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Replacing a Filter Dryer (Threaded Connection)
Prerequisites
- A filter dryer needs to be replaced.
- A spare filter dryer of the same model is available and functional.
- Tools: refrigerant reclaiming device (configured based on local conditions), Phillips screwdriver, nitrogen cylinder, refrigerant tank, vacuum pump, pressure gauge, rubber hose, protective gloves, two 27# adjustable wrenches, one 36# wrench
- Preparation: Power off the indoor unit, and reclaim the refrigerant in the system.
Context
- Reclaim or dispose of the refrigerant in accordance with local laws and regulations. Do not vent the refrigerant to the atmosphere. 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.
Figure 11-24 shows the position of the filter dryer.
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.
- 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.
- 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 filter dryer, as shown in Figure 11-25.
- Filter dryer replacement requires the collaboration of two persons.
- After removal, immediately seal the pipe opening to keep the system clean, and prevent moisture from entering the system.
- Remove the hold hoop from the filter dryer using a Phillips screwdriver.
- Heat the thread connection position of the adjustable nut using a heat gun for 10 minutes. Secure the filter dryer nut and pipe nut (as shown in Figure 11-24) using two 27# adjustable wrenches respectively. Then loosen the adjustable nut using a 36# adjustable wrench to separate the pipe from the filter dryer.
- Remove the plastic plug from the port of the new filter dryer.
- Install the new filter dryer, as shown in Figure 11-26.
- Secure the filter dryer in the original position. Ensure that the arrow on the filter dryer points upwards.
- Installation of the new filter dryer requires the collaboration of two persons. The torque for tightening the adjustable nut is 70 N·m.
- Apply red glue to the third to second last thread circles of the outer screw thread counting from the pipe outlet inward. Secure the filter dryer nut and pipe nut using two 27# adjustable wrenches respectively. Then tighten the adjustable nut using a 36# adjustable wrench.
- Reinstall the hold hoop.
- 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.
- Power on the device and tap Start on the home screen. Ensure that the smart cooling product is running normally without any alarms.
