Background

This pairing and wiring is used when the air handler ordered is not setup for communication, but communication wire is needed for the application. This application may be BAS control, zone sensor control, SZVAV control, or Symbio full functionality, for some examples. The VFD will need to be reprogrammed, and a Modbus communication wire installed directly to the VFD essentially modifying the unit close to an air handler (15th digit = D).

Symbio 700 Quick Links

Equipment

Condenser: Odyssey A2L Condenser with Symbio 700 controls

Air Handler: Odyssey A2L AHU with Symbio control boards and model number digit 15 = C

Field Wiring

How many wires do I need?

1 - Up to 7 conductor thermostat wire between the thermostat OR zone sensor and condenser

1 - Up to 6 conductor control wire between the AHU and condenser

2 - 2-conductor twisted, shielded, stranded communication wires between the AHU and condenser.

Cable Identification

AHU Wiring to Condenser

Cable #1 Modbus Communication

Cable #2 Control Wiring

Cable #3 IMC Communication

(Only required when an Indoor Options Module is installed)

Condenser to Thermostat

Cable #4 Thermostat Wiring

Cable #4 Zone Sensor Wiring

*Zone sensor wiring shown for BAYSENS135, other mechanical zone sensors are similar.

Emergency Stop Wiring

From Stop Devices to Symbio 700

Wiring above reflects normally closed safeties. Typically, condensate overflow switches (or pan switches) are normally closed devices. If using normally open devices, they can be wired in parallel, and the Customer Connection Polarity does not need to be changed.

For more information see the links below:

Trane Commercial Help Center - Symbio™ 700 - Emergency Stop Input
Trane Commercial Help Center - Symbio 700 Demand Limit and Emergency Stop Polarity

Configuring the Symbio 700

Odyssey condensers can be paired with many different Odyssey AHUs, 3rd party AHUs and indoor coil assemblies. Due to this, Symbio 700 must be configured for the connected AHU, installed accessories, and controlling sensor/thermostat.

Here is an article on accessing and editing the Configuration through the Mobile Phone App:

Symbio™ 700 - Precedent or Odyssey - How to configure or edit configurations using the Mobile Phone App

For Variable Volume Zone Temperature (VVZT or formerly known as SZVAV) operation, set the configuration as follows:

System Type = VVZT (requires zone sensor for actual VVZT operation, conventional thermostat will operate as CVZT)
Efficiency = Standard B
Indoor Fan Type = Variable Speed (should set automatically)
Space Controller = Conventional Thermostat, Single Setpoint Zone sensor, or Dual Setpoint Zone Sensor (zone sensor will use DAT logic for compressor staging)
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, set the configuration as follows:

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 (Not required for operation, but it is already installed in the air handler. 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)

VFD programming

If assistance is needed in programming the VFD, here is an article to help:

Programming or changing parameters in the TR150 VFD

Confirm or change the following parameters in the TR150 VFD:

1. Change 3-15 from [1] Analog Input 53 to [11] Local Bus Reference.
2. Change 5-10 from [8] Start to [0] No Operation
3. Change 8-01 from [0] Digital and Control Word to [2] Control Word Only
4. Change 8-03 to [15] 15 seconds
5. Change 8-04 to [2] Stop
6. Change 8-30 to [2] Modbus RTU
7. Change 8-31 to [2] Address 2
8. Change 8-32 to [7] 115200 Baud
9. Change 8-33 to [0] Even Parity, 1 Stop Bits
10. Change 8-35 to [0.005] 5ms Min Response Delay Time
11. Change 8-36 to [0.1] 100mx Max Response Delay Time

WARNING:

Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.

A2L Odyssey Pairing Y - Odyssey Condenser paired with Odyssey Air Handler (15th digit = C)