EPA Section 608 Technician Certification Study
Guide Latest Update 2024-2025 Actual Exam 300
Questions and 100% Verified Correct Answers
Guaranteed A+
A recovery machine should be checked daily for what? - CORRECT ANSWER:
Refrigerant leaks.
A vacuum pump that is too large can cause what problem? - CORRECT ANSWER: It
can cause moisture to freeze in the system.
A vacuum pump that is too large for a particular system can cause what problem? -
CORRECT ANSWER: It can cause moisture to freeze in the system.
According to ASHRAE 3-1990 what rise is permitted in vacuum level during a standing
vacuum test? - CORRECT ANSWER: Starting at 1mm of Hg., after 12 hours the
vacuum reading should not increase to more than 2.5 mm of Hg.
According to ASHRAE Standard 15 what is the standard for refrigerant concentration for
a machine room that must not be exceeded without activating an alarm and starting
ventilation in the machine room? - CORRECT ANSWER: May not exceed the TLV-TWA.
(Threshold limit value-Time weighted average.)
After a liquid recovery what must be done with the vapor still in the system? -
CORRECT ANSWER: A vapor recovery must be performed.
After liquid recovery what must be done with the vapor still in the system? - CORRECT
ANSWER: Vapor recovery must be performed.
Ammonia hydrogen, and water can be found in the refrigerators in some campers and
other recreational vehicles. Should these compounds be recovered with EPA approved
recovery equipment? - CORRECT ANSWER: No.
,Are multiple relief valves connected in series or parallel? - CORRECT ANSWER:
Parallel.
Are multiple relief valves connected in series or parallel? - CORRECT ANSWER:
Parrallel.
As the capacity and suction hose size increase what happens to the time needed for an
evacuation? - CORRECT ANSWER: Time is reduced.
ASHRAE Standard 15 covers refrigerant level monitoring for what refrigerants? -
CORRECT ANSWER: All refrigerants.
Before entering an area of a large leak of refrigerant what apparatus must be worn? -
CORRECT ANSWER: Self contained breathing apparatus.
Before using a recovery unit - CORRECT ANSWER: the technician should check
service valve positions and check the recovery unit oil level. What additional step must
be taken?,All solenoid valves should be open.
By recovering refrigerants we ensure adequate supplies and prevent venting. What else
does the recovery of refrigerants accomplish? - CORRECT ANSWER: Prevents
stratospheric ozone depletion.
Can a standard vacuum pump be used as a recovery machine? - CORRECT ANSWER:
In theory yes, but unlikely. First it would have to be certifiable, second it would have to
be connected to a non-pressurized recovery container.
Can ester based oils be mixed with other oils? - CORRECT ANSWER: No.
Can mixed refrigerants be reclaimed? - CORRECT ANSWER: No.
,Can oxygen be used to check for leaks? If not why not? - CORRECT ANSWER: No.
Oxygen in the presence of oil under high pressure can be explosive.
Describe a system-dependent (passive) recovery process for small appliances. -
CORRECT ANSWER: Evacuate or cool a cylinder. Connect the high and low hoses to
the system. Pull refrigerant into the cylinder with vacuum or the low tank pressure.
Do state and local laws have priority over federal law? Can they be less strict? -
CORRECT ANSWER: No. Cities or states can create their own laws but they must be at
least as strict as federal laws.
Does a thorough evacuation remove moisture from a system? - CORRECT ANSWER:
Yes.
Does stratospheric ozone help or hurt the work of the earth's protective shield? -
CORRECT ANSWER: It helps.
Does the EPA require the repair of leaks on small appliances? - CORRECT ANSWER:
Repair of leaks on small appliances is not required, but leaks should be repaired
whenever possible.
Falsifying or failing to keep required records failing to reach required evacuation levels
and knowingly releasing CFC or HCFC refrigerants, are a violations of the Clean Air Act.
What activity with a substitute refrigerant is also a violation? - CORRECT ANSWER:
Knowingly venting CFC's, HCFC's and their substitutes.
For safety refrigerant cylinders should not be rusted or damaged and always properly
color coded. What additional step should also be taken with these cylinders? -
CORRECT ANSWER: Properly secured at all times.
For what purpose are soap bubbles used in leak checking? - CORRECT ANSWER: For
a visual check for leaks.
, How can a system be leak checked using a low pressure gauge? - CORRECT
ANSWER: Vacuum reading will rise when vacuum pump is turned off.
How can ice be removed from a sight glass? - CORRECT ANSWER: Cleaned with an
alcohol spray.
How can ice be removed from a sight glass? - CORRECT ANSWER: With alcohol
spray.
How can you prevent moisture from freezing during dehydration? - CORRECT
ANSWER: You can raise the pressure with nitrogen and allow the ice to melt, then
continue with the evacuation.
How close should the vacuum gauge be connected to the vacuum pump during
evacuation? - CORRECT ANSWER: As far away as possible.
How do we know CFC's get to the stratosphere? - CORRECT ANSWER: From high
altitude air sampling measurements.
How do we know the chlorine in the stratosphere is coming from CFC's? - CORRECT
ANSWER: The increase in chlorine and fluorine present in the stratosphere, matches
the increase in emissions of CFC's.
How do you leak check an HFC-134a system with a partial charge (no HFC-134a
detector available)? - CORRECT ANSWER: Recover remaining 134a, pressurize the
system with nitrogen and a trace charge of R-22 so you can use an HCFC electronic
leak detector.
How do you leak check an HFC-134a system with a partial charge (no HFC-134a
detector available)? - CORRECT ANSWER: Recover the remaining 134a and then
pressurize the system with nitrogen and a trace charge of R-22 so you can use an
HCFC electronic leak detector.
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