Which statement correctly states the heating behavior with 115VAC and ON/OFF independence?

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

Answer: (C)

The key idea is that heating is tied directly to the 115VAC supply, not to the ON/OFF control. With ON/OFF independence, the heating elements (drain masts) will operate as long as 115VAC is applied to the controller, regardless of whether the ON/OFF switch is on or off. That’s why the correct statement says they heat whenever 115VAC power is applied, no matter the ON/OFF state. The other options either imply the ON/OFF control gates heating, or reference a 230VAC condition that isn’t part of this scenario.