Replacing a Compressor (Welding)

NetCol5000-A050 In-row Air Cooled Smart Cooling Product User Manual

The BOM codes are 52273786, 52273786-001, 52273788, 52273788-008, 52273788-001, 52273788-002, 52273788-003, 52273788-009, 52274052, 52273539, 52273539-007, 52273539-005, 52273539-008, 52273539-006, 52273541-005, 52273541-009, 52273755-002, 52273755-003, 52273504, 52271197.

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Replacing a Compressor (Welding)

Prerequisites

A compressor needs to be replaced.
A spare compressor of the same model is available and functional.
To replace the compressor, you also need to replace the filter dryer. Refer to 6.7.7 Replacing a Filter Dryer (Welded).
Recommended tools and materials: welding torch, new compressor and filter dryer, refrigerant reclaiming device, R410A refrigerant, refrigerant charging device

Context

Reclaim or dispose of the refrigerant in accordance with local laws and regulations. During the reclaim process, the R410A refrigerant composition may change. Therefore, you are not advised to refill the reclaimed R410A refrigerant to the cooling system.
When replacing a compressor, avoid skin contact with the refrigerant or lubricant to prevent frostbite or burns.
Do not tilt the compressor during replacement to prevent lubricant leakage.
Install a new compressor immediately after you remove the rubber plugs of suction and discharge vents to prevent the moisture intake.

Procedure

Tap Shutdown on the home screen of the display module.

Exercise caution because the device is still energized after it is shut down on the home screen of the display module.
Open the rear door and remove the air filter.
Turn off the active power switch QF1, standby power switch QF2 (you do not need to turn off QF2 for the model with a single power supply), and drive switch QF3.
Reclaim the refrigerant and ensure that the system has no pressure.
1. Connect the refrigerant reclaiming pump to the outdoor unit needle valve and (if a low temperature component is deployed) the needle valve at the outdoor unit liquid pipe port of the low temperature component. When the pressure decreases to the atmospheric pressure and becomes stable, shut down the refrigerant reclaiming pump.
2. Connect the refrigerant reclaiming pump to the low-pressure needle valve of the indoor unit. When the pressure decreases to the atmospheric pressure and becomes stable, shut down the refrigerant reclaiming pump. Ensure that there is no pressure in the system and the refrigerant is completely reclaimed.
Remove the electric heating belt.
Remove the cover of the connection box and disconnect the compressor power cables.
Figure 11-18 Removing the cables from the electric heating belt and the compressor
Remove the compressor.
1. Use a welding torch to separate the welding points for the suction and discharge pipes from the compressor. After the separation, seal the discharge vent immediately.
  Figure 11-19 Remove the compressor
  
  After removal, seal the suction and discharge vents immediately to keep the system clean and prevent moisture from entering the system.
2. Use a 13# socket wrench (or solid wrench) to remove the two M8 screws and pull out the compressor and bracket.
  
  Do not move the compressor by moving its suction and discharge vents.
3. Remove the four nut washers and spring washers that secure the compressor and bracket using a 13# socket wrench (or solid wrench), and remove the compressor.
  Figure 11-20 Removing the compressor bracket
Secure the new compressor to the bracket again using a solid wrench.
Figure 11-21 Installing the compressor bracket
- During welding, use a silver copper welding rod containing 5% silver. Check that the welding joints are in good condition, without poor soldering.
- To avoid burning the internal components, other pipes, thermal insulation foam, power cables, and labels, take protective measures, such as spreading wet cloth, around the welding position.
- Do not use face-down bonding when welding.
- After the installation, check that the input power cables of the compressor are in the same phase sequence as the wiring terminals.
Secure the compressor bracket to the cabinet interior using a 13# socket wrench, as shown by (1) in Figure 11-22.
Figure 11-22 Installing the compressor
Weld the suction and discharge vents with the compressor using a welding torch, as shown by (2) and (3) in Figure 11-22.
Install the electric heating belt, remove the connection box cover, and reinstall the cover after the compressor cables are connected.
Figure 11-23 Connecting cables to the electric heating belt and the compressor

Ensure that the phase sequence of the compressor input cable is consistent with that on the compressor label. Otherwise, the compressor may be damaged.
Perform a leakage test with nitrogen again. Refer to 3.11 Leakage Test with Nitrogen for Refrigerant Pipes.
After checking that the smart cooling product does not leak, vacuumize the smart cooling product and charge refrigerant. Refer to 4.1 Vacuumizing and Precharging Refrigerant.
Check that the phase sequences are correct before starting the system. Then choose Maint > Diagnostic Mode > Enter to check the system pressure and temperature and ensure the refrigerant is charged with an optimal system status. Refer to 4.7 Charging the Remaining Refrigerant. Ensure that the system is running normally without alarms.
Install the air filter and close the rear door.
Choose Maintenance > Performance Maintenance on the home screen of the display module to access the performance maintenance screen, and clear the runtime of the compressor.