The core of air source heat pumps is its compressor. Due to various unreasonable uses or reaching the service life, the compressor will also have various failures. In order to better use air source heat pumps, let's discuss the failure of the compressor together.
1. Overload protector burnout
The most common problem of air source heat pumps is that various failures cause the compressor to work under high temperature and high pressure. The compressor current is too large and the temperature is too high. At this time, if there is no overload protector, the accident of compressor burning will often occur. Therefore, in this case, the burning of the overload protector is not a bad thing. So if the compressor does not work, generally check the overload protector first.
Use a multimeter to measure the two plug-in terminals of the overload protector at room temperature. It should be connected. If it is open or has resistance, it means it is damaged. Overload protectors are also very cheap and are sold in refrigeration stores.
2. Capacitor damage
This is also a common failure. The capacitor that provides the deflection torque when the compressor starts may be broken down due to various reasons, resulting in short circuit or open circuit. If the starting capacitor is damaged, the compressor will not start. At this time, if the compressor is powered on, the compressor will make a "buzzing" sound, but it cannot start. The motor starting (resistance) torque is too large, which will cause excessive current and cause the overload protector to operate. This shows that the cause of the fault is likely to be a damaged starting capacitor.
To check whether the capacitor is damaged, you can disconnect one of the capacitor terminals and touch the two ends of the capacitor with the two probes of the multimeter. If the pointer of the multimeter swings briefly and then returns to infinity, it means that the capacitor is not faulty; if the pointer does not move, it means that the capacitor is disconnected inside. If the pointer of the multimeter swings to near zero and cannot return to the starting position, it means that the insulation inside the capacitor has been damaged, resulting in interlayer short circuit leakage. If the capacitor is damaged, it must be replaced. A simpler way is to disconnect one end of the capacitor after the compressor of the air source heat pump is powered on, and the two terminals of the short-circuited capacitor will spark and crackle, indicating that the capacitor has capacity and is intact. If the capacitor is damaged, it should be replaced in time according to the capacity and withstand voltage requirements of the capacitor mark.
3. Compressor stuck
Sometimes the compressor does not start due to poor lubrication, current fluctuations during startup, etc. This does not mean that the compressor is damaged. If the motor windings and starting capacitors are normal, it may indicate that the compressor has a slight shaft and cylinder jam. You can use a mallet to knock and vibrate several times, which may restore the operation of the air source heat pump compressor.
4. Compressor circuit and identification
According to their circuit connection, the compressor can be measured with a multimeter to determine whether the compressor motor is damaged.
5. Compressor damage
In fact, the probability of compressor damage in air source heat pumps is relatively high. If the compressor power supply is normal, the capacitor is normal, and the motor wire connection is normal, and the compressor does not move after knocking, then it can be determined that the compressor is damaged and must be replaced.
The core of air source heat pumps is its compressor. Due to various unreasonable uses or reaching the service life, the compressor will also have various failures. In order to better use air source heat pumps, let's discuss the failure of the compressor together.
1. Overload protector burnout
The most common problem of air source heat pumps is that various failures cause the compressor to work under high temperature and high pressure. The compressor current is too large and the temperature is too high. At this time, if there is no overload protector, the accident of compressor burning will often occur. Therefore, in this case, the burning of the overload protector is not a bad thing. So if the compressor does not work, generally check the overload protector first.
Use a multimeter to measure the two plug-in terminals of the overload protector at room temperature. It should be connected. If it is open or has resistance, it means it is damaged. Overload protectors are also very cheap and are sold in refrigeration stores.
2. Capacitor damage
This is also a common failure. The capacitor that provides the deflection torque when the compressor starts may be broken down due to various reasons, resulting in short circuit or open circuit. If the starting capacitor is damaged, the compressor will not start. At this time, if the compressor is powered on, the compressor will make a "buzzing" sound, but it cannot start. The motor starting (resistance) torque is too large, which will cause excessive current and cause the overload protector to operate. This shows that the cause of the fault is likely to be a damaged starting capacitor.
To check whether the capacitor is damaged, you can disconnect one of the capacitor terminals and touch the two ends of the capacitor with the two probes of the multimeter. If the pointer of the multimeter swings briefly and then returns to infinity, it means that the capacitor is not faulty; if the pointer does not move, it means that the capacitor is disconnected inside. If the pointer of the multimeter swings to near zero and cannot return to the starting position, it means that the insulation inside the capacitor has been damaged, resulting in interlayer short circuit leakage. If the capacitor is damaged, it must be replaced. A simpler way is to disconnect one end of the capacitor after the compressor of the air source heat pump is powered on, and the two terminals of the short-circuited capacitor will spark and crackle, indicating that the capacitor has capacity and is intact. If the capacitor is damaged, it should be replaced in time according to the capacity and withstand voltage requirements of the capacitor mark.
3. Compressor stuck
Sometimes the compressor does not start due to poor lubrication, current fluctuations during startup, etc. This does not mean that the compressor is damaged. If the motor windings and starting capacitors are normal, it may indicate that the compressor has a slight shaft and cylinder jam. You can use a mallet to knock and vibrate several times, which may restore the operation of the air source heat pump compressor.
4. Compressor circuit and identification
According to their circuit connection, the compressor can be measured with a multimeter to determine whether the compressor motor is damaged.
5. Compressor damage
In fact, the probability of compressor damage in air source heat pumps is relatively high. If the compressor power supply is normal, the capacitor is normal, and the motor wire connection is normal, and the compressor does not move after knocking, then it can be determined that the compressor is damaged and must be replaced.
