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Display cases Thermal expansion valve installation precautions
author: supermarket refrigerated showcase category: commercial refrigeration Views: 526Time: 2016-08-22
display cases Thermal expansion valve installation precautions are as follows:
1, first check whether the expansion valve is in good condition, and pay special attention to whether the display cases thermal power mechanism leaks.
2, the expansion valve should be installed upright and not upside down.
3. The temperature sensing bulb is installed on the air outlet pipe of the evaporator, wrapped tightly on the horizontal pipe section without liquid accumulation, wrapped with heat insulation material, or inserted into the temperature sensing jacket on the suction pipe.
4. When the diameter of the horizontal return pipe is less than 25mm, the temperature sensing bag can be tied to the top of the return pipe; when the diameter of the horizontal return pipe is greater than 25mm, the temperature sensing bag can be tied to the bottom 45 of the return pipe to prevent oil accumulation at the bottom of the pipe Factors such as influence the correct temperature sensing of the temperature sensor.
5. The balance pipe of the external balance expansion valve is generally installed on the return air pipe 100mm behind the temperature sensing bulb, and should be led out from the pipe top to prevent lubricating oil from entering the display cases valve.
6. When there are multiple expansion valves in a system, the outer balance pipe should be connected to the outlet of each evaporator. The shortcomings of the thermal expansion valve lie in the long delay time in response to the degree of superheat, especially the volume delay; the adjustment range is limited; and the adjustment accuracy is low. In order to overcome the above shortcomings, the thermal expansion valve in the refrigeration system can be replaced by an electronic expansion valve.
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