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Cool Air LBW-420-LEL User Manual

24 vdc powered ammonia leak detector
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LBW-420-LEL (24 VDC powered)
Ammonia Leak Detector

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Summary of Contents for Cool Air LBW-420-LEL

  • Page 1 Models LBW-420-LEL (24 VDC powered) Ammonia Leak Detector...
  • Page 2 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 Rev. 2.1 7-7-2017 P a g e Copyright © 2017 by Cool Air Incorporated. All rights reserved.

  • Page 3: Table Of Contents

    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 .............

  • Page 4: Important-Read This First

     Programming the alarm set point.  Performing maintenance, repairs, testing, or calibration.  Performing refrigeration system maintenance.  Removing the ammonia sensor. Rev. 2.1 7-7-2017 P a g e Copyright © 2017 by Cool Air Incorporated. All rights reserved.

  • Page 5: Introduction

    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. 4–20 mA Analog Outputs...

  • Page 6: 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. Rev. 2.1 7-7-2017 P a g e Copyright © 2017 by Cool Air Incorporated. All rights reserved.

  • Page 7: Parts Description

    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. Rev. 2.1 7-7-2017 P a g e Copyright © 2017 by Cool Air Incorporated. All rights reserved.

  • Page 8: Ammonia Sensor

    NOTE: The service switch may be a jumper instead of the switch. Rev. 2.1 7-7-2017 P a g e Copyright © 2017 by Cool Air Incorporated. All rights reserved.

  • Page 9: Service Jumper (Service Mode)

     Resetting the relays When the detector is in operation, this switch is typically set to position “0” to continuously display ammonia concentration. Rev. 2.1 7-7-2017 P a g e Copyright © 2017 by Cool Air Incorporated. All rights reserved.
  • Page 10 Caution: Before closing the detector enclosure, be sure to return the rotary selector switch to position “0” to correctly display ammonia concentration. Rev. 2.1 7-7-2017 P a g e Copyright © 2017 by Cool Air Incorporated. All rights reserved.

  • Page 11: Enclosure-Mounted Circuit Board

    Power (LBW-420-LEL) 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.

  • Page 12: Relays

    (“Resetting the Relays”) Rev. 2.1 7-7-2017 P a g e | 11 Copyright © 2017 by Cool Air Incorporated. All rights reserved.

  • Page 13: Relay Status Leds

    0 %. If the current is 20 mA, then the ammonia concentration is 1% PPM (1% range), 2% (2% range), and 10% (10% range) Rev. 2.1 7-7-2017 P a g e | 12 Copyright © 2017 by Cool Air Incorporated. All rights reserved.

  • Page 14: To 20Ma Wiring

    For this configuration, with the jumper J3 in the leftmost position (which connects pins 2 & 3) power for the 4-20 mA circuit is provided by the LBW-420-LEL. This circuit is shown below. The power supply must supply all power for the LBW-420-LELplus the 4-20 mA circuit.

  • Page 15: Wiring Diagram: Lbw-420-Lel 4 Wire - 24 Vdc Power Supply

    (which connects pins 1 & 2), power for the LBW-420-LELis supplied by the 24 VDC power supply #1 only. The power supply must supply all power for the LBW-420-LEL. Refer to the specifications page for the power requirements for the LBW-420- LEL.

  • Page 16: Installation And Setup

    For the LBW-420-LEL, the maximum allowable resistance in the receiving device must not exceed Rmax using this formula: Rmax = 50 (Vs – 7.5) Where Vs is the supply voltage in volts DC for the 4-20 mA circuit. For example, with a supply voltage of 24 VDC, the maximum allowable resistance is 825 Ω.
  • Page 17 5. Test the detector to ensure it is operating correctly (but allow at least 10 minutes after power is first applied to the detector before testing). See the section on testing the detector. Rev. 2.1 7-7-2017 P a g e | 16 Copyright © 2017 by Cool Air Incorporated. All rights reserved.

  • Page 18: Remote Alarm Light And Horn Unit

    420-LEL at a remote location. This wiring diagram shows the connections from the LBW-420-LEL to the Remote Alarm. Power for the Remote Alarm is derived from LBW-420-LEL TB7 on the Front Panel Circuit Board. An alarm signal is derived from the LBW-420-LEL enclosure-mounted circuit board.

  • Page 19: Programming And Operation

    PROGRAMMING AND OPERATION The LBW-420-LEL detector is easy to program and operate. Follow the instructions in this section to:  Program the ammonia alarm set point  Set the 4 to 20mA range  Set the Service mode time out Programming the Ammonia Alarm Set Point The Alarm set point can be set from .1% to 9.9% in .1% increments.

  • Page 20: Programming The 4 To 20 M A Range

    Once you have selected the desired service mode timeout you must hold the ENTER button for two seconds before removing the SET 1 jumper or changing the rotary switch. Rev. 2.1 7-7-2017 P a g e | 19 Copyright © 2017 by Cool Air Incorporated. All rights reserved.

  • Page 21: Test And Calibration

    When the ammonia concentration reaches the Alarm set point the Alarm LED (red) will blink.  Digital display shows an increasing concentration of ammonia in PPM. Rev. 2.1 7-7-2017 P a g e | 20 Copyright © 2017 by Cool Air Incorporated. All rights reserved.

  • Page 22: Calibrating The Detector

    Remember, this step is only required if the service jumper was moved to the “ON” position in step # 2 above. Calibration is now complete. Rev. 2.1 7-7-2017 P a g e | 21 Copyright © 2017 by Cool Air Incorporated. All rights reserved.

  • Page 23: Technical Support

    TECHNICAL SUPPORT For technical support, contact Cool Air Incorporated using any of these methods: Contact: Technical support Phone: (763) 205-0844 (USA) Fax: (763) 432-9295 (USA) E-mail: info@coolairinc.com Web site: www.coolairinc.com Address: Cool Air Incorporated 1544 134 Ave NE Ham Lake, MN 55304 Rev.

  • Page 24: Warranty

    Exclusions: A. If an ammonia gas sensor is covered by this thirty-six (36) month limited warranty, the ammonia gas sensor shall Rev. 2.1 7-7-2017 P a g e | 23 Copyright © 2017 by Cool Air Incorporated. All rights reserved.
  • Page 25 OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED Rev. 2.1 7-7-2017 P a g e | 24 Copyright © 2017 by Cool Air Incorporated. All rights reserved.
  • Page 26 REGARDLESS OF FORM, ARISING OUT OF THE TRANSACTIONS UNDER THIS WARRANTY MAY BE BROUGHT BY THE PURCHASER MORE THAN FIVE YEARS AFTER CAUSE OF ACTIONS HAS OCCURRED. Rev. 2.1 7-7-2017 P a g e | 25 Copyright © 2017 by Cool Air Incorporated. All rights reserved.

  • Page 27: Lbw-420 Specifications

    1. 100 to 240VAC to 24VDC power supply 2. Remote alarm light and horn unit with box, Options cable, & TEST/NORMAL/SILENCE toggle switch. Rev. 2.1 7-7-2017 P a g e | 26 Copyright © 2017 by Cool Air Incorporated. All rights reserved.
  • Page 28 1544 134 AVE NE, Ham Lake, MN 55304 USA Phone (763) 205-0844 Fax (763) 432-9295 info@coolairinc.com www.coolairinc.com Rev. 2.1 7-7-2017 P a g e | 27 Copyright © 2017 by Cool Air Incorporated. All rights reserved.

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