Row 1
What is the primary water source for a recovery unit condensing coil?
local municipal water supply
Recovering refrigerant from a system in vapor phase will minimize loss of what?
Oil
In order to recover liquid refrigerant, you must connect one hose to the system's what?
Liquid line
During evacuation with large amounts of moisture it may be necessary to increase pressure to counteract freezing with gas such as what?
Nitrogen
A moisture-indicating sight glass is useful for what?
checking the refrigerant's moisture content
In a refrigeration system utilizing a thermal expansion valve, the component directly following the condenser is what?
receiver
When a new system has been assembled (built up), and it is ready for testing, the first thing to do is what?
pressurize with an inert gas and leak check
When first inspecting a hermetic system known to be leaking, you should look for what?
traces of oil
Which is an indicator of a leak in a high pressure system?
excessive superheat
Pressure relief valves must not be installed in what way?
in a series
Gauge set hoses used for field service work should have self-sealing connectors or hand valves in order to what?
minimize refrigerant release when hoses are connected and disconnected
Recycling or recovery equipment using hermetic compressors has the potential to overheat when drawing deep vacuums because what?
the motor relies on the flow of refrigerant through the compressor for cooling
System-dependent recovery equipment CANNOT be used when...?
the appliance contains over 15 pounds of refrigerant
When using recovery and recycling equipment manufactured AFTER November 15, 1993, technicians must evacuate an appliance component containing more than 200 pounds of CFC-12 to what level before making a major repair?
15 inches of Hg vacuum
When using recovery and recycling equipment manufactured BEFORE November 15, 1993, technicians must evacuate an appliance containing 10 pounds of CFC-500 to what level before disposing of the appliance?
4 inches of Hg vacuum
Appliances containing CFC refrigerants can be evacuated to atmospheric pressure when?
leaks in the appliance make evacuation to the prescribed level unattainable
After reaching the required recovery vacuum on an appliance, you should do what?
wait for at least a few minutes to see if the system pressure rises, indicating that there is still refrigerant in liquid form or in the oil
Give an example from the test of a "major" repair under EPA's regulations.
replacement of an evaporator coil
Which refrigerant is an equipment room refrigerant monitor required under ASHRAE Standard 15? R-12, R-134a, R-11, or all of them
all of them
True or False: Recycling and recovery equipment manufactured after November 15, 1993 must have an oil separator.
False
EPA regulations require that all appliances containing more than 50 pounds of refrigerant (except for commercial and industrial process refrigeration) can be repaired when what leak rate percentage of the charge per year.
15%
The evaporation temperature of R-134a at 0 psig is at what degree Fahrenheit?
-15 degrees F
After refrigerant liquid has been recovered from the appliance, what should you do with any remaining vapor?
it should be condensed by the recovery system
Removal of the refrigerant charge from a system can be conducted more quickly by doing what?
packing the recovery device vessel in ice
Your recovery/recycling machine has R-502 refrigerant in it. You now have to recover refrigerant from a unit with R-22. What must be done before R-22 refrigerant can be recovered/recycled?
recover as much of the R-502 from the recovery unit as possible, change the filter, and evacuate