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4, too low exhaust temperature
The exhaust temperature is too low. The exhaust temperature and high voltage value, the difference between the exhaust temperature and the high voltage value is lower than 10 ° C, and the stop is protected. Possible reasons: The compressor exhaust temperature sensing package is abnormal; in the refrigeration mode, the indoor electrical expansion action is abnormal; in the heating mode, the outdoor electronic expansion valve movement is abnormal; too much system refrigerant.
5, anti -freezing protection TML0 evaporator If it is too dirty or frosty, the air conditioning cannot be exchanged with the hot air outside and causes the inner machine to freeze. The frozen solution protection is for the icing of the compressor in the inner machine The compressor is stopped to protect the compressor.
6, overheating protection
design is well designed and running under prescribed conditions, the internal temperature will not exceed the allowable value, but the electric electricity value will The machine is running at a high or low voltage, or when it runs at a high temperature environment, the internal temperature of the motor More than the allowable value, when starting frequently, the temperature of the ambassador is too high due to the starting current.
7, exhaust temperature protection
Volume temperature, the cooling agent , lubricating oil carbon, gas carbon, gas The damage of the valve will also block the capacity and drying filter . The protection method is mainly to use the temperature controller induction exhaust temperature. When the temperature controller should be placed near the exhaust port, when the exhaust temperature is too high, the temperature controller moves and cuts the circuit.
8, oil temperature protection
l6 to prevent the temperature of lubricating oil too high. The pressure difference between the oil tube is normal, but it may be due to the high oil temperature and the decreased lubrication performance, resulting in the burning part of frictional parts such as bearings Therefore, the oil temperature protection should be controlled.
9, cooling water breaks protection
compressor water sleeve cooling water, which will cause the compressor's exhaust temperature to rise. Install a pair of electric connection points on the water pipe road of the compressor cooling water cover. When the water flows are too much, the electric connection point is guided by the water. The relay sent a signal to make the compressor start or operate normally. If the water flow is interrupted, the relay power connection point is disconnected, and the compressor cannot be started or the accident stops. However, there are often air bubbles in the water flow, which will cause error movements, and the water case will not immediately cause accidents. Therefore, the relay should be delayed, generally delayed to 15-30s.
10, case temperature protection
case temperature will affect the life of the compressor. Excessive case temperature may be due to the insufficient heat exchange capacity of condenser . Therefore The shell is too hot; the inhalation temperature is too high, and the case is prone to overheating. In addition, the electric motor will be overheated.11, current protection
is that one of the important features are increasing the current in the line. At the time of value, the protection device that reflects on the current and the action is moving Called over current protection .
12, anti -freezing protection
anti -freezing protection When the indoor liquid pipe thermistor feedback temperature is too low, the indoor machine is controlled to prevent freezing protection.
13, overheating protection
is well designed and operated under specified conditions. The internal temperature will not exceed more than exceed more than exceeding the prescribed conditions. Allowable value, but when the motor is running under high or too low voltage, or running at a high temperature environment, the internal temperature inside the motor exceeds allowed Value, when starting frequently, the temperature of the ambassador is too high due to the starting current.
14, delayed launch protection
air conditioner running process, the compressor stopped operation due to various reasons. If the compressor is activated at this time, it may be started due to stress problems The current is too large and the air conditioner is burned. Therefore, the current air-conditioner has a delayed startup protection, that is, each compressor is delayed 3-5 minutes after the operation is stopped.15, phase sequence protection
phase -sequential protection is the protection relay that can automatically phase -sequential recognition. (The sequence of the three fire lines is overwhelmed) Pour to the motor reversal and cause an accident or an accident or The device is damaged. Such as: vortex compressor and piston compressor are different. Because the inverter of the three -phase power supply can cause the compressor's inverter, it cannot be inverted. Therefore, it is necessary to install an anti -phase protector to prevent the cold water unit reversal. When installing an anti -phase protector, the compressor can work at the right time. When the opposite phase occurs, it is necessary to change the two lines of the power to a positive phase.
16, inverter protection
inverter protection is to prevent failure due to the high current of the inverter or the temperature of the wing tablet. Control
17, phased unbalanced protection TML0 The unbalanced voltage will lead to three -phase unbalanced current, resulting in a larger temperature rise -setting overload relay. Among the maximum phase of the current, the proportion of temperature increase is about twice the voltage imbalance ratio. Such as 3%voltage imbalance will generate about 18%of temperature rise.
18, voltage protection
is more common in air conditioning systems, which can also achieve deficiency protection . Later, the corresponding emitting diode was lit.
