Which statement reflects the heating condition as described?

• 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.
• D. The drain masts do not heat.

Answer: (A)

Heating is driven by the presence of 115 VAC power to the controller. When that power is applied, the drain masts’ heating elements energize and heat up, and this occurs regardless of the ON/OFF switch position. In other words, the heater follows the 115 VAC supply, not the switch state. Using 230 VAC isn’t the described condition for this heater, and with no power applied there’s no heating.