Liebert Liqui-tect 300 User Manual

MONITORING

Liqui-tect® 300

INSTALLATION MANUAL

Point Leak

Detection

Sensor

TABLE OF CONTENTS

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

EXTERIOR DIMENSIONS AND MOUNTING DETAILS. . . . . . . . . . . 1

PLACEMENT ON SUBFLOOR UNDER COOLING SUPPORT

EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

WIRING TO A LIEBERT ENVIRONMENTAL UNIT . . . . . . . . . . . . . 3

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

i

ii

Introduction

Liebert Liqui-tect® Leak Detection Sensors install quickly and work
simply for reliable detection of leaks.

The Liqui-tect 300 Sensor should be placed at critical points on the
floor. Two corrosion-resistant, gold-plated probes sense the presence of
aqueous liquids. When a leak is detected, the Liqui-tect 300 sensor
generates an alarm signal at the Liebert environmental unit.

NOTE: This sensor can provide an alarm signal only to a Liebert envi­ronmental unit; it should be connected only to a Liebert envi-

ronmental unit.

Exterior Dimensions and Mounting Details

TOP VIEW

0.19"

∅

(4.9mm)

(34.9mm)

3.81"

(96.8mm)

(38.1mm)

X4

1.38"

1.50"

4.50"

(114.3mm)

FRONT VIEW

5.00"

(127.0mm)

SIDE VIEW

2.31"

(58.7mm)

2.00"

(50.8mm)

Shipping weight: 2 Ibs (0.9 kg)
Mounting holes: #8 screws

1

Placement on Subfloor Under Cooling Support Equipment

(Other applications such as drip pans and ceiling pipe trays can be
monitored)

To a Liebert
environmental unit

Leak detection
zone (directly
beneath unit)

LT300

As shown above, the Liqui-tect 300 (LT300) may be placed on a sub­floor within the leak detection zone—the area directly beneath the
unit being protected or other areas such as the unit drip pan or ceiling
pipe trays.

The LT300 is a two-wire connection to the Liebert environmental unit.
A separate 24VAC power supply is not required for this sensor.

NOTE: For a downflow unit, the LT300 sensor must be located six feet
in front of the unit.

2

Wiring to a Liebert Environmental Unit

The LT300 has two wires for connection to a Liebert environmental
unit.

Note: This sensor should be connected only to a Liebert envi­ronmental unit.

Figure 1 LT300 to Liebert environmental units

LT300

Orange wire

Brown wire

Himod or Mini-Mate2 (8 ton)

Environmental

unit

24 (24V)

51, 55 or 56

Liebert Mini-Mate2 (1 to 5 ton)LT300

Liebert Deluxe System/3, Challenger,

Environmental

unit

Orange wire

Brown wire

TB1-1 (24V)

TB1-2 or TB1-3

You can wire up to six Liqui-tect 300 sensors to a single alarm point
on a Liebert environmental unit. Sensors should be wired in parallel,
as shown in Figure 2.

Figure 2 Multiple LT300s to Liebert environmental units

LT300

Liebert environmental unit

Orange wire

Brown wire

Orange wire

Brown wire

TB1-1 (24V)

TB1-2 or TB1-3

Note: When multiple sensors are wired in this manner, you must dis­connect the sensors one at a time when an alarm occurs to determine
which sensor is in alarm. The alarm will stop when the sensor causing
the alarm is disconnected.

3

Troubleshooting

Under normal conditions (no leaks), the LT300 probes create an open
in-line switch. When a leak is detected (alarm condition), the switch
closes.

To determine whether the LT300 is working properly, perform the fol­lowing test:

1. Provide one lead of a 24VAC source to the LT300 orange wire. Con­nect one lead of an AC voltmeter to the LT300 brown wire and the
second lead of the AC voltmeter to the second lead of the 24VAC
source.

2. Read the AC voltmeter to check that there is less than 1VAC. (Some
leakage may occur; otherwise, it will be 0 VAC.)

• 0VAC indicates the water-sensing probes create an open switch.

• 24VAC indicates the water-sensing probes create a closed switch.
If there is 24VAC at this point, the sensor is not working properly.

For assistance, contact your Liebert representative or the Liebert
Technical Support/Service Group.

If there is less than 1VAC, continue to Step 3.

3. Connect a jumper between the two sensor probes or place the probes
in water to create an alarm condition (closed switch).

4. Read the AC voltmeter to check that there is 24VAC.
If there is 24VAC, the LT300 sensor is working properly.
If there is less than 1VAC, the sensor is not working properly.

For assistance, contact your Liebert representative or the Liebert
Technical Support/Service Group.

4

Liqui-tect® 300

MONITORING

INSTALLATION MANUAL

The Company Behind the Products

With over a million installations around the globe,
Liebert is the world leader in computer protection
systems. Since its founding in 1965, Liebert has
developed a complete range of support and
protection systems for sensitive electronics:

• Environmental systems—close-control air
conditioning from 1 to 60 tons

• Power conditioning and UPS with power
ranges from 300 VA to more than 1000 kVA

• Integrated systems that provide both
environmental and power protection in a
single, flexible package

• Monitoring and control—from systems of any
size or location, on-site or remote

• Service and support through more than 100
service centers around the world and a 24/7
Customer Response Center

While every precaution has been taken to ensure
the accuracy and completeness of this literature,
Liebert Corporation assumes no responsibility and
disclaims all liability for damages resulting from use
of this information or for any errors or omissions.

© 2002 Liebert Corporation
All rights reserved throughout the world.
Specifications subject to change without notice.

® Liebert and the Liebert logo are registered
trademarks of Liebert Corporation. All names
referred to are trademarks or registered
trademarks of their respective owners.

SL-31047 (10/02) Rev. 0

Technical Support/ Service

Web Site

www.liebert.com

Monitoring

800-222-5877

[e-mail]

Outside the US: 614-841-6755

Outside the US: 614-841-6755

Single-Phase UPS

800-222-5877

[e-mail]

Three-Phase UPS

800-543-2378

[e-mail]

Environmental Systems

Outside the United States

800-543-2778

614-888-0246

Locations

United States

1050 Dearborn Drive

P.O. Box 29186

Columbus, OH 43229

Via Leonardo Da Vinci 8

Zona Industriale Tognana

35028 Piove Di Sacco (PD)

[phone]

Fax: [phone]

23F, Allied Kajima Bldg.

138 Gloucester Road

[phone]

Fax: [phone]

Italy

Asia

Wanchai

Hong Kong