Mid-Efficiency and High-Efficiency Gas-Fired Appliances 080206b Flashcards
What is the recommended spark gap for spark ignition?
1/8”
What is the process for direct spark ignition?
No pilot
This system turns on the main burner gas, lights the main burner and proves this flame instead of first proving a pilot
In regards to direct spark ignition, what can happen if the spark arcs to the main burner?
It will blow a hole in the main burner casting over time
What is a hot surface igniter made of?
Silicon carbide
Hot surface igniters can reach temperatures up to what temp?
2600°F
What is a second function of a hot surface igniter?
May be used to sense flame
When a hot surface igniter is used to prove flame, what happens over time and why was it a problem?
Over time, the igniter developes an oxide coating that is enough to impede the current flow proving flame. The igniter is too brittle to clean so flame rods were introduced
If a flame rod needs cleaning, what 2 materials are approved for use?
Scotch brite pads or 000 steel wool
What is a rectifier?
A device for converting alternating current to direct current
How much time is a hot surface igniter given for warm up time?
45 seconds
