A combustion air proving switch
a) senses O2 content of the air
b) senses flue gas pressure
c) detects O2 in flue gas
d) senses windbox pressure
e) senses air temperature
Answer: D
A combustion air proving switch
a) senses O2 content of the air
b) senses flue gas pressure
c) detects O2 in flue gas
d) senses windbox pressure
e) senses air temperature
Answer: D