Orifice Flashcards
1
Q
When drilling an orifice how many sizes smaller should you drill
A
2
2
Q
What is the most common type of orifice
A
Fixed orifice
3
Q
What orifice is used on duel-fuel appliances where changes in fuel are frequent
A
Cap/universal orifice
4
Q
Altitude adjustments
A
Rating plate adjustments
Rating plate markings
Sea level=0’-1999’ elevation
Manufacturer de-rates appliance for high altitude by 10%
B-149.1-10 requires appliances installed over 4500’ be de-rated by an additional 4% every 1000’ elevation rise
5
Q
What does orifice DMS stand for on orifice size
A
Drill manufactures standard
