Chapter 1: Introduction

During startup, the fans begin operating in stages with five-second time delays. The middle fan starts first, then the upper fan, then the lower fan. The system controller monitors fan operation. If one or two of the fans fails to operate, the controller alerts the operator with an alarm message and increases the speed of the remaining fan(s) to compensate for the loss of airflow.

Use the system controller to configure the fans for zone temperature control with independently variable fan speeds or with all three fans operating at the same variable speed (See Section 4.4.4).

1.5.7 Temperature/Humidity Sensors

Control and alarm recognition takes place by means of the controller analyzing signal inputs from the sensors to manage the operation of the A/C unit consistent with the setpoints entered in the system controller. The system controller monitors three NTC-type temperature sensors and a 4–20 mA temperature/humidity (T/H) sensor.

The NTC sensors are factory installed in predetermined supply air fan zones inside the cabinet. Each NTC sensor is used by the sys- tem controller to manage the speed of the fan for that zone to meet the supply air setpoint temperature. The return air is moni- tored by a temperature/humidity (T/H) sensor that is typically mounted inside the cabinet. As an option, you can remove the return air T/H sensor from the cabinet and mount it in the hot aisle. View the actual sensor values from the controller user interface display using the Information menu loop.

1.6 Optional Equipment

1.6.1 Remote Mounted Supply Temperature/Humidity Sensor

As an option, a supply T/H sensor may be provided for field installation (see Section 2.6.2). This is to be mounted in the supply (cold aisle) space for monitoring or control purposes. Refer to the electrical drawing supplied with your unit for wiring details specific to your system.

1.6.2 Water Detector

As an option, Black Box offers spot-type or strip-/cable-type water detectors (see Section 2.6.1). Upon sensing a leak, the water detector control circuit will signal the system controller of the alarm condition. The system controller is programmed to shut down the compressor and the fans when a leak is detected.

1.6.3 Smoke Detector

Optionally mounted in the return air side of the cabinet, a photo-electric smoke detector senses the presence of smoke and signals the controller when a smoke alarm condition exists and shuts down the air conditioner.

1.6.4 Firestat

Optionally mounted in the return air side of the cabinet, a fire detector senses high return air temperature and signals the controller when a fire alarm condition exists and shuts down the air conditioner.

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Black Box CRDX-G-FS-12KW, CRDX-W-FS-12KW user manual Temperature/Humidity Sensors, Water Detector, Smoke Detector, Firestat

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.