Charging And Evacuation Tools Flashcards
Small valve opening, usually with a Schrader core valve, used for checking pressure
Access port
Service valve position used for normal system operation
Back-seated
An instrument used to measure both above and below atmospheric pressure
Compound gauge
A service valve position where the valve stem has been turned just enough to lift the valve off the back seat.
Cracked open
A high side service valve connected directly to a compressor at its outlet, considered a compressor service valve
Discharge service valve (DSV)
Speed at which vapor is pumped through a vacuum pump, measured in common. Also called volume capacity.
Free air displacement
A service valve position used to block the flow of refrigerant through the valve.
Front seated
A relief valve that consists of a threaded plug with a metal core that melts at a much lower temp than the outer shell.
Fusible plug
A liquid receiver service valve that is installed between the outlet of a liquid receiver and the liquid line.
King valve
A high side service valve connected to the liquid line of a system, usually located closer to the condenser than the metering device.
Liquid line service valve
A high side service valve located between the liquid receiver’s outlet and the liquid lines Inlet.
Liquid receiver service valve (LRSV)
1 mm Hg = xxx microns
1000 microns
A service valve position midway between front seated and back seated.
Mid position
A device used to access HVACR systems that have no service ports or access ports.
Piercing valve
A service device that is installed between the condenser and the Inlet of the liquid receiver.
Queen valve
Processing a recovered refrigerant so that it is chemically pure.
Reclaiming
Removing refrigerant from a system and storing it in an external container.
Recovering
Cleaning a refrigerant for reuse by using filter drivers to separate out contaminants.
Recycling
An extra spring built into pressure gauges to measure readings at higher pressures.
Retarder
A low side service valve connected to the suction line of a system.
Suction line service valve
A low side service valve connected directly to a compressor at its Inlet.
Suction service valve (SSV)
An instrument for measuring pressures below atmospheric pressure
Vacuum gauge
A device used to evacuate a refrigeration system of moisture and contaminants by creating a very low pressure inside the system.
Vacuum pump
A small valve opening, usually with a Schrader valve core, that is used for checking pressure.
Access port.
____ is formed from poor brazing procedures.
Black oxides
2 inert gases that can be used to sweep or pressure test a system.
Nitrogen and carbon dioxide.
Major causes of system leaks
Vibration and poor craftsmanship (bad flares or brazing)
Low side pressure helps calculate. . .
Refrigerant temperature
Balance point:
The rate the refrigerant gas changes to a liquid must equal the rate at which the gas enters the condenser
Head pressure
Pressure on the high side of the system.
5 symptoms of high head pressure:
Air in the system
Overcharge of refrigerant
Dirty condenser
Reduced air or water movement
High suction pressure
