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Copeland MRLDS-250 User Manual

Infrared gas detector
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USER MANUAL
MRLDS-250
Infrared Gas Detector
Installation and Operation User Manual

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Summary of Contents for Copeland MRLDS-250

  • Page 1 USER MANUAL MRLDS-250 Infrared Gas Detector Installation and Operation User Manual...
  • Page 2 Copeland 1065 Big Shanty Road NW, Suite 100 Kennesaw, GA 30144 USA 770-425-2724 • 1-800-829-2724 www.copeland.com Email: ColdChain.TechnicalServices@copeland.com...

  • Page 3: Table Of Contents

    5.2.2 Configuration Parameters ...................................... 14 5.3 Completing Setup ....................................18 6 FUNCTIONAL TESTS AND ADJUSTMENTS.................... 19 6.1 Introduction ......................................19 6.2 Bump Testing vs. Adjusting Detector Response........................20 6.3 Bump Testing .....................................20 6.4 Adjustment Using Calibration Gas..............................21 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.
  • Page 4 7.6 Output Status Flags ...................................25 8 TROUBLESHOOTING............................26 8.1 Fault Codes......................................26 8.2 Diagnostic Attributes (P.-18)................................27 8.3 Resetting the MRLDS-250 to Default Values ..........................28 8.4 Other Symptoms....................................29 9 REPLACEMENT PARTS AND ACCESSORIES ..................30 APPENDIX: E2 SETUP............................31 026-1315 R7 MRLDS-250 I/O Manual...

  • Page 5: Introduction

    The MRLDS-250 can be used on a stand- Table 1-1 Broadband Gas Groups alone basis or integrated into controls or a Building Management System (BMS).

  • Page 6: Detecting Specific Gases

    Parameter 11 and other configuration instructions. Figure 1-2 - Broadband Gas Groups 1-4 1.2.3 Detecting Specific Gases Figure 1-3 - Gas-Specific MRLDS-250 Gas Detectors Each gas-specific gas detector is shipped factory calibrated to its specific target refrigerant. Refer to Figure 1-3 and Table 1-1.

  • Page 7: Remote Controller Options

    Remote Controller Options Table 1-3 Changing Gas Types and Accuracy The MRLDS-250 can connect to any controller through the standard analog output (voltage and current; see Table 1-2 for options), the standard alarm relay, or the digital Modbus RTU communications interface.

  • Page 8: Specifications

    102 x 140 x 37mm 180g Enclosure ABS plastic; UL flammability rating of 94V-0 Approvals CE, MET/IEC/EN 61010-1 When filtering is disabled (see Configuration Parameters P.-19), the unit will respond to concentrations sub-10 PPM. 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.

  • Page 9: Mounting The Gas Detector

    Mounting the Gas Detector Warnings and Prerequisites Explosion hazard! Do not mount the MRLDS-250 in an area that may contain flammable liquids, WARNING vapors, or aerosols. Operation of any electrical equipment in such an environment constitutes a safety hazard. The MRLDS-250 contains sensitive electronic components that can be easily damaged. Do not...

  • Page 10: Machinery Rooms

    Do not apply caulking or other material around the gas detector base. The gas detector relies on air CAUTION exchange through the spaces between the base and the gas detector housing. Do not obstruct the small gap around the housing and the base with any material. 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.
  • Page 11 For Wall Mount, attach the MRLDS-250 base to the mounting surface using two #6 screws (provided) through two of the 7 mounting holes, and be careful not to over-tighten the screws. Refer to Figure 2-2 for the locations of mounting holes on the base.

  • Page 12: Wiring And Configuration

    Wiring and Configuration Overview Wiring Supply Power (24VAC or 24VDC) Prior to wiring and configuring the MRLDS-250, ensure the following conditions have been met: Incorrect wiring may permanently • MRLDS-250 backplate is mounted in an appropriate damage the gas detector and void the CAUTION location.

  • Page 13: Wiring Alarm Output (Analog Signal)

    Relay An alarm setpoint may be programmed from the front panel of the MRLDS-250. When the level of the detected gas exceeds the alarm setpoint, the MRLDS-250 enters the alarm state. An on-board relay is tied to the alarm state, so you may activate (or deactivate) external equipment based on the MRLDS-250’s current alarm status.

  • Page 14: Modbus Network Configuration

    No jumpers or hardware switch settings are required to configure the MODBUS communications network. This is done electronically from the front panel display. For MODBUS communications with the MRLDS-250, the default communications parameters are as follows. • Baud rate = 9600 NOTE •...

  • Page 15: Finish Installation

    If the MRLDS-250 is at the end of the RS-485 network, be sure to set the RS-485 terminator on the printed circuit board (PCB) to IN. This applies a terminating resistor to the end of the wires per the requirements of the RS-485 protocol. The terminator should be set to OUT for all other installation conditions.

  • Page 16: Operation And Stabilization

    Operation and Stabilization Power Up and Warm-up On powering up, the MRLDS-250 will sense for the presence of gas after an initial warm-up period of two to five minutes. The green LED will flash at a one-second interval during the warm up.

  • Page 17: Gas Detector Faults

    Non-critical faults typically recover by allowing the gas detector surroundings to stabilize, for example, after a defrost cycle. The gas detector continues to monitor its surroundings during non-critical faults, but may report inaccurate readings. The following occurs when a non-critical fault condition exists. Table 4-2 - MRLDS-250 Behavior During a Non-Critical Fault Item Behavior During Alarm State...

  • Page 18: Configure The Gas Detector

    P.-12. Used to increment the value or parameter displayed. Figure 5-1 - The User Interface of the MRLDS-250 Used to decrement the value or parameter displayed. The user interface consists of four pushbuttons, a 4-digit LED numeric display, and a power LED.
  • Page 19 00 OFF during normal operation when the ppm value is below the alarm setpoint (default) • 01 ON In either case, the display will blink the measured PPM value during an alarm state. RS485 Node Address - Sets the RS485 node address (0001 to 0255) 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.
  • Page 20 10% over range state (indicating that the concentration is too high for the analog output to achieve). For example, for a 1-5V setting the analog output would go to 5.5V, for 4-20 mA it would go to 22 mA and so on. 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.
  • Page 21 10- minute period after the parameter list is exited. (This allows time for the test gas to clear before the unit becomes active). If no activity occurs for ten minutes, the unit exits the Gas Test Mode. 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.

  • Page 22: Completing Setup

    5 seconds to exit the Parameter list: The gas detector is now actively monitoring its surroundings. NOTE If no buttons are pressed for two minutes, the MRLDS-250 exits setup mode automatically. 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.

  • Page 23: Functional Tests And Adjustments

    In applications where life safety is critical, calibration gas adjustment should be completed quarterly (every three months) or on a more frequent basis. Copeland is not responsible for setting WARNING safety practices and policies. Safe work procedures including calibration policies are best determined by company policy, industry standards, and local codes.

  • Page 24: Bump Testing Vs. Adjusting Detector Response

    • Check if the gas detector is connected to external systems such as sprinkler systems, plant shut CAUTION down, external sirens and beacons, ventilation, etc., and disconnect as instructed by the customer. • For bump test or calibration, the MRLDS-250 should be powered up and fully stabilized (see Section 4, Operation and Stabilization). Bump Testing Notify others that testing is underway.

  • Page 25: Adjustment Using Calibration Gas

    For improved accuracy and response, the gas detector should be protected from excess drafts NOTE while performing the adjustment. Excess air circulation may dilute the applied calibration gas and lead to a lower than expected response. 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.
  • Page 26 This allows time for the calibration gas to dissipate after testing. During offline mode, the gas detector suppresses all outputs. The display reads oFFL (offline) during 10-minute timeout. All calibration gas mixtures have a blend tolerance. The tolerance will limit the actual adjustment NOTE accuracy that is achievable. 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.

  • Page 27: Modbus Communications

    MODBUS Communications Introduction The MRLDS-250 gas detector can be configured to communicate on an RS-485 network using MODBUS-RTU protocol. Before configuring the gas detector for MODBUS communications, be sure your network connection is complete and your network termination switches are set appropriately. Refer to Section 3, Wiring and Configuration for details.

  • Page 28: Analog Output Registers

    1 to 4 (broadband 2011 Gas curve number unit) or gas type (gas none P.-11 specific) 2012 Analog output full scale PPM (R/O) 100-3500 P.-16 0=None 2013 Parity 1=Odd none P.-15 2=Even 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.

  • Page 29: Input Status Flags

    Output Status Flags are readable (using function code 01) and writable (using function code 05). Table 7-4 - Output Status Flags Description Range P.-## 0=Off 4000 Buzzer flag (0 or 1=ON) 1=On 0=Okay 4001 Test required (If operating for >1 year). (1=requires testing) 1=Test 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.

  • Page 30: Troubleshooting

    To comply with the requirements of EN378 and the European F-GAS regulation, gas detectors must be tested annually. However, local regulations may specify the nature and frequency of this test. The MRLDS-250 features sophisticated internal status monitoring and will indicate whether a fault condition exists on the front display (F.-XX, with XX being the fault number).

  • Page 31: Diagnostic Attributes (P.-18)

    See Table 8-1 for the HEX format cross reference. The records may be erased by pressing the ENTER button. Displays the number of days that the MRLDS-250 has been in service. The value of this attribute rolls over after 9999.

  • Page 32: Resetting The Mrlds-250 To Default Values

    See parameter P.-17 for information on how to recalibrate the gas detector. Before performing this operation, it is advisable to write down all the parameter settings so they can NOTE be re-programmed. Table 8-3 - Resetting MRLDS-250 to Default Values Step Description Access diagnostics menu P.-18.

  • Page 33: Other Symptoms

    Check power supply. Check Wiring. If you experience alarms in the absence of a leak, try setting an alarm delay. Alarms in the absence of a leak Perform a bump test to ensure proper operation. 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.

  • Page 34: Replacement Parts And Accessories

    NOTE: The gas detector response time will lengthen when the Splash Guard is used. The installer is responsible for determining whether the response time is suitable for the application. 026-1315 Installation and Operation Manual 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.

  • Page 35: Appendix: E2 Setup

    The Modular Refrigeration Leak Detection Sensor is Copeland’s state-of-the-art infrared refrigerant gas detector that can detect a wide range of gases. The MRLDS-250 can be used on a stand-alone basis or integrated into supervisory controls. The MRLDS- 250 can be used in locations that require continuous monitoring and to add gas detection solutions to an existing system.
  • Page 36 Stop bits = 1 Make rlay connections (NO, NC, or both) using 18 to 20 AWG If the MRLDS-250 is at the end of an RS-485 network, be sure wires to terminal block positions 10, 11, and 12 to set the RS-485 Terminator on the inside of the cover panel (see Figure A-5b), noting normally open, normally closed, PCB, to IN.
  • Page 37 How to Add an MRLDS-250 to the E2 Controller Figure A-7 - RS-485 Termination Resistor Setting 1. MRLDS-250 is only native and licensed for up to 15 Set Up Analog Output Type and Scaling devices on E2 Controllers with firmware version 4.09 and For Analog Output, look for P.-03 on the parameter list...
  • Page 38 The DIP switch setting of the MultiFlex board terminal for the MRLDS-250 should be in the OFF position (see Figure A-9) because it supplies its own voltage signal to the point: Figure A-9 - MultiFlex Input Dip Switches 026-1315 R7 MRLDS-250 I/O Manual ©2024 Copeland LP.
  • Page 39 The contents of this publication are presented for informational purposes only and they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. Copeland reserves the right to modify the designs or specifications of such products at any time without notice.

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