Trane SYMBIO 700 Troubleshooting Manual page 152

5. VFD Programming
3-15 Reference 1 Source – [11] Local Bus Reference
5-10 Terminal 18 Digital Input – [0] No Operation
5-12 Terminal 27 Digital Input – [0] No Operation
5-40 Function Relay – [0] (Relay 1) [6] Running / no warning (Relay 2)
8-01 Control Site – [2] Control Word Only
8-02 Control Source – [1] FC Port
8-03 Control Timeout Time – 15.0 sec
8-04 Control Timeout Function – [2] Stop
8-30 Protocol – [2] Modbus RTU
8-31 Address – 2
8-32 Baud Rate – [7] 115200 Baud
8-33 Parity / Stop Bits – [0] Even Parity, 1 Stop Bit
8-35 Minimum Response Delay - .005 sec 5ms
8-36 Maximum Response Delay – .01 sec 100ms
6. If using the EDC (Evaporator Defrost Control) thermostat in the legacy air handler, it will be necessary to
add a 24VAC relay with Normally Closed contacts to change the action of the EDC from N.C. to N.O. for
connection to the Symbio 700 in the condenser. Make wiring changes indicated below.
a. Add a field wire from LTB2-CD to one side of the coil of the field supplied 24VAC relay (R).
b. Add field wire between other side of relay coil and LTB2-B1.
c. Connect normally closed relay contact to Symbio Condenser (UC) J16-1 & 2
d. In Edit Configuration set Demand Management to Demand Limit and in Settings, Refrigeration
set Cooling Demand Limit Capacity Enable Setpoint to 0%
Optional
To get rid of the Indoor Options Module Communication Status, Diagnostic: Unit Communications Failure
and Frostat Alarms you could replace the RTOM with a BAYMODU001 Symbio Options Board kit.
The Symbio Options Board has two mounting holes that line up with the RTOM mounting holes, but be
aware the Symbio Options Board is 5.5" x 6.75" make sure there is room in the control box.
If you chose to go this route, the following additional wires would have to be added.
Thermostat Wire – 2 Wires
b. Symbio Condenser Adapter Board J15-1 & 2 splice to Symbio Options Board P5-1 & 2.
Shielded Twisted Pair (ground shield in air handler)
a. Symbio Condenser Adapter Board J15-3 & 4 splice to Symbio Options Board P5-3 & 4
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