Vertiv | Liebert PEX4 | User Manual 10
Product Overview
1.5.3. Upow Plenum
For upow system, the plenum of the same size can be selected with the unit. All plenums have grills to regulate
the airow and can manually control the grills for dierent air directions. The material used for Plenum is hot
galvanized plate with spraying material.
Figure 1-8 Plenum
1.5.4. Long Piping Kit (Air Cooled System)
The long piping kit is mandatory if the eld piping equivalent length is more than 30 m. It is used with both
check valve and solenoid valve. The long piping kit prevents the refrigerant from returning and concentrating
after the compressor is turned o, ensuring the normal start of the compressor and make the system safer.
1.5.5. Smoke Detectors
The smoke detectors immediately shut-down the system and activate the alarm system when activated. The
smoke detectors are mounted in the electrical panel with the sensing element in the return-air compartment.
The smoke detector is not intended to function as or replace any room smoke-detection system that may be
required by local or national codes. The smoke detectors shall include a supervision contact closure.
1.5.6. Fire Detectors
The re detector can check the eld return air temperature. It triggers re alarm when the smoke level
continues to rise along with elevated room temperature, or the temperature is too high and reaches the re
alarm threshold. The primary purpose of the sensor is to examine the air temperature and to initialize the
anti-re measures installed in the facility. Fire detector trips at 125 F±6 F, and when re alarm occurs the unit
will shutdown. Refer Figure 1-9.
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