High Temperature and Low Temperature Simultaneously

Alarm Descriptions

5.1.8High Temperature and Low Temperature (Simultaneously)

If these two alarms are displayed at the same time, the temperature input signal is lost (or the humidity is out of sensor range: 15 to 85% RH). Dashes will be displayed for the temperature reading. The control system will initiate 100% cooling. Check for a disconnected cable or a failed sensor.

5.1.9Humidifier Problem Infrared Humidifiers

This alarm is activated by the high water float switch in the humidifier pan assembly. The high water float switch is normally closed and opens upon alarm condition. Check for drain clog and, if present, clean drain. Check for float switch stuck high; replace the switch as necessary. Check for proper oper- ation of the humidifier water makeup valve.

Steam Generating (Canister) Humidifiers

This alarm is activated by a signal from the humidifier control indicating that the canister needs to be replaced.

5.1.10Loss of Air Flow

A differential air pressure switch is used to indicate loss of air flow in Challenger 3000 units.

Check for blockage of unit air outlet or inlet. Check blower motor fuses and overload reset. Check for broken belts. Make sure blower wheels are tight to shaft. Run diagnostics to see if the fan contactor is working properly.

5.1.11Loss of Power

If the unit has lost power, or the disconnect switch was turned off before the unit ON switch was pressed (to turn the unit Off), this local alarm will occur when power is restored to the unit. A Liebert remote monitoring unit (optional) will immediately indicate loss of power.

5.1.12Low Humidity

If the return air humidity has decreased to the Low Humidity Alarm setpoint, check to make sure that the unit is setup for humidification (check DIP switch). Check for proper setpoints. Does the room have a vapor barrier to seal it from outdoor humidity? Are doors or windows open to outside air? Run diagnostics to make sure the humidifier system is working properly.

5.1.13Low Suction Pressure

A pressure switch monitors the suction pressure at the compressor inlet to monitor whether pressure has dropped below a factory preset point while the compressor is in cooling operation. When pressure drops below a factory preset point, the switch opens. After the positive start kit time delay, and the switch stays open for five minutes, the alarm is activated. The alarm stays active for 90 minutes.

Look for conditions that would cause loss of refrigerant. Check for piping problems such as leaks or crimped lines. Check for inoperative components such as liquid line solenoid valve, low pressure switch, expansion valve, and head pressure control valve. Check for closed service valves in the liquid line or at the condenser or receiver.

5.1.14Low Temperature

If the return air temperature has decreased to the Low Temperature Alarm setpoint, check for proper setpoints. Run diagnostics to make sure all heating components are operating (contactors and reheats). Are reheats drawing the proper current? (See nameplate for amp rating.)

5.1.15Main Fan Overload

An optional tri-block overload is required for this alarm, and may or may not replace internal motor overload, depending on your model. The overload device is located next to the main fan contactor in the line voltage section. The alarm is activated when the overload is tripped.

3000 specifications

The Liebert 3000 is a cutting-edge power protection solution designed to provide reliable and efficient backup power for critical applications. This uninterruptible power supply (UPS) system is engineered to safeguard sensitive electronic equipment from power disturbances, ensuring uninterrupted operations in data centers, telecommunications, and industrial environments.

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The Liebert 3000 employs advanced technologies to enhance its functionality. It incorporates online double-conversion technology, which provides a continuous supply of clean and regulated power. This technology ensures that connected loads receive stable voltage and frequency, shielding them from voltage spikes, sags, and outages. Additionally, the UPS offers features such as automatic battery testing, which helps ensure peak battery performance and reliability.

Another key characteristic of the Liebert 3000 is its modular design, allowing for flexible scalability. This means that organizations can easily expand the capacity of their UPS system as their power needs grow, without the need for extensive system overhauls. The modular architecture also facilitates simplified maintenance and reduces downtime, as individual modules can be serviced without interrupting power to the critical load.

The system is equipped with comprehensive monitoring and management capabilities. The Liebert 3000 provides real-time data on power usage, battery status, and system performance, enabling facility managers to make informed decisions and proactively address potential issues. The integration of remote management tools allows for seamless monitoring from anywhere, providing peace of mind for operators.

Overall, the Liebert 3000 combines high efficiency, advanced technology, and flexible design to deliver a robust power protection solution. Its reliability and performance make it a preferred choice for organizations seeking to protect their critical infrastructure while enhancing operational efficiency and sustainability. As businesses continue to rely on technology for their everyday operations, the Liebert 3000 stands out as a dependable safeguard against the uncertainties of power quality.