Cool Air LBW-420-SS User manual

Models
SOLID STATE SENSOR ONLY
LBW-420-SS (115VAC powered)
LBW-420-1-SS (24VDC powered)
LBW-420-2-SS (230VAC powered)
Solid State Sensor

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Rev. 10-4 9-25-2020
Copyright © 2018 by Cool Air Incorporated. All rights reserved.
TABLE OF CONTENTS
LBW-420 SPECIFICATIONS ................................................................. 2
IMPORTANT—READ THIS FIRST ..................................................... 3
CAUTIONS................................................................................................ 3
AVOIDING NUISANCE ALARMS............................................................... 4
INTRODUCTION..................................................................................... 5
STANDARD FEATURES ........................................................................ 5
PARTS DESCRIPTION ........................................................................... 6
FRONT PANEL DISPLAY .......................................................................... 6
AMMONIA SENSOR .................................................................................. 8
FRONT PANEL-MOUNTED CIRCUIT BOARD........................................... 8
SERVICE SWITCH (SERVICE MODE)....................................................... 9
THE “ENTER”, “UP”, AND “DOWN” PUSHBUTTONS ......................... 9
ROTARY SELECTOR SWITCH .................................................................. 9
ENCLOSURE-MOUNTED CIRCUIT BOARD ............................................ 11
POWER (LBW-420) .............................................................................. 12
POWER (LBW-420-1) ........................................................................... 12
JUMPER J3, AMMONIA SIGNAL (LBW-420-1 ONLY)........................... 12
JUMPERS REQUIRED ............................................................................. 13
RELAYS ................................................................................................. 13
RELAY STATUS LEDS........................................................................... 13
EXTERNAL CONNECTIONS .................................................................... 14
4–20 MAANALOG OUTPUT .................................................................. 14
INSTALLATION AND SETUP............................................................. 18
PROGRAMMING AND OPERATION................................................ 19
SETTING THE DESIRED DISPLAY MODE............................................... 20
PROGRAMMING THE AMMONIA HI-ALARM AND LOW ALARM SET
POINTS................................................................................................... 20

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Rev. 10-4 9-25-2020
Copyright © 2018 by Cool Air Incorporated. All rights reserved.
PROGRAMMING THE EXTERNAL TEMPERATURE SENSOR
INSTALLATION STATUS......................................................................... 21
PROGRAMMING THE 4-20 MARANGE .................................................. 22
SETTING THE SERVICE MODE TIMEOUT ............................................. 22
SETTING THE AUXILIARY RELAY PAIRING.......................................... 23
ERROR CODES....................................................................................... 24
MESSAGE CODES .................................................................................. 24
4-20 MAERROR INDICATION ............................................................... 25
AMMONIA LEAK INDICATION............................................................... 25
TEST AND CALIBRATION ................................................................. 26
TESTING THE DETECTOR...................................................................... 26
CALIBRATING THE DETECTOR ............................................................. 27
TECHNICAL SUPPORT ....................................................................... 28
WARRANTY........................................................................................... 29
LBW-420, LBW-420-1 and LBW-420-2
SPECIFICATIONS
Ammonia Detection
Sensitivity 0 to 1000 PPM
High & Low Temperature
Setpoint Range -50°F to 110°F
Display 0.8”, 7-segment LED, 4-digit
Controls
Service mode jumper
Enter, Up, and Down pushbuttons
Rotary selector switch
Jumper
Ammonia Sensor
Metal oxide semiconductor
833 mW integral heater
Alumina ceramic base
100 mesh SUS 316 double gauge flame arrestor
Relays
Alarm, pre-alarm, and auxiliary (see pairing aux relay)
Form C (SPDT), normally-open, normally-closed, energized in normally-open state
Contact rating: 5A, 120 VAC or 24 VDC
Outputs Contacts for: alarm, pre-alarm, and auxiliary relays, and external temperature sensor
4-20 mA DC, conforming to S50.01 ratings, Type 2L and Type 2H
Operating Temperature -50°F to 125°F
Operating Humidity 5% to 95% RH, non-condensing

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Rev. 10-4 9-25-2020
Copyright © 2018 by Cool Air Incorporated. All rights reserved.
Power Requirements
LBW-420 LBW-420 -2
115VAC, 50/60 Hz 230VAC, 50/60 Hz
0.5 Amps max. 0.5 Amps max.
LBW-420-1
24Volts DC, 21.6 – 26.4, +/- 10%
0.5 Amps max.
Dimensions 9½” H x 8” W x 4½”D
Weight 6 lbs.
Enclosure NEMA 4X rated, UL listed
Pollution Degree 1
Approvals
LBW-420 115VAC and
LBW-420-1 24VDC
Tested to UL 61010-1:2004 R7.05
CAN/CSA-C22.2 61010-1:2004
By TUV
Certificate no. CU72090607 01
Options
1. Remote ammonia sensor with box and cable (500 ft. max.)
2. Temperature (F) sensor with cable
3. External back-up battery
4. ABS washdown tube
5. Remote alarm light and horn unit with box, cable, & TEST/NORMAL/SILENCE toggle
switch.
IMPORTANT—READ THIS FIRST
PLEASE READ AND UNDERSTAND THIS SECTION
BEFORE INSTALLING AND OPERATING THE LBW-
420 DETECTOR.
Note: This manual is specific to an LBW-420 with a Solid
State-Sensor installed, it is possible to do a field conversion
to an Electrochemical Sensor. Contact Cool Air
incorporated sales [e-mail] or 763-205-0844
for more information.
CAUTION:
WARNING: RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER TO QUALIFIED SERVICE

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Rev. 10-4 9-25-2020
Copyright © 2018 by Cool Air Incorporated. All rights reserved.
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.
After applying power, test the detector to ensure it is operating
correctly. Be sure the detector has been powered for at least 20
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. If necessary,
an ABS wash down tube is available from the factory.
Avoiding Nuisance Alarms
To avoid nuisance alarms, place the detector in service mode
before:
•Programming set points and external temperature sensor
installation status.
•Performing maintenance, repairs, testing, or calibration.
•Performing refrigeration system maintenance.
•Removing the ammonia or temperature sensor.
Furthermore, be sure of the following before placing the detector in
normal operating mode:
•The ammonia concentration reading is below the Low-
alarm set point.
A nuisance alarm will also occur if the external temperature sensor
installation status is programmed to “F In” (installed) and an
external temperature sensor is not installed.

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Rev. 10-4 9-25-2020
Copyright © 2018 by Cool Air Incorporated. All rights reserved.
INTRODUCTION
The Cool Air Incorporated LBW-420 Family of Detectors is a state-
of-the-art ammonia leak detector that detects and displays ammonia
concentrations of 0 to 1000 parts per million (PPM) (solid state
sensor) or 0 to 500 parts per million (PPM) (electro-chemical
sensor).
The Cool Air Incorporated LBW-420-2 is a 230VAC powered
version of the LBW-420 ammonia leak detector (115VAC powered
detector). The LBW-420-2 requires an AC supply voltage between
200 and 250 volts AC.
The Cool Air Incorporated LBW-420-1 is a DC powered version of
the LBW-420 ammonia leak detector (AC powered detector).
The LBW420-1 incorporates a fully isolated DC to DC power
supply, allowing the LBW-420-1 to be powered from the same DC
supply as the 4-20 mA monitoring circuits without concern for
ground isolation.
The LBW-420-1 requires a DC supply voltage between 18 and 30
volts DC.
The LBW-420-1 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.
STANDARD FEATURES
All LBW-420’s come with these additional standard features:
•Programmable Hi Alarm and Low-Alarm set points.
•Selectable PPM reading start (0PPM, 10PPM, or 25PPM)
•The detector hardware and the connected system response
can be tested without exposing the sensor to ammonia.
•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.
•A NEMA 4X, UL-listed enclosure.
•Spare contacts for operating auxiliary equipment such as
exhaust fans, king valves, compressors, and additional

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Rev. 10-4 9-25-2020
Copyright © 2018 by Cool Air Incorporated. All rights reserved.
alarm systems. This relay can be set to operate as an
indication of an error only, error and active with low alarm
relay or error and active with alarm relay.
In addition to the standard features, the LBW-420 and LBW-420-1
can be equipped with these options:
•A remote ammonia sensor with cable allowing the sensor
to be located a maximum of 500 feet away from the
detector.
•An external back-up battery to keep the detector working
during loss of main power.
•External Temperature Sensor (display only, NO 4 to 20mA
output)
•RLV connection, for monitoring Relief Line vents
•An ABS wash-down tube installed over the sensor so that
it does not get wet during washdown.
•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.
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 external temperature (if an external temperature sensor is in
use), and more, depending on the position of the rotary selector
switch. Ammonia concentration is displayed in parts per million
and temperature is displayed in degrees Fahrenheit (“F”). The
LED’s provide an indication of ammonia concentration and alarm
status at a glance.

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Rev. 10-4 9-25-2020
Copyright © 2018 by Cool Air Incorporated. All rights reserved.
For information on how the display indicates ammonia
concentrations, see the sections on ammonia leak indication
Four-digit seven segment display.
In normal operating mode this will
display the ammonia concentration
in parts per million (PPM). It will
also be use in setting options and
calibration. Optionally it can display
temperature.
Low Alarm indication
Pre-Alarm Relay will be
active when this is on.
Hi Alarm indication
Alarm Relay will be active
when this is on.

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Rev. 10-4 9-25-2020
Copyright © 2018 by Cool Air Incorporated. All rights reserved.
Ammonia Sensor
The detector comes with a solid-state, long-life sensor that has a
high sensitivity to amine compounds and a quick response to
concentrations of ammonia. The sensor is protected by a flame
arrestor and has an integral heater and a ceramic base that is
resistant to severe environments.
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.