Lennox RDS Installation And Setup Manual
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Lennox RDS Installation And Setup Manual

Lennox RDS Installation And Setup Manual

Low global warming potential (gwp) refrigerant detection system (rds) communicating control board (rds field kit - communicating)
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2024 Lennox Industries Inc.
©
Dallas, Texas, USA
This manual must be left with the
owner for future reference.
Certifications ..............................................................3
Shipping and Packing List .........................................3
Overview....................................................................3
Operating Environment Specifications ......................3
Product Features .......................................................4
Introduction ................................................................5
Installation .................................................................7
Sensor Part Number Verification ..................................... 7
Mounting Methods........................................................... 7
Mounting Location ........................................................... 7
Routing the Sensor Cable ............................................... 9
Connecting the RDS Sensor ........................................... 10
Secondary Sensor ................................................... 11
Additional Line Set Joints ............................................... 11
DIP Switch Settings ................................................. 11
Modes of Operation .................................................12
Initializing ....................................................................... 12
Normal ............................................................................. 12
Refrigerant Detected ....................................................... 12
Fault ................................................................................ 12
Diagnostic Codes ....................................................13
Red LED Diagnostic Codes ............................................ 13
Test Button Functionality .........................................14
INSTALLATION AND
Potential (GWP) Refrigerant
Detection System (RDS)
Communicating Control Board
(
RDS Field Kit - Communicating)
CONTROLS
508466-01
Contents
Test Button - Additional Functions ................................... 14
Thermostat Compatibility .........................................15
Compatibility Verification ................................................. 15
Additional Applications.............................................15
Zone HVAC System ........................................................ 15
External Alarm ................................................................. 16
Start Up Test Procedure ..........................................16
Cooling Demand ............................................................. 16
Heating Demand ............................................................ 16
Wiring Diagrams ......................................................17
Units ................................................................................ 18
Outdoor Unit .................................................................... 20
Outdoor Unit .................................................................... 21
Communicating Indoor and Outdoor Units ...................... 23
SETUP GUIDE
Low Global Warming
Supersedes 05/2024
10/2024

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Summary of Contents for Lennox RDS

  • Page 1: Table Of Contents

    Operating Environment Specifications ......3 Product Features ............4 Zone HVAC System ............15 Introduction ..............5 External Alarm ..............16 RDS Blower Control Board Dimensions ....6 Start Up Test Procedure ..........16 Installation ..............7 Cooling Demand ............. 16 Sensor Part Number Verification ........7 Heating Demand ............
  • Page 2 In addition to installing the RDS Blower Control Installation and service must be performed Board, considerations must be made regarding by a li censed professional HVAC installer sensor mounting location.

  • Page 3: Certifications

    Overview Lennox Low GWP Refrigerant Detection Sys- ® tem, also referred to as RDS Blower Control Board, ensures safe operation of Lennox res- idential HVAC systems equipped with R-454B refrigerant. The RDS Blower Control Board connects to the refrigerant detection sensor,...

  • Page 4: Product Features

    • Complies with UL 60335-2-40 approved standard • Required for all systems using R-454B refrigerant • Connects to the RDS sensor furnished with the RDS Coil Sensor Kit • Used as interface between indoor unit and thermostat to control system in case of refrigerant detection •...

  • Page 5: Introduction

    ® dential HVAC systems equipped with R-454B refrigerant. The RDS activates the blower if refrigerant levels within the cabinet reach 12% of the lower flammability limit (LFL). Power to all ignition sources within the HVAC system is automatically shut down until the RDS detects safe refrigerant levels.

  • Page 6: Rds Blower Control Board Dimensions

    RDS Blower Control Board Dimensions Top View (7-7/16 in.) Front View Rear View Side View (6-3/4 in.) (3-5/8 in.) (7-7/16 in.) (6-3/4 in.) (2-1/2 in.) (3-5/8 in.) (1-1/8 in.) (1-3/8 in.) Bo om View Figure 2. RDS Communicating Control Board - Dimensions...

  • Page 7: Installation

    “R” and “DS” at the indoor unit in finished areas, such as closets. Mount the control board and the (W914) jumper must be RDS Blower Control Board in a clean, dry en- cut. See “Communicating Indoor Controls and Float Switch” on page 17.
  • Page 8 Refrigerant Detection System Sensors The Lennox Refrigerant Detection System requires a Lennox RDS sensor located in the indoor coil. See table below. Indoor Unit Model RDS Blower Control Board Description Sensor Catalog Number • CK40CT Upflow • CK40HT Horizontal Refrigerant Detection System...

  • Page 9: Routing The Sensor Cable

    Routing the Sensor Cable Figure 3 illustrates how to best route the sensor cable from the RDS Blower Control Board to the sensor within the indoor unit for the Upflow, Downflow, and Horizontal orientations. For details on mounting the sensor itself, refer to the respective sensor kit, air handler, or coil installation guide.

  • Page 10: Connecting The Rds Sensor

    Molex connection point for a secured connection, as shown below in Figure 4. Verify the connection is free of dust, debris, and moisture. NOTE: In confined space applications, connect the second sensor to the SENSOR 2 plug. Molex Plug Clip Figure 4. Connecting the RDS Sensor to RDS Blower Control Board...

  • Page 11: Secondary Sensor

    2 to sensor 2). The default factory switch posi- • Downflow Applications: Mounted on one tions are set to OFF. The RDS Blower Control side of the evaporator coil nine(9) inches Board software reads the OFF position as an above the floor and within nine(9) inches active sensor.

  • Page 12: Modes Of Operation

    Modes of Operation continue to operate for the remainder of the seven (7) -minute cycle. The modes of operation for the RDS Blower After the blower sequence is complete, the Control Board are Initializing, Normal, Refriger- HVAC system resumes normal operation.

  • Page 13: Diagnostic Codes

    RDS Blower 1. A rapid flash indicates the RDS Blower Control Board is Control Board to in the process of sensor enumeration function. 2. A blue flash indicates a purge has previously oc- Verify the DIP curred.

  • Page 14: Test Button Functionality

    Monitoring, Refrigerant Detection, Servicing be used to complete several functions, de- and Fault. Refer to “Table 2. LED Diagnostic pending on the mode of operation of the RDS Codes” on page 13. Blower Control Board. Table 4 lists the functions of the Test button Table 5.

  • Page 15: Thermostat Compatibility

    Zone HVAC System If the RDS Blower Control Board is installed in a zone HVAC system, the RDS Blower Control...

  • Page 16: External Alarm

    Board will open all zone dampers if refrigerant Press the Test button on the RDS Blower is detected. Control Board. The system then executes a refrigerant NOTE: Proper wiring of the zone panel to detection response. the RDS Blower Control Board is...

  • Page 17: Wiring Diagrams

    Wiring Diagrams Lennox provides wires designated for wiring the sensor cable. Wires required for the RDS instal- lation is field supplied. The RDS supports all OEM and non-OEM gas furnace installations. Wiring diagrams are pro- vided for several common split furnace system configurations to identify exact wire types and terminal locations.

  • Page 18: Communicating Thermostat With Furnace And Outdoor Units

    SENSOR #2 Thermostat / Outdoor Unit Terminal Block (BLACK) Indoor Unit Terminal Block (BLUE) Communica ng Thermostat Terminal Block (BLACK) RDS Field Kit – Communica ng Communica ng Indoor Unit / Equipment Terminal Block (BLUE) Cat # 27A03 Communica ng...

  • Page 19: Communicating Thermostat, Communicating Furnace With Eim, And Non-Communicating Two Stage Heat Pump

    Non-Communicating Two Stage Heat Pump RDS Sensor SENSOR #1 SENSOR #2 0 1 2 3 UNIT TYPE HEAT STAGES HEAT PUMP SIZE RDS Field Kit – Communica ng Equipment Interface Module (EIM) Cat # 27A03 CAT # 22X18 OTHERS VENT VENT VENT VENT...

  • Page 20: Communicating Thermostat, Non-Communicating Two Stage Furnace With Eim, And Communicating Outdoor Unit

    UNIT TYPE HEAT STAGES HEAT PUMP SIZE SENSOR #1 SENSOR #2 Equipment Interface Module (EIM) CAT # 22X18 OTHERS RDS Field Kit – Communica ng Cat # 27A03 VENT Furnace Two Stage VENT VENT VENT W1 W2 W3 G Y2 Y1...

  • Page 21: Non-Communicating Thermostat, Communicating Two Stage Furnace With Non-Communicating Two Stage Outdoor Unit

    Non-Communicating Thermostat, Communicating Two Stage Furnace with Non-Communicating Two Stage Outdoor Unit RDS Sensor Thermostat SENSOR #1 SENSOR #2 RDS Field Kit – Communica ng Cat # 27A03 OPTIONAL N.C. CONDENSATE FLOAT SWITCH Two Stage Outdoor Unit Blue Communica ng Furnace...

  • Page 22: Communicating Thermostat With Communicating Furnace And Communicating Two Stage Outdoor Units

    Communicating Thermostat with Communicating Furnace and Communicating Two Stage Outdoor Units RDS Sensor Communica ng Furnace SENSOR #1 SENSOR #2 RDS Field Kit – Communica ng Cat # 27A03 TSTAT INDOOR ZONING ALARM I+ I- C NO COM NC NO COM NC...

  • Page 23: Communicating Zoning With Communicating Thermostat, Communicating Indoor And Outdoor Units

    DATS DMPR XFMR XFMR DCOM 3 AMP FUSE DCOM RDSC Field Kit – Communica ng Cat # 27A03 Lennox Smart Zoning Control Module CAT# (10C16) DCOM DCOM TSTAT INDOOR ZONING ALARM NO COM NC NO COM NC I+ I- C...

  • Page 24: Diagnostic Codes And Troubleshooting

    Diagnostic Codes and Troubleshooting Table 6. LED Diagnostic Codes State LED Diagnostic Code Action Required Initializing Flashing green None Solid green. If a prior mitigation occurred, a Monitoring None blue flash interrupts the solid green LED. Mitigating Check coil tubes for refrigerant. Repair the issue (Refrigerant Flashing blue and restart the equipment.

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