EPA Core
The low-side test-pressure data-plate value should be used by a technician to determine a safe pressure for
Leak testing
These appliances typically have less than 5 pounds of refrigerant charge and are hermetically sealed at the factory.
What are small appliances?
This component is used to trap solid contaminates and remove moisture from a system.
What is a filter-drier?
Pressure relief valves are typically set for this pressure and are vented to the outdoors.
What is 15 psig?
A full 50 pound cylinder will have this much refrigerant in it.
What is 40 pounds or 80%
This refrigerant, a near azeotropic 50/50 blend of HFC-32 and HFC-125 replaced HCFC-22
What is HFC-410A
This test consists of allowing a refrigerant to stabilize for at least 12 hours then compare pressure and temperature to a chart.
What is testing for non-condensibles?
Oil on the outside of tubing is an indication of this condition.
What is a refrigerant leak?
low pressure equipment operates below atmospheric pressure. to eliminate any air in the system due to leaks this device is used.
What is a purge unit?
Where is the purge unit located in a low-pressure system?
The top of the condenser.
These refrigerant blends act as a single compound refrigerant and do not fractionate.
What are Azeotropes
This is another term for a recovery device that does not have its own compressor, uses a non-pressurized container and is dependent on system pressure for recovery
What is passive recovery
On equipment with more than 50 pounds of charge, this person is responsible of reporting to EPA any efforts of identifying leaks, leak inspection/repair reports and keep these records for 3 years.
What is Owner/operators?
What can be used to pressurize a chiller system before opening the system for a non-major repair?
Controlled Hot Water
What ASHRAE Class is R-600A ?
A3 Refrigerant- Highly Flammable
These refrigerant blends consist of 3 different refrigerant compounds and may or may not fractionate.
What are ternary blends
Refrigerant being heavier than air displaces oxygen and can lead to this condition especially in enclosed spaces.
What is suffocation or asphyxiation?
This recovery method is only usable if the appliance has less than 15 pounds of charge.
What is Passive or System dependent?
Recovery units high pressure cut out must be set for this pressure when being used for type 3 recovery.
What is 10 psig?
This new class of refrigerant is added for refrigerants that have low flammability.
What is A2L
These four main components that make up the basic refrigeration cycle
What are the Compressor, Condenser, Metering device and Evaporator?
These recovery requirements are for both passive and active systems and with a non-working compressor
What is 4 inches Hg or 80% ?
This method of refrigerant recovery is the fastest but has a drawback of potential loss of refrigerant oil.
What is liquid recovery?
Where is refrigerant added to a low-pressure system during the charging process
The lowest access point on the system such as the evaporator charging valve
When pressurizing a low-pressure system for leak-detection purposes, do not exceed
10 PSIG !