Section 4: OPERATION

LCD and Keypad

When power is first applied, the MR1 performs self- initialization and then enters the normal display mode. The display alternates between showing the temperature and humidity readings, and cooling/heating, de/humidification, and econocycle operating status.

Pressing the HOLD button will lock on the temperature or humidity reading, continuously updating it two times per second. It will continue to display the same parameter until the SCAN button is pressed or a new alarm occurs.

Figure 4. LCD Display

When you press the SCAN button, the MR1 first scans through the active alarms if any exist, then scans through the heating, cooling, de/humidification, and econocycle/capacity. On chilled water/hot water units, percent capacity indicates the valve position. On units equipped with econocycle, cooling will reflect the valve position. If econocycle is not available, econocycle capacity status is skipped.

While scanning, the HOLD button can be pressed to lock the display on the current item for continuous updating. To return to scanning, press the SCAN button again. After all parameters have been displayed, the monitor returns to the normal alternating status display.

Should a new alarm occur while scanning (or at any other time), the MR1 immediately displays the alarm and annunciates it if the beeper is enabled. The alarm can be silenced by pressing the SILENCE button. On Small Systems Controls, silencing an alarm at the MR1 will also silence the alarm at the unit; on other microprocessors, an alarm that is no longer active can be reset from the MR1 by pressing the SILENCE button.

OFF is displayed when the MR1 has been turned off; OFF flashes if communication between the MR1 and the Environmental unit is disrupted.

With DIP switch #2 in the ON position and monitoring a unit equipped with remote on/off capability, pressing the ON/OFF

Liebert MR1 • 9

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Liebert MR1 user manual Operation, LCD and Keypad
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MR1 specifications

The Liebert MR1 is a state-of-the-art precision cooling unit specifically designed for data centers and critical IT environments. It is engineered to provide optimal temperature and humidity control, ensuring the reliability and longevity of IT equipment. The Liebert MR1 stands out due to its advanced features, technologies, and characteristics, which cater to the growing demands of modern data centers.

One of the main features of the Liebert MR1 is its modular design. This modularity allows for scalable cooling solutions, providing flexibility to adapt to changing needs. The units can be easily combined to create a system that fits the exact requirements of the facility, accommodating both current and future cooling demands.

The Liebert MR1 employs cutting-edge inverter technology, which enhances the efficiency of the cooling process. This technology enables the compressor to adjust its speed, optimizing energy consumption based on real-time cooling requirements. As a result, the unit can significantly reduce operational costs while also contributing to a more sustainable environment.

Furthermore, the Liebert MR1 is equipped with advanced control systems that allow for precise monitoring and management of temperature and humidity levels. Users can easily interface with the unit through an intuitive digital display, enabling seamless adjustments and setting customized environmental parameters. This level of control is crucial for maintaining the ideal conditions conducive to equipment performance.

Another notable characteristic of the Liebert MR1 is its redundancy features. These include built-in redundancies that ensure continuous operation even in the case of a failure in one unit. This reliability is vital for data centers where uptime is of utmost importance, as any downtime can result in significant financial loss and reputational damage.

In addition to its technical features, the Liebert MR1 is designed for near-silent operation. This makes it an excellent choice for environments where noise levels need to be kept to a minimum, such as in office spaces or critical control rooms.

In summary, the Liebert MR1 is an innovative cooling solution that delivers efficiency, reliability, and flexibility for modern data centers. With its modular design, inverter technology, advanced controls, redundancy features, and quiet operation, it addresses the critical cooling requirements of IT professionals, ensuring that their systems remain operational and effective in any condition.
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