Question 1

What is the EPA definition of a Type II appliance?

Accepted Answer

Type II certification applies to technicians who maintain, service, repair, or dispose of medium, high, and very high-pressure appliances, excluding small appliances and MVACs.

Question 2

What is the required leak rate trigger for repairing 'Comfort Cooling' appliances containing 50 lbs or more of refrigerant?

Accepted Answer

For comfort cooling appliances with a charge of 50 lbs or more, the leak repair trigger rate is 10% annualized.

Question 3

What is the required leak rate trigger for repairing 'Commercial Refrigeration' appliances containing 50 lbs or more of refrigerant?

Accepted Answer

For commercial refrigeration systems containing 50 lbs or more, the leak rate threshold requiring repair is 20%.

Question 4

When a new system is assembled, what is the first thing that should be done?

Accepted Answer

Before charging or evacuating, a new system should be pressurized with dry nitrogen to check for leaks and ensure integrity.

Question 5

A filter drier should be replaced:

Accepted Answer

To prevent moisture contamination, the filter drier should be replaced every time the refrigerant circuit is opened.

Question 6

What indicates that a filter drier is clogged?

Accepted Answer

A clogged filter drier restricts flow, causing a pressure drop which results in a noticeable temperature drop across the device (it feels colder on the outlet).

Question 7

A moisture indicating sight glass is considered to be 'wet' when:

Accepted Answer

The color indicator in the sight glass changes (typically from green to yellow) when moisture is present in the system.

Question 8

When recovering refrigerant from a system containing 40 lbs of R-410A, the required evacuation level is:

Accepted Answer

For high-pressure appliances containing less than 200 lbs of refrigerant, the required recovery level is 0 inches Hg vacuum.

Question 9

When recovering refrigerant from a system containing 300 lbs of R-22, the required evacuation level is:

Accepted Answer

For high-pressure appliances containing 200 lbs or more of refrigerant, the required recovery level is 10 inches Hg vacuum.

Question 10

Before using a recovery unit to remove a charge, what steps should be taken?

Accepted Answer

Standard procedure includes checking valves, oil levels, and ensuring the recovery unit is clean/evacuated to prevent cross-contamination.

Question 11

To speed up the recovery process, a technician should:

Accepted Answer

Recovering liquid is faster than vapor. Heating the system drives refrigerant out, and cooling the tank lowers head pressure, all speeding up recovery.

Question 12

Where is the liquid line filter drier typically located?

Accepted Answer

The liquid line filter drier is installed in the liquid line, which is between the condenser outlet and the metering device inlet.

Question 13

What is the primary purpose of a crankcase heater?

Accepted Answer

Crankcase heaters keep the compressor oil warm to prevent refrigerant from migrating and condensing in the oil, which causes foaming and washout on startup.

Question 14

If a system has a major leak and you cannot reach the required vacuum level, you should:

Accepted Answer

If leaks prevent attaining the prescribed vacuum level, EPA regulations allow evacuating to atmospheric pressure (0 psig) to avoid pulling air into the recovery unit.

Question 15

Which part of the system is the receiver located in?

Accepted Answer

A receiver is a storage vessel located in the liquid line after the condenser, used to store excess liquid refrigerant.

Question 16

When charging an operating system with R-410A liquid, where should the refrigerant be introduced?

Accepted Answer

Liquid R-410A (a blend) must be throttled into the suction line (low side) while the system is running to flash it off and prevent liquid slugging of the compressor.

Question 17

An 'Industrial Process Refrigeration' system containing 1000 lbs of refrigerant must be repaired if the leak rate exceeds:

Accepted Answer

Industrial process refrigeration systems have the highest allowable leak rate threshold of 30%.

Question 18

The state of the refrigerant leaving the receiver is:

Accepted Answer

The receiver stores high-pressure liquid from the condenser, so the refrigerant leaving it is a high-pressure liquid.

Question 19

Why must you never start a reciprocating compressor with the discharge service valve closed?

Accepted Answer

Starting against a closed discharge valve traps the compressed gas in the cylinder head, causing pressure to rise instantly to dangerous levels, potentially destroying the compressor or causing injury.

Question 20

What is the best way to remove liquid refrigerant from a system during recovery?

Accepted Answer

The push-pull method is used to bulk transfer liquid refrigerant quickly from large systems by using vapor pressure to push liquid into the recovery tank.

Question 21

If a system is equipped with a receiver, recovery is best started from:

Accepted Answer

Since the receiver holds the bulk of the liquid, recovering from the receiver outlet (liquid line) is the most efficient starting point to remove liquid.

Question 22

When evacuating a system with large amounts of moisture, it may be necessary to:

Accepted Answer

Triple evacuation involves pulling a vacuum, breaking it with dry nitrogen (which absorbs moisture), and repeating the process to ensure deep dehydration.

Question 23

Which of the following is an indicator of a leak in a high-pressure system?

Accepted Answer

Refrigerant carries oil. Oil residues on fittings or joints often indicate that refrigerant has leaked from that spot.

Question 24

After a system repair, regulations require that the system be evacuated to:

Accepted Answer

While 500 microns is a service standard, EPA regulations specifically mandate evacuation levels (0, 10, or 15 inches Hg) based on the appliance classification and date of equipment manufacture.

Question 25

Once the initial verification test for a leak repair is successful, when must the follow-up verification test be conducted?

Accepted Answer

For systems >50 lbs, a follow-up verification test must be conducted within 10 days after the system returns to normal operation to ensure the repair holds.

Question 26

What happens if a leak rate exceeds the threshold and cannot be repaired within 30 days?

Accepted Answer

If a leak cannot be repaired within 30 days (or extensions), the owner must prepare a plan to retrofit or retire the appliance within 30 days.

Question 27

Accumulators are used to:

Accepted Answer

An accumulator is installed in the suction line to trap liquid refrigerant and oil, preventing liquid slugging of the compressor.

Question 28

In a Type II appliance, where is the evaporator coil located?

Accepted Answer

For a split-system AC, the evaporator coil is located indoors (air handler), absorbing heat from the conditioned space.

Question 29

Before opening a system for repair, you should always:

Accepted Answer

The primary rule of Section 608 is to recover refrigerant to specific vacuum levels before opening the system to the atmosphere.

Question 30

To change the compressor on a system containing 40 lbs of R-500, you must isolate the compressor and then:

Accepted Answer

Technically, the rule is 10" Hg for R-500 (old CFC, high pressure) systems unless it's a major repair on a small system... Wait. R-500 is high pressure. <200 lbs = 0" Hg? Actually, for R-500/R-12/R-22 (High Pressure), <200 lbs required 0" Hg. Wait, checking Table 1. <200 lbs HP = 0" Hg. So isolating and pulling to 0" Hg is correct. Let me correct the options to be clearer or match the <200lb rule. Correct option is 0" Hg (or 0 psig). I will set index to 0.

Question 31

A hermetic compressor must never be operated when:

Accepted Answer

Operating a hermetic compressor in a vacuum can cause electrical arcing between the motor windings (corona effect) and overheating.

Question 32

Identify the refrigerant that requires its own special recovery equipment because of its high operating pressure.

Accepted Answer

Very high-pressure refrigerants like R-13, R-23, or R-503 require specialized equipment. (Note: R-410A is high pressure but uses standard HP equipment. CO2 is Very High Pressure).

Question 33

When working with R-410A, you must use a gauge manifold with:

Accepted Answer

R-410A pressures are significantly higher than R-22. Hoses must be rated for at least 4000 psi burst and 800 psi working pressure.

Question 34

Soap bubbles are best used to:

Accepted Answer

Once a general area is identified (e.g., with an electronic detector), soap bubbles are applied to pinpoint the exact source of the leak.

Question 35

Backseating a suction shutoff valve will close the:

Accepted Answer

Backseating (turning fully counter-clockwise) a service valve closes off the gauge port, sealing the system for normal operation.

Question 36

The evaporation temperature of R-410A at 0 psig is approximately:

Accepted Answer

Wait, let's check the PT chart. R-410A at 0 psig boils at approximately -60°F (-51°C). R-22 boils at -41°F. Correct answer is -60°F.

Question 37

If a system is opened for servicing, what should be replaced?

Accepted Answer

Opening the system exposes it to moisture. The filter drier is a single-use component designed to absorb moisture and must be replaced whenever the system is opened.

Question 38

How often must comfort cooling appliances containing 50 lbs or more of refrigerant be leak inspected if they have NOT exceeded the leak rate?

Accepted Answer

Wait, let's verify. The requirement for periodic inspections usually kicks in AFTER the leak rate is exceeded. However, best practice (and some company policies) is annual. BUT, the EPA rule (40 CFR 82.157) mandates leak inspections *after* a leak has been repaired (quarterly/annually depending on type/rate) OR if the rate is exceeded. If the rate is NOT exceeded, mandatory inspections aren't explicitly required by EPA 608 for comfort cooling, though highly recommended. *Correction*: For Commercial Refrigeration and IPR >500lbs, annual/quarterly checks are required. For Comfort Cooling, only if rate exceeded. The trick here is the 'NOT exceeded' part. Correct answer: Not required.

Question 39

You are changing the compressor on a system containing 40 lbs of R-410A. In addition to isolating the compressor, you must:

Accepted Answer

For high-pressure systems <200 lbs, the recovery level is 0 inches Hg vacuum.

Question 40

The liquid receiver is NOT found on which type of system?

Accepted Answer

Capillary tube systems are critically charged and do not use liquid receivers, as the entire charge is active in the system.

Question 41

Using a large vacuum pump on a small system can cause:

Accepted Answer

If the vacuum drops too quickly, moisture in the system can flash-freeze into ice, which stops the dehydration process.

Question 42

When can you use a 'system-dependent' recovery equipment for Type II appliances?

Accepted Answer

System-dependent (passive) recovery is limited to appliances with 15 lbs of refrigerant or less. Above that, self-contained (active) equipment is required.

Question 43

Non-condensables in a system cause:

Accepted Answer

Non-condensables (air/nitrogen) enter the condenser but don't condense. They take up space and trap heat, raising the head (discharge) pressure.

Question 44

For a system containing 100 lbs of R-502 (CFC), the recovery level is:

Accepted Answer

R-502 is a high-pressure refrigerant. <200 lbs requires 0 inches Hg vacuum. (Note: R-502 is old CFC, but rules apply based on pressure type and weight).

Question 45

To determine the system charge for leak rate calculations, you should use:

Accepted Answer

The full charge is the factory charge (nameplate) plus any additional refrigerant added to accommodate field-installed piping (line sets).

Question 46

If a leak repair is successful, how long must records of the repair and verification tests be kept?

Accepted Answer

Owners/operators must keep records of leak inspections, repairs, and verification tests for 3 years.

Question 47

ASHRAE Standard 15 requires which safety device for a room housing a refrigerant system?

Accepted Answer

ASHRAE 15 requires a refrigerant sensor that triggers an alarm and mechanical ventilation if a leak occurs in a machinery room.

Question 48

When charging a system with 50 lbs of liquid refrigerant, you should charge into:

Accepted Answer

Bulk liquid charging should be done into the liquid line (high side) while the system is off to safely get the majority of the charge in without damaging the compressor.

Question 49

Recovered refrigerant may contain which of the following impurities?

Accepted Answer

Used refrigerant often contains contaminants like oil, moisture, acids, and particulates.

Question 50

If you are working on a system with a leak rate of 15% used for 'Industrial Process Refrigeration', do you need to repair it?

Accepted Answer

Industrial Process Refrigeration (IPR) systems have a leak rate threshold of 30%. A 15% leak does not trigger the mandatory repair requirement.

Type II (High-Pressure) Practice Questions

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