Hvac Ac105 Final Review

Front 1

What device terminates the defrost cycle at approximately 60 degrees Fahrenheit?

Back 1

Defrost thermostat

Front 2

What is the component responsible for protecting the compressor?

Back 2

Accumulator

Front 3

What component makes a heat pump unique?

Back 3

Reversing Valve

Front 4

In a heat pump when is the indoor coil a condenser

Back 4

Heating mode

Front 5

A heat pump is designed to produce ________ CFM per ton supply airflow.

Back 5

450

Front 6

If a technician connects gauges on the line set of the outdoor unit of a heat pump operating in the heat mode:

Back 6

High pressure gauge will read the high side pressure and low pressure gauge will most likely be in the retard.

Front 7

The permanent suction line is connected between:

Back 7

The compressor, accumulator and reversing valve.

Front 8

It is common for the outdoor unit to ice up when the heat pump is operated in the cooling mode. True or false?

Back 8

False

Front 9

When brazing a four-way reversing valve, heat absorbing paste should be placed around the body of the valve to minimize the chance of internal damage to the valve. True or false?

Back 9

True

Front 10

What term best describes the heat loss and gain in a building?

Back 10

Balance point

Front 11

What component allows the heat pump to change its cycle?

Back 11

Reversing valve

Front 12

On a 45-degree day, the suction pressure on a heat pump should read approximately_______psig.

Back 12

33 psig

Front 13

Auxiliary heaters are required when the heat loss is greater than the heat produced by the heat pump. True or false?

Back 13

True

Front 14

What device or devices allow a heat pump to go into defrost?

Back 14

Defrost clock/Defrost thermostat

Front 15

The auxiliary heater is only energized during defrost. True or false?

Back 15

False

Front 16

What control locks out the compressor and energizes the heat strips?

Back 16

Emergency heat switch

Front 17

When is The outdoor coil used as a condenser?

Back 17

Both B & C

Front 18

What prevents cold air from being circulated to the heated space during the defrost cycle?

Back 18

The auxiliary heater turns on to temper the air.

Front 19

The permanent discharge line is connected between?

Back 19

Compressor & Reversing Valve

Front 20

during operation, the compressor motor will rotate in the opposite direction to change the direction of refrigerant flow. True or false?

Back 20

False

Front 21

it technician goes on a heat pump service call and finds the compressor is extremely hot and the suction line is also hot. What is the problem?

Back 21

Reversing valve is leaking internally

Front 22

Scroll compressors need a crankcase heater. True or false?

Back 22

False

Front 23

A heat pump compressor is designed to:

Back 23

Have higher compression ratio

Front 24

In the heat mode, what device is necessary for proper operation?

Back 24

All the above

Front 25

What is the name of the large lines that connects the indoor and outdoor coils to the reversing valve?

Back 25

Hot gas line

Front 26

What metering device is the most efficient in a heat pump?

Back 26

TXV

Front 27

Where is the permanent discharge line located?

Back 27

Compressor to the reversing valve

Front 28

The small line that connects indoor unit to the outdoor unit is the liquid line. True or false?

Back 28

True

Front 29

What maximum ambient air temperature can a heat pump be ran in the heating mode?

Back 29

65 degrees

Front 30

In a heat pump, when is The outdoor coil in evaporator?

Back 30

Heat mode

Front 31

What device isolates electrical power from the control panel?

Back 31

Disconnect

Front 32

The best way to charge a heat pump is:

Back 32

By weight

Front 33

What can cause excessive heat and pressure in the heat mode?

Back 33

Failed indoor motor

Front 34

When working on a heat pump the most important thing to remember is:

Back 34

Safety

Front 35

The main piston in a four-way reversing valve is moved by pressure created by:

Back 35

Low and high side pressure difference.

Front 36

and the emergency heat mode, the auxiliary heat source becomes the primary heat source and the compressor is disabled. True or false?

Back 36

True

Front 37

In a heat pump, the indoor and outdoor coils are the same size. True or false?

Back 37

False

Front 38

Does ice on the outdoor coil cause:

Back 38

Both B & C

Front 39

Heat pump should only use by flow filter dryers. True or false?

Back 39

True

Front 40

What component is not normally used in a heat pump?

Back 40

High pressure control

Front 41

In the defrost mode, how is defrost initiated?

Back 41

Time and Temperature

Front 42

Which line that connects the indoor unit to the outdoor unit must be insulated?

Back 42

Hot gas line

Front 43

What type of filter for / dryer is installed in a heat pump following a compressor change out?

Back 43

Bi flow filter drier

Front 44

What is not one of the three zones of the condenser?

Back 44

Superheat zone

Front 45

What component is not unique to a heat pump?

Back 45

Liquid line

Front 46

A customer's heat pump is not heating. Where do you start first?

Back 46

Ask the customer questions

Front 47

What type of thermostat is used with a heat pump?

Back 47

Single stage cooling / 2 stage heating

Front 48

The reversing valve is de-energized during defrost. True or false?

Back 48

False

Front 49

What is the function of the crankcase heater?

Back 49

Both A and B

Front 50

During the heating mode the accumulator:

Back 50

Stores refrigerant not needed