Chapter 2: Installation

Table 2-10. Weight of R410A refrigerant (lbs./100 ft. of type L tubing).

Line Size O.D.

R410A Charge (less receiver)

R410A Charge (with receiver)

 

 

 

1⁄2

5.88

1.27

 

 

 

5⁄8

9.44

2.03

7⁄8

19.52

4.22

11⁄8

33.44

7.20

13⁄8

50.95

10.97

 

 

 

15⁄8

72.11

15.53

21⁄8

158.29

34.09

Example: Estimate the amount of refrigerant required for a refrigeration circuit in a system using R410A refrigerant consisting of a CRDX-A-FS-12KW unit connected with a 1⁄2" x 30 foot liquid line and 7⁄8" x 30 foot discharge line to a BB-060-SEC or BB-060-SSA condenser.

A/C Unit = 3.9 lb.

+1⁄2" Liquid Line- 30 x 5.88/100 = 1.764 lb.

+7⁄8" Discharge Line- 30 x 4.22/100 = 1.266 lb.

+Condenser = 2.8 lb.

Estimated Refrigerant Charge = 9.73 lb.

(Round off to nearest 0.1 lb = 9.7 lb.)

2.10.2.2 Preparing System For Charging

1.With all the system piping connections made, perform a dry nitrogen leak detection test on the system. Using dry nitrogen only, pressurize the system to 150 psig. Ensure all service and solenoid valves are energized open and that no part of the system is isolated from the pressurized nitrogen.

2.Since there is no refrigerant in the system to detect at this point, leaks may be detected by observing if there’s been a change in the standing pressure after 12 hours. A significant drop in pressure (>10 psig) indicates a leak in the system that needs to be repaired. After the system is determined to be free of leaks, you may evacuate the system.

Evacuate the System

CAUTION

A proper vacuum must be drawn on the refrigerant system to remove moisture prior to charging. If this is not done, the refrigerant charge will combine with moisture in the pipes to form an acid that will eventually lead to compressor failure. A triple evacuation procedure with dry nitrogen is recommended especially for systems with newly installed refrigerant piping.

NOTE: Use a vacuum pump that is capable of evacuating the entire volume of the A/C system, including newly installed or existing piping. It is essential to use a well-maintained pump that is in good operating condition. Always ensure it contains clean, fresh oil. Manufacturers recommend that you change the oil in the pump regularly to maintain its ability to remove moisture.

NOTE: Use high-quality hoses that are free of defects and don’t leak. We recommend using copper tubing instead of hoses if possible because of the low vacuum that must be attained when evacuating the system. Using short, large diameter hoses helps reduce evacuation time.

3.After ensuring there are no leaks, relieve pressure and evacuate the entire system while maintaining all the solenoids open. Pull an initial vacuum of 1500 microns or lower using the suction and discharge service ports.

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Black Box CRDX-W-FS-24KW, CRDX-W-FS-12KW, CRDX-A-FS-24KW, CRDX-G-FS-24KW Preparing System For Charging, Evacuate the System
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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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