Which one starts the dryer or the air compressor first?

The starting sequence of dryers and air compressors needs to be flexibly adjusted according to equipment types and usage scenarios. The following are guidelines for comprehensive industry specifications and practical experience:

1. Priority scenarios for freeze dryers (cold dryers)

recommendation order: Cold drying machine → air compressor (interval 3-5 minutes)
applicable: When the system configuration is mainly a freeze dryer (common in the pretreatment process).
principle：

1. The cold drying machine needs to be pre-cooled in advance to the dew point ≤5℃ to ensure effective discharge of condensed water.
2. Starting the air compressor after pre-cooling can prevent high-temperature compressed air from directly entering the dryer and improve dehumidification efficiency.
   operation example：

• Turn on the power supply of the refrigeration dryer, wait until the start indicator light goes out (about 5 minutes), and the compressor runs stably.
• Observe the refrigerant pressure gauge: The low pressure of R22 refrigerant needs to be controlled at 0.3-0.6MPa.
• After confirming that pre-cooling is completed, start the air compressor loading operation.

2. Priority scenarios for adsorption dryer (dry dryer)

recommendation order: Air compressor → dry dryer (start after the pressure reaches 8kg)
applicable: When using an adsorption dryer for deep dehumidification (such as requiring dew point ≤-40℃).
principle：

1. The dryer relies on stable compressed air to drive adsorbent regeneration.
2. The air compressor needs to be run to the rated pressure first to ensure the air flow required for the adsorption process.
   operation example：

• Start the air compressor and open the air intake valve of the dryer after the pressure rises to 8kg.
• Check the drainage condition of the air storage tank to prevent liquid water from entering the adsorption tower.

3. Composite system start-up strategy

If the system is equipped with both a cold dryer and a dry dryer (such as an air compressor station building), it is recommended to operate in the following order:

1. Leng gan machine → 2. air compressor → 3. dryer
   advantages：

• Pretreatment of the cold dryer reduces the air temperature and reduces the load on the air compressor.
• The dryer deeply dehumidifies moisture under stable pressure to ensure the quality of terminal air.

4. Safety specifications and precautions

1. Reverse operation is prohibited：
   • When shutting down, the air compressor should be stopped first, and then the dryer should be turned off to prevent untreated air from backwashing.
2. Low-temperature environment preheating：
   • Starting the cold dryer in winter requires extending preheating to 10 minutes to avoid insufficient lubrication of the compressor.
3. Frequent start and stop restrictions：
   • The interval between two start-ups of the cold dryer needs ≥10 minutes to prevent overheating and damage of the compressor.

5. Special scene adjustments

• laser cutting equipment: The residual moisture in the dryer needs to be evacuated first (blow air for 1-2 minutes after the cold dryer is started).
• high-humidity areas: It is recommended to install a buffer tank after the air compressor to balance the impact of pressure fluctuations on the dryer.

summary: The starting order of the dryer and the air compressor is not absolute. The core principle is to ensure that the drying equipment operates efficiently after the air compressor supplies stable air. It is recommended to refer to the equipment manual and formulate operating specifications based on actual working conditions (such as temperature, humidity, and gas demand).