What to do if the thermometer bulb is not assembled properly
trouble: the refrigeration effect is low , finding the pressures of both high-pressure side and low-pressure side are high with the use of the branch pipe pressure gauge (when rotation speed of the compressor is 2000r/min, environment temperature is 35℃, low pressure is 2.5kg/cm2, high pressure is 19~20kg/cm2), and the low pressure pipeline is frosting or frost a lot, at this moment the shell of the compressor is cold. When it is serious, the end connection of the gas return will be frosting, and bubble runs in moisture indicator, but the pointer of high pressure gauge doesn’t whipping.
The cause: the thermometer bulb is not wrapped properly. It senses the environment temperature, not the gas-return pipe temperature, which leads to the expansion valve opens too much, the liquid refrigerant is too much in the low pressure pipe line, as a result , the pressure of high/low pressure side is too high, the efficiency of refrigeration is low.
Processing method: 1.check the bulb, assemble it correctly, 2.if the bulb is assembled correctly, the regulating mechanism need to be adjust, if it can not be adjust, the expansion valve should be changed.