Identify the true statement among the following about heating when 115VAC is applied.

• 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 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)

The heat of the drain masts is tied to the presence of the 115 VAC supply, not the ON/OFF switch position. In this setup the heater is connected to the controller’s 115 VAC input, so as soon as 115 VAC is applied to the controller, current flows through the heater and it warms, regardless of whether the ON/OFF is shown as ON or OFF. The ON/OFF control in this design doesn't interrupt the heater path; it affects other parts of the circuit or indicators instead.

That’s why the statement that heating occurs whenever 115 VAC is applied to the controller, regardless of the ON/OFF state, is the true one. The other options imply the heater is gated by the switch or depend on a different voltage, which isn’t how this heating path is described.