Air compressor and cold dryer start-up sequence

The starting sequence of air compressors and cold dryers must be followed“Start the air compressor first, then start the cold drying machine”The principles, specific processes and precautions are as follows:

1. Analysis of standard startup sequence

1. Priority start of air compressor
   As an air source equipment, the air compressor needs to be operated to a stable working pressure (usually takes 5 to 10 minutes) to ensure a continuous and stable supply of compressed air for subsequent equipment. If the cold dryer is started first and the air compressor does not reach the working pressure, the condensation effect of the cold dryer may be reduced due to insufficient air flow.

2. Delayed start of cold dryer
   After the air compressor pressure stabilizes, start the cold drying machine again. At this time, the compressed air has sufficient flow, and the cold drying machine can efficiently remove moisture and avoid the impact of short pressure fluctuations on the cold drying machine.

2. Core inspection items before launch

1. device state check
   • Make sure there is no water/rain in the air compressor, cold dryer and pipes to avoid electrical short circuits.
   • Check the integrity of the power line, and the voltage fluctuation range must be controlled within ±10%.
2. Lubricating oil and bolt confirmation
   • The lubricating oil level of the air compressor needs to be at the center line of the oil window, and it needs to be replenished if it is insufficient.
   • All connecting bolts must be tightened to prevent loosening during operation.
3. Cooling system preparation
   • Water-cooled cooling dryers need to start the cooling water circulation in advance to ensure that the inlet water pressure is ≥0.25MPa and the water temperature is ≤35℃.

3. Key operations during the start-up process

1. Air compressor start-up process
   • Turn on the main air switch → press the reset button to eliminate the alarm → start the air compressor → observe whether the pressure of the air storage tank gradually increases.
   • No-load test is required for the first start-up: press the start key for 5 seconds and then press the emergency stop, repeat 2 times to test the lubrication system.
2. Start-up specifications for chillers
   • After confirming that the air compressor pressure is ≥0.4MPa, start the chiller.
   • Observe refrigerant pressure gauge: high pressure should be 1.2~2.3MPa, low pressure should be 0.4~0.7MPa.
   • Check whether the drainage device is working normally within 30 minutes after starting.

4. Exception handling and safety specifications

• pressure anomaly: If the pressure rises slowly after the air compressor is started, check whether the air inlet is blocked or whether the filter needs to be replaced.
• temperature monitoring: The exhaust temperature of the cold dryer should be ≤ the ambient temperature +15℃. Too high may indicate that the condenser is blocked.
• Frequent starts and stops are strictly prohibited: The interval between two start-ups of the cold dryer should be more than 3 minutes to avoid overheating of the compressor motor.

5. Suggestions for optimization of typical scenarios

• high humidity environment: In rainy seasons or coastal areas, condensate water needs to be manually drained before starting to prevent freezing and damage to equipment.
• Start after a long shutdown: If the shutdown exceeds 24 hours, you need to manually crank the air compressor belt, and then jog the test twice.

summary: Following the starting sequence of “air compressor → cold dryer” and combined with strict pre-sales inspection and parameter monitoring can ensure efficient and stable operation of the compressed air system and extend equipment life. In actual operation, you need to refer to the equipment manual, and if necessary, contact the supplier for personalized guidance.