Deck 46: Room Air Conditioners

Question 1

A heat-pump-style room air conditioner has all the major components of a cooling-only unit with the addition of a ____.

A) 3-way valve
B) 4-way valve
C) quarter-turn valve
D) line-tap valve

Answer 1

B

Question 2

Electrical service for a room unit may also involve the thermostat and the power cord.

Answer 2

True

Question 3

The round piece fastened to the outer tips of the condenser fan blade is called the ____.

A) blade brace
B) dip ring
C) air spreader
D) slinger ring

Answer 3

D

Question 4

Combination cooling and heating units may include electric strip heaters or be of the heat-pump style.

Question 5

The addition of a window air conditioner of ____ size may overload a circuit.

A) medium
B) any
C) small
D) large

Question 6

The window unit must be installed in such a manner that air can circulate across the ____ and not recirculate or high head pressures will result.

A) condenser
B) evaporator
C) compressor
D) metering device

Question 7

When servicing an R-410A window air conditioner, adjust the airflow across the condenser until the head pressure reaches ____.

A) 360 psig
B) 400 psig
C) 420 psig
D) 460 psig

Question 8

Cooling-only window air conditioners range in size from about 4,000 Btu/h to 24,000 Btu/h.

Question 9

If a window air conditioner is installed with an inward pitch, the condensate could leak into the room.

Question 10

Cooling-only room air conditioners are marketed in ____ Btu/h capacities.

A) 1,000 to 15,000
B) 3,000 to 20,000
C) 4,000 to 24,000
D) 5,000 to 30,000

Question 11

To ensure correct direction of refrigerant flow in heat-pump-style room air conditioners, ____ are included in the unit.

A) filter drivers
B) globe valves
C) quarter-turn valves
D) check valves

Question 12

The most common refrigerant used in older room air conditioners is ____.

A) R-12
B) R-22
C) R-410A
D) R-500

Question 13

The evaporator of a window air conditioner should operate ____.

A) far below freezing temperature
B) far above freezing temperature
C) just above freezing temperature
D) at 15°F

Question 14

The compressor for room units is a typical hermetically sealed air-conditioning compressor.

Question 15

The most common refrigerant used in newly manufactured room air conditioners is ____.

A) R-12
B) R-22
C) R-500
D) R-410A

Question 16

The condensate off the evaporator coil in a room air conditioner is generally disposed of by ____.

A) draining to the outside soil
B) piping to a storm drain
C) draining to the slinger system of the fan
D) draining to a holding tank

Question 17

All 230-V power supplies use the same style plug.

Question 18

The evaporator typically operates _____ the dew point temperature of the room air.

A) much lower than
B) much higher than
C) below
D) above

Question 19

Heat exchange between the capillary tube and the suction line is typically found on window air conditioners.

Question 20

The term used to reference the assembly of all the components that make up the air-conditioning system is ____.

A) casement
B) sleeve
C) chassis
D) wrap-around

Question 21

The thermostat for room units is usually mounted with the control knob in the control center and the remote bulb in the vicinity of the return air.

Question 22

How many air moving motors do cooling-only room air conditioners usually have?

Question 23

Central air conditioning systems operate with a design evaporator saturation temperature of about ____________________ºF.

Question 24

What are the two advantages of draining the condensed moisture to the slinger system on the condenser?

Question 25

The metering device in a modern room air conditioner is a(n) ____________________.

Question 26

Some cooling-only window air conditioners are equipped with energy-saver switches. What is their purpose?

Question 27

In a heat-pump-style room air conditioner in the heating cycle, the indoor coil acts as the ____________________.

Question 28

Where is the thermostat's sensing bulb located on a window air conditioner?

Question 29

Why may the window unit installation be considered temporary and the through-the-wall unit considered permanent?

Question 30

Why do room air conditioners ice up easier than central air-conditioning systems?

Question 31

An extremely dirty air filter can cause the window air conditioner to operate at low suction pressures.

Question 32

What are some of the concerns with the heat-pump-style room air conditioner?

Question 33

Window installation of room units are for either double-hung or ____________________ windows.

Question 34

In a heat-pump room air conditioner in the cooling cycle, the indoor coil acts as the ____________________.