Gas Heat ESCO Practice Exam

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.