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System-dependent recovery equipment CANNOT be used when: ___________.
a) the appliance is leaking
b) the compressor of the appliance is operational
c) the ambient temperature is over 115 degrees F
d) the appliance contains over 15 pounds of refrigerant - ANSWERS-d) the appliance
contains over 15 pounds of refrigerant
While R-410A is a high-pressure refrigerant, it can be stored in the back of your service
van as long as: ____________.
a) the temperature inside the vehicle does not exceed 125 degrees F. This is the same
guidance given for R-22 and other common refrigerants
b) the temperature inside the vehicle does not exceed 125 degrees F, but R-22 can be
stored in vehicles with temperatures exceeding 125 degrees F
c) the temperature inside the vehicle does not exceed 1555 degrees F. This is the same
guidance given for R-22 and other common refrigerants
d) the temperature inside the vehicle does not exceed 155 degrees F, but R-22 can be
stored in vehicles with temperatures exceeding 155 degrees F - ANSWERS-a) the
temperature inside the vehicle does not exceed 125 degrees F. This is the same
guidance given for R-22 and other common refrigerants
,Which statement is NOT true about recycling and recovery equipment manufactured
after November 15, 1993?
a) It must be tested by an EPA-approved third party.
b) It must meet vacuum standards more stringent than those met by equipment
manufactured before November 15, 1993.
c) It must be equipped with low-loss fittings.
d) It must have an oil separator. - ANSWERS-d) It must have an oil separator.
Before using a recovery unit to remove a charge, what steps should be taken?
a) Check service valve.
b) Check the oil level in the recovery unit.
c) Evacuate recovery unit and recovery tank.
d) All of the above. - ANSWERS-d) All of the above.
When evacuating a system, the use of a large vacuum pump could: ________.
a) cause trapped oil to freeze
b) cause trapped refrigerant
c) cause trapped water to freeze
d) causes the valves to freeze - ANSWERS-c) cause trapped water to freeze
The backseating of a suction shutoff valve will close the: _______.
a) suction line and compressor port
b) compressor and gauge port
c) gauge port
d) compressor port - ANSWERS-c) gauge port
, The recovery of refrigerant from a system as a vapor only will minimize the loss of:
_____.
a) oil
b) water
c) refrigerant
d) all of the above - ANSWERS-a) oil
A reciprocating compressor should not be energized [when]: _________.
a) the discharge service valve is closed
b) the suction service valve is open
c) the discharge service valve is open
d) there is a demand for cooling - ANSWERS-a) the discharge service valve is closed
When a refrigerant trace gas becomes absolutely necessary, which of the available
refrigerants should be used to identify a leak?
a) CFC-12
b) HCFC-22
c) HFC-407C
d) HFC-410A - ANSWERS-b) HCFC-22
When charging an R-410A system that uses a water-cooled condenser, you must first
charge with vapor to a pressure of at least ______, before switching to liquid charging.
a) 20 psig
b) 120 psig