[ILM] 102I Flashcards
R-717 is
ammonia
R-744 is
carbon dioxide
R-764 is
sulphur dioxide
R-40 is
methyl chloride
R-290 is
propane
Azeotropes
Zeotropes
1 mixture
2+ mixtures
Chlorofluorocarbon (CFC)
contains chlorine and fluorine
Hydrochlorofluorocarbon (HCFC)
contains chlorin, fluorine and hydrogen
Hydrofluorocarbon (HFC)
contains fluorine and hydrogen
Zeotropic refrigerants are in the
400 series
Azeotropic refrigerants are in the
500 series
CFC refrigerants depletes the earth’s ozone layer, they are banned from use in new systems or in recharging old refrigerant systems
T or F
True
as of 2020, _____ cannot be used in recharging old refrigerant systems
HCFC refrigerants
Halocarbon refrigerants are non-flammable, but break down chemically in a flame
T or F
True
The Montreal Protocol, established in
1987, and provided phase-out schedules for ozone-depleting substances
Refrigeration oils
they use synthetic oils now and they are called polyolester oils
more expensive than mineral oils
polyolester oil
highly hygroscopic, it has a significantly strong attraction for water
should not remain exposed to the atmosphere for more than 5 minutes
Low toxicity (Class A)
is equal to and above 400 parts per million (ppm)
High toxicity (Class B)
is equal to and below 399 part per million (ppm)
Cylinder Type
R-134a
R-22
R-404A
R-410A
R-507
R-717 (ammonia)
Colour Code
Light sky blue
Light green
Orange
Rose
Blue green (teal)
Silver
Refrigerant recovery cylinders have a
yellow top and gray body
cannot exceed 300lb
Cylinders for flammable refrigerants have a red band on the top
T or F
True
always transport and store cylinders in an upright & secure mode
True
Never exceed the liquid water weight capacity by more than
80% at 70F
or
60% at 125F (max limit)
the temperature inside service trucks can exceed 125F on summer days
True
liquid recovery
The quickest method of recovery and it does not remove the vaporous refrigerant. Vapour removal method is necessary after the liquid removal
vapour recovery
the slowest method of recovery
A refrigeration system should contain at least 20lb of refrigerant for the push-pull recovery method to work effectively
True
you must report leaks that exceed _____ to the Alberta Environment
10kg (22lb)
Always replace the vacuum pump’s oil
prior to each evacuation
connecting the vacuum pump to both the high and low sides of a system reduces the evacuation time
True
There are _____ microns in an inch
760,000
