EPA 608 Type II Practice Test – High-Pressure Systems
High-pressure systems such as R-22 and R-410A: evacuation levels, leak rates, recovery and charging. Tap an answer to check it.
Score: 0 / 0 (35)
Question 1
Required evacuation for a high-pressure appliance (e.g., R-22) with LESS than 200 lb of refrigerant, using recovery equipment made after Nov 15, 1993:
40 CFR 82.156 Table 1: high-pressure appliance under 200 lb = 0 in. Hg with equipment made before or after Nov 15, 1993.
Question 2
Required evacuation for a high-pressure appliance with 200 lb or MORE of refrigerant, using recovery equipment made after Nov 15, 1993:
High-pressure, 200 lb or more: 4 in. Hg with pre-1993 equipment, 10 in. Hg with equipment made on or after Nov 15, 1993.
Question 3
Required evacuation for a high-pressure appliance with 200 lb or more, using recovery equipment made BEFORE Nov 15, 1993:
Older recovery equipment has the lower requirement: 4 in. Hg.
Question 4
Required evacuation for a medium-pressure appliance (e.g., R-134a) with LESS than 200 lb, using recovery equipment made after Nov 15, 1993:
Medium-pressure under 200 lb: 4 in. Hg (pre-1993 equipment) or 10 in. Hg (newer equipment).
Question 5
Required evacuation for a medium-pressure appliance with 200 lb or MORE, using recovery equipment made after Nov 15, 1993:
Medium-pressure, 200 lb or more: 4 in. Hg (pre-1993) or 15 in. Hg (newer equipment).
Question 6
Required evacuation for a very high-pressure appliance (e.g., R-23):
Very high-pressure appliances only need to be brought to 0 in. Hg with any recovery equipment.
Question 7
If the repair is NOT major and the system will not be vented to the atmosphere after the repair, a high-pressure appliance must be evacuated to:
For non-major repairs the appliance only needs to reach 0 psig before it is opened.
Question 8
Which repair is a MAJOR repair?
Major repair = removing the compressor, condenser, evaporator or auxiliary heat exchange coil, or uncovering more than 4 square inches of flow area for more than 15 minutes.
Question 9
For an oil change, a high-pressure appliance must be evacuated or pressurized to no higher than:
40 CFR 82.156(a)(1)(iii): for oil changes, evacuate or pressurize to no higher than 5 psig, or drain the oil into a receiver that is brought to 5 psig or less.
Question 10
If leaks make it impossible to reach the required vacuum, the technician must:
Isolate leaking from non-leaking components. Non-leaking parts go to the Table 1 levels, leaking parts to the lowest level possible without contaminating the refrigerant (max 0 psig).
Question 11
System-dependent recovery equipment may NOT be used on appliances with more than:
Unless it is a permanently attached pump-out unit, system-dependent equipment is limited to 15 lb or less.
Question 12
After reaching the required recovery vacuum, why should you wait a few minutes?
If pressure climbs back up, more refrigerant is boiling out. Continue recovery.
Question 13
How can recovery from a large high-pressure system be sped up?
Removing liquid first moves most of the refrigerant quickly. Chilling the recovery cylinder or warming the appliance also helps.
Question 14
Which action helps speed up recovery?
A colder cylinder has lower pressure, so refrigerant flows into it faster. Heating the appliance (not the cylinder) also helps.
Question 15
When a recovery machine is switched to a different refrigerant, what reduces cross-contamination?
Clear the old refrigerant and oil out of the machine and hoses before recovering a different refrigerant.
Get all 381 questions in the app
Mock exams of 25 questions like test day, a readiness score for every section, mistake review and the 100-question Universal exam. English and Español, no ads.
▶ Get it on Google PlayQuestion 16
Which is a sign of a leak in a high-pressure system?
A low refrigerant charge starves the evaporator, which shows up as high superheat.
Question 17
On a hermetic system, what visible sign often points to a leak?
Oil travels with refrigerant, so oily spots often mark a leak.
Question 18
Before charging or recharging a high-pressure system, you should:
Charging a leaking system wastes refrigerant and causes illegal emissions.
Question 19
What is the preferred order of gases for leak testing?
Nitrogen alone is best. A trace of HCFC-22 with nitrogen lets an electronic detector work and is better than using pure refrigerant.
Question 20
For appliances with 50 lb or more of ODS refrigerant, what is the leak rate threshold for COMFORT COOLING?
Current leak rates (40 CFR 82.157): comfort cooling 10%, commercial refrigeration 20%, industrial process refrigeration 30%. Older study guides list 15% and 35%.
Question 21
What is the leak rate threshold for COMMERCIAL refrigeration (50 lb or more)?
Commercial refrigeration (supermarkets, restaurants, cold storage) must repair leaks above 20% per year.
Question 22
What is the leak rate threshold for INDUSTRIAL PROCESS refrigeration (50 lb or more)?
Industrial process refrigeration has the highest allowed rate: 30%.
Question 23
How long does an owner have to repair a leak once the leak rate is exceeded?
Leaks must be repaired within 30 days of the refrigerant addition that showed the excess leak rate, or 120 days when an industrial process shutdown is required.
Question 24
After a leak repair, which tests are required?
The initial test confirms the repair; the follow-up test is done within 10 days after the system returns to normal operation.
Question 25
An appliance with 50 lb or more that leaks 125% or more of its full charge in a calendar year must:
These are 'chronically leaking appliances'. The report describes efforts to find and repair the leaks.
Question 26
How long must leak repair records be kept?
Records under the leak repair rule must be kept for at least three years.
Question 27
If an owner cannot repair leaks below the threshold, what may they do instead?
The owner must develop and follow a plan to retrofit or retire the appliance.
Question 28
To convert gauge pressure (psig) to absolute pressure (psia), you:
psia = psig + 14.7 (atmospheric pressure at sea level).
Question 29
How can you identify the refrigerant in a high-pressure appliance?
The nameplate states the refrigerant. A standing pressure that matches the PT chart at the measured temperature confirms it.
Question 30
In which component is refrigerant normally stored as a liquid when the system is pumped down?
The receiver, after the condenser, holds high-pressure liquid refrigerant.
Question 31
What does a suction-line accumulator do?
The accumulator traps liquid in the suction line so the compressor receives only vapor.
Question 32
What is the state of the refrigerant in the liquid line leaving the condenser?
The condenser turns hot vapor into liquid; the liquid line carries high-pressure, slightly subcooled liquid to the metering device.
Question 33
Are hydrocarbon refrigerants (such as propane) approved for retrofitting existing high-pressure systems?
Hydrocarbons are flammable and are not approved as retrofits for existing high-pressure equipment.
Question 34
Where in a system is refrigerant found as a low-pressure vapor?
After absorbing heat in the evaporator, the refrigerant returns to the compressor as a low-pressure vapor.
Question 35
Why should a hermetic compressor never be energized while the system is under deep vacuum?
Under vacuum the insulating strength inside the motor drops and the windings can arc and burn out.
Want more Type II questions?
These are the first 35 of 110 Type II questions. The app has all of them, plus timed mock exams that mix questions like the real test.
Get all 381 questions in the app
Mock exams of 25 questions like test day, a readiness score for every section, mistake review and the 100-question Universal exam. English and Español, no ads.
▶ Get it on Google PlayOfficial sources
The questions are written by us from these U.S. government sources. Always check them for the current rules.