EPA 608 Type III Study Guide
The state of the refrigerant entering the metering device is: - answer-High pressure liquid
The following components are metering devices: - answer-Evaporator pressure regulator,
Thermostatic expansion valve
The state of the refrigerant entering the compressor is: - answer-Low pressure vapor
Before the recovery process can be initiated, a technician must know: - answer-The type of
refrigerant in the system
Checking the pressure of a recovery cylinder at a known temperature can determine: - answer-
The type of refrigerant in the cylinder
If recovery equipment manufactured after 11-15-93 is used to recover refrigerant from a small
appliance, the equipment must be able to: - answer-Recover 90% of the refrigerant from the
appliance
Technicians must be certified to handle refrigerants as of: - answer-November 14, 1994
Any vapor refrigerant vented from the top of a graduated charging cylinder while filling the
charging cylinder with liquid: - answer-Must be recovered
Recovery equipment head pressure can become excessive if: - answer-The inlet valve to the
recovery cylinder is not opened, The recovery cylinder contains non-condensables, The outlet
valve of the recovery machine is closed
A refrigeration system should not be recovered unless a gauge indicates a minimum pressure of
________ psig within the system. - answer-15 Psig
If a large leak occurs in a confined area, the recommended course of action is: - answer-
Ventilate and evacuate area
What is the pressure inside a cylinder of R-500 at room temperature (about 75 ˚F) - answer-95
psig
When recovering a system charged with 100 pounds of R-502 with a recovery machine
manufactured after 11-15-93, you must: - answer-Evacuate the system to 10 inches of mercury
vacuum
When recovering a system charged with 100 pounds of R-22 with a recovery machine
manufactured before 11-15-93, you must: - answer-Evacuate system to atmospheric pressure
, When recovering a system charged with 500 pounds of R-500 with a recovery machine
manufactured after
11-15-93, you must: - answer-Evacuate the system to 15 inches of mercury vacuum
When recovering a system charged with R-11 with a recovery machine manufactured after 11-
15-93, you
must: - answer-Evacuate the system to 25 mm mercury vacuum absolute
Charging a low-pressure chiller with liquid refrigerant while the chiller is in a deep vacuum
should be avoided because: - answer-It is likely to cause the water tubes to freeze and burst
When recharging a completely evacuated low pressure chiller you should charge with vapor
until the system pressure in the shell is equivalent to 36 F. - answer-Yes
A system pressure of 16.9 is necessary in the shell of a CFC-11 chiller before liquid charging can
begin. - answer-True
When recovering refrigerant from a chiller: - answer-The recovery machine, recovery machine
water pump, and system water pumps should be running
The purge unit of a low-pressure chiller: - answer-Is necessary in order to remove non -
condensables from the system
The suction line of a purge unit is connected: - answer-To the top of the condenser
Low- pressure chillers require purge units because: - answer-They operate below one
atmosphere
The rupture disc of a low-pressure chiller: - answer-Is located on the evaporator, and relieves at
15 Psig
The lowest physical access valve on a chiller is: - answer-The evaporator charging valve
Air and non-condensables generally enter a chiller from: - answer-Fittings and gaskets
What is the purpose of a hydrostatic test kit? - answer-Test tubing for leaks
According to ASHRAE standard 3, leak checking and repairs are recommended if a system is
evacuated to a pressure of 1 mm. Hg. vacuum, and then system pressure rises to 2.5 mm during
the "time to rise" test. - answer-True
The best method of reducing refrigerant release during the purge cycle is to: - answer-Find and
repair leaks
The state of the refrigerant entering the metering device is: - answer-High pressure liquid
The following components are metering devices: - answer-Evaporator pressure regulator,
Thermostatic expansion valve
The state of the refrigerant entering the compressor is: - answer-Low pressure vapor
Before the recovery process can be initiated, a technician must know: - answer-The type of
refrigerant in the system
Checking the pressure of a recovery cylinder at a known temperature can determine: - answer-
The type of refrigerant in the cylinder
If recovery equipment manufactured after 11-15-93 is used to recover refrigerant from a small
appliance, the equipment must be able to: - answer-Recover 90% of the refrigerant from the
appliance
Technicians must be certified to handle refrigerants as of: - answer-November 14, 1994
Any vapor refrigerant vented from the top of a graduated charging cylinder while filling the
charging cylinder with liquid: - answer-Must be recovered
Recovery equipment head pressure can become excessive if: - answer-The inlet valve to the
recovery cylinder is not opened, The recovery cylinder contains non-condensables, The outlet
valve of the recovery machine is closed
A refrigeration system should not be recovered unless a gauge indicates a minimum pressure of
________ psig within the system. - answer-15 Psig
If a large leak occurs in a confined area, the recommended course of action is: - answer-
Ventilate and evacuate area
What is the pressure inside a cylinder of R-500 at room temperature (about 75 ˚F) - answer-95
psig
When recovering a system charged with 100 pounds of R-502 with a recovery machine
manufactured after 11-15-93, you must: - answer-Evacuate the system to 10 inches of mercury
vacuum
When recovering a system charged with 100 pounds of R-22 with a recovery machine
manufactured before 11-15-93, you must: - answer-Evacuate system to atmospheric pressure
, When recovering a system charged with 500 pounds of R-500 with a recovery machine
manufactured after
11-15-93, you must: - answer-Evacuate the system to 15 inches of mercury vacuum
When recovering a system charged with R-11 with a recovery machine manufactured after 11-
15-93, you
must: - answer-Evacuate the system to 25 mm mercury vacuum absolute
Charging a low-pressure chiller with liquid refrigerant while the chiller is in a deep vacuum
should be avoided because: - answer-It is likely to cause the water tubes to freeze and burst
When recharging a completely evacuated low pressure chiller you should charge with vapor
until the system pressure in the shell is equivalent to 36 F. - answer-Yes
A system pressure of 16.9 is necessary in the shell of a CFC-11 chiller before liquid charging can
begin. - answer-True
When recovering refrigerant from a chiller: - answer-The recovery machine, recovery machine
water pump, and system water pumps should be running
The purge unit of a low-pressure chiller: - answer-Is necessary in order to remove non -
condensables from the system
The suction line of a purge unit is connected: - answer-To the top of the condenser
Low- pressure chillers require purge units because: - answer-They operate below one
atmosphere
The rupture disc of a low-pressure chiller: - answer-Is located on the evaporator, and relieves at
15 Psig
The lowest physical access valve on a chiller is: - answer-The evaporator charging valve
Air and non-condensables generally enter a chiller from: - answer-Fittings and gaskets
What is the purpose of a hydrostatic test kit? - answer-Test tubing for leaks
According to ASHRAE standard 3, leak checking and repairs are recommended if a system is
evacuated to a pressure of 1 mm. Hg. vacuum, and then system pressure rises to 2.5 mm during
the "time to rise" test. - answer-True
The best method of reducing refrigerant release during the purge cycle is to: - answer-Find and
repair leaks
