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Legacy Electromechanical Condenser with Symbio CV Air Handler
Wire thermostat to the Air Handler Relay Board J5 except for R and C, wire R to the Symbio Air Handler
Relay Board J10-1, wire “COM” to Symbio Air Handler Relay Board J10-2.
Connections between the Condenser and Air Handler
1. Thermostat Wire – 4 wires
a. The Y1 from the thermostat will go directly to the Condenser LTB1-Y1.
b. The Y2 from the thermostat will go directly to the Condenser LTB1-Y2.
c. Condenser LTB1-R to Symbio Air Handler Relay Board J10-1.
d. Condenser LTB1-B1 to Symbio Air Handler Relay Board J10-2.
Note: W1 and W2 connections are needed only if air handler has an electric heat accessory installed. A new
electric heater must be used with a Symbio air handler. Legacy electric heaters cannot reused on
Symbio air handlers.
2. If the EDC (Evaporator Defrost Control) thermostat is used, follow these steps:
a. Switch is shipped in the normally open configuration. When pairing with an electromechanical
condenser, move wire from terminal “H” to terminal “L” on EDC switch, enabling normally closed
switch operation.
b. Cut the EDC Black wire from plug J8 and move to J10-2
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