Gas Fitter Practice Test

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A hot surface igniter requires how many volts to operate properly?

  1. 24 to 30 mV

  2. 24 to 30 mV

  3. 115 to 125 VAC

  4. 190 to 240 VAC

The correct answer is: 115 to 125 VAC

The correct voltage range for a hot surface igniter to operate properly is between 115 to 125 VAC. This voltage allows the igniter to heat sufficiently to ignite the gas being supplied to the burner. Hot surface igniters work by using a resistive heating element that, when energized, reaches a high temperature. This is essential for ensuring that the gas ignites quickly and efficiently, preventing delayed ignition which can be hazardous. Maintaining the appropriate alternating current (VAC) range is crucial because operating below this voltage may result in inadequate heating and unreliable ignition, while operating above it can potentially damage the igniter. In contrast, the other options present voltage ranges that are significantly lower and unsuitable for igniting gas appliances, as they typically refer to control circuits or low voltage applications, which do not apply to the high-temperature requirements of hot surface igniters.

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