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High-Temp Sensor
The optional high-temp sensor is a bimetal-operated sensing device with a normally closed switch.
This device will shut down the entire unit when the inlet air temperature exceeds a preset point. It is
connected between Terminals 1 and 2 at Plug P39.
Smoke Detector
The optional smoke detector power supply is located on the base of the upflow units, and at the top of
downflow units. It is constantly sampling return air through a tube. No adjustments are required.
Water Detection Sensor
WARNING
!
Risk of fire or explosion. Can cause injury or death.
Do not use near flammable liquids or for flammable liquid detection.
The optional water detection devices available are a point leak detection sensor and a zone leak
detection kit. Emerson recommends remote monitoring of these devices for timely detection of water
leaks that can cause expensive building and equipment damage if not resolved immediately.
Figure 1
Liebert leak detection units
®
Liebert Liqui-tect
Point
Leak Detection Sensor
The point leak detection sensor provides leak detection at a critical point. A simple two-wire
connection signals the alarms at a Liebert Thermal Management unit or at a monitoring panel. Run
wires to the Liebert unit and connect them to terminals 24 and 51, 55 or 56. Use NEC Class 2, 24V
wiring. The sensor contains a solid state switch that closes when water is detected by the twin sensor
probes. The sensor is hermetically sealed in all thread PVC nipple and is to be mounted where water
problems may occur. The sensor should be located 6-8 feet (2-2.5m) from the environmental control
unit in a wet trap or near a floor drain. It should not be mounted directly under the unit.
Figure 2
Recommended liquid sensor locations
™
Liebert
®
Challenger 3000
LT460 Zone Leak Detection Kit
Liebert
Unit
Recommended
Liebert Liqui-tect point
leak locations
Floor drain
8
Component Operation and Maintenance
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Troubleshooting
