Review Flashcards
Ozone Depletion Potential
A measure of refrigerants ability to destroy the ozone
Global warming potential
The measure of refrigerants ability to add to global warming
CFCs ODP and GWP
ODP one GWP 10,900
How many ozone molecules can one chlorine Atom kill
100,000
What is a blend
Two or more refrigerants used together
Azeotropic
Blend of refrigerant that acts as one (has no temperature glide)
Azeotropic
Blend of refrigerant that acts as one
zeotropic
Blend of refrigerants that boil at different temperatures (individually)
Temperature glide
the range of boiling points or condensing points throughout the evaporator and condenser
Temperature glide
The difference between vapor and liquid State during evaporation and condensing
Type of oil in HFC
Poe (HYGROSCOPIC)
HCFC and CFC oil
AB or MO
What is hygroscopic
Holds and absorbs water
Type I
Small appliances 5 pounds of refrigerant or less
Type II
High & very high pressure refrigerant
Type II
High & very high pressure refrigerant
Type III
Low pressure systems (chillers)
What is Ozone made of
Three oxygen Atoms
Depletion of ozone causes
Skin cancer, crop lost, I disease, reduce marine life, increase ground-level zone
What else causes chlorine in the ozone
Volcanoes
What does CFC stand for
Chlorine fluorine carbon
What does HCFC stand for
Hydrogen chlorine fluorine carbon
What does HFC stand for
Hydrogen fluorine carbon
What is the cost per day for violating the EPA
$27,500
How much you get for snitching to the EPA
10 G’s niggah
Do you have to keep a log of refrigerant use
Yes
How should refrigeration systems be charged
As liquid into the high side
How should refrigeration systems be charged
As liquid
What is hygroscopic oil
Oil that easily absorbs water
How much of the vacuum should you pull for proper dehydration
500 µ
what is the purpose of the metering device
reduce pressure and saturation temp
what happens in the evaporator
heat is absorbed causing refrigerant to boil from liquid to vapor. the refrigerant vapor then travels to the inlet of the compressor
what happens in the compressor
refrigerant is compressed and moves to the inlet of the condenser
what happens in the condenser
high temperature high pressure vapor refrigerant expels its heat and the refrigerant condenses to a liquid. this high pressure liquid is then delivered to the metering device
you must be certified to service, maintain, and dispose appliances as of
Nov, 14, 1994
violation to vent CFC and HCFC as of
July 1, 1992
violation to vent HFC as of
Nov, 15, 1995
can you add nitrogen to a fully charged system
NO
CFC phased out as of
Dec 31, 1995
what is the montreal protocol
an international treaty regulating use of CFC HCFC etc
RECOVER
to remove refrigerant and store it in an external container
RECYCLE
to CLEAN refrigerant for reuse by separating iol and removing the moisture by passing it thru a filter drier
RECLAIM
restore refrigerant to VIRGIN by EPA standard to be resold
system dependent recovery device
assistance of appliance components to recover
self contained recovery device
own means of recovering
sale of refrigerants is restricted to licensed technicians as of
Nov 14 1994
can ester oils be mixed with other refrigerants
refrigerant oils can never be mixed together
ternary blend
3 part refrigerant blend
when there is a refrigerant leak from a blended refrigerant how will the leak happen
the different refrigerants will leak at uneven rates
systems that use class I and class II refrigerant require what
a service stub for easy recovery
what must be done if you discover a system has been charged with multiple refrigerants
they must be recovered into a separate tank
what must be done if you discover a system has been charged with multiple refrigerants
they must be recovered into a separate tank do not mix refrigerants
if nitrogen is used to flush debris out of a system can it be vented
yes
what will happen if a long hose is used to recover
large pressure drop, increased recovery time, potential for increased emissions
what is pressure temperature relationship have to do with recovery
lower ambient temp means slower recovery
how do you determine the general area of a leak
electronic or ultra sonic leak detector
how to find a leak when the general area is already known
bubble test
why do we pull vacuum or “dehydrate”
to remove water and moisture from the system
what can form if a system is not dehydrated
hydrochloric and hydrofloric acid
how to dehydrate a system
evacuate
can disposable cylinders be used to recover
NO
what is the fill limit of a recovery cylinder
80% of its capacity weight
recovery cylinders must be tested every
5 years
refillable cylinders must be ___ approved
DOT
if recovery cylinder has rust
reduce to 0 psi and discard
when charging with nitrogen always charge thru
pressure regulator
relief valves
must not be installed in series and must be replaced if there is signs of corrosion
scba is required if
large leak in confined area
scba is required if
large leak in confined area if not available vacate and ventilate the area
r22 and r12 turn into ____ if exposed to open flame or red hot metal
hydrochloric and hydrofluoric acid and phosphorus gas
cylinders must be ____ when shipped
in upright position and DOT tagged
recovery equipment used for small appliances manufactured before nov 15 1993 must be capable of removing __%
80% whether or not compressor is operating or achieve a 4” vacuum (ARI 740)
recovery equipment used for small appliances manufactured before nov 15 1993 must be capable of removing __%
80% whether or not compressor is operating or achieve a 4” vacuum (ARI 740)
recovery equipment used for small appliances manufactured after nov 15 1993 must be capable of
recovering 90% if compressor is operating 80% if not
or 4” vacuum (ARI 740)
small appliance leaks should be repaired when
whenever possible
small appliance leaks should be repaired when
not required butwhenever possible
small appliance leaks should be repaired when
not required but whenever possible
before recovering it is important to know
type of refrigerant in the system
air in a refrigeration system will cause what
higher discharge pressure
system dependent equipment captures refrigerant with
assistance of the appliance compressor, external heat source,or vacuum pump
when using a system dependent recovery device you should if the compressor works
run the compressor and recover from the high side
when recovering small appliances if the compressor does not run you should
access not high and low side of system, heat and tap compressor to release trapped refrigerant
make sure tanks do not have what in them
air
shops must have what to recover from systems with non working compressors
atlas one self contained recovery device
shops must have what to recover from systems with non working compressors
atleast one self contained recovery device
system dependent recovery devices can only be used on what type of appliances
appliances with 15lbs or refrigerant or less
what must be done to access fitting before recovering
leak check
what is an indication of a compressor burn out
strong odor during recovery
access fitting should not be _____
perminant
access fitting should not be _____
permanent
refrigerators built before 1950s may have
methyl formate, methyl chloride, or sulfur dioxide and should not be recovered with current devices
appliances used in RVs contain
water, ammonia, hydrogen, water and should not be recovered with current equipment
excessive super heat indication of (high pressure)
low charge and or leak
over 50 lbs charge (comfort cooling) must be repaired if over ___% annual leak
15%
over 50 lbs charge (commercial or industrial) must be repaired if over ___% annual leak
35%
what should be checked before using a recovery unit (II)
valve positions, oil level, evacuate and recover remaining refrigerant from receiver
using 134a requires what
its own set of gauges
what can be done to speed up recovery
pack cylinder in ice and apply heat to appliance
roof top units should be recovered by
liquid line entering the evaporator
evacuate empty cylinders before recovering
quick couplers self sealing hoses and hand valves should be used to minimize release of refrigerant
recovery equipment must be EPA certified as of
nov 15 1993
