Title: Lab Assignment
Course: HET 130 Heating Residential Appliances > Section: HET 130 Heating Residential Appliances

Breadcrumb Navigation

Lab Assignment »

Lab Assignment

page 1
Week 7 Lab Assignment: Gas Equipment Controls

Recommended Materials

1. PPE
2. Hand Tools
3. Notepad
4. Pencil
5. Hot Surface Ignition
6. Hot Surface Igniter
7. High Efficient furnace
8. VOM
9. Micro-amp meter
10. Manometer

Scope

The student will check and adjust the draft and combustion blower assembly pressure switch, check the hot surface igniter, and check the flame sensing rod.

Procedures

1. Locate a 90% efficiency furnace.
2. Turn the power source on.
3. Install the manometer to read the draft pressure onto the pressure switch.
4. Set the thermostat above the room temperature.
5. Start the unit up.
6. Record the pressure reading from the manometer.
7. Restore the pressure hose from the pressure switch.
8. Turn the unit off.
9. Turn the gas off.
10. Remove the hot surface igniter electrical connector.
11. Connect the VOM to the power leads from the connector.
12. Turn the power on and set the thermostat above the room temperature.
13. Record the voltage.
14. Restore the hot surface igniter after turning the power source off.
15. Connect the micro-amp meter in series with the flame rod.
16. Turn the power on and set the thermostat above the room temperature.
17. Record the micro-amp reading.
18. Turn the power off, remove the meter, restore the wiring, and set the thermostat to normal.

Research Questions

1. What was the reading from the manometer?
2. Was this reading in range?
3. What is the purpose of the induce draft pressure switch?
4. Are there other methods to do prove air flow?
5. What was the voltage reading from the hot surface igniter leads?
6. Was this voltage normal?
7. What was the micro-amp reading through the flame rod?
8. Was this reading in range?
9. What is the purpose of the flame rod?

Click on the file below to download the Lab Assignment
- HET 130 Wk 7 Lab.docx (15.69 KB)