Gree inverter cabinet type outdoor air conditioner outdoor unit maintenance
1 Introduction     Â
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Based on the experience of the brains, the experience of rote memorization, although it can quickly solve some kind of failure, but knows it but does not know why. Of course, this will not be bypassed. As a result, the idea is narrow. When the fault phenomenon or the fault location is slightly different, it will be helpless. When encountering a completely different new model, it is impossible to detect... After the necessary conditions for personnel, it is necessary to master the correct detection method: a good method can do more with less, and easily and effectively determine the fault location; the bad method brings time waste, component waste and user objection, but also It is possible to expand the fault and even cause losses to the user.
2 circuit analysis
Gree KFR-50L/H610 inverter air cabinet type air conditioner outdoor unit MCU control circuit shown in Figure 1.
3 Â Repair note
Fault 1: After 5 hours of power on, the display shows fault code E1
Analysis and overhaul: On-site inspection found that the resistance parameter of the PTC thermistor changed. Troubleshoot after replacing the PTC thermistor.
Experience and experience: In the inverter air conditioner, the PTC thermistor limits and protects the power supply voltage and working current of the air conditioner. When there is lightning or some reason causes the voltage to rise, the PTC thermistor It can suppress the surge and protect the air conditioner from damage.
When the ambient temperature is 25 °C, measure the resistance of the PTC thermistor with a multimeter, which is about 30 to 50 Ω.
Fault 2: After moving the machine, the outdoor fan does not work
Analysis and overhaul: According to the user's report, after the unit was moved, the air conditioner was not cooled. The maintenance workers who had not received formal training had replaced the starting capacitor, but the fault remained unresolved. On-site inspection found that the outdoor fan motor winding was broken. After replacing the fan motor, troubleshoot. The replacement method is shown in Figure 2.
An Indoor Access Point is a device for wireless local area networks (WLAN) that provides wireless network coverage and connectivity. It can connect to a wired network and transmit data via a wireless signal, allowing users to connect to the network wirelessly within coverage.
Indoor access points come in a variety of different types and specifications to suit different scenarios and needs. Here are some common types of indoor access points:
1. Single Band Access Point: A single band access point operates in the 2.4GHz band and typically provides a maximum transfer rate of 300Mbps. This type of access point is suitable for small office or home networks because the 2.4GHz band has better penetration and coverage, but a relatively low transfer rate.
2. Dual Band Access Point: The dual band access point supports both 2.4GHz and 5GHz bands, providing higher transmission rates and better performance. The 5GHz band has more interference free channels than the 2.4GHz band, which can provide faster speeds and more stable connections. Dual-frequency access points are suitable for medium sized offices, malls or hotels.
3. Lightweight Access Point: A lightweight access point is a wireless network device that needs to be used with a network controller. Lightweight access points do not have independent management functions themselves, but are centrally managed and configured via a network controller. This type of access point is suitable for large enterprises or organizations to enable centralized management and monitoring of the entire network.
4. Standalone Access Point: A standalone access point is a standalone device that has its own management and configuration functions and does not require additional network controllers. This type of access point is suitable for small businesses or individual users and can provide a simple and easy-to-use wireless networking solution.
5. Scalable Access Point: A scalable access point is a device that can scale on demand, increasing or decreasing the number of access points based on network demand. This type of access point is suitable for places that require flexible scaling, such as large office buildings, schools, or hospitals.
In addition to the types listed above, there are some special purpose indoor access points, such as:
1. Wall-mounted Access Point: A wall-mounted access point can be plugged directly into a Wall power outlet without the need for an additional power cord. This type of access point is suitable for home networks or small offices and can provide easy installation and use.
2. Integrated Antenna Access Point: The antenna of the antenna access point is integrated into the device, and no additional antenna installation is required. This type of access point is suitable for sites that require simple installation and a nice look.
3. Multiple Antenna Access Point: Multiple antenna access points can achieve better signal coverage and performance through multiple antennas. This type of access point is suitable for large venues or high-density user environments, such as conference rooms, stadiums or airports.
To sum up, there are many different types and specifications of indoor access points, which can be selected according to different scenarios and needs. Whether it's a small office, home network or a large enterprise, you can achieve convenient wireless network coverage and connectivity through indoor access points.
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