Issue:
Field wiring a UC400B or Symbio 400B to a Condenser it is necessary to remove the factory test resistor. Terminal 1TB5-2 (24VAC) should be wired to the Y terminal on the condenser and the B terminal of the condenser should be wired to Terminal 1TB5-1 (Compressor 1 BO4).
If the condenser is providing 24VAC (expects a dry contact) an isolation relay is required.