NATE ICE Residential Oil Heat Exam Questions With Answers Verified By Experts!!

On a "no heat" service call for an oil-fired furnace, what is the main safety precaution that the technician must take before attempting to fire the oil furnace? - ANSWER-check the combustion chamber for liquid oil On start-up of an oil unit, the technician's smoke test shows the unit to have a #8 smoke. Which of the following is the correct action that should be taken? - ANSWER-increase primary air The primary reason for using a barometric draft control on an oil furnace is to maintain: - ANSWER-appropriate CO2 content. The secondary voltage on an oil-burner ignition transformer is approximately: - ANSWER-10,000 volts Upon resetting the primary control, the burner ignites and runs normally for about 45 seconds and then stops. Which one of the following is the most likely problem? - ANSWER-a dirty or faulty cad cell What is considered confined space for an oil furnace? - ANSWER-less than 50 cubic feet per 1,000 BTUH When using a primary control system for an oil burner, what voltage levels feed the control and the furnace control circuit? - ANSWER-24 volts feed the control and 120 volts feed the control circuit Which of the following is the best procedure for checking the operation of the cad cell? - ANSWER-disconnect one cad cell lead from the primary Which of the following measurements would be needed to determine oil furnace combustion efficiency? - ANSWER-net stack temperature and CO2 concentration With an oil furnace disconnect switch off, for testing purposes a 1500 ohm resistor is inserted across both cad cell terminals on the primary control. When the power is turned back on, the burner start and runs continuously. This indicates that: - ANSWER-the primary control is faulty and should be replaced. With an oil gun burner, atomized oil is ignited by the: - ANSWER-electric arc between electrodes. A correct statement regarding the fan/limit controller is that it senses the: - ANSWER-supply air temperature in the furnace.