First, pay attention to the ambient temperature of the refrigerated dryer should not be lower than 10℃, in order to avoid the compressor lacking oil and burning up when the freezer oil condensation is not replenished in time.
Second, pay attention to whether the inlet temperature of the refrigerated dryer exceeds the rated value; check daily whether the high and low pressure of the refrigerant is normal; check the electronic drain of the freeze dryer daily to avoid blocking and losing the drainage function. In order to prolong the service life of the drain, drain at least once every shift.
Third, pay attention to whether the compressor of the refrigerated dryer is running smoothly and there is no noise; the air bypass valve must be kept in the fully closed position during normal use. When the ambient temperature or water temperature is lower than 1℃, when the freeze dryer stops, unscrew the plug on the end cover of the water condenser and release the cooling water in the water condenser to avoid the cooling water from freezing and damaging the condenser.
4、Check the freeze dryer every month
1、Whether all electrical contacts are loose or not;
2、The high pressure protection switch HP is set to jump off at 2.1MPa. 、
3、The low pressure protection switch HP of the freeze dryer is set to jump off at 0.33MPa.
4、The compressor overload jump off device of the freeze dryer is set at 23A.
5、Wash the water cooler and cooling tower once every two months;
6、Clean the water filter once a month to ensure the water way is smooth, if there is no water filter, a filter should be added at the water inlet pipe.
7、Clean the air-water separator cartridge regularly to avoid the air line pressure drop too much due to the impurity blockage of the air-water separator cartridge.
V. Reasons for failure of freeze dryer and key points for elimination
(a) The pressure drop of the refrigerated dryer is too large The piping system is wrong The piping valve is not fully open, the valve is fully open The pipe diameter is too small, the pipe diameter is increased The piping is too long, too many elbows and joints. The filter in the piping system is blocked, clean the filter or replace the filter element The air-water separator element of the freeze dryer is blocked, clean or replace it; too much air leakage at the piping connection; check the elbow joint The air processing capacity exceeds the rated value More than the rated flow of the freeze dryer, the pressure drop
1、Replace the larger air cooler and increase the pressure naturally.
2、Reduce the air flow
(2), refrigerated dryer evaporator condensate freeze pressure switch or set the wrong change, check the line, correct the switch expansion valve, hot gas bypass valve failure, reset, check whether the pipeline is blocked, change the new. or set the wrong situation in addition to the water dryer bad piping system error air is not through the dryer door, open the dryer import and export valves, close the bypass valve; bypass valve is not fully closed, close the bypass valve dryer is not level, set level automatic drain tilt, set level drain line is higher than the automatic drain drain drain redesign
(c), the air flow is too large heat load is too high, air source redesign
Drainer failure Cleaning or replacement Refrigerant low pressure meter indication abnormal dew point temperature is too low or too high, adjust the pressure switch, water adjustment valve, expansion valve, hot gas bypass valve Ambient temperature or inlet temperature is too low, not much, can let the dryer continue to use Inlet temperature is too high, additional after-cooler to let the inlet air temperature Refrigerant leak, poor refrigeration effect, fill the leak, refill the refrigerant.
(d), all refrigerated dryer can not run power supply can not be normal power supply: fuse blown or jumped off, broken line; power supply has power but can not start normally control switch failure for a new, voltage abnormal, please check the rated voltage indication on the nameplate, tolerance range ± 10% AC contactor or thermal relay failure.
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