Cool Air LBW-420-LEL Manuale utente

Models

LBW-420-LEL (24 VDC powered)

Ammonia Leak Detector

P a g e | 1 Rev. 2.1 7-7-2017

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

[email protected]

832-615-3588

P a g e | 2

Rev. 2.1 7-7-2017

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 4TO 20MARANGE ............................................................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

P a g e | 3

Rev. 2.1 7-7-2017

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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Rev. 2.1 7-7-2017

INTRODUCTION

The Cool Air Incorporated LBW-420-LEL Detector is a state-of-

the-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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Rev. 2.1 7-7-2017

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.

P a g e | 6

Rev. 2.1 7-7-2017

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.

P a g e | 7

Rev. 2.1 7-7-2017

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.

P a g e | 8

Rev. 2.1 7-7-2017

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.

P a g e | 9

Rev. 2.1 7-7-2017

Use the following chart to select the switch position for the desired

function:

To:

Set the Rotary

Selector Switch to:

Display ammonia concentration in percent

Display the firmware revision

Program the ammonia alarm set point

Factory Use

Note: If the rotary selector switch is left in a position other than “0”

for more than 5 minutes, the digital display will begin to display

ammonia concentration. If this happens, return the selector switch

to the “0” position, then set the switch to the desired position. For

example, if you set the rotary selector switch to position “3” to

program the alarm set point, and if, after 5 minutes of inactivity the

display reverts to displaying ammonia concentration, move the

switch to “0”, then back to “3” to continue programming the alarm

set point.

Caution: Before closing the detector enclosure, be sure to

return the rotary selector switch to position “0” to

correctly display ammonia concentration.

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