Inverter air conditioner therefore check, Zhang Yunkun, example 1, therefore, the phenomenon of power, lights, flashing, lights, are not bright, the outdoor unit does not work.
Analysis and Maintenance Inverter air conditioners are different from general air conditioners in that they change the frequency through built-in inverters and control DC-DC dual-rotor compressors. During operation, the data measured by the electronic temperature sensor of the inverter system is sent to the 1 module. After an internal analysis and processing, instructions are issued to control the compressor to operate within the 15,150 output speed range. If any part of the compressor module and sensor fails, the outdoor unit does not work.
After inspection, the resistance values of the compressor and the HC module are in the normal range, and the indoor temperature sensor is judged to be bad at 17 ft 5106. Remove the temperature sensor, and the measured resistance at infinity 25 is infinite. Normally, it should be 58k, indicating that it is damaged. After replacing the DTN7KS106E, troubleshoot.
Example 2 Therefore, the phenomenon of self-diagnosis, operation indicator light is always on, but the indicator light does not shine, the outdoor unit does not work.
The analysis and overhaul of the machine's self-diagnosis function is mainly through the three operation indicators are not lit out. According to the fault phenomenon, it is determined that the fault is on the signal line between the indoor and outdoor machines. According to the user's introduction, the machine has just installed and used it will not work failure, estimated that the juice is caused by incorrect installation. Re-inspection, indoor and outdoor signal lines between the machines, found indoor and outdoor inter-machine signal line number and power line ground fault. As a result, the signal is interrupted and the machine is automatically protected. Reconnect the indoor and outdoor connections and the machine will return to normal.
Example 3 Therefore, after the power is turned on, the panel power indicator lights, but the indoor fan does not turn.
The analysis and overhaul will put the indoor unit power supply in the OFF position. After 5 seconds, the buzzer sounds and the panel indicators light up. It is known from the results of the self-test that it is delivered on the indoor fan motor. Check the DC resistance value of each color line of the fan motor and find that the resistance between the red and blue lines is infinite and normal should be 6.18, indicating that the fan motor has been burned out.
Remove the fan motor, install it after repair, put the power switch on, grab the position, remove the diagnostic content, and then put the power switch to the critical position of 0 watts. Observe that the operation indicator light does not respond, indicating that the diagnosis is complete. , Test machine, the machine is operating normally, troubleshooting.
Example 4 Therefore, the phenomenon of electricity boot, the compressor does not turn, the outdoor unit does not, make, analyze and repair the boot self-diagnosis, found that the running lights are flashing, which determine the fault in the frequency conversion data processing circuit module.
The module was removed, and the DC resistance of the terminal was measured. The +end resistance was found to be infinite, indicating that the open circuit was damaged. Because the module could not be purchased, the inverter was replaced by four replacement frequency board and the fault was removed.
Example 5 Therefore, the phenomenon of connecting the power, the light does not shine, the outdoor unit does not work; analysis and repair As the power indicator light is not lit, the initial judgment of the fault in the power circuit, boot power plant host power relay can normally absorb, check apricot Power supply substrate 1 and; 3 pin, found that 3 pin is also particularly =, along the Tuen Road inspection outlet 31 and filter magnetic ring, found that the filter magnetic bad analog to open. After replacing the filter magnetic ring, the fault is corrected, such as the operation of power, the operation of the motor, and the motor of the air conditioner compressor and the fan motor. Except for the use of four motors, the most commonly used is the permanent split capacitor operation. The motor 5. This motor has two windings, namely the starting winding secondary winding and the running winding primary winding. When the motor is running, the starting windings are connected in series with the AC capacitor, so that the starting winding current leads the current of the running winding by 90 electrical angles, that is, the phase separated induced current is generated, so that the motor starts and keeps running.
In the electrical system failure of the air conditioner, the capacitor fault accounts for a certain proportion. Examples are as cold as below. During the inspection, the compressor was started and the indoor fan was blown out of the cold air. After about half a minute, the hot air was blown out, and then the air conditioning was stopped automatically and the overpressure fault code was displayed. Analyze the pressure in the refrigeration system, there are too many refrigerants, there is air in the system, and the outdoor heat exchanger has poor heat dissipation.
After opening the machine, it was found that the blower capacitor had a short circuit. Because of the short circuit of the capacitor, the fan does not turn, so that the external heat exchanger does not dissipate heat, causing the system pressure to be too high. Replace the fan capacitor and troubleshoot.
cold. Test machine, outdoor unit can start, indoor running light refers to normal, but the indoor fan does not send air, after inspection, indoor fan capacitor open circuit, causing the fan does not run. Replace the fan capacitor and the cooling is working properly.
With the clamp-type working current measuring about 20 people, the compressor makes a humming sound and cannot start. Analyze the compressor does not start to make a buzzing noise, such as the voltage is too low, the short circuit of the coil and the shaft of the shaft of the shaft and the capacitor are faulty. Check, the compressor running capacitor serious leakage, replace the same type of capacitor, the compressor starts running, heating is normal.
Single-phase cabinets magic 7 than stomach. Fault phenomenon During the heating operation, the fuse blows 30 people. Maintenance test machine, clamp-type working current measurement, start-up compressor cold start operation, current 12.5 people, hot air. However, it can be seen from the clamp type that the compressor is unresponsive at start-up and only starts in about two seconds. When the set temperature stops, the fuse blows when the compressor heats up after the room temperature drops. Open the external machine inspection, the compressor running capacitor has a slight leakage phenomenon, replace the same type of capacitor, troubleshooting. Analysis of the compressor cold start, the heat engine can not start, because the compressor thermal engine starting torque relative to the cooler is larger, due to capacitance leakage, capacitance drop, reducing the compressor's starting torque, so the cold start Dull, the heat engine cannot start and the fuse blows.
Remarks Capacitor Open Circuit Short Circuit Leakage Fault Measurement Use a universal test 1 to short-circuit the capacitor's two poles with a wire or screwdriver to prevent electric shock.
1 Open circuit breaker does not swing to the right.
The short circuit penetrating pointer does not retract after swinging to the right.
