Charging And Evacuation Tools

Question 1

Small valve opening, usually with a Schrader core valve, used for checking pressure

Answer 1

Access port

Question 2

Service valve position used for normal system operation

Answer 2

Back-seated

Question 3

An instrument used to measure both above and below atmospheric pressure

Answer 3

Compound gauge

Question 4

A service valve position where the valve stem has been turned just enough to lift the valve off the back seat.

Answer 4

Cracked open

Question 5

A high side service valve connected directly to a compressor at its outlet, considered a compressor service valve

Answer 5

Discharge service valve (DSV)

Question 6

Speed at which vapor is pumped through a vacuum pump, measured in common. Also called volume capacity.

Answer 6

Free air displacement

Question 7

A service valve position used to block the flow of refrigerant through the valve.

Answer 7

Front seated

Question 8

A relief valve that consists of a threaded plug with a metal core that melts at a much lower temp than the outer shell.

Answer 8

Fusible plug

Question 9

A liquid receiver service valve that is installed between the outlet of a liquid receiver and the liquid line.

Answer 9

King valve

Question 10

A high side service valve connected to the liquid line of a system, usually located closer to the condenser than the metering device.

Answer 10

Liquid line service valve

Question 11

A high side service valve located between the liquid receiver’s outlet and the liquid lines Inlet.

Answer 11

Liquid receiver service valve (LRSV)

Question 12

1 mm Hg = xxx microns

Answer 12

1000 microns

Question 13

A service valve position midway between front seated and back seated.

Answer 13

Mid position

Question 14

A device used to access HVACR systems that have no service ports or access ports.

Answer 14

Piercing valve

Question 15

A service device that is installed between the condenser and the Inlet of the liquid receiver.

Answer 15

Queen valve

Question 16

Processing a recovered refrigerant so that it is chemically pure.

Answer 16

Reclaiming

Question 17

Removing refrigerant from a system and storing it in an external container.

Answer 17

Recovering

Question 18

Cleaning a refrigerant for reuse by using filter drivers to separate out contaminants.

Answer 18

Recycling

Question 19

An extra spring built into pressure gauges to measure readings at higher pressures.

Answer 19

Retarder

Question 20

A low side service valve connected to the suction line of a system.

Answer 20

Suction line service valve

Question 21

A low side service valve connected directly to a compressor at its Inlet.

Answer 21

Suction service valve (SSV)

Question 22

An instrument for measuring pressures below atmospheric pressure

Answer 22

Vacuum gauge

Question 23

A device used to evacuate a refrigeration system of moisture and contaminants by creating a very low pressure inside the system.

Answer 23

Vacuum pump

Question 24

A small valve opening, usually with a Schrader valve core, that is used for checking pressure.

Answer 24

Access port.

Question 25

____ is formed from poor brazing procedures.

Answer 25

Black oxides

Question 26

2 inert gases that can be used to sweep or pressure test a system.

Answer 26

Nitrogen and carbon dioxide.

Question 27

Major causes of system leaks

Answer 27

Vibration and poor craftsmanship (bad flares or brazing)

Question 28

Low side pressure helps calculate. . .

Answer 28

Refrigerant temperature

Question 29

Balance point:

Answer 29

The rate the refrigerant gas changes to a liquid must equal the rate at which the gas enters the condenser

Question 30

Head pressure

Answer 30

Pressure on the high side of the system.

Question 31

5 symptoms of high head pressure:

Answer 31

Air in the system
Overcharge of refrigerant
Dirty condenser
Reduced air or water movement
High suction pressure