EPA 608 SIMPLIFIED REVISION SUMMARY COMPILED WITH EXPECTED EXAM QUESTIONS AND THEIR ANSWERS
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EPA 608
Instelling
EPA 608
Asphyxia
The displacement of oxygen in a room by the denser refrigerant.
Azeotrope
A blend of two or more components whose equilibrium vapor phase and liquid phase composition are the same at a given pressure. These refrigerants are given a 500-series ASHRAE designation and behave like a single ...
asphyxia the displacement of oxygen in a room by t
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EPA 608 SIMPLIFIED REVISION
SUMMARY COMPILED WITH EXPECTED
EXAM QUESTIONS AND THEIR
ANSWERS
Asphyxia
The displacement of oxygen in a room by the denser
refrigerant.
Azeotrope
A blend of two or more components whose equilibrium
vapor phase and liquid phase composition are the same at
a given pressure. These refrigerants are given a 500-
series ASHRAE designation and behave like a single
refrigerant. They can be charged as a liquid or vapor.
Bubble Point
The temperature at which the non-azeotropic blend first
begins to evaporate (boil).
Capillary Tube
A passive throttling device comprised of a very small
diameter long tube located upstream of the evaporator
that drops the pressure in the system, causing refrigerant
to flash into a two- phase mixture. It does not actively
control the pressure drop to maintain a prescribed
superheat at the exit of the evaporator.
Appliance
Any device that contains and uses a refrigerant for
household or commercial purposes, including any air
,conditioner, refrigerant, chiller, or freezer. EPA interprets
this definition to include all air-conditioning and
refrigeration equipment except units designed and uses
exclusively for military purposes.
Class I Refrigerant
Refrigerant that have an ozone depletion potential (ODP)
greater than 0.2, and consist of all chlorofluorocarbons
(CFCs).
Class II Refrigerant
Refrigerants that have an ozone depletion potential (ODP)
of less than 0.2 and consist of all
hydrochlorofluorocarbons (HCFCs).
Commercial Refrigeration
Refrigerant appliances used in retail food and cold storage
warehouse sectors. "Retail food" includes the refrigeration
equipment found I. Supermarkets, convenience stores,
restaurants, and other food services establishments. "Cold
storage" includes the equipment used to store meat,
produce, fairly products, and other perishable goods. All of
this type of equipment contains large refrigerant charges,
typically more than 75 pounds.
Compound
A substance formed by a union of two or more elements in
a definite proportion by weight.
Dehydrate
to remove water from the system.
Deep vacuum
The evacuation of a system down to a low vacuum,
typically below 500microns, with the goal of removing non-
condensable gases as well as evaporating and removing
water from the system.
,Dew Point
The temperature at which the non-azeotropic blend first
begins to condense.
Disposal
The process leading to and including and of the following
- the discharging, depositing, dumping, or placing of any
discarded appliance into land or water.
- the disassembly of any appliance for discharging,
depositing, dumbing, or placing of it's discarded
component parts into or on any land or water.
- The disassembly of any appliance for reuse of its
components parts.
Electronic Vacuum Gauge or Micron Gauge
An electronic vacuum gauge that displays the vacuum
level directly in microns and is the only accurate field
method to determine the evacuation level of a deep
vacuum.
Evacuation
The process of extracting any air, non-condensable gases,
or water from the system and thereby reducing the
pressure to some value below 0 psig.
EXV
the abbreviation for an Electronic Expansion Valve, a
throttling device located upstream of the evaporator, that
actively controls the pressure drop ( via electrical feedback
from a temperature sensor) to maintain a prescribed
superheat at the exit of the evaporator.
Fractionation
The separation of a liquid mixture into a separate parts by
the preferential evaporation of the more volatile
component.
, Halocarbon
A halogenated hydrocarbon containing one or more of the
three halogens: fluorine, chlorine, and bromine. Hydrogen
may or may not be present.
High-pressure appliance
An appliance that uses a refrigerant with a liquid phase
saturation pressure between 170 psia and 355 psia at 104
F. This definition includes but is not limited to appliances
using R-401 A, R-409 A, R-401B, R-22, R-411B, R-502,
R-402B, R-408A, R-410A, and R-402A
Hydrocarbon
A compound containing only the elements hydrogen and
carbon.
Hygroscopic
An affinity for water, so hygroscopic oils are oils that
readily absorb moisture.
Industrial Process Refrigeration
Complex customized appliances used in the chemical,
pharmaceutical, petrochemical industries, and in
manufacturing. The sector includes industrial ice machines
and ice rinks.
Isomer
One of a group of substances having the same
combination of elements but arranged spatially in different
ways.
King Value
A combination shut-off and service value typically used on
the inlet and outlet of a compressor, and on the inlet and
outlet of a packaged condensing units.
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