The Weil Mclain transformer-relay wiring diagram provides a visual representation of how the different wires and connections should be made to ensure proper functioning of the heating system. It illustrates the connections between the transformer, relay, thermostat, and other components, helping you understand the flow of electricity and how.. The Weil McLain transformer-relay wiring diagram provides a clear visual representation of how the various components of the system are connected and how the electricity flows. It is essential for technicians and electricians to refer to this diagram when installing or troubleshooting the heating system.
AT72H,J Plate-Mounted Transformer-Relay Receptacle—use when cooling will be added later. Q633A Plate-mounted Relay Receptacle—use to install R8222 and R8228 Relays on J boxes. Above devices provide low voltage control of line voltage. Wiring Diagram R8239A AT72H/R8222B 3/4 SPDT —.. wiring diagram below: a. AHU Line 1 b. Transformer Black wire c. Heat sequencer relay output Line 1 d. Yellow wire from AHU Condenser Contactor-Power e. Condenser Common/ TStat Common 3. Connect the wires above to the relay per the wiring diagram, Figure 1. 4. Connect the wires from the HALO-LED to the supplied transformer per Figure 1. 5.