Air condition Flashcards
List 6 common evaporator problems.
- no access to coil
- dirty
- frost
- top of evaporator dry
- corrosion腐蚀
- damage
Oversized distribution分布 ductwork is a common problem with central air conditioning? True or False
False
An undersized air conditioner is better than an oversized one. True or False?
T
The typical temperature drop from outdoors to indoors with a properly operating air conditioning system would be about 15 degrees? True or False
T
What kind of temperature drop would you expect to find in the house air as it passes over the evaporator coil?
15-20
A compressor can be thought of as a pump? True or False
T
What is the function of a sump or crankcase heater?
It keeps the oil at the base of the compressor warm enough to boil off the refrigerant
List eight common compressor problems
- Excessive过度 noise/vibration震动
- Short cycling or running continuously
- Out of level
- Wrong fuse or breaker size
- Electric wires too small
- Missing electrical shut off
- Inoperative不工作
- Inadequate不足 cooling
The condenser coil in a split system is typically located________?
Outdoors
List three common configurations of evaporator coils
- A coil
- Slab Coil
- Vertical coil
Evaporator coils should be upstream of furnace heat exchangers. True or False.
False
In one sentence describe描述 the function of a capillary毛细管 tube
The capillary tube acts as an obstruction障碍物 in the line, reducing减少 the pressure and temperature of the liquid refrigerant制冷剂
In one sentence, describe描述 the function of a thermostatic恒温 valve.
A TXV, or TEV acts as a more precise精确的 expansion device on larger air conditioners调节器 or heat pumps.
List 4 common expansion device problems.
- capillary tube defect
- thermostatic expansion valve connections loose
- clogged orifice孔
- expansion valve 黏贴
List 7 possible causes of leaking condensate drip pans
- The pan may be cracked, or have an open seam in it
- The opening to the drain line may be obstructed堵塞
- The drain line may be missing or disconnected
- The pan may not be sloped properly allowing water to overflow rather than run to the drain
- The pan may be rusted through
- The pan may not be properly located below the coil
- The pan may be filled with debris碎片, restricting限制 the amount of water it can hold
When is an auxiliary辅助的 condensate冷凝 drain pan needed?
When the evaporator coil is located in an attic or anywhere over a finished living space.
What are condensate drain lines usually made of?
plastic or copper
Do condensate drain lines ever have a trap?
Condensate lines from the primary pan may or may not have a trap. Lines from secondary pans should never be trapped.
What is the purpose of a trap on a condensate drain line?
- The trap may be required if the condensate pan is upstream of the house air fan because the water is under negative pressure
- If the condensate is allowed directly into waste plumbing, a trap is required
List two acceptable discharge points for condensate drain lines and one generally unacceptable discharge point
Acceptable
- Outside the building directly into the ground
- Near the basement floor drain (must be an air gap)
Unacceptable
- Into the granular fill beneath the basement floor slab
- Into the waste plumbing stack