A sequencer timer uses what to close the contact points to the heater element?

Prepare for the HVAC Excellence Electric Heat ESCO Test. Engage with flashcards and multiple-choice questions, with hints and explanations for each question. Ensure success on your upcoming exam!

A sequencer timer is designed to control the sequence in which heating elements are activated, thus ensuring an efficient heating process and preventing an overload that could lead to damage or safety hazards. In this context, heated snap-discs or bi-metal strips are essential components of the sequencer timer mechanism.

These components function based on temperature changes. As the temperature rises, the bi-metal strip bends due to the differing expansion rates of the metals composing it. Once a certain temperature is reached, the bending motion triggers the contact points to close, allowing current to flow to the heater element. This direct temperature response ensures that the heating elements are activated in a controlled manner and helps maintain optimal operating conditions.

The other options involve different functionalities. For instance, magnetic coils and electrical relays are primarily used for controlling circuits but do not provide the same temperature-based activation that bi-metal strips do. Thermal fuses, on the other hand, are safety devices that interrupt the circuit in case of overheating rather than managing the timing or sequence of heating elements.

Thus, heated snap-discs or bi-metal strips are integral to the operation of sequencer timers, making them the correct answer in this scenario.

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