Trane Symbio 700 - Symbio Condenser (Cooling Only) with Legacy 2 Speed Electromechanical Air Handler

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Symbio Condenser (Cooling Only) with Legacy 2 Speed Electromechanical Air
Handler
Wire the thermostat to the Symbio 700 J21 except for R and C, wire thermostat R to Symbio Adapter Board
J15-1, wire thermostat C to Symbio Adapter Board J15-2.
Connections between Condenser and Air Handler
1. Thermostat Wire – 4 Wires w/o electric heat, 5 Wires with electric heat
a. Symbio Condenser Adapter Board J15-1 to Air Handler LTB2-R.
b. Symbio Condenser Adapter Board J15-2 to Air Handler LTB2-B1.
c. Symbio Condenser UC J21-6 to Air Handler LTB2-Y2. (Y1 is not used in the Air Handler)
d. Symbio Condenser Adapter Board J18-1 to Air Handler LTB2-G.
e. Symbio Condenser UC J21-3 to Air Handler LTB2-W1 (W1 and W2 are jumped together in the Air
Handler to take care of activating the HSR1)
2. Symbio Configuration
a. Space controller configuration: When connecting a Conventional Thermostat to the Symbio UC,
ensure that the Symbio 700 UC configuration has been set for the appropriate device -
Conventional TStat.
b. Indoor Fan Type: When connecting the SymbioTM Condenser to an electromechanical air handler
with 2-speed fan operation, ensure that the Symbio 700 UC Indoor Fan Type configuration is set to
its default “Single Speed” selection. The Air Handler Relay Board will take care of switching the fan
speeds based on the thermostat call.
c. Primary Heating Source: If the Air Handler has Electric Heat, be sure to configure the Symbio 700
UC for Primary Heating Source – Not Installed or you will get a Diagnostic for Options Module
Comm Fail (The Symbio 700 will still turn the Indoor Fan on with a W1 call)
3. 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. Move wire 37L(BL) from LTB2-B2 to one side of the coil of the field supplied 24VAC relay (R).
b. Move wire 68AK(Y) to LTB2-R.
c. Add field wire between other side of relay coil and LTB2-B1.
d. Install a jumper between LTB2-B1 and LTB2-B2 (if not already present)
e. Connect normally closed relay contact to Symbio Condenser (UC) J16-1 & 2
f. In Edit Configuration set Demand Management to Demand Limit and in Settings, Refrigeration set
Cooling Demand Limit Capacity Enable Setpoint to 0%