1010 Final Flashcards
Enlarging one end of copper tubing so that another piece of the same size will fit inside
Swaging
This tool is used to open and close a service valve
Service wrench
Place the service valve in this position for a gauge reading
Cracked
Color code for HCFC 22
Green
A mixture of refrigerants that has its own refrigerant properties
Azeotrope
Color code for CFC 12
White
Approximate melting point (solidus) of 95/five solder
+450 F
This component rejects heat in the refrigeration cycle
Condenser
Place the service valve in this position to remove the gauge hose
Back seated
Color code for HFC 134a
Light blue
Place the service valves in this position to isolate the compressor
Front seated
This component absorbs heat in the refrigeration cycle
Evaporator
This component is used to meter the flow of refrigerant
TEV or TXV
This component pumps the refrigerant vapor thru a refrigeration system
Compressor
This component holds excess refrigerant in a refrigeration system
Receiver
These two tools can be used to bend soft copper tubing
Lever type and spring type
The approximate melting point of a 15% silver brazing rod
1200 F
This causes solder to be pulled into a “tight” joint
Capillary action
This component is used to control the delivery pressure from oxygen, nitrogen, and acetylene tanks
Regulator
This is the most sensitive leak detector
Electronic
The approximate boiling temperature of R-12 at atmospheric pressure
-21.6
The approximate boiling temperature of R-22 at atmospheric pressure
-41.4
The approximate boiling temperature of R-502 at atmospheric pressure
-50.1
The approximate boiling temperature of R-11 at atmospheric pressure
+74.8
This leak detector is difficult to use outside on bright sunlight or windy conditions
Halide torch
The term used when a vacuum pump is used to remove non-condensables from a refrigeration system
Evacuate
To read operating pressures, the gauge manifold handles should be
Closed
Refrigeration copper tubing is sized by
Outside diameter (OD)
List five desirable characteristics of refrigerant
Colorless, odorless, non toxic, non flammable, and non corrosive
What classification or type of copper tubing is required in refrigeration and air conditioning applications
K and L
Why is necessary to seal the ends of copper tubing when it is not in use
Keep out non condensables
Name five methods used to join or connect copper tubing
Swage, flare, pinch, constriction, manufactured fitting
What is the term used to describe the drawing of solder into a close fitting joint
Capillary action
Oxygen is usually set to a higher delivery pressure than acetylene when operating a torch
True
No danger will result when oxygen and oil are present under pressure
False
How can copper oxide be eliminated from the inner walls of copper tubing joint when brazing
Nitrogen
What material is used to help soft solder stick to copper
Flux
When would a flare connection be preferred to a solder connection
When easy disassembly is needed
What is the approximate melting point of 95/5 solder
+450 F
What is the approximate melting point of 15% silver braze
+1200 F
What is the metal content of 95/5 solder
95% tin / 5% antimony
