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In the maintenance of commercial central air conditioning system, temperature inspection and testing is a very important link. This is because the unit components of the entire central air conditioning system have their normal temperature range, and if they exceed this range, they are abnormal. The factors that cause these irregularities may be faults or incorrect adjustments. Therefore, in the maintenance process, it is necessary to analyze the cause of the problem and deal with it or check it in time. The temperature status of several unit components is listed below, and this information will be an important reference for you in the maintenance.
1, compressor exhaust temperature
Normal range: When the compressor is cooling in summer, the exhaust temperature is relatively high and cannot be touched by hand. For example, R22 (refrigerant type > The exhaust temperature of the refrigeration system does not exceed about 125 ° C.
Fault: The exhaust temperature is abnormally high, which may be caused by the high suction temperature or condensation temperature of the compressor, so it needs attention. If the exhaust temperature is too low, you will find that you will not be burned by touching the exhaust pipe, which means that the suction temperature may be very low, which may be caused by too high humidity when the compressor is running or too little cooling dose in the system. In either case, it needs to be resolved in time to avoid more serious failures.
The wet stroke of the compressor is easy to damage the valve structure: the refrigerant runs very little, which will affect the heat dissipation of the motor winding and accelerate the aging of the insulating material.
2, compressor shell temperature
Normal range: A, the upper casing is affected by the inhalation of steam, the temperature is relatively low, in the slightly hot or slightly cool range, estimated at about 30 ° C, there is the possibility of dew on the surface of the local casing around the suction tube.
B. The heat generated by the motor in the lower housing and the friction heat brought out by the frozen oil are mainly brought out of the housing by the steam.
Fault analysis: The surface temperature of the housing rises abnormally, which is caused by the high suction temperature of the refrigeration system. When the hot steam enters the compressor, it will absorb the heat in the housing, and then make the steam temperature rise, further increasing the temperature of the housing surface. When the suction temperature is too low, the casing surface temperature will decrease. Although this situation helps to cool the chilled oil and the motor windings, it will lead to a decrease in cooling capacity.
3, condenser temperature
Normal range: Under normal circumstances, the first half of the heat pipe is very hot, and its temperature has a slow and gradually decreasing trend. The heat sensitivity of the rear part of the heat dissipation pipe is significantly reduced compared with that of the front part.
Fault phenomenon: The refrigerant in the back half of the condenser has gradually liquefied, making the temperature reach the condensing temperature and the subcooling temperature. However, when there is an abnormal situation, there will often be a second half close to normal temperature (ambient temperature). This phenomenon is usually caused by insufficient compressor refrigeration dose. In addition, if the entire condensing tube is hot, it may be caused by too much refrigeration, insufficient ventilation, or too high ambient temperature.
4. Shell and tube water-cooled condenser
Under normal conditions, the upper part is relatively hot and the lower part is lukewarm.
Failure: If the entire housing is not too hot, it may be due to insufficient cooling dose. If the entire shell is very hot, it may be due to insufficient cooling water or poor cooling effect (scale in the water pipe >
5, filter temperature
Normally, the suction tube feels cool and dewy to the touch of your hand.
Fault: If the filter is cold, it may be due to the filter hole is blocked by sludge, so that the filter is not smooth, when the refrigerant flows through the filter, the throttling phenomenon occurs: if the filter is not hot, it is equivalent to the ambient temperature, mostly because the filter is completely blocked and the refrigerant can not flow
6, the temperature of the suction tube
Under normal circumstances, when we touch the suction tube, we feel that it is very cool and dewy. But once there is a failure, the suction tube will become too cool, too much dew and even cause large areas of the machine condensation. This is usually because the refrigerant flow is too large, resulting in the liquid is not fully vaporized in the evaporator, resulting in liquid reflux. On the other hand, if the suction tube is not cool, there is no condensation, and the housing is high, then the problem is usually because the refrigerant flow is too small or the amount of refrigerant is insufficient. This will cause the exhaust temperature to rise and the cooling capacity to fall, which will affect the operation of the entire machine. In order to ensure the best cooling effect, we need to constantly adjust the flow and dosage of refrigerant to ensure the normal operation of the system.
7, thermal expansion valve temperature
Under normal circumstances, the lower part of the expansion valve is cold and dew, and the refrigerant flow sound is dull.
Fault: If the valve body is relatively cold, there is more dew on the surface, or even frost, the flow sound of the refrigerant is larger (gas flow >. Mostly because the filter is blocked, or the refrigerant in the power box leaks, and the valve hole is closed.
8, the temperature of the capillary
Under normal conditions, the capillaries are cool and accompanied by dew, and there is the sound of liquid flow;
Fault: If the surface of the capillary is very cool, dew is also condensation, but the flow sound is louder, mostly for insufficient refrigeration; If the surface of the capillary is not cool, there is no condensation, and the flow sound is not heard, it is mostly blocked by the filter or the capillary field plug
9. Temperature of the evaporator
Under normal circumstances, the outer surface of the evaporator is very cold, the condensation water droplets constantly drip down, the wind temperature is larger, the temperature range is generally 12 ~ 14℃, if the surface of the evaporator is not too cool, there is not much dew, or no dew, the refrigerant flow sound can be heard, and the temperature difference between the inlet and outlet wind is small. Mostly due to insufficient refrigeration dose, or the expansion valve opening degree is small.
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