Pairing B Wiring and Setup: Symbio Condenser or Heat Pump with SZVAV / 2 Speed Air Handler

Introduction

This document outlines the wiring and setup procedures for Trane Symbio 700 systems, specifically pairing Symbio Condensers or Heat Pumps with SZVAV or 2-Speed Air Handlers.

Condenser: Odyssey Condenser with Symbio 700 Controls

AHU: Odyssey AHU with Symbio 700 boards and model number digit 15 = D

Symbio 700 Quick Links

• Symbio™ 700 - Where to download the Service & Installation Mobile Phone App
• Symbio™ 700 - Bluetooth Connection Instructions
• Symbio™ 700 - Precedent or Odyssey - How to configure or edit configurations using the Mobile Phone App

Wiring Requirements

How many wires do I need?

• Up to 7 conductor thermostat wire between the thermostat OR zone sensor and condenser
• Up to 6 conductor control wire between the AHU and condenser
• 2 conductor twisted, stranded, shielded communication wires between the AHU and condenser.

Cable Identification

Pairing B (Thermostat or Zone Sensor)

Odyssey SZVAV AHU (15th digit = D) with Odyssey Condenser w/ Symbio 700 Controls

This section details the cable types and their descriptions for connecting the Air Handler (Trane Odyssey VVZT/SZVAV) to the Condenser (Trane Odyssey Symbio 700) via a thermostat or zone sensor. The diagram illustrates the connections from the Air Handler's Relay Board and Zone Sensor to the Condenser's Adapter Board and Symbio 700 unit.

*Cable 1 and 3 must be stranded, twisted shielded communications wire like Trane Purple Comm or Windy City Wire #052003.

**Cable 2, 4A, 4B can be thermostat wire, recommend stranded wire for longer distances.

AHU Wiring to Condenser - Cable #1 Modbus Communication

This section details the Modbus communication wiring between the AHU and the Condenser.

The diagram shows connections from the AHU Relay Board (J4, J5, J6, J7) to the Adapter Board (J15, J16, J18) and Symbio 700. Specifically, Modbus+ and Modbus- signals run from J7-1 and J7-2 on the Relay Board to J16-1 and J16-2 on the Adapter Board, respectively. A drain wire from J15-2 on the Adapter Board is taped back at the AHU.

AHU Wiring to Condenser - Cable #2 Control Wiring

This section details the control wiring between the AHU and the Condenser.

The diagram illustrates control wiring from the AHU Relay Board (J10, J5, J4) to the Adapter Board (J15, J18) and Symbio 700 (J16). Specific connections include 24VAC for the Relay Board, communication/neutral lines, evap coil frost protection, fan interlock, and IMC link power.

AHU Wiring to Condenser - Cable #3 IMC Communication

This section details the IMC communication wiring between the AHU and the Condenser.

The diagram shows IMC communication wiring from the AHU Relay Board (J4) to the Adapter Board (J15). IMC+ and IMC- signals run from J4-3 and J4-4 to J15-3 and J15-4 respectively. A drain wire from J15-2 is taped back at the AHU.

Condenser to Thermostat - Cable #4A Thermostat Wiring

This section details the thermostat wiring from the Condenser's Symbio 700 to the Thermostat.

The diagram shows the Symbio 700 J21 terminals connecting to the Thermostat terminals (R, Y1, W1/O, G, W2, Y2, Aux, Pulldown, Comm). It details the function of each connection, such as 24VAC, cooling stages, heating stages, fan control, and emergency heat.

Condenser to Thermostat - Cable #4B Thermostat Wiring

This section details the thermostat wiring from the Condenser's Symbio 700 to the Zone Sensor.

The diagram shows the Symbio 700 J19 terminals connecting to the Zone Sensor terminals (1-7). It details the function of each connection, including Zone Temperature, Common, Cooling Setpoint, Unit Mode, Heating Setpoint, and 24 VAC supply.

*BAYSENS135A Shown

Emergency Stop Wiring

From Stop Devices to Symbio 700

This section describes the wiring for emergency stop functions from external stop devices to the Symbio 700.

The diagram illustrates connections for normally closed safety devices like condensate overflow switches or pan switches. The wiring reflects these normally closed safeties. If normally open devices are used, they can be wired in parallel, and the Customer Connection Polarity setting does not need to be changed.

Important Note: Requires changing the polarity on UC J18-2 to NORMALLY CLOSED. This setting is found in the Symbio App under: TOOLS > SERVICE > CUSTOMER CONNECTION POLARITY > SWITCH "EQUIPMENT SHUTDOWN INPUT" TO REVERSED.

For more information, refer to the following links:

• Trane Commercial Help Center - *LCU Symbio 700 Emergency Stop Input
• Trane Commercial Help Center - Symbio 700 Demand Limit and Emergency Stop Polarity

Configuring Symbio 700

Odyssey condensers can be paired with various Odyssey AHUs, third-party AHUs, and indoor coil assemblies. The Symbio 700 must be configured for the connected AHU, installed accessories, and controlling sensor/thermostat.

For Variable Volume Zone Temperature (VVZT or SZVAV) Operation (requires zone sensor):

• System Type: VVZT (requires zone sensor for actual VVZT operation; tstat will operate as CVZT)
• Efficiency: Standard B
• Indoor Fan Type: Variable Speed (should set automatically)
• Space Controller: Single Setpoint Zone sensor, or Dual Setpoint Zone Sensor
• Frostat: Installed (should install automatically)
• Discharge Temperature Sensor: Installed (should install automatically)

Field installed electric heat only

TTA condenser

• Primary Heating Source: Electric
• Primary Heating Stages: 1 or 2 (depending on electric heat kit stages)

TWA condenser

• Secondary Heating Source: Electric
• Secondary Heating Stages: 1 or 2 (depending on electric heat kit stages)

For Multispeed fan operation:

• System Type: CVZT (thermostat or zone sensor)
• Efficiency: Standard B
• Indoor Fan Type: Multi Speed
• Space Controller: Conventional Thermostat, Single Setpoint Zone sensor, or Dual Setpoint Zone Sensor
• Frostat: Installed
• Discharge Temperature Sensor: Installed (with zone sensor will use DAT logic for compressor staging) or Not Installed

Field installed electric heat only

TTA condenser

• Primary Heating Source: Electric
• Primary Heating Stages: 1 or 2 (depending on electric heat kit stages)

TWA condenser

• Secondary Heating Source: Electric
• Secondary Heating Stages: 1 or 2 (depending on electric heat kit stages)

Once changes are complete, apply them by selecting the check mark (APPLY on Apple devices) at the top of the screen. If the check mark is grey, look for options with '---' and fill them in.

After changes are saved, the condenser will automatically start looking for the VFD and Indoor Options Module (big board in AHU). The supply fan will engage with a call for fan.