Oil Heat Finals Flashcards
How is the limit wired on a CAD cell control?
In series
This refers to the configuration of electrical components in a circuit.
When using the Bacharach smoke spot tester, how many times should you pump the tester?
10 times
The number of times to pump ensures accurate measurement of smoke density.
What is a good overfire draft measurement?
- 0.02 “ w.c.
This indicates a slight negative pressure in the combustion chamber.
How do you find Net Stack Temp?
Gross stack temp - ambient temp = Net stack temp
This calculation helps determine the efficiency of the heating system.
What two measurements are used to calculate the efficiency on a fuel oil burner system?
- CO2
- Net stack Temp
These measurements reflect combustion efficiency and heat loss.
What does BNO stand for?
Burner Not Operating
Indicates a safety or operational issue with the burner.
What are signs that there is too much primary air going to the burner?
- High CO2 reading
- High stack temp
Excessive primary air can lead to inefficient combustion.
What does it mean if we have a white smoky flame?
Too much primary air
A white smoky flame is indicative of incomplete combustion.
What should be checked first when the burner is locked out on safety?
Reset button
The reset button is often the first troubleshooting step in safety lockouts.
If you have voltage up to the black and white wires on a CAD cell, but no power at the orange and white wires, what would you check?
- Thermostat, see if it’s on reset
- Bad wire connections
- Check the relay
This troubleshooting process helps identify electrical issues in the system.
To check the voltage on a CAD cell control, where would you place your volt-meter leads?
Black & white wires
This is the standard method for checking voltage in CAD cell controls.
To check for voltage up to the stack control, where would you place your volt-meter leads?
Terminals 1 & 2
Ensures proper voltage is present for stack control operation.
During a normal cycle operation, when heat is sensed, what happens to the stack control contacts?
Hot closes and cold opens
This describes the behavior of contacts in response to temperature changes.
What is the spacing from the nozzle when adjusting the electrodes?
1/16 inches from end of nozzle
What is the overfire draft in most residential oil furnaces?
0.02 “ w.c.
Where is the fuel filter located?
Supply
What are the five combustion tests that are performed?
Draft, smoke, Net stack, Co2, and efficiency
On a CO2 test, if the percentage is above 13%, what should be adjusted?
Primary air
When completing annual burner maintenance cleaning, where should the technician start?
Start at the chimney. Top to bottom
If electrodes show signs of crazing, what should be done?
Replace electrodes
What fuel grade oil is most used in heating residential and light commercial buildings?
Red Diesel
When performing an efficiency test on an oil burner, what is the first measurement to be tested?
Net Stack Temperature
When completing combustion testing, what range should the CO2 reading be on an oil burning furnace?
9 - 13
When doing an efficiency test on an oil burner, you should let the unit operate for how long?
Minimum 5 minutes, 1 wide cycle
