Black Box cold row chilled water(CW) engineering manual, crcw-12

Chapter 8: Product Guide Specifications

ELECTRICAL SYSTEM

The electrical system must conform to National Electrical Code (NEC) requirements. In accordance with NEC Class II requirements, the control circuit must be 24 volts AC wire, and control circuit wiring must not be smaller than 18 AWG. All wiring must be neatly wrapped, or run in conduit, or cable trays, and routed in bundles. Each wire must end with a service loop and be securely fastened by an approved method. Each wire in the unit must be numbered for ease of service tracing.

All electrically actuated components should be easily accessible from the front of the unit without reaching overexposed high-voltage components or rotating parts. Each high-voltage circuit should be individually protected by circuit breakers, or manual motor starters, on all three phases. The blower motor must have thermal and short-circuit protection. Line voltage and 24-volt control circuit wiring must be routed in separate bundles. The electric box must include all the contactors, starters, fuses, circuit breakers, and terminal boards required for operation of the Cold Row unit. It must also allow for full service via front and rear access panels.

AUTOMATIC DUAL POWER TRANSFER SWITCH (OPTIONAL)

Two individual main power input disconnect switches will be provided, one for each incoming power source. If the primary power fails or a phase loss/imbalance occurs, the automatic transfer switch transfers power to the secondary power source. Once the primary power has been restored, the transfer switch automatically shifts the power load back to the primary power. The transfer time from one source to the other is user adjustable to allow staging or sequence restart of load.

In addition to the automatic transfer switch function, the local controller display will indicate which power source has failed. This indication is a visual depiction that allows the user to determine the status of the input source. This status can also be conveyed thru the BMS serial communication link.

REMOTE STOP/START CONTACTS

Included in the system’s electrical control circuit must be a 2-pin terminal connection for remote stop/start of the Cold Row CW air conditioner by remote source.

MAIN POWER SERVICE SWITCH

The Cold Row CW must have a unit-mounted main power service switch.

E2 Series Controller Description

GENERAL

The advanced microprocessor based E² Series controller must be equipped with flexible software that meets the specific needs of the application. The setpoints must be default and their ranges must be easily viewed and adjusted from the user interface display. The program and operating parameters must be permanently stored on a non-volatile system in case of power failure.

The controller must be designed to manage temperature and relative humidity (RH) levels to a user-defined setpoint via control output signals to the Cold Row CW unit. Control parameters have variable outputs from 0 to 100% of the full rated capacity.

The controller must receive inputs for measurable control conditions (temperature, relative humidity, and dew point) via return air or room-mounted sensors. The internal logic will then determine if the conditions require cooling, humidification, or dehumidification. Control setpoints must be established to maintain design conditions of the installation. The controller will respond accordingly to changes in these conditions and control the output/demand for the appropriate mode of operation until user-defined conditions are achieved.

FIELD CONFIGURABLE

The program for the E² Series controller must be field configurable, allowing the operator the capability of selecting control setpoints specific to the application. Operator interface for the E² controller is provided via a door-mounted user interface display panel. The display panel must have a backlit LCD graphical display and function keys, giving the user complete control and monitoring capability of the precision cooling system. The menu-driven interface should provide users with the ability to scroll through and enter various menu screens.

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cold row chilled water(CW) engineering manual, crcw24, crcw-12 specifications

The Black Box Cold Row Chilled Water (CW) Engineering Manual focuses on the CRCW-12 and CRCW-24 models, designed for precision cooling in data centers and critical environments. These systems play a vital role in ensuring optimal temperature management, thereby enhancing operational efficiency and equipment longevity.

One of the main features of the CRCW-12 and CRCW-24 units is their high cooling capacity. The CRCW-12 provides a cooling capacity of 12 tons, while the CRCW-24 doubles this capacity with 24 tons. This robust performance makes these units suitable for diverse applications, from small server rooms to large data centers.

Another key characteristic is their modular design, allowing for easy scalability. This flexibility enables users to expand their cooling capabilities as their infrastructure grows, making it an excellent long-term investment. The compact footprint of both models ensures they can fit into tight spaces without sacrificing performance.

In terms of energy efficiency, both CRCW models incorporate advanced technologies such as variable speed fans and compressors. These components adjust their speed according to real-time cooling demand, significantly reducing energy consumption. This smart technology not only lowers operational costs but also contributes to environmental sustainability.

The systems are equipped with state-of-the-art controls that facilitate precise temperature management. These controls enable remote monitoring and management through integrated software platforms, making it easier for facility managers to oversee cooling performance and make necessary adjustments.

Additionally, the CRCW series includes features like dual refrigerant circuits, which increase reliability by allowing the system to maintain operation even if one circuit fails. This redundancy is crucial for mission-critical environments where cooling cannot be compromised.

Noise reduction is another notable characteristic. Both models are designed with sound-dampening technology, making them suitable for environments where low noise levels are essential, such as offices adjacent to data centers.

The use of high-quality materials and components ensures durability and prolonged service life. Regular maintenance is simplified with easily accessible parts, allowing for efficient servicing and lower downtime.

In conclusion, the Black Box CRCW-12 and CRCW-24 cold row chilled water systems are engineered to meet the rigorous demands of modern data centers. Their combination of high cooling capacity, energy efficiency, modular design, and advanced control technologies makes them a preferred choice for reliable and effective temperature management.