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To change the steam water vending machines, the flow of the compressor’s operation is to be controlled
This is the most basic method for replacing a compressor.
1. Remove the power supply
2. Discharge refrigerant
3. Take off the compressor and housing leads
4. When you are working in hot temperatures, take out the suction and exhaust pipes
6. Install the damping pad
7. 7. Install the compressor
8. Welded connection pipe
9. Install nuts and wires to connect them.
10. Leak detection and refrigerant filling
11. Install the housing
2. 2. Work on preparation
1. 1. Unplug the power source
Because the connecting wire at the connecting terminal needs to be removed for the replacement of the compressor, the power supply to the air conditioner should be shut off prior to the replacement. Unplug the power outlet and push down the button to disconnect the circuit breaker.
2. Discharge refrigerant
In the event of replacing the compressor it is essential to utilize a welding torch to join the suction pipe as well as the exhaust pipe orifice. The refrigerant within the system (R22 or R410A) will produce toxic gas when encountering high-temperature open fire which is why the refrigerant inside the system must be vented.
During operation, the loose wrench is employed to loosen the small pipe nut on the outdoor unit, as shown in the figure below; The refrigerant inside the system is released from the nut. After the gas has been discharged for a certain amount of time after which the nut of the pipe’s surface which connects the outdoor unit to the connecting pipe is removed. This will allow the system to exhaust all refrigerant.
3. Remove the housing and compressor leads
1) . By using a cross-screw screwdriver remove the screws that fix the top cover as well as the front cover of the outdoor unit.
2.) 2. At this point you can see that there thermal insulation cotton (felt) on the outside of the compressor. Once you have located the line that is fixed, remove the thermal insulation cotton.
3.) . Because the compressor foot screw is located in the rear side cover, it is recommended that the rear side cover must also be removed. Release the nut that holds the fixed part of the cover for the compressor wiring with an 8mm fixed wrench or pointed nose pliers and then take off the nut and wiring cover and wiring cover in turn.
4.) Take photos with the camera on your phone to note down the lead function of each wire terminal. After you have installed the new compressor, use pointed nose pliers for the removal of the three wire leads. Also, take out the top gasket for the cover of wiring.
3. 3. Remove the compressor
1. Eliminate the exhaust pipe as well as the suction pipe when you are working in hot temperatures.
1.) It is used to contact the valve port in two directions of the outdoor unit. If no gas is seen, it means that the outdoor unit’s refrigerant has been fully released.
2) Heat the exhaust pipe orifice by using the torch for welding. Once the pipe’s pipe orifice has transformed into a bright red and the solder in its welding joint is flowing freely, clamp the copper connecting pipe with pliers. Then lift the pipe upwards and pull it out of the exhaust pipes. 3) use the same method to take out the connecting pipe from the suction pipe for the compressor.
4.) After removing the the suction pipe and exhaust pipe of the compressor, continue to use the welding torch to warm the pipes to ensure that the remaining solid of the solder that is on the surface can completely melt and flow until it falls down creating a smooth surface, so that it can be easily inserted into the pipe orifice of the compressor.
5) After the pipe orifice surface of the connecting pipe is smooth, pull the pipe to disconnect it from the suction pipe’s orifice and exhaust pipe orifices of the compressor in order to prevent re connection due to excessive temperature.
2. Take the compressor off
The compressor is fixed to the outdoor unit base with 3 feet and fixed by three nuts, with an outer diameter of 14mm.
Use a fixed wrench remove the nut that is on the outside, and then remove the 2nd nut within the side cover before removing the 3 nuts (dotted line location), which is located in the middle of the cover. In general, it is required to remove or move the diaphragm in the middle between the compressor and the outdoor fan prior to loosening the nut by using the wrench until it is removed.
The temperature of the pipe orifice as well as the connecting pipe will gradually decrease to normal levels after you’ve removed the three nuts. Check out the outdoor unit, paying attention to the direction and the contents of the compressor’s liquid storage container, in order to identify the best place to install the new compressor.
If you are able to open or move any pipeline that could affect the removal of the compressor, grasp the exterior of the compressor using both hands and raise it up, separating the foot from the base of the outdoor unit and remove the compressor.
4. Install the compressor
1. Install the damping pad.
Remove the 3 rubber pads from the feet of the old compressor and install them correctly on the feet of the new compressor.
2. 2. Stationary compressor
The plastic plugs that seal the suction pipe and exhaust pipe must be removed. of the suction pipe and exhaust pipe from the new compressor, take note of the fixing method used by the previous compressor, grip the shell by two hands, and insert the three feet of the compressor onto the three rods that fix the outdoor unit base.
3. Welding pipeline
The connecting pipe needs to be removed. Next, insert the pipe that is thick into the suction pipe of the compressor. Finally, insert the thin pipe into the pipe’s exhaust orifice. The insertion’s depth should be dependent on the traces left by original pipe. After the pipe is inserted, it is in its natural state and shall not be fixed via external force, else the pipe will be able to move inward after welding the pipe orifice.
The connecting pipes of the compressor exhaust pipe as well as suction tube are joined using a welding torch. While welding, the pipe’s orifice shall be heated to dark red, then the welding rod will be placed in the pipe to seal the pipe orifice.
4. 4. Install the retainer nut
The compressor nozzle temperature at this time is too high to be directly used for leak detection. At this time it is possible for the fixed nut to be used to allow the nozzle temperature to drop naturally, and three foot nuts can be installed on top of it.
The nut doesn’t need to be tightened with a wrench during maintenance. It is used to tighten it gently with a wrench after tightening.
5. Install the connecting cable
It is very important to follow the instructions in putting the cable into place. If the connecting line has been installed incorrectly it will cause the compressor to not start or operate normally. If the compressor of different model is used, measure the resistance of three terminals by using a multimeter resistance block to determine the function of the terminal and then connect three connecting wires.
5. Close work
1. Leak detection
Utilize refrigerant R22 headspace to exhaust the air inside the system. Attach the pipe nut with the thin diameter of the outdoor unit, and make it tight with an abrasive wrench. Then add around 0.7MPa of static refrigerant into the system to identify leaks.
Make use of soapy soap to coat the towel. Knead the foam onto the compressor’s exhaust port and suction ports. Check for bubbles in the welding parts to check for a sand hole. This will help determine whether the leakage of refrigerant normal. If there is bubbles, it’s crucial to remove the refrigerant again and re-weld the joint until the leak has been repaired.
2. Install the cover for the wiring
The wiring cover must be placed above the welding point on the pipe’s exhaust orifice.
3. Install the housing
After the insulation cotton has been put on the compressor’s outside and the front cover is attached, you can attach the along with the rear cover and the upper top cover each in turn. Then, secure all screws, turn on the air conditioner, charge the refrigerant with normal pressure, then replace the compressor.