Chapter 5: Maintenance

Symptom: Water–water/glycol valve fails to open or close.

Probable Causes/Recommendations:

a. Temperature setpoint too high. Adjust to correct temperature setting.

b. No control power to the valve. Valve actuator is wired incorrectly. Check wiring diagram and rewire if required. c. Actuator failed. Replace actuator.

Symptom: Condenser pressure too high (CRDX-A-FS-12KW, CRDX-A-FS-24KW units).

Probable Causes/Recommendations:

a. Non-condensable gas or air in the system. Recover system, evacuate per Section 2.10.2.2, recharge. Replace drier/strainer. b. Condenser air intake is blocked. Remove debris and clean condenser.

c. Overcharge of refrigerant. Reclaim excess refrigerant from system.

d. Condenser fan not operating. Check pressure/temperature operating switches and motor. Replace as needed.

Symptom: Condenser pressure too high (CRDX-W-FS-12KW, CRDX-W-FS-24KW, CRDX-G-FS-12KW, CRDX-G-FS-24KW units). Probable Causes/Recommendations:

a. Flow of water/glycol too low.

1.Check glycol solution level and concentration.

2.Valves not open or partially open. Repair/replace as needed.

3.Air in system—bleed system.

4.Check all strainers and clean if needed.

b.Water/glycol temperature too high. Check flow and operation of drycooler.

c.Control pressure set too high. Adjust controller to obtain correct pressure.

d.Water/glycol solution not mixed prior to adding to system. Remove solution and premix. Refill system.

Symptom: Condenser pressure too low.

Probable Causes/Recommendations:

a. Loss of refrigerant (indicated by bubbles in sight glass). Locate and repair leak. Recharge system. b. Condenser fan controls not set properly. Adjust or repair controls.

c. Control pressure set too low. R410A—Readjust to 440 psig.

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Black Box Black Box Cold Row DX, CRDX-W-FS-12KW, CRDX-A-FS-24KW, CRDX-G-FS-24KW, CRDX-W-FS-24KW, CRDX-G-FS-12KW Maintenance

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.