder head sealing circle (2)
12. Cylinder head (2)
13. Hexagon socket head cap screws M5X50 (12)
14. Connection pipe (2)
15. Connection pipe sealing circle (2)
16. Pan head screws with cross recess M4X6 (2)
17. Limiting stopper (2)
18. Air outlet valve clack (2)
19. Valve plate (2)
20. Air intake valve clack (2)
21. Metal gasket (2)
22. Crankshaft (1)
23. Bearing 600-22 (2)
24. Hexagon socket set screws with flat point M8*10 (2)
25. Right case (1)
26. Lap hoop (4)
27. Hexagon socket head cap screws M5*150 (1)
28. Flat gasket (4)
29. Stator (1)
30. Holding screws (4)
31. Rotor (1)
32. High pressure soft tube (1)
33. Holding screws M6 (4)
34. Shock-relief gasket (1)
35. Metal capacitor (1)
36. Capacitor (1)
37. Wheel axle (2)
38. Wheel (2)
39. Flate gasket (2)
40. Wheel axle holding screws (2)
41. Observing hole (1)
42. O ring for observing hole (2)
43. Drainage valve (1)
44. Air tank (1)
45. Washer holding screws (2)
46. Big foot washer (2)
47. Foot washer holding screw cap (1)
48. Power cable (1)
49. Check valve (1)
50. Magnetic valve (1)
51. Y50 pressure gauge (1)
52. Ball valve (1)
53. Pressure switch (1)
54. Y40 pressure gauge (1)
55. Pressure adjustable oil water separator (1)
56. Safety valve (1)

9. Product Certificate

This product has undergone testing and meets the technical standards review, confirming its qualification in the factory.

MODEL NO.: [Not Specified]

POWER: [Not Specified]

VOLUME FLOW: [Not Specified]

SPEED: [Not Specified]

SAFETY VALVE SENSITIVITY: [Not Specified]

SERIE NO.: [Not Specified]

QC: [Not Specified]

INSPECTION DATE: [Not Specified]

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