System Performance Microprocessor Controls

7.0SYSTEM PERFORMANCE MICROPROCESSOR CONTROLS

This section describes in detail how the Mini-Mate2 responds to operator inputs and room conditions.

7.1Temperature Control

7.1.1Cooling/Heating Required

The temperature control program for the microprocessor is based on a calculated percentage requirement for cooling/heating.

7.1.2Cooling Operation (Compressorized Direct Expansion and Chilled Water)

Cooling is ACTIVATED when the temperature control calculates a requirement for cooling of 100%. It is DEACTIVATED when the cooling requirement drops below 50%. Hot gas bypass is energized on DX units when a call for cooling occurs unless there is also a call for dehumidification.

Table 22 Cooling and dehumidification load response of hot gas bypass

Situation

Hot Gas Bypass

 

 

Cooling only

ON

 

 

Dehumidification only

OFF

 

 

Cooling with

OFF

Dehumidification

 

7.1.3Heating Operation Electric Heat or Hot Water

The reheat stage is ACTIVATED when the temperature control calculates a requirement of 100%. Conversely, the reheat is DEACTIVATED when the heat requirement is 50% less than the activation point.

SCR Electric Reheat

The SCR (Silicon Controlled Rectifier) controller proportionally controls the stainless steel reheat feature to maintain the selected room temperature. The rapid cycling made possible by the SCR controller provides precise temperature control, while the constant element temperature improves heater life. During operation of the SCR control, THE COMPRESSOR OPERATES CONTINUOUSLY. The heaters are modulated to provide temperature control. The display status will show when the unit is cooling and heating. The control will automatically lock the compressor cooling to “ON” position, except when the temperature falls below the low temperature alarm set point. Cooling will then be disabled until the room temperature reaches the temperature set point.

7.2Humidity Control

7.2.1Dehumidification/Humidification Required

The humidity control is based on a calculated percentage requirement for dehumidification or humidification (i.e., the difference between the return air humidity and the humidity set point). As the return air humidity rises above the humidity set point, the percent dehumidification required increases proportionally from 0 to 100% over a humidity band equal to the humidity sensitivity setting. The converse is true for percent humidification requirement.

7.2.2Dehumidification Operation, Compressorized Direct Expansion (DX) Systems

Dehumidification with the standard configuration is accomplished by operating the compressor without the hot gas bypass active. Dehumidification will be disabled if the heating requirement exceeds 125%. It is re-enabled when the heating requirement reaches 50%.

Liebert® Mini-Mate2™

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Emerson MINI-MATE2 user manual Temperature Control, Humidity Control, System Performance Microprocessor Controls
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MINI-MATE2 specifications

The Emerson MINI-MATE2 is a cutting-edge temperature and pressure monitoring device specifically designed for the needs of the refrigeration and HVAC industries. Known for its reliability and user-friendly interface, this compact unit serves as a key tool for technicians and facility managers looking to optimize system performance while ensuring compliance with safety standards.

One of the main features of the MINI-MATE2 is its advanced digital display, which allows users to easily monitor and interpret temperature and pressure readings in real-time. Its highly responsive sensors ensure accurate data collection, vital for maintaining optimal operating conditions. Moreover, the device supports a wide range of refrigerants, making it versatile for different applications, from walk-in coolers to commercial refrigeration systems.

The MINI-MATE2 utilizes state-of-the-art technology to enhance efficiency and performance. Equipped with Bluetooth connectivity, it allows for wireless communication with mobile devices, enabling technicians to track readings and receive alerts remotely. This feature not only improves convenience but also helps in quick decision-making, ensuring timely interventions when anomalies are detected.

Another significant characteristic is its robust construction. Built to withstand harsh environments, the MINI-MATE2 features a durable casing that protects it from physical impacts and environmental factors. This resilience ensures longevity, making it a cost-effective investment for any facility.

In addition, the MINI-MATE2 is designed with user-friendliness in mind. Its intuitive interface means that even technicians with limited experience can easily navigate its functionalities. Quick setup and straightforward operation allow for rapid adoption and extensive use in a variety of settings.

Finally, the MINI-MATE2 also includes built-in data logging capabilities. Users can record historical data for analysis and reporting purposes, which is essential for performing trend analysis and identifying potential issues before they escalate. By providing a comprehensive overview of system performance, the MINI-MATE2 empowers users to make informed decisions that can lead to improved energy efficiency and reduced operational costs.

Overall, the Emerson MINI-MATE2 is an indispensable tool for modern refrigeration and HVAC applications, combining cutting-edge technology, user-friendly design, and essential features to support efficient system management.
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