NATE Air Conditioning and Heat Pumps Practice Exam

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What precaution is necessary when installing a dual-fuel split system?

  1. The control system must not allow the heat pump and furnace to operate simultaneously during normal heating cycle

  2. The high-limit switch on the heat pump must be replaced with one that has a lower temperature setting

  3. The high-limit switch on the heat pump must be replaced with one that has a higher temperature setting

  4. The limit control on the furnace must be replaced with one that requires a manual reset

The correct answer is: The control system must not allow the heat pump and furnace to operate simultaneously during normal heating cycle

When installing a dual-fuel split system, it is essential that the control system does not permit the heat pump and furnace to operate simultaneously during the normal heating cycle. This precaution is critical because if both systems were to run at the same time, it could lead to significant inefficiencies and potential damage to the equipment. Operating both systems simultaneously defeats the purpose of a dual-fuel system, which is designed to optimize efficiency and energy usage by switching between the heat pump and the furnace based on outdoor temperature conditions. For instance, the heat pump is typically more efficient for heating at milder temperatures, while the furnace is better suited for extremely cold conditions. Therefore, ensuring that only one system operates at a time allows for optimal performance and energy savings, and helps prevent mechanical strain or potential damage. The other precautions mentioned focus on specific components like high-limit switches or limit controls, which may have their relevance in specific contexts but do not address the fundamental operational integrity of the dual-fuel system itself.

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