Which statement best describes the heating behavior when 115VAC is applied and ON/OFF state may be either?

• A. The drain masts heat only when the ON/OFF state is ON.
• B. The drain masts heat when 115VAC is applied and the ON/OFF state is OFF.
• C. The drain masts heat whenever 115VAC is applied to the controller, regardless of the ON/OFF state.
• D. The drain masts heat when 230VAC is applied.

Answer: (C)

Heating is driven by the presence of the 115 VAC supply itself, not by the ON/OFF control. In this design, the drain masts are powered from the same 115 VAC feed that energizes the controller, so whenever 115 VAC is applied, current flows through the heater regardless of the ON/OFF state. The ON/OFF control may affect other functions, but it does not interrupt the heater path. The 230 VAC option isn’t applicable here since the system uses 115 VAC.