Gas Heat ESCO Practice Exam

Failure to wire a replacement low voltage transformer in an electronic ignition furnace based on its noted polarity will:

1. Cause flame rectification problems

2. Cause the transformer to overheat

3. Lead to motor malfunction

4. Prevent the fan from operating

The correct answer is: Cause flame rectification problems

Wire polarity refers to the direction in which the wires are connected. In an electronic ignition furnace, if the replacement low voltage transformer is not wired based on its noted polarity, it can cause flame rectification problems. This is because the direction of current flow in the wires affects the operation of the flame rectification sensor, which is responsible for detecting the pilot flame and allowing the furnace to start. Option B is incorrect as a wrong wire polarity would not directly cause the transformer to overheat. Options C and D are also incorrect as they are not directly related to the issue of wire polarity and would not be affected by it.