Air conditioning and heat pump Flashcards
1
Q
How much tonnage do you need in southern us
A
450-700 sq ft per ton
2
Q
How much tonnage do you need in northern us
A
700-1000 sq ft per ton. 8 ft ceilings
3
Q
What is the standard temperature difference (ΔT) between supply and return air in a properly functioning A/C system?
A
14–22°F.
4
Q
What type of refrigerant is commonly used in newer HVAC systems?
A
R-410A (replaces R-22, which is being phased out).
5
Q
What is the purpose of a heat exchanger in a furnace?
A
To transfer heat from combustion gases to air without mixing the two.
6
Q
: What is a common cause of short cycling in an HVAC system?
A
Dirty air filter, oversized unit, or thermostat issues.
7
Q
A
