Cool Air LBW-420-LEL User Manual

Models

LBW-420-LEL (24 VDC powered)

Ammonia Leak Detector

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CAUTION & SYMBOL DEFINITIONS:

CAUTION: Gives detailed description of different

situations to avoid or not avoid for the proper operation of the equipment.

WARNING: RISK OF ELECTRIC SHOCK. DO NOT REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE. REFER TO QUALIFIED SERVICE PERSONNEL. AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS ENLEVER LE COUVERCLE. AUCUN ENTRETIEN DE PIECES INTERIEURES PAR L'USAGER. CONFIER L'ENTRETIEN AU PERSONNEL QUALIFIE.

AUTHORIZED DISTRIBUTOR: GasDetectorsUSA.com Houston, Texas USA sales@GasDetectorsUSA.com 832-615-3588

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TABLE OF CONTENTS

IMPORTANT—READ THIS FIRST ................................................................... 3

CAUTIONS ............................................................................................................. 3

AVOIDING NUISANCE ALARMS ............................................................................. 3

INTRODUCTION .................................................................................................... 4

STANDARD FEATURES ...................................................................................... 4

AVAILABLE OPTIONS ....................................................................................... 5

PARTS DESCRIPTION ........................................................................................ 6

FRONT PANEL DISPLAY ........................................................................................ 6

AMMONIA SENSOR ............................................................................................... 7

FRONT PANEL-MOUNTED CIRCUIT BOARD ......................................................... 7

SERVICE JUMPER (SERVICE MODE) ..................................................................... 8

THE “ENTER”, “UP”, AND “DOWN” PUSHBUTTONS ....................................... 8

ROTARY SELECTOR SWITCH ................................................................................ 8

ENCLOSURE-MOUNTED CIRCUIT BOARD ........................................................... 10

POWER CONNECTIONS ................................................................................. 10

J3 SETTINGS ..................................................................................................... 10

RELAYS ............................................................................................................... 11

RELAY STATUS LEDS ......................................................................................... 12

EXTERNAL CONNECTIONS .................................................................................. 12

4–20 mA Analog Output ............................................................................ 12

4 to 20mA WIRING………………………………13

Wiring Diagram: LBW-420-LEL 3 wire – 24 VDC Power Supply…….13

Wiring Diagram: LBW-420-LEL 4 wire – 24 VDC Power Supply…….14

INSTALLATION AND SETUP .......................................................................... 15

REMOTE ALARM LIGHT AND HORN UNIT ............................................ 17

PROGRAMMING AND OPERATION ............................................................. 18

PROGRAMMING THE AMMONIA ALARM SET POINTS ......................................... 18

RESETTING THE RELAYS .................................................................................... 18

PROGRAMMING THE 4 TO 20MA RANGE ............................................................ 19

SETTING THE SERVICE MODE TIMEOUT ............................................................ 19

TEST AND CALIBRATION ............................................................................... 20

TESTING THE DETECTOR .................................................................................... 20

CALIBRATING THE DETECTOR ........................................................................... 21

TECHNICAL SUPPORT .................................................................................... 22

WARRANTY ........................................................................................................ 23

LBW-420 SPECIFICATIONS

............................................................................. 26

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IMPORTANT—READ THIS FIRST

PLEASE READ AND UNDERSTAND THIS SECTION

BEFORE INSTALLING AND OPERATING THE LBW-

420-LEL DETECTOR

CAUTION:

After applying power, test the detector to ensure it is operating correctly. Be sure the detector has been powered for at least 10 minutes before testing.

Do not store this manual inside the detector, as this might result in damage to components from excessive heat.

ADEQUATELY COVER THE DETECTOR SENSOR DURING WASHDOWN, AND AVOID SPRAYING THE WASHDOWN LIQUID DIRECTLY ONTO THE SENSOR

Avoiding unwanted Alarms or shutdowns

To avoid nuisance alarms, place the detector in service mode before:

 Programming the alarm set point.  Performing maintenance, repairs, testing, or calibration.  Performing refrigeration system maintenance.  Removing the ammonia sensor.

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INTRODUCTION

The Cool Air Incorporated LBW-420-LEL Detector is a state-ofthe-art ammonia leak detector that detects and displays ammonia concentrations of 0 to 9.9%. It comes equipped with a long-life ammonia sensor that has a quick and accurate response to ammonia concentrations.

The Cool Air Incorporated LBW-420-LEL has a fully isolated DC to DC power supply, allowing the LBW-420-LEL to be powered from the same DC supply as the 4-20 mA monitoring circuits without concern for ground isolation.

The LBW-420-LEL requires a DC supply voltage between 18 and 36 volts DC.

The LBW-420-LEL can be configured to supply power to the 4-20 mA circuit(s) or can operate as a fully isolated 4-20 mA sensor.

Refer to 4–20 mA Analog Outputs for more details.

The Cool Air Incorporated LBW-420-LEL can be optionally equipped with an AC to DC converter to allow operating the detector with 100 to 240VAC input.

Once the detector senses ammonia at or above the ALARM set point, the relays will activate and stay activated until a relay rest is

initiated (see “Resetting the Relays”)

STANDARD FEATURES

All LBW-420-LEL’s come with these additional standard features:

 Programmable Alarm set point.  Selectable Service Mode timeout.  Range selectable 4-20 mA analog output signals, for

ammonia

 Normally-open, normally-closed contacts for shutting

down compressors and closing valves.

 A NEMA 4X, UL-listed enclosure.

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AVAILABLE OPTIONS

 A remote alarm light and horn box with a toggle switch to

TEST/NORMAL/SILENCE the alarm.

Contact Cool Air Incorporated technical support for more detailed information, or for purchasing any of these options.

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PARTS DESCRIPTION

Front Panel Display

The front panel display is comprised of a digital display and a series of labeled indicating LED’s. The seven-segment, four-digit display indicates a variety of information, such as ammonia concentration and more, depending on the position of the rotary selector switch. Ammonia concentration is displayed in percent ammonia. The LED’s provide an indication of ammonia concentration and alarm status at a glance.

Alarm indication All Relays will be active when this is on.

Alarm disabled indication. All relays will be deactivated when this LED is on.

Two digit seven segment display. In normal operating mode this will display the ammonia concentration. It will also be use in setting options and calibration.

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Ammonia Sensor

The detector comes with a long-life sensor that has a high sensitivity to ammonia with a quick response at levels above .1%.

Front Panel-Mounted Circuit Board

The front panel-mounted circuit board contains the controls necessary for programming and operating the detector. Each control is described in detail below. When the detector enclosure is open, this circuit board is on the left, attached to the front panel. NOTE: The service switch may be a jumper instead of the switch.

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Service Jumper (Service Mode)

The detector can be set to one of two modes: normal operating mode or service mode. The detector is in normal operating mode when the service jumper is in the “OFF” position. When the service jumper is in the “ON” position, the detector continues to function as usual, however the alarm, pre-alarm, and auxiliary relays are disabled as well as the 4 to 20mA signal is set to 4ma (0%). This allows the detector to be serviced, tested, and calibrated without tripping the alarm relays and setting alarms or causing shutdowns.

When the detector is in the service mode, “Alarms Disabled” LED will be illuminated (service jumper “on”). This is done as a reminder to set the jumper back to “off” when service is done. If the service jumper is not returned to off it will automatically return to an as off state after a selected amount of time. The factory default is 15 minutes.

See “Setting the Service Mode Timeout”

The “ENTER”, “UP”, and “DOWN” Pushbuttons

The “UP” and “DOWN” buttons are used for setting the digital

display to the desired value, and the “ENTER” button is used for

programming a value previously set on the digital display. These buttons are used when programming: the set points, configuring other options, they are also used during calibration of the detector.

Rotary Selector Switch

The rotary selector switch (labeled “MENU SELECT” on the front

panel-mounted circuit board) is used for performing functions such as:

 Setting the information displayed on the front panel  Programming set point  Displaying system information  Calibrating the detector  Resetting the relays

When the detector is in operation, this switch is typically set to position “0” to continuously display ammonia concentration.

+ 19 hidden pages

Cool Air LBW-420-LEL User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual