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Hot Gas Bypass Contactor Relay (3C) (Optional)
This relay, located in the power panel, controls the opening of the hot gas bypass valve. The
PIC energizes the relay during low load, high lift conditions.
Control Transformers (T1-T4)
These transformers convert incoming control voltage to either 21 vac power for the PSIO
module and options modules, or 24 vac power for 3 power panel contactor relays, 3 control
solenoid valves, and the guide vane actuator. They are located in the power panel.
Click here for Figure 8 — 19XL Controls and Sensor Locations
Click here for Figure 9 — Control Sensors (Temperature)
Click here for Figure 10 — Control Sensors (Pressure Transducer, Typical)
Click here for Figure 11 — Control Panel (Front View), with Options Module