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UNIT 54 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
54-1) What is the one advantage of a standing pilot for a gas fired space heater?
54-2) List the general sequence of operation for an induced draft furnace.
a. The thermostat calls for heat.
54-3) What happens if the pilot fails to light during a trial ignition?
54-4) List the seven categories of complaints with gas furnaces.
xEntire system operation.
54-5) What is the purpose of the draft diverter on natural draft units?
54-6) What is an indication of too much gas at the burners?
54-7) What is an indication of too much primary air?
54-8) What is an indication of too little primary air?
54-9) What happens if there is improper venting of the furnace?
54-10) What is a safety lockout?
54-11) A waving blue pilot flame may be caused by what?
54-12) How does the trial ignition period differ between a fan assisted furnace as
compared to a furnace with atmospheric burners?
Use Table 52-1, gas systems problems, to answer the following questions
54-13) What are some probable causes of noise and vibration?
54-14) What causes burner flames to rollout?
54-15) What are some possible causes of burner flashback?
54-16) What can cause the blower to come back on for a short time after cycling off?
54-17) What are some possible causes of delayed ignition?
54-18) What can cause a soot accumulation on the heat exchanger?
54-19) On some furnaces little pops and pings can be heard before the blower comes on.
What causes this noise?
54-20) A gas burner is noisy and the flames are lifting off the burner. What is the most
likely cause?
