Course: HET 130 Heating Residential Appliances

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Lab Assignment

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Week 13 Lab Assignment: Troubleshooting

Recommended Materials

1. PPE
2. Hand Tools
3. Notepad
4. Pencil
5. Combustion Heating Systems
6. VOM
7. Clamp-on ammeter
8. Combustion Electronic Set or the CO2 & O2 fluid Analyzers
9. Draft Gauge
10. Smoke Analyzer
11. High Thermostat

Scope

The student will learn the steps in troubleshooting HVAC heating systems. By analyzing the combustion flue gases, the learner will develop the technique in adjusting the air and fuel mixture to gain the highest efficiency and learn the importance of fine-tuning the burner operation.

Procedures

1. Turn the heat system off.
2. Drill a 3/8” hole in the fuel stack pipe.
3. Start up the heating system and allow the furnace to warm up. ( 10 to 15 min)
4. Record the room temperature.
5. Take an over fire draft reading and record.
6. Take a stack temperature reading and record.
7. Insert the flue analyzer in the stack and take a sample reading and record. (Follow the manufacture’s instruction for the type of system you are using)
8. Record the CO2, O2.
9. Record the Excess air if you have an electronic or an efficiency calculator.
10. With the efficiency calculator, determine the furnace’s efficiency.

Research Questions

1. Using the information gained from the analyzing the flue gases, was the net stack temperature normal?
2. If it was not normal, what caused the stack temperature to be abnormal?
3. What was the over-fire draft reading?
4. Was the over-fire draft reading normal?
5. What was the CO2 reading?
6. What was the O2 reading?
7. Were these readings normal?
8. From these readings, what is the efficiency percentage of the burner?
9. Should the burner be adjusted to gain more efficiency?
10. What should you do to gain more efficiency of the burner?

Click on the file below to download the Lab Assignment
- HET 130 Wk 13 Lab.docx (16.04 KB)