ITAZ RQ: Air Conditioning and Heat Pumps Flashcards
How many square feet can one ton of air conditioning cool in Florida?
450-700 SF
How many square feet can one ton of air conditioning cool in Michigan?
700-1000 SF
Oversized air conditioner is better than an oversized one. (True or False)
False
An undersized conditioner is better than an oversized one. (True or False)
True
The typical temperature drop from outdoors to indoors with a properly operating air conditioning system would be about 15°F.
True
What kind of temperature drop would you expect to find in the house air as it passes over the evaporator coil?
15-20°F
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 refrigeran
List eight compressor problems.
Excessive noise/vibration Short cycling or running continuously Out of level Wrong fuse or breaker size Electric wires too small Missing electrical shut off Inoperative Inadequate cooling
The condenser coil in a split system is typically located…
Outdoors
The evaporator coil in a split system is typically located…
Indoors (above the furnace)
The condenser fan in a split system is located…
Outdoors
List four condenser problems.
Dirty
Damaged
Corrosion
Dryer or water heater exhaust too close
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 the function of a capillary tube.
The capillary tube acts as an obstruction in the line, reducing the pressure and temperature of the liquid refrigerant
List two acceptable discharge points for condensate drain lines and one generally unacceptable discharge point.
Acceptable:
Unacceptable:
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
Refrigerant lines are usually made of:
Copper
List five common refrigerant line problems.
Leaking Damage Missing insulation Lines too warm or cold Lines touching each other
How would you normally identify a leak in a refrigerant line visually?
This may be identified by an oil residue below the line set, typically at valves or coil connections
Which line should be cool when the system is operating?
Suction line
Where is the evaporator fan typically located in a split system?
Indoors
The amount of air that must cross an evaporator coil in a heating climate is less than the amount of air that must cross a conventional furnace heat exchanger coil. (True or False)
False
List seven common evaporator fan problems.
Undersized blower or motor Misadjustment of belt or pulley Excessive noise/vibration Dirty or missing filter Inoperative Corrosion/damage Dirty fan
List eight common duct problems on cooling systems.
Undersized or incomplete Supply and return register problems Dirty Disconnected and leaking Obstructed or collapsed Poor support Poor balance Humidifier damper missing
High level returns are more appropriate for heating than cooling. (True or False)
False
Ducts passing through unconditioned spaces such as attics or crawlspaces should be ________.
Insulated with appropriate vapor barriers
You should not operate the heat pump in the heating mode when the outdoor temperature is above ______.
65°
You should not operate the heat pump in the cooling mode when the outdoor temperature is below…
65°
List nine ways ways of visually determining that a system is a heat pump, rather than an air conditioner.
Data plate may say “HP” or “Heat Pump”
Thermostat has an emergency heat setting
Both freon lines are insulated
Presence of a reversing valve
Compressor is indoors and its an air-to-air system
Presence of an outdoor thermostat connected to control wiring
If it is winter and the unit is operating, its a heat pump
You find two-stage thermostat
You find two expansion devices
List four poor locations for the outdoor coil of a heat pump.
With restricted intake or discharge air flows
Within 6 feet of a clothes dryer, water heater vent or high efficiency furnace vent
Under the drip line of the roof
Below snow drift depth or with no provision for condensate to drain away freely
