Replacing a Compressor (Threaded Connection)

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 (Threaded Connection)

Prerequisites

A compressor needs to be replaced.
A spare compressor of the same model is available and functional.
The compressor must be replaced with the dry filter. Refer to 6.7.6 Replacing a Filter Dryer (Threaded Connection).
Recommended materials: Phillips screwdriver, two 45# adjustable wrenches, 45# and 50# torque wrenches, 13# and 30# solid wrenches or socket wrenches, new compressor, dryer filter, refrigerant reclaiming device, refrigerant charging device, R410A refrigerant

Context

Components and working principle: The scroll compressor is composed of the suction and discharge angle valves, oil pump, motor, and electric heating belt. Gas is sucked from the outside and exhausted from the position in the center. A variable-frequency scroll compressor uses a frequency converter, and generates different gas volumes as the frequency changes, thereby increasing or reducing the cooling and heating capacity. When the compressor operates at a high speed, it generates a large heating or cooling capacity, which enables the room temperature to quickly reach the preset temperature. When the room temperature decreases to a value close to the preset temperature, the compressor frequency automatically decreases to a certain level to meet the heating or cooling capacity requirements and maintain the room temperature at a stable level.

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.

Figure 11-11 shows an angle valve.

Figure 11-11 Angle valve

(1) Angle valve nut

(2) Adjustable nut

(3) Pipe nut

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 11-12 Removing the electric heating belt and compressor power cables
Remove the compressor.
1. Heat the suction angle valve thread connection position using a heat gun for 10 minutes. Secure the angle nut and pipe nut on the suction side, as shown by (1) in Figure 11-13, using two 30# adjustable wrenches respectively. Then loosen the adjustable nut using a 36# adjustable wrench to separate the pipe from the angle valve. After removing the valve, seal the suction vent immediately.
  Figure 11-13 Removing a compressor angle valve
  
  After removal, seal the suction vent immediately to keep the system clean and prevent moisture from entering the system.
2. Heat the discharge angle valve thread connection position using a heat gun for 10 minutes. Secure the angle nut and pipe nut on the discharge side, as shown by (2) in Figure 11-13, using two 30# adjustable wrenches respectively. Then loosen the adjustable nut using a 30# adjustable wrench to separate the pipe from the angle valve. After removal, seal the discharge vent immediately.
3. Remove the two M8 screws below the compressor bracket, as shown by (3) in Figure 11-13, using a 13# socket wrench (or solid wrench), and pull out the compressor and bracket.
  
  Do not move the compressor by moving its suction and discharge vents.
4. 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 11-14 Removing a compressor bracket
Secure the new compressor to the bracket again using a solid wrench.
Figure 11-15 Installing a compressor bracket
- Seal the screw thread joints in the pipe using sealant.
- 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 11-16.
Figure 11-16 Installing a compressor angle valve
Apply red glue from the second to the fourth circles of the inner screw thread of the suction and discharge angle valves. Secure the angle valve nuts and pipe nuts, as shown by (2) and (3) in Figure 11-16, using two adjustable wrenches, and tighten the adjustable nuts using a torque wrench.

Tighten the suction angle valve to a torque of 180 N·m and tighten the discharge angle valve to a torque of 120 N·m.
Install the electric heating belt, remove the connection box cover, and reinstall the cover after the compressor cables are connected.
Figure 11-17 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.