Which statement is true regarding the heating of the drain masts when 115VAC power is applied to the controller?

• A. The drain masts heat whenever 115VAC power is applied to the controller, regardless of the ON/OFF state.
• B. The drain masts heat only when the ON/OFF state is ON.
• C. The drain masts heat when 230VAC is applied to the controller.
• D. The drain masts do not heat under any condition.

Answer: (A)

Heating of the drain masts is driven by the 115V supply itself, so the heaters come on whenever 115VAC is present, regardless of the controller’s ON/OFF setting. The heater circuit is tied to the 115V power line, and its operation isn’t gated by the controller’s switch. This ensures the drain masts stay warm to prevent freezing whenever power is applied.

That’s why the other ideas don’t fit: the heater isn’t limited to only when the ON/OFF is ON, it doesn’t rely on 230VAC in this setup, and it isn’t shut off entirely under all conditions.