Official Guide for Air Conditioning Core Accessory Replacement

一. Recognition of Air Conditioning Core Accessories

Before carrying out replacement operations, it is necessary to clarify the functions and positions of the core accessories of the air conditioner to avoid operational errors. The main core accessories include:

• Hand-held controller: An operating component for adjusting air conditioning operating parameters and displaying status;
• Internal fan: A core component that realizes indoor air circulation and delivers cold and hot air to the indoor space;
• Circuit board: Including the main control board, lightning protection board, and driver board, it is the "central system" that controls the operation of various functions of the air conditioner;
• Heater: A key component that provides heat output in the heating mode of the air conditioner;
• Compressor capacitor: An energy storage component that provides initial power for the compressor to start and ensures the normal operation of the compressor;
• External fan: A heat dissipation component that dissipates heat for the outdoor unit and prevents the equipment from shutting down due to overheating;
• Compressor: The core of the air conditioning refrigeration cycle, a key equipment for realizing refrigerant compression and transportation.

二. Standardized Replacement Process

2.1 Replacement of Internal Fan

2.1.1 Required Tools

M7 socket wrench, diagonal pliers

2.1.2 Operation Steps

1. Confirm that the air conditioner is powered off, remove the equipment shell (if there is any obstruction), and expose the internal fan assembly;
2. Use an M7 socket wrench to sequentially unscrew the 4 nuts fixing the internal fan;
3. Use diagonal pliers to cut the cable ties used to fix the fan circuit;
4. Gently pull out the terminal connector connecting the fan to the main circuit, being careful not to damage the connector pins;
5. Remove the old internal fan, place the new internal fan in the original position, and sequentially complete the terminal connector connection, cable tie fixing, and nut tightening;
6. After checking that the installation is correct, power on to test the operation status of the internal fan. After confirming that there is no noise and no abnormal shutdown, install the equipment shell back.

2.2 Replacement of External Fan

2.2.1 Required Tools

Phillips screwdriver

2.2.2 Operation Steps

1. Turn off the main power supply of the air conditioner, ensure that the outdoor unit is completely powered off, and remove the outdoor unit protective net (if any);
2. Locate the external fan fixing structure, and use a Phillips screwdriver to unscrew the 4 Phillips screws fixing the external fan;
3. Pull out the terminal connector between the external fan and the main circuit of the outdoor unit, and record the wiring position of the connector (it is recommended to take a photo for retention);
4. Remove the old external fan, install the new external fan in the original position, align it with the screw holes, and then screw in the screws for preliminary fixing;
5. Connect the terminal connector, and after confirming that the connector is inserted in place, tighten all screws;
6. Power on to test the operation of the external fan. After confirming that the heat dissipation is normal and there is no abnormal vibration, install the protective net back.

2.3 Replacement of Heater

2.3.1 Required Tools

2.3.2 Operation Steps

1. After the air conditioner is powered off, remove the indoor unit shell and find the heater installation position (usually near the evaporator);
2. Use a Phillips screwdriver to unscrew the screws fixing the heater, and be careful not to lose small parts when placing them;
3. Use diagonal pliers to cut the cable ties on the heater circuit and sort out the circuit direction;
4. Handle the red wire: The red wire is connected to the driver board and uses a self-locking terminal. It is necessary to use a screwdriver to gently push open the terminal buckle before pulling out the wire. Forcible pulling is prohibited;
5. Pull out the blue wire connected to the capacitor and record the connection interface between the wire and the capacitor;
6. Remove the old heater, install the new heater, and restore the wiring in the order of "connecting the blue wire first, then the red wire". For the red wire, it is necessary to confirm that the self-locking terminal buckle is reset;
7. Fix the circuit with new cable ties, screw back the fixing screws, power on to test the heating mode. After confirming that the heater heats normally, install the indoor unit shell back.

2.4 Replacement of Compressor Capacitor

2.4.1 Required Tools

2.4.2 Operation Steps

1. Cut off the main power supply of the air conditioner, wait for 10-15 minutes to ensure that the residual electricity of the capacitor is completely released (to avoid electric shock risk);
2. Open the outdoor unit shell and locate the compressor capacitor (usually marked with the model "CBB65" and with 2-3 terminals);
3. Record the capacitor wiring method (it is recommended to take a photo), and follow the principle of "pull out one and connect one", pull out the wires on the old capacitor in sequence to avoid wiring confusion;
4. Hold the old capacitor with your hand and rotate it counterclockwise to remove it from the fixing base (some capacitors are fixed by buckles, so you need to gently break the buckles);
5. Check the parameters of the new capacitor (it must be consistent with the old capacitor, such as "40μF±5% 450VAC"), and screw the new capacitor into the fixing base clockwise (or fasten the buckles);
6. Refer to the recorded wiring method, connect the wires one by one, and ensure that each wire is inserted in place;
7. Install the outdoor unit shell back, power on to test the air conditioning refrigeration mode. After confirming that the compressor starts normally, complete the replacement.

2.5 Replacement of Circuit Board

2.5.1 Required Tools

2.5.2 Operation Steps

1. Power off the air conditioner, remove the equipment shell, and expose the circuit board components (distinguish the main control board, lightning protection board, and driver board, and replace the corresponding board as needed);
2. Use a small Phillips screwdriver to unscrew the screws fixing the circuit board. Pay attention to the screw specifications (different boards may use different types of screws, so it is recommended to store them in categories);
3. Record the positions and interfaces of all wirings on the circuit board (it is essential to take photos or draw a wiring diagram), and pull out the wiring terminals one by one. Pulling out multiple lines at the same time is prohibited;
4. Remove the old circuit board, install the new circuit board in the original direction, align it with the fixing holes, and then screw in the screws (do not tighten them temporarily to facilitate wiring adjustment);
5. Refer to the recorded wiring diagram, connect all terminals one by one, and confirm that each terminal is not loose or misaligned;
6. Tighten the circuit board fixing screws, power on to test various functions of the air conditioner (such as on/off, mode switching, temperature adjustment). After confirming that there is no fault, install the equipment shell back.

2.6 Replacement of Hand-held Controller

2.6.1 Required Tools

2.6.2 Operation Steps

1. Power off the air conditioner and find the hand-held controller installation position (usually on the front or side of the indoor unit);
2. Use a Phillips screwdriver to unscrew the 2 screws fixing the hand-held controller, and gently pull out the old hand-held controller outward;
3. Pull out the connection terminal between the hand-held controller and the main circuit. If the terminal is tight, you can use a screwdriver to gently push open the terminal buckle and then pull it out;
4. Take out the new hand-held controller, connect the circuit terminal, and after confirming that it is inserted in place, push the hand-held controller back into the installation slot;
5. Screw back the fixing screws, power on to test the display and operation functions of the hand-held controller. After confirming that the buttons are sensitive and the display is normal, complete the replacement.

三. Key Points for Safety and Quality Assurance

1. Power-off Operation: The main power supply of the air conditioner must be cut off before replacing all accessories. For capacitor replacement, it is necessary to wait for the residual electricity to be released additionally to avoid electric shock accidents;
2. Accessory Matching: The model and parameters of the new accessory must be completely consistent with the old accessory (such as capacitor capacity, voltage, circuit board model). The use of mismatched accessories is prohibited;
3. Wiring Standardization: Before wiring, it is necessary to record the wiring method. The method of "taking photos + pulling out and inserting one by one" is preferred to avoid reverse connection or missing connection of circuits;
4. Test Verification: After the replacement is completed, it is necessary to power on to test the corresponding functions. Only after confirming that there is no abnormality (such as noise, vibration, functional failure) can the shell be installed back;
5. Tool Use: When using tools such as socket wrenches and screwdrivers, it is necessary to select matching specifications to avoid damaging screws or components; pay attention to hand protection when operating diagonal pliers.