.
A. because the refrigerant vapor will slug the compressor
B. because the refrigerant vapor will flood the compressor
C. because the refrigerant vapor might overload the compressor
D. all of the above
A. pull a vacuum
B. pressurize the system with a trace gas mixture
C. pressurize the system with HCFC-22 and an inert gas, then check for leaks
D. pressurize the system with refrierant to psig
A. the lowest part of a system
B. the coolest part of a system
C. the evaporator
D. none of the above
A. a higher than normal superheat
B. a higher than normal subcooling
C. a lower than normal superheat
D. a lower than noraml subcooling
A. nothing as long as the next refrigerant is the same type, i.e. both CFCs or HCFCs ect.
B. recovery equipment must be used only with the same type of refrigerant
C. remove all of the first refrigerant from the unit before starting the next job
D. recover any remaining refrigerant from the unit before starting the next job
A. isolate most of the refrigerant in the reciver or storage tank
B. not have to recover the refrigerant if only a small amount will leak out because of your speedy repair
C. not have to remove the refrigerant if the repair is very small
D. all of the above
A. you must repair all leaking system
B. the leak does not have to be repaired if you have a written plan to replace the equipment within the next year
C. you only have to repair the leak if it exceeds 21 pounds each 12 months
D. you do not have to repair the leak
A. to see if there is going to be any more refrigerant released from the oil
B. so the pressures in the hoses will equalize so they are easier to remove
C. to enable the fittings to cool so that they will not burn your fingers
D. to check for leaks
A. one designed by a manufacturer for use with only one type of system
B. one that is permanently attatched to the system
C. one that relise on a compressor in the appliance for recovery
D. none of the above
A. through the low-side, if the system is off
B. through the high-side, if the system is in a vacuum
C. if the cylinder can be heated
D. all of the above
A. will strave the compressor of oil
B. will cause it to trip on low head pressure
C. can cause a hydrostatic lock and bent rod
D. may rupture the refrigerant hose
A. soap bubbles
B. halite torch
C. A&B
D. electronic leak detector
A. 60 days
B. 24 hours
C. 25 days
D. 30 days
A. R-502
B. R-22
C. R-12
D. all of the above
A. system trash
B. acid
C. oil
D. all of the above
A. change the oil in the recovery unit compressor
B. clean the coils and metering device with R-11
C. recycle the refrigerant back into the repaired unit
D. blow out the system with compressed air
A. destroyed
B. reused in equipment owned by the same person
C. recycled in the same equipment
D. all of the above
A. is not acidic
B. has had the oil trapped seperatly
C. does not have moisture trapped in it
D. does not have to pass through the recovery unit compressor
A. remove acid
B. remove moisture
C. remove contaminated oil
D. all of the above
A. 15 inches of Hg vacuum
B. 10 inches of Hg vacuum
C. 4 inches of Hg vacuum
D. 0 inches of Hg vacuum
A. moisture in the refrigerant
B. a change in temperature
C. refrigerant boiling out
D. acid in the refrigerant
A. under a high pressure
B. subcooled
C. saturated
D. superheated
A. superheated vapor
B. no oil
C. very little liquid
D. subcooled refrigerant
A. 14.7 psig
B. 0 psig
C. 29.4 inches of Hg
D. 14.7 inches of Hg
A. 0 psig
B. 4 inches of Hg vacuum
C. 29 inches of Hg vacuum
D. 15 inches of Hg vacuum