High and low temperature chamber expansion valve failure solution

When the high and low temperature chamber refrigeration system appears when the expansion valve for a long time or less expansion valve is not small, superheat, undercooling is not correct and so on. The reason may be the temperature of the package out of the fault.

1) The temperature of the capillary cracks, so that the charge inside the temperature sensor missing, resulting in the correct signal can not be passed to the thermal expansion valve actuator mechanism.

2) Temperature Wrapped bandaging location is not correct.

Second, temperature package troubleshooting

General temperature package as much as possible installed in the evaporator outlet horizontal section of the return pipe should be far away from the high and low temperature chamber compressor suction port and near the evaporator, but not vertical installation. When the horizontal pipe back to the diameter of less than 7/8 (22mm), the temperature package should be installed in the top of the return pipe, the suction pipe "one o'clock." When the horizontal air return pipe diameter is greater than 7/8, the temperature sensing package should be installed below the air return pipe axis at about 45 degrees with the horizontal axis, ie the "3 o'clock" position of the suction pipe. Because installing the temperature sensing package in the upper part of the suction pipe will reduce the sensitivity of the reaction and may cause excess refrigerant in the evaporator. Installing the temperature sensing package at the bottom of the suction pipe may cause disorder of the liquid supply because there are always a small amount Of the liquid refrigerant flows to the location where the temperature sensing package is installed, resulting in a rapid change in the temperature of the temperature sensing package.

Installation, the temperature package need to use copper wrap, back to the pipe surface to rust, if it is steel, rust painted silver paint surface to ensure that the temperature probe and the back of the trachea good contact. Temperature package must be lower than the valve top membrane cavity, and the temperature of the package head to the level or down, when the relative position higher than the membrane cavity, the high and low temperature chamber capillary should be bent up into a U-shaped, In order to avoid liquid into the membrane cavity.

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