Air Conditioners Flashcards
What are the three types of air conditioners
Evaporator cooler
Compressor type
Heat pump
4 functions of an evaporative cooler?
Lowers air temp
Filters the air
Circulates the air
Humidifies the air
What are the 4 functions of a compressor type AC
Lowers temp
Filters air
Circulates air
De-Humidifies air
What may some evaporator coolers need in addition to power?
Some will need a 1/4” water line from the pump
What are the 5 types of energy
Radian Chemical Mechanical Nuclear Electrical Heat or thermal energy
What is thermal energy?
And what are the two different kinds?
The energy that produces molecular motion
Sensible heat
Latent heat
What is sensible heat?
Heat that creates a change in temp without causing a change in state
Heat that can be sensed or felt
What is latent heat?
Heat that causes a change in state without changing then temp
Which type of heat does a thermostat measure
Sensible heat
What are 5 types of latent heat?
Fusion Freezing Vaporization Condensation Sublimation
What is temperature?
It’s the measurement of the intensity of heat
What it BTUs
British thermal units
The amount of heat it takes to raise or lower one pound of water, one Fahrenheit degree at sea level
What are 3 methods of heat transfer?
Conduction
Radiation
Convection
What is conduction?
The flow of heat through direct contact
What is radiation
The flow of heat without direct contact
What is convection
Heat transfer due to temp differential
Eg. Opening the door
What are the two types or refrigerant
Which one is currently being used
R22
R410A is currently used
How many ohms does the domestic heat pump reversing valve use?
Old?
New?
Old style 465 ohms
New style 265 ohms
+/- 10%
Domestic heat pump will operate till what temp?
0•c (32f)
What will the domestic heat pump do if it’s below 40F
It will cycle defrost every 25 min
What are 4 causes of restricted ducting?
Collapsed ducts
Restricted duct entry
Separated duct work
Improper louver installation
What are 5 common reasons why an AC would leak water
Collapsed gasket Loose mounting bolts Plugged evaporator drain holes Gasket not covering old vent holes Cracked AC base pan
What are some possible fan motor maintenance
Some can be oiled with 3-4 drops
What is the most common cause of frost build-ups
Reduced airflow
What must the A/C circuit have for an A/C
Must have a dedicated circuit breaker
What must you do before opening or disposing of the system
But be evacuated down to 0psi
How long must you run the AC before checking delta temp
Half hour
What conditions are the amps for on the data plate?
What must you do if it is different temperatures?
95F outdoors
80F indoors
50% humidity
Must raise or lower 1 amp for every 5F
How do you reset a 5 button thermostat and what will come on the screen when complete?
Hold mode and zone, then turn on.
FF will appear on the screen
