button will turn on/off the unit being monitored and the MR1. With DIP switch #2 in the OFF position, pressing the ON/OFF button will turn toggle the on/off operation of the MR1 only.

Setpoint Control

There are two hidden buttons on the MR1 keypad. These buttons are not labeled on the display to prevent untrained personnel from accessing unit settings.

Figure 5. Display Panel

The F/C button will toggle between degrees Fahrenheit and degrees Celsius for the temperature display.

The SET button will put the MR1 in the set mode. The SET icon in the upper left of the LCD will be displayed along with other icons to indicate which setpoint is being viewed or changed. Use the ￿/SCAN and the ￿/HOLD buttons to change the setpoint. The display will change with each key press to indicate the new value of the setpoint. If the value does not change, then the environmental unit is not accepting the new value because it is out of range. The displayed value is always the actual setpoint in the environmental unit. There are 8 setpoints that can be changed. The SET button is pressed to advance to the next setpoint. After all 8 setpoints have been stepped through, the MR1 will go back to the normal display mode. The SILENCE button can be pressed at any time to exit the set mode.

The 8 setpoints are:

 

 

1.

Temperature Setpoint

5.

High Temp Alarm

2.

Temperature Sensitivity

6.

Low Temp Alarm

3.

Humidity Setpoint

7.

High Hum Alarm

4. Humidity Sensitivity

8.

Low Hum Alarm

Note that the temperature sensitivity is in tenths but there is no decimal point on the MR1 display so, for example 1.4 is displayed as 14.

Refer to Table 3 for availability by microprocessor of setpoint control:

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Liebert MR1 user manual Setpoint Control, Display Panel

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.