Chapter 5: Maintenance

5.3.3.2 Standard Cleanout Procedure

1.Turn off power to unit at the main power disconnect switch.

2.Remove the old compressor and install the new compressor.

3.Remove the liquid line drier and install an oversized liquid line filter-drier (one size larger than the normal selection size).

4.Evacuate the system according to standard procedures. Normally, this will include the use of a high-vacuum pump and a low- vacuum micron gauge for measuring the vacuum obtained.

5.Recharge the system.

6.Turn on the power at the main power disconnect switch and start the system.

5.3.3.3 Burn-Out/Acidic Cleanup Procedure

1.These systems should be cleaned using the suction line filter-drier method.

2.Turn off power to the unit at the main power disconnect switch.

3.Remove the burned-out compressor and install the new compressor.

4.Install a suction line filter-drier designed for acid removal.

5.Remove the liquid line drier and install an oversized liquid line filter-drier (one size larger than the normal selection size).

6.Check the expansion valve, sight glass, and other controls to see if cleaning or replacement is required.

7.Evacuate the system according to standard procedures. Normally this will include the use of a high-vacuum pump and a low-vacuum micron gauge for measuring the vacuum obtained.

8.Recharge the system through the access valve on the suction line filter-drier.

9.Turn on power at the main power disconnect switch and start the system.

10.A permanently installed suction line filter-drier permits small-system cleanup to be completed in one service call. The pressure drop across the suction line filter-drier should be measured during the first hour of operation. If the pressure drop becomes excessive, the suction line filter-drier should be replaced (See Sporlan Bulletin 40-10, for the maximum recommended pressure drop [PSI] for the suction line filter drier).

11.In 24 hours, take an oil sample. Observe the color and test for acidity. If the oil is dirty or acidic, replace the suction line filter-drier.

12.In two weeks, examine oil to determine if another suction line filter-drier change is necessary.

5.3.4 Component Replacement

Check all electrical connections to ensure they are tight and properly made. Check all circuit breakers, contactors, and wiring. The contactors should be examined and replaced if contacts are worn or pitted.

1.Turn off power to the unit at the main power disconnect switch.

2.Remove the old component and install the new one.

3.Turn on power at the main power disconnect switch and start the system.

5.3.4.1 Fan Replacement

The EC Fans are located behind the front access panel. The panel must be removed to access the fans. The fans are equipped with quick connect fittings for the power and control cables to make swap-out easy. Lift the retaining latch on top of the power and control cable connector housings to unplug the cables. Cut the wire-ties holding the cable bundle in the cabinet.

Remove the four hex-bolts holding the inlet ring then remove the four hex-bolts holding the fan mounting bracket. Remove the fan assembly together with the inlet ring from the cabinet. Remove the mounting bracket from the old fan and install it on the new fan. Bolt the new fan assembly (together with the inlet ring) into the cabinet and plug the power and control cables into the connectors.

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Black Box CRDX-G-FS-24KW user manual Standard Cleanout Procedure, Burn-Out/Acidic Cleanup Procedure, Component Replacement
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CRDX-W-FS-12KW, Black Box Cold Row DX, CRDX-W-FS-24KW, CRDX-A-FS-24KW, CRDX-A-FS-12KW specifications

The Black Box CRDX series consists of high-performance cooling solutions designed to maintain optimal temperature conditions in data centers and server rooms. Key models in this series include the CRDX-W-FS-12KW, CRDX-W-FS-24KW, CRDX-G-FS-12KW, and CRDX-A-FS-24KW. These units are engineered to provide efficient cooling while addressing the rising demands of modern IT infrastructure.

One of the standout features of the CRDX series is its cold row design. This configuration enables targeted cooling delivery directly to the equipment, enhancing efficiency and reducing energy consumption. The airflow management in these models ensures that cooled air is directed where it is needed most, minimizing hotspots and maximizing cooling performance.

Both the CRDX-W-FS-12KW and CRDX-W-FS-24KW models utilize advanced refrigerant-based cooling technology. These units are equipped with electronically commutated (EC) fans, which are highly efficient and quieter than traditional fan technologies. This innovation not only lowers operational costs but also creates a more comfortable environment within the data center.

The CRDX-G-FS-12KW model stands out for its hybrid capabilities, offering both chilled water and direct expansion cooling options. This versatility allows facility managers to choose the best cooling approach based on their specific requirements and current infrastructure. The hybrid system can optimize energy consumption and enhance cooling efficiency, contributing to lower operating costs.

Another noteworthy feature across these models is their intelligent controls and monitoring capabilities. Equipped with sophisticated sensors and control systems, operators can gain real-time insights into temperature fluctuations, humidity levels, and unit performance. This data aids in proactive maintenance and ensures that cooling systems are operating at peak efficiency.

The CRDX-A-FS-24KW, on the other hand, is designed with a focus on adaptability and scalability. This model can be integrated easily into existing network setups, making it an excellent choice for facilities that anticipate future growth or need to adapt to changing cooling demands.

Overall, the Black Box CRDX series exemplifies the latest advancements in cooling technology, offering innovative features designed to support high-density computing environments. With their efficient cooling capabilities, intelligent controls, and flexible design options, these models provide reliable solutions for data centers looking to enhance their cooling systems while reducing operating costs.
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