Cool Air LBW-420-LEL User manual

LBW-420-LEL (24 VDC powered)

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Copyright © 2019 by Cool Air Incorporated. All rights reserved.
Ammonia Leak Detector
TABLE OF CONTENTS
IMPORTANT—READ THIS FIRST .................................................................................. 1
CAUTIONS........................................................................................................................... 2
AVOIDING UNWANTED ALARMS OR SHUTDOWNS ............................................................. 2
INTRODUCTION ................................................................................................................. 3
STANDARD FEATURES..................................................................................................... 3
PARTS DESCRIPTION ....................................................................................................... 3
FRONT PANEL DISPLAY ..................................................................................................... 3
FRONT PANEL-MOUNTED CIRCUIT BOARD...................................................................... 5
SERVICE SWITCH JUMPER (SERVICE MODE) ................................................................... 5
THE “ENTER”, “UP”, AND “DOWN” PUSHBUTTONS..................................................... 6
ROTARY SELECTOR SWITCH ............................................................................................. 6
ENCLOSURE-MOUNTED CIRCUIT BOARD ......................................................................... 7
POWER................................................................................................................................ 7
JUMPER J3.......................................................................................................................... 7
Jumpers.......................................................................................................... 8
RELAYS............................................................................................................................... 8
RELAY STATUS LEDS........................................................................................................ 8
OUTPUT CONTACTS ........................................................................................................... 9
4–20 MAANALOG OUTPUT................................................................................................ 9
4TO 20MAWIRING.......................................................................................................... 9
INSTALLATION AND SETUP ......................................................................................... 12
PROGRAMMING AND OPERATION ............................................................................ 13
PROGRAMMING THE AMMONIA ALARM SET POINT ...................................................... 13
MANUAL RESET OF THE ALARM CONDITION................................................................... 13
SETTING THE SERVICE MODE TIMEOUT......................................................................... 14
PROGRAMING THE 4TO 20MARANGE ............................................................................ 14
TEST AND CALIBRATION.............................................................................................. 15
TESTING THE DETECTOR................................................................................................. 15
TESTING THE DETECTOR................................................................................................. 15
Zero ............................................................................................................. 16
Span ............................................................................................................. 17
TECHNICAL SUPPORT ................................................................................................... 19
WARRANTY ....................................................................................................................... 20
LBW-420 SPECIFICATIONS............................................................................................ 23
IMPORTANT—READ THIS FIRST

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Copyright © 2019 by Cool Air Incorporated. All rights reserved.
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.

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Copyright © 2019 by Cool Air Incorporated. All rights reserved.
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.
STANDARD FEATURES
All LBW-420-LEL’s come with these additional standard features:
•Programmable Alarm set point.
•Selectable Service Mode timeout.
•4-20 mA analog output signals, for ammonia which can
communicate directly with computer systems such as
PLC’s.
•Normally-open, normally-closed contacts for
communicating with common industry alarm systems.
PARTS DESCRIPTION
Front Panel Display

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Copyright © 2019 by Cool Air Incorporated. All rights reserved.
The front panel display is comprised of a digital display and a series
of labeled indicating LED’s. The seven-segment, two-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
LEDs 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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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.
Service Switch 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 the 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”
LBW-420-LEL Control Display board
Service Switch Jumper
Enter push button switch
Program mode (SET1) Jumper
UP push button switch
Down push button switch
Menu rotary switch

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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
When the detector is in operation, this switch is typically set to
position “0” to continuously display ammonia concentration.
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
0
Display ammonia concentration in percent
1
Display the firmware revision
2
Program the ammonia alarm set point
3
Factory Use
4
Factory Use
5
Factory Use
6
Factory Use
7
Factory Use
8
Factory Use
9
Note: If the rotary selector switch is left in a position other than
“0” for more than 5 minutes without pushing an “UP”, “DOWN” or
“ENTER” button, 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.

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Copyright © 2019 by Cool Air Incorporated. All rights reserved.
Caution: Before closing the detector enclosure, be sure to
return the rotary selector switch to position “0” to
correctly display ammonia concentration.
Additional functions are available through the rotary selector switch
when the jumper (labeled “SET1”), located below the rotary
selector switch on the front panel-mounted circuit board, is
installed:
To:
Set the Rotary
Selector Switch to:
Factory Use
0
Factory Use
1
Display the firmware revision
2
Program the ammonia sensor Range
3
Set the Service Mode Time out
4
Factory Use
5
Factory Use
6
Factory Use
7
Calibrate the detector fine adjust
8
Calibrate the detector course adjust
9
Enclosure-Mounted Circuit Board
The Enclosure Mounted Circuit board contains the relays, output
contacts and termination points for connecting to external
equipment. When the detector enclosure is open, this circuit board
is on the rear wall of the enclosure. The enclosure-mounted circuit
board is shown in the following picture and described in detail
below.
Power
Power for the LBW-420-LEL must be a DC voltage between 18 and
30 volts with a current rating of at least 0.5 amps at 24 volts. Power
is connected to terminal block J2.
Jumper J3, Ammonia signal
Jumper J3 (ammonia signal) configures the LBW-420-LEL to use
either an external power supply for the Ammonia 4-20 mA circuit
or to use an on board 30-volt DC supply for the 4-20 mA circuits.
With the jumper in the leftmost position, connecting pins 2 to 3 (as

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Copyright © 2019 by Cool Air Incorporated. All rights reserved.
shown in the picture on the next page) 4-20mA power is supplied by
the on-board supply.
With the jumper in the rightmost position, connecting pins 2 to 1
(opposite of picture) 4-20 mA power must be supplied by an
external supply.
Jumpers J3 must be installed in either position. If the jumper is
removed, the 4-20 mA circuit(s) will not function.
Jumper J4 is not used
Jumper Required
Relays
The detector has three miniature printed circuit board relays: the
alarm, pre-alarm (early warning), and the auxiliary relays. In the
normal operating mode, the relays are energized in a normally-open
state. If a loss of power to the detector occurs, the relays will de-
energize and the alarms, if connected, will sound. When the detector
goes into alarm all three relays de-energize at the same time.
Relay Status LEDs
Each relay has a surface-mounted LED associated with it that
indicates the status of the relay. A relay is energized (a non-alarm
condition) when its LED is lighted (green), and de-energized (an
alarm condition) when the LED is not lighted.