NEW
Font size
WorksheetsEPA 608 Exam Study Type II
Total questions: 25
Worksheet time: 13mins
It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. However, it;
often contains moisture
requires a minimum of 10 psig
is toxic when released into the environment
requires a pressure regulator
When can appliances containing refrigerants be recovered to atmospheric pressure?
for major repairs such as replacing the compressor , condenser, or evaporator
the repair is followed by an evacuation of the appliance to the environment
leaks in the appliance make recovery to the prescribed level unattainable
the appliance is being disposed of and recycled
Which of the following repairs would always be considered "major" under EPA's regulations
Replacement of an evaporator coil
Replacement of a filter-drier
Replacement of a Schrader valve core
Replacement of a condenser fan motor
Before making a major repair, technicians must evacuate an appliance or component containing more than 200 pounds of R-410A to which of the following levels?
0 PSIG
25mm Hg absolute
10 inches of Hg vacuum
15 inches of Hg vacuum
How can you speed up the removal of the refrigerant charge from a system?
using a smaller recovery vessel
cooling the recovery cylinder to lower it's pressure
using a two-stage vacuum pump
heating the recovery cylinder to raise it's pressure
You are changing out the compressor of a system containing 40 pounds of R-404A. In addition to isolating the compressor, which of the following procedures should you follow?
simply remove the compressor and cap the ends
evacuate the isolated section of the system to atmospheric pressure, then remove the compressor
evacuate the isolated section of the system to 0 PSIG and if system pressure does not rise after a few minutes remove the compressor
evacuate the isolated section of the system to 18" Hg and if system pressure does not rise after a few minutes energize the compressor
How would you remove moisture from refrigerant in a system?
purge the condenser
drain the oil seperator
reduce water flow to the condenser
use a filter-drier
Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums?
it runs faster than other equipment with oil-less compressors
the motor relies on the flow of refrigerant through the compressor for cooling.
it has a higher compression ratio limit than other equipment
the oils used in hermetic compressors are a lower viscosity than the oils used in other equipment
Which part of a belt driven non-hermetic compressor is most likely to leak if the compressor is not been used for several months?
suction service valve
rotating shaft seal
one or both of the king valves
head gaskets on discharge side
What is the state of the refrigerant leaving the receiver in a refrigeration system?
low pressure liquid
low pressure vapor
high pressure liquid
high pressure vapor
After a leak repair of a supermarket rack using 3000lbs of R-22 and a successful initial verification test, when must a follow up leak verification test be conducted?
the same day
the next day
within 10 days
within 30 days
Where must you connect the hose in order to recover liquid refrigerant?
the compressor suction valve
the compressor discharge valve
the liquid line
the condenser inlet
An initial leak verification test failed after repairing a leak in a rack refrigeration system for a supermarket using an HCFC refrigerant . What would be the next step?
immediately retrofit or retire the appliance
conduct additional repairs within 30 day repair window or mothball the appliance.
conduct a follow-up verification test
report the amount of refrigerant added to the system to the EPA
When first inspecting hermetic system known to be leaking, you should look for?
frost on the tubing
puddles of refrigerant
particles of filter-drier core
traces of oil
After refrigerant liquid has been recovered from the appliance, any remaining vapor is?
purged to the atmosphere
isolated in the appliance
pumped into appliance receiver
removed by the recovery system
Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following?
water
oil
refrigerant
non-condensibles
When is it against EPA regulations to use system-dependent recovery equipment?
when the compressor of the appliance is operational
when the ambient temperature is over 105°F.
when the appliance contains over 15 pounds of refrigerant.
when the appliance is leaking
Identify the best method to charge a system that has both an air-cooled condenser and evaporator with a name plate charge of 80 pounds.
vapor charge through the suction service valve
liquid charge through the discharge service valve
liquid charge through the suction service valve
liquid charge through the liquid-line service valve.
When recovery is first started, at what phase is the refrigerant removed to save recovery time?
recovery phase
recycle phase
liquid phase
vapor phase
When could a reciprocating compressor be damaged if energized?
when the discharge service valve is closed
when the suction service valve is open
when the discharge service valve is open
when the demand for cooling is at a steady state
Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover refrigerant from an R-410A unit. What must be done before recovery?
change the recovery cylinder on the recovery machine
change the expansion valve on the recovery machine
change the filter and expansion valve on the recovery machine
remove the R-22 from recovery unit and change the filter
Starting in 2019, what rate triggers the EPA requirement that commercial refrigeration systems containing 50 pounds or more of R-22 be repaired?
10%
20%
30%
35%
Which of the following statements about recycling and recovery equipment is FALSE?
it must be tested by an EPA approved third party
purchases of such equipment must be reported to the EPA.
it must be equipped with low-loss fittings
equipment designed to recover flammable refrigerant must meet a specific UL safety standard
What should be done after reaching the required recovery vacuum on an appliance?
immediately disconnect the recycling or recovery equipment, and open the system for service
wait for at least a few mins to see if the system pressure rises.
break the vacuum with nitrogen and open the system for service
pressurize the system with nitrogen and perform a leak check
For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE Standard 15 provided the mechanical ventilation system in the machinery is run continuously?
R-134a
R-404A
R-410A
R-717
