Vertiv | Liebert PEX+ Chilled Water | User Manual 9
Product Overview
1.5. Optional Components
• Two-stage Electric Heater
The two-stage electrical heater can be selected based on the heating requirement. The electrical heater can
be divided into two stages by configuring the controller. The heater starts step-wise according to the heating
requirement. It not only maintains the room temperature but also reduces the energy consumption.
• Up Flow Plenum
All plenums have grills at the outlet to streamline the airflow movement across the room. The plenum grills can
be manually regulated by changing the direction of airflow as per the site requirement. In the case of customized
design requirement of the Plenum, contact Vertiv local representative.
• Belt Leak Detector
Belt leak detector can provide a signal to the controller to trigger an alarm of air conditioner unit. The controller
performs several dierent conditions according to the setpoints:
1. Water Alarm Shuts Unit Down
2. Water Alarm Shuts Hum Down
• Smoke Detectors
Smoke detection system facilitates the data center to detect smoke in the unique air-flow environment. The
equipment room is outfitted with hot and cold aisles, underfloor and overhead spaces, each separated to contain
airflow within the space. The active smoke detection technique triggers an alarm with the first sign of smoke.
• Fire Detectors
The fire detector can check the field return air temperature. It triggers fire alarm when the smoke level continues
to rise along with elevated room temperature, or the temperature is too high and reaches the fire alarm threshold.
The primary purpose of the sensor is to examine the air temperature and to initialize the anti-fire measures
installed in the facility.
• Supply Air Temperature Sensor
Supply Air Temperature Sensor is used to modulate the heating and cooling eect of the unit by controlling the
supply air temperature through plenum. Temperature limits are field adjustable via display interface. The heating
or cooling warning activates when the temperature exceeds the thresholds.
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