thermodynamics
How does heat travel?
Warmer body to a cooler body.
Type of flue vent for 80% furnace?
Type B double wall metal
what type of material does the 90% furnace have for flue vent?
PVC
What is the job of the inducer motor?
to help the flue gases escape the heat exchanger.
since they can't do it on its own?
when pressure goes up?
Temperature goes up.
3 ways heat travels?
Conduction
convection
Radiation
what category is 80% induced draft furnace?
Category I
what does the 90% furnace need to be installed? that the 80% furnace does not?
Drain lines! for the condensing flue gases
what is the job of the pressure switch?
to ensure the inducer motor is operating, and the flue gases has a proper flow.
specific gravity of
air
Propane
Natural Gas
1
1.5
.5
what is Temperature?
Molecules in motion.
80% furnace cannot be in the 90% range because it doesn't have?
recuperative coil
what is the temp and pressure of the 90%?
Low temp 90 -100
Positive pressure vent
what is the job of the Flame sensor?
to prove the gases are ignited by making a voltage back to circuit board.
Air and water are both?
Fluids!
they both deform and can both me mover by pressure.
3 laws of thermodynamics?
created nor distroyed
From warmer body to cooler body
hot air rises cold air drops
What is the Temperature range of the flue gases?
Range from 350 - 450
what is the temperature split range on 90% warm air furnace?
40-60
what type of burner are used in 80% 90% furnaces
to insure a proper blue flame?
atmospheric
Inshot burners.
what is the clearance volume for the flue pipes on a 90% and 60% furnace?
0 clearance for the 90
1" inch for 80%
is molecules in substance A is at a temp of 90 degrees and substance B is at a temperature of 100 degrees witch way is heat moving?
from substance B to substance A
what type of pressure is the 80% flue gases?
high temp Negative pressure vent
what is the other pipe that should be installed with the flue pipe for the 90% furnaces to maximize effencency?
make up air
(aka)
Fresh air intake...
What is the job of the heat exchanger?
To Separate the combustion gases from circulating air While transferring heat from the combustion gases from the circulating air!!
in hydronics:
when pressure increases ?
Flow decreases