Tracer® Communication Module (CM3I) Installation Instructions

Product Details

Ordering Numbers

X13651812001

MOD04065

Kit Contents

• Tracer® Communication Module (CM3I)
• USB Cable
• Phoenix Connector with Chassis Ground Wire
• Installation Instructions

Safety Warnings and Notices

General Safety Warning

[WARNING] Only qualified personnel should install and service the equipment. Improper installation, adjustment, or alteration by unqualified persons could result in death or serious injury. Observe all precautions in the literature and on equipment tags.

Advisory Definitions

• [WARNING]: Potentially hazardous situation; failure to avoid could result in death or serious injury.
• [CAUTION]: Potentially hazardous situation; failure to avoid could result in minor or moderate injury, or unsafe practices.
• [NOTICE]: Situation that could result in equipment or property-damage only accidents.

Important Environmental Concerns

Trane advocates responsible handling of all refrigerants, acknowledging potential environmental impacts of certain chemicals on the ozone layer.

Important Responsible Refrigerant Practices

Technicians handling refrigerants must be certified. Adhere to local rules, including the US Federal Clean Air Act (Section 608) and any state/municipal requirements for refrigerant management.

Proper Field Wiring and Grounding Required

[WARNING] Failure to follow code could result in death or serious injury. All field wiring must be performed by qualified personnel. Improper installation and grounding pose FIRE and ELECTROCUTION hazards. Follow NEC and local/state/national electrical codes.

Personal Protective Equipment (PPE) Required

[WARNING] Failure to wear proper PPE could result in death or serious injury. Technicians must use PPE for electrical, mechanical, and chemical hazards as per manual, tags, labels, SDS, and OSHA guidelines. This includes cut-resistant gloves, safety glasses, hard hats, fall protection, electrical PPE, and arc flash clothing when necessary. For hazardous chemicals, consult SDS and OSHA/GHS guidelines. For arc flash risks, use appropriate PPE per OSHA, NFPA 70E, or country-specific requirements before servicing.

Follow EHS Policies

[WARNING] Failure to follow instructions could result in death or serious injury. Trane personnel must follow company EHS policies. Non-Trane personnel must follow local regulations.

Hazardous Voltage

[WARNING] Failure to disconnect power before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects, and follow lockout/tagout procedures. Verify absence of power with a voltmeter.

Proper Ground Connection Required (AC Power)

[WARNING] Failure to follow instructions could result in death or serious injury. Ensure the 24 Vac transformer is grounded through the controller. Measure voltage between chassis ground and controller ground terminals; expected result is Vac < 4.0 volt.

Equipment Damage

[NOTICE] Failure to follow instructions could result in damage to the controller, power transformer, or I/O devices due to inadvertent connections. Remove power before making I/O connections.

General Information

The Tracer® CM3I (Isolated Comm3) module provides the communication interface between the Tracer® SC+ and Isolated Comm3 devices. It connects to any Synchrony USB port.

Installation Location Guidelines

• Protected from weather elements.
• Restricted from public access to minimize tampering and vandalism.
• Near the SC+ controller to reduce wire usage.
• Easily accessible by service technicians.

Specifications

CM3I Dimensions

Figure 1. CM3I dimensions. The module has a width of approximately 60.9 mm [2.40 inches], a height of 103.0 mm [4.05 inches], and a depth of 35.6 mm [1.40 inches]. Mounting conforms to DIN Standard 43880.

Environment and Power

Agency Compliance

• UL-916
• UL94-5VA Flammability
• CE Marked per EN61326-1
• FCC Part 15, Subpart B, Class B Limit
• CUL C22.2-signal devices
• AS/NZS CISPR 32:2015 Class B Limit
• VCCI-CISPR 32:2016: Class B Limit
• CAN ICES-003(B)/NMB-003(B)

Mounting and Wiring

Required Tools

A 1/8-inch (3 mm) flat-bladed screwdriver is required for module functions on DIN rail.

Mounting or Removing the CM3I

To mount the CM3I on a DIN rail:

1. Hook the device over the top of the DIN rail.
2. Gently push the lower half of the device towards the arrow direction until the release clip clicks into place.

To remove or reposition the CM3I:

1. Disconnect all connectors before removal or repositioning.
2. Insert a screwdriver into the slotted release clip and gently pry upward to disengage the clip.
3. While holding tension on the clip, rotate the device away from the DIN rail.
4. If repositioning, push the device until the release clip clicks to secure it to the DIN rail.

Note: Follow recommended procedures if using other manufacturers' DIN rails and enclosures.

Installation Instructions

1. Connect the USB-C end of the cable to the CM3I module.

2. Connect the USB-A end of the cable to a USB port on the controller.

Important: Route the USB cable to prevent damage from panel doors or obstructions. Replace kinked, cut, or damaged cables. Do not route the USB cable near electrically noisy cables (e.g., AC power, switched wires) – maintain a minimum distance of 150 mm.

Wiring Termination

A termination resistor is required on an isolated Comm3 communication link. Determine resistance value and location based on Configuration Type and Wire length:

Daisy Chain Configuration

• 0 to 800 ft (0 to 244 m): 270 to 330 Ω on the last device.
• 800 to 2,500 ft (244 to 762 m): 3 kΩ at the CM3I.
• > 2,500 ft (> 762 m): 100 Ω on the last device.

Branch Configuration

• Any wire length: 270 to 330 Ω at the end of one branch or at the CM3I. Additional resistors on other branches are optional.

Isolated Comm3 Device Network Wiring

Consider appropriate cable and length limitations for proper network communication. Max length for 18 AWG is 4,000 ft; for 22 AWG is 2,000 ft. Longer wires may cause issues.

Note: Do not mix isolated and non-isolated device types on a single link.

1. Attach communication wire between adjacent devices, maintaining polarity.

2. Join shield wires at each controller and insulate with electrical tape.

3. Repeat steps 1 and 2 for all controllers on the link.

Note: Refer to the specific controller's installation guide for more details.

CM3I Module Connection with Tracer® SC+

Figure 3. CM3I module connection with Tracer® SC+. Shows the CM3I module connected via USB to a Tracer® SC+ controller. It also illustrates the connection to the Isolated Comm3 network, with TX and RX lines, and a proper ground connection from the CM3I to chassis ground, and then to earth ground.

Network Wiring Details

Figure 4. CM3I network wiring details. Depicts network wiring for multiple devices, including legacy controllers and the CM3I. It shows connecting devices in a daisy-chain or branch configuration via the COMM3 port, with shield wires twisted together and insulated.

Connecting, Addressing, and Discovering the CM3I

CM3I LEDs

Figure 5. CM3I LEDs. The module features a Marquee LED which is green when USB power is present. It also has Isolated Comm3 TX and RX LEDs that blink during data transfer. The TX LED blinks continuously to search for devices, while the RX LED blinks when receiving data.

After powering up the Tracer SC+ controller, observe the CM3I LEDs:

Marquee LED

Green: Indicates USB power is present.

Isolated Comm3 TX and RX LEDs

When an Isolated Comm3 device connection is established:

• TX LED: Blinks at the data transfer rate when the unit transfers data. It blinks constantly to look for devices.
• RX LED: Blinks at the data transfer rate when the unit receives data.

Troubleshooting LED Status

If LEDs are not lit:

• Determine if the Isolated Comm3 device is attempting to communicate with the controller or is capable of doing so.
• Check if the communication status shows as down continuously.

Trane, a Trane Technologies company (NYSE: TT), creates comfortable, energy-efficient indoor environments. Visit trane.com or tranetechnologies.com for more information.

Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.

Document Revision: BAS-SVN236B-EN, July 2024. Supersedes BAS-SVN236A-EN (April 2024).