CORE
What is the significance of an azeotropic mixture?
The mixture combines to act like a single-component refrigerant
CFCs are more likely to reach the stratosphere than other chlorine-containing compounds because _____________.
they are chemically very stable
Recovery equipment manufactured after November 15, 1993 that is used during the maintenance, service, or repair of small appliances must be certified by_________
an EPA-approved third party
In a high-pressure system, one indicator that there is a leak in the system is _______.
Excessive superheat
The component that changes a low-pressure vapor to a high-pressure vapor is the
compressor
HCFC refrigerants cause _______ damage to the stratospheric ozone layer in comparison to CFC refrigerants.
less
Positive evidence that CFCs are in the stratosphere comes from __________
measurements of CFCs in air samples taken from the stratosphere
is the process of removing water and water vapor (moisture) inside a system.
Dehydration
Hydrochlorofluorocarbon refrigerants contain_____________.
hydrogen, chlorine, fluorine, and carbon
A constant purging of a low-pressure unit is an indication of
A system leak
All persons opening appliances for maintenance, service or repair must have at least one piece of certified, self-contained recovery equipment available at their place of business. The only exception is for ___________.
small appliances
Technicians are certified to recover refrigerant during the maintenance, service, or repair of high-pressure equipment if they receive a passing grade on the...
Type II exam
Refillable cylinders are referred to as_________
Recovery Tanks
Since what date has it been illegal to knowingly release CFC and HCFC refrigerants during the service, maintenance, repair or disposal of appliances?
July 1, 1992
A refrigerant unit using an open compressor that has not been used for several months, is likely to leak from the
rotating shaft seal
________ requires chemical analysis of the refrigerant to verify that the ARI 700 Purity Specification are met.
Reclamation
Recovery devices that can capture liquid and/or vapor refrigerant without the assistance of components in the air conditioning or refrigeration equipment are known as ___________.
self-contained
The tendency of different components of blends to leak at different rates
Fractionation
_________ are controlled by the Montreal Protocol.
Chlorofluorocarbons, Hydrochlorofluorocarbons, and Halons
According to EPA; on low pressure chillers, moisture most frequently enters the system through air leaks in areas where there are
gaskets or fittings
________ recovery devices are so named because they depend on components of the system. That is, they capture refrigerant with the assistance of components in the air conditioning or refrigeration equipment they are emptying.
System-dependent
______________releases associated with good faith attempts to recapture and recycle or safely dispose of refrigerant substances shall not be subjected to the prohibition set forth in the Clean Air Act
De-minimis
In regard to refrigerants, B-3 indicates
toxic, high Flammability
ASHRAE is an anachronym for
American Society of Heating, Refrigerating and Air-Conditioning Engineers
Major repair is defined by EPA as a repair involving removal of the appliance compressor, condenser, evaporator, or
auxiliary heat exchanger coil