Gas Furnaces
Ideal temp for indoor coil for A/C
40 degrees
Why did Carrier design the first "modern" A/C system?
Humidity
When fuel is burnt, it CAN produce this harmful gas
Carbon Monoxide
How would you engage heat strips on a heat pump from tstat?
High temp target or call AUX/Emergency heat
What voltage are most heat strips?
240V
If I have a high Delta T across the indoor coil, what is the most common cause?
Low airflow across coil (dirty coil, failing blower)
What year did Carrier stumble upon his "modern" design for A/C?
1902
Removes the flue gas from the heat exchanger chamber.
IDM (Draft)
Hypothetically, at what temp can you no longer extract heat from a source?
Absolute zero (-459*F)
What is the name of our tune-up process?
IMPACT
An abnormally high head pressure on your liquid line could indicate _________
Dirty outdoor coil
First President to enjoy A/C in the White House.
Herbert Hoover (1929)
How do you call for the reversing valve?
O or B
What temp/pressure state is the refrigerant in when it EXITS the compressor?
High temp, high pressure vapor
This ancient culture used wet reeds hanging in windows to help cool homes.
Egyptians
The manifold pressure of a NG fired furnace
3.5" w.c.
What are the two main components found in heat pumps (outdoor unit) that are not found in gas/electric systems?
Defrost board and reversing valve.
What is the one thing we do in our tune up to ensure we have no call backs?
Cycle the system
What test do you use to check if you have a possible low voltage line break?
Continuity
What did the term "tonnage" refer to originally in HVAC?
Ice (How long to melt one ton of ice, etc)