Problem 1. The freeze dryer does not operate when the power is turned on. Reason: No voltage at the incoming line or low voltage. Countermeasure: Check the incoming power switch and fuse and eliminate the cause of the failure: High voltage protection switch disconnection countermeasure: Reset reason: loose wiring countermeasure : Check the wiring and tighten the reason: Compressor motor burnout countermeasures: inspection, replacement reasons: AC contactor damage countermeasures: inspection, replacement reasons: refrigeration dryer refrigerant leakage countermeasures: leak detection, make up leakage, add refrigerant. Cause: The automatic air switch is not turned on Countermeasure: Turn on the automatic air switch
Problem 2: The cause of the intermittent operation of the compressor: the low-pressure switch is not operating normally Countermeasure: check whether the control line of the low-pressure switch of the freeze dryer is blocked, check the switch position Cause: insufficient refrigerant Countermeasure: add refrigerant Cause: freeze dryer suction Valve closing or partial closing countermeasures: Opening reason: Hot gas bypass valve clogging countermeasure: Repair reason: Expansion valve or capillary ice clogging countermeasure: Refrigerant replacement problem: Condensing pressure is too high Cause: Water condenser heat dissipation countermeasure: Use dilute hydrochloric acid Cleaning the condenser with a brush Cause: Air in the refrigeration cycle Countermeasure: New vacuum, replacement of refrigerant Cause: Too much refrigerant Countermeasure: Too much refrigerant released Cause: Insufficient cooling water Countermeasure: Increased cooling water Cause: Wind Countermeasure for poor heat dissipation of the condenser: blow the condenser with dry compressed air Reason: the fan switch is set abnormally Countermeasure: adjust the setting value Reason: the ambient temperature is too high Countermeasure: increase the environmental ventilation effect Problem: the condensation pressure is too low Cause: the fan Countermeasure for abnormal switch setting: Reason for adjusting the set value: Countermeasure for excessive opening of the hot gas bypass valve : Adjust the bypass valve counterclockwise Cause: Excessive cooling water countermeasures: Turn off the cooling water
Problem 3: The evaporating pressure of the freeze dryer is too high Reason 2: The opening degree of the expansion valve is too large Countermeasure: Adjust the expansion valve clockwise to reduce the reason 2: The expansion valve temperature package is not close to the outlet wall of the evaporator Countermeasure: Reinstall the temperature Package reason 2: Expansion valve failure countermeasures: replace expansion valve
Question 4: Low evaporating pressure of the freeze dryer and system noise Cause 2: Insufficient refrigerant countermeasures: Reason for adding refrigerant 2: Insufficient gap between compressor piston and valve plate Countermeasure: Replace damaged parts Cause 2: Expansion valve sound countermeasures: Increase refrigerant, replace filter Reason 2: Sound from hot gas bypass valve Countermeasure: This sound is normal and does not affect operation
Question 5: The air pressure drop at the outlet of the freeze dryer is too large Cause: The treatment air volume exceeds the rated value. Countermeasure: The dryer is selected according to the actual treatment air volume. Excessive countermeasures: Reset the piping system Reason: The inlet and outlet valves are not fully opened Countermeasure: Open the inlet and outlet valves Cause: The pipeline is leaking or the filter is blocked Countermeasure: Repair or unblock the pipeline and filter Countermeasure: deal with frost, clear the pipeline 
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