8.9 - Major Repair Special Conditions and Compressor Service

Module: Type II High and Very-High-Pressure Appliances
Regulatory verification date: August 12, 2026
Primary current authority: Current 40 CFR §§ 82.152 and 82.156 and current EPA Section 608 Type II test-topic/service-practice guidance
Course role: Connects the regulatory definition of major maintenance, service, or repair with practical Type II component replacement, leaking-system isolation, compressor replacement, burnout cleanup, filter-drier service, contaminated oil, and moisture-indicator interpretation

Learning Objectives

After completing this section, a student should be able to:

1. State the current Section 608 definition of major maintenance, service, or repair.
2. Identify compressor, condenser, evaporator, and auxiliary heat-exchanger removal as major work.
3. Explain why a task that is not one of the four named component removals can still be major when the refrigerant-circuit opening exceeds the regulatory size/time condition.
4. Distinguish common non-major service from major repair without assuming that a component name alone always determines the answer.
5. Explain the current refrigerant-removal requirements that apply before a major Type II repair.
6. Apply the current leaking-system isolation rule when Table 1 evacuation cannot be attained or would substantially contaminate recovered refrigerant.
7. Explain the service sequence for compressor replacement at an EPA 608 examination-preparation level.
8. Explain why refrigerant dissolved in compressor oil must be considered during recovery and oil handling.
9. Explain the purpose of replacing or servicing a filter-drier after opening a system and after a compressor burnout.
10. Describe the contamination associated with a compressor burnout, including acid, carbon, moisture, damaged oil, and decomposition products.
11. Explain the role of an acid test and why contaminated oil should not simply be left in the repaired system.
12. Interpret a moisture-indicating sight glass according to the manufacturer’s color scale, rather than memorizing a universal color meaning.

Introduction

Type II repair questions often combine two kinds of reasoning:

1. Regulatory classification — Is the work major or non-major, and what refrigerant-removal rule applies before the system is opened?
2. Technical service practice — Once the circuit is safely opened, what must be done to prevent moisture, acid, oil contamination, and debris from damaging the repaired system?

The current regulatory definition is precise.

Source: 40 CFR § 82.152

Major maintenance, service, or repair includes work involving removal of any of the following:

• Compressor.
• Condenser.
• Evaporator.
• Auxiliary heat-exchange coil.

The definition also includes work that uncovers an opening of more than:

4 in² of flow area

for more than:

15 minutes

Therefore:

Compressor removal
→ major repair

Condenser removal
→ major repair

Evaporator removal
→ major repair

Auxiliary heat-exchanger coil removal
→ major repair

But the reverse shortcut is not always safe:

Not one of those four named components
→ automatically non-major

because the 4 in² / 15-minute opening condition can independently make the work major.

Section 8.8 established the key consequence:

The limited Type II 0 psig non-major exception applies only when the repair is not major and the other conditions of § 82.156(a)(1) are satisfied.

For major work, the technician normally follows the current Table 1 refrigerant-removal requirement unless another specific current exception applies.

Key Concepts

1. Current Major-Repair Definition

Source: 40 CFR § 82.152

The current definition has two independent paths to major work.

Path A — Removal of a Named Major Component

Removal of any of these components makes the service major:

Compressor
Condenser
Evaporator
Auxiliary heat-exchange coil

The word removal is important.

For example:

• Removing and replacing a compressor is major.
• Removing an evaporator coil is major.
• Removing a condenser coil is major.
• Removing an auxiliary heat exchanger is major.

Path B — Large Refrigerant-Circuit Opening

A repair is also major when it uncovers an opening of:

more than 4 in² of flow area

for:

more than 15 minutes

Therefore, a repair involving another component can still become major if the size/time condition is met.

High-Priority Exam Rule

Named component removed?
→ MAJOR

or:

Opening > 4 in²
AND
open > 15 minutes?
→ MAJOR

2. Major Versus Non-Major Examples

Exam caution: Non-major does not mean no recovery required. The technician must still apply the correct Section 608 service-practice rule.

Refrigerant Removal Before Major Repair

1. Normal Major-Repair Case

Source: 40 CFR § 82.156(a)

Before opening a Type II appliance for a major repair, the technician normally must:

recover refrigerant
→ reach the applicable Table 1 endpoint
→ verify the endpoint
→ open the appliance or isolated section

The exact Type II Table 1 levels are in Section 8.8.

The limited non-major shortcut:

no higher than 0 psig before opening

is not the general rule for compressor, condenser, evaporator, or auxiliary heat-exchanger removal.

2. Isolation to a System Receiver

Source: 40 CFR § 82.156(a)

The technician may evacuate:

• The entire appliance, or
• Only the part being serviced,

when refrigerant in that part can be isolated to a system receiver.

This can be useful during:

• Compressor service.
• Filter-drier replacement.
• Valve replacement.
• Certain heat-exchanger repairs.

But the service section must still reach the applicable endpoint before opening.

Therefore:

Pump refrigerant into receiver
→ isolate receiver
→ evacuate service section
→ verify pressure
→ open section

Do not use:

Pump refrigerant into receiver
→ assume service section is empty

Leaking Systems and Major Repair

1. A Leak Does Not Automatically Cancel Table 1

Source: 40 CFR § 82.156(a)(2)

If leaks make normal Table 1 evacuation:

• Unattainable, or
• Likely to substantially contaminate the refrigerant being recovered,

then the technician must isolate leaking from non-leaking components wherever possible.

The correct logic is:

LEAK PREVENTS NORMAL TABLE 1
↓
ISOLATE where possible

For a non-leaking portion that will be opened:

NON-LEAKING SECTION
→ normal Table 1 endpoint

For a leaking portion that will be opened:

LEAKING SECTION
→ lowest attainable pressure
without substantially contaminating recovered refrigerant
→ not above 0 psig

This rule applies whether the repair itself is major or non-major when the leak condition described in § 82.156(a)(2) controls.

2. Example — Leaking Evaporator, Non-Leaking Condensing Section

Suppose a large Type II system has:

• A leaking evaporator coil.
• A non-leaking condenser/receiver section.
• Isolation valves that permit the two sections to be separated.

The technician should not simply stop the whole system at 0 psig.

Instead:

Isolate leaking evaporator section
from non-leaking section

Then:

Non-leaking section to be opened
→ Table 1 if applicable

and:

Leaking evaporator section
→ lowest attainable
→ no higher than 0 psig

The exact service plan depends on which sections will actually be opened.

Compressor Replacement

1. Compressor Replacement Is Major Repair

Source: 40 CFR § 82.152

Removing a compressor is specifically listed in the definition of major maintenance, service, or repair.

Therefore:

Compressor replacement
→ major repair

The technician should first classify:

• Refrigerant.
• Pressure category.
• Full charge.
• Recovery equipment date where Table 1 requires it.
• Whether the system is leaking.
• Whether the compressor can be isolated.

Then apply the current Section 608 refrigerant-removal requirement.

2. General Compressor-Replacement Sequence

The exact manufacturer procedure controls, but a generalized Type II sequence is:

1. Diagnose compressor failure.
2. Identify refrigerant and oil.
3. Recover refrigerant to applicable endpoint.
4. Isolate compressor where system design permits.
5. Verify the isolated compressor/section is properly recovered.
6. Remove failed compressor.
7. Evaluate oil and contamination condition.
8. Replace required filter-drier(s) / cleanup components.
9. Install compatible replacement compressor.
10. Leak test with dry nitrogen.
11. Evacuate / dehydrate the repaired circuit.
12. Charge according to manufacturer procedure.
13. Start and verify operation.
14. Recheck oil, moisture, pressure, superheat/subcooling, and system condition as applicable.

The sequence above is a teaching framework, not a universal manufacturer service procedure.

3. Verify Replacement Compatibility

Before installing the compressor, confirm as applicable:

• Refrigerant compatibility.
• Oil type and viscosity.
• Voltage.
• Phase.
• Frequency.
• Capacity/application.
• Mounting.
• Suction/discharge connection size and orientation.
• Motor protection.
• Manufacturer-approved replacement model.

A compressor that physically fits is not automatically an acceptable replacement.

4. Refrigerant Can Remain in Compressor Oil

Compressor oil can dissolve a significant amount of refrigerant.

When pressure is reduced:

refrigerant leaves oil
→ vapor forms
→ pressure can rebound

This is why:

• Recovery can continue after initial flow slows.
• The compressor can still contain refrigerant even after another system section has reached a low pressure.
• Oil handling must be performed only after the applicable pressure requirement is satisfied.

Section 8.7 developed the pressure-rebound concept.

Oil Handling During Compressor Service

1. Current Oil-Change Pressure Provision

Source: 40 CFR § 82.156(a)(1)(iii)

For purposes of an oil change, current Section 608 permits the appliance or isolated portion to be:

evacuated or pressurized
→ no higher than 5 psig
→ before opening for oil removal

or the oil may be drained into a system receiver that is at:

no higher than 5 psig

This provision exists because refrigeration oil can contain dissolved refrigerant.

Do not confuse:

5 psig
→ oil-change provision

with:

0 psig
→ qualifying non-major Type II opening provision

or:

Table 1 vacuum values
→ normal refrigerant-removal endpoints

2. Inspect Removed Oil

Oil condition can provide useful diagnostic information.

Look for:

• Unusual darkening.
• Burned odor.
• Suspended carbon.
• Metal debris.
• Sludge.
• Water contamination.
• Acid indication using an appropriate test.

A technician should not assume that oil appearance alone proves the chemical condition.

Use manufacturer-approved service tests where needed.

Compressor Burnout

1. What Is a Burnout?

A compressor motor burnout occurs when motor winding insulation fails and the motor is severely overheated or electrically damaged.

A severe burnout can contaminate the refrigerant circuit with:

• Acidic decomposition products.
• Carbon residue.
• Burned oil.
• Moisture.
• Metal particles.
• Insulation debris.

Motor burnout can result from moisture, abnormal electrical conditions, loss of refrigerant, and high head pressure. Acid-core filtration is important in burnout cleanup.

For this project, treat compressor burnout as:

compressor failure
+
possible SYSTEM contamination

not simply:

replace compressor and recharge

2. Why Acids Form

Moisture, high temperature, refrigerant decomposition, damaged oil, and electrical insulation breakdown can produce corrosive chemical products.

Acid can attack:

• New compressor windings.
• Copper surfaces.
• Motor insulation.
• Bearings.
• Oil.
• Seals.

If contamination is not removed:

new compressor installed
→ contamination remains
→ new oil becomes contaminated
→ repeat compressor failure possible

3. Burnout Cleanup Principles

The exact cleanup procedure is manufacturer- and system-specific.

Common principles include:

1. Recover refrigerant using equipment suitable for contaminated refrigerant.
2. Avoid mixing severely contaminated refrigerant with known clean recovered refrigerant.
3. Remove the failed compressor.
4. Inspect or test the oil/contamination condition.
5. Remove accessible debris and contaminated oil as required.
6. Replace the liquid-line filter-drier.
7. Install additional cleanup filtration when specified, such as a suction-line burnout filter-drier.
8. Install the replacement compressor with correct oil.
9. Pressure-test the repair with dry nitrogen.
10. Evacuate/dehydrate thoroughly.
11. Recharge with the correct refrigerant.
12. Operate the system and monitor pressure, temperature, oil, moisture, and acid condition.
13. Replace temporary cleanup filter-driers when required by the manufacturer’s cleanup procedure.

Do not prescribe a universal number of filter-drier changes or a universal operating time before retesting; manufacturer procedures vary.

Filter-Drier Replacement

1. Purpose of the Filter-Drier

A filter-drier performs two important functions:

FILTER
→ captures particulate contamination

and:

DRIER
→ absorbs moisture

A liquid-line filter-drier uses fine screens to capture foreign particles and desiccant to absorb moisture.

Filter-driers can also be selected for acid cleanup in specific burnout applications.

2. When Filter-Drier Replacement Is Commonly Required

Follow the equipment/compressor manufacturer’s instructions.

Replacement is commonly appropriate after:

• Compressor replacement.
• Compressor burnout.
• System opened for major repair.
• Moisture contamination.
• Severe drier restriction.
• Refrigerant/oil conversion when required by the retrofit procedure.

Do not leave a saturated or contaminated filter-drier in a freshly repaired system.

3. Keep the New Drier Sealed Until Installation

Desiccant begins absorbing moisture from ambient air when the drier is opened.

Therefore:

Prepare piping / brazing setup
→ open new filter-drier package near installation time
→ install promptly

Do not leave the new drier open to humid air while other repair work continues.

4. Filter-Drier Direction

Many filter-driers have:

• A required flow direction.
• A directional arrow.

Install according to:

• Arrow.
• Manufacturer instructions.
• System application.

Some heat-pump applications require specifically designed bi-directional driers or different placement.

Do not assume every liquid-line drier can be installed in either direction.

5. A Restricted Drier Creates a Pressure Drop

A severely restricted filter-drier can create:

• Liquid-line pressure drop.
• Flash gas downstream.
• Temperature drop across the drier.
• Starved evaporator.
• Low capacity.
• High superheat.

This can imitate symptoms of low charge.

Therefore:

High superheat
→ do not automatically diagnose leak

A restriction is another possible cause.

Moisture Indicators and Sight Glasses

1. Moisture-Indicating Sight Glass

Many liquid-line sight glasses combine two functions:

1. Visual observation of refrigerant condition.
2. Chemical moisture indication.

The indicator element changes color according to moisture level.

However:

The actual color meaning is manufacturer-specific.

Do not create a universal exam rule such as:

green always means dry
and
yellow always means wet

unless the specific indicator manufacturer states those colors.

The correct service method is:

read indicator
→ compare with manufacturer's color legend
→ interpret at stabilized operating conditions

2. Why Moisture Matters

Moisture can cause:

• Acid formation.
• Corrosion.
• Copper plating.
• Oil degradation.
• Ice at the metering device.
• Motor insulation damage.
• Reduced system reliability.

A system that has been open for major repair should therefore be:

sealed promptly
→ leak tested
→ evacuated/dehydrated
→ verified before charging

3. Bubbles Do Not Always Mean Low Charge

A sight glass with bubbles can result from:

• Low refrigerant charge.
• Flash gas caused by pressure drop.
• Warm liquid line.
• Restricted filter-drier.
• Insufficient subcooling.
• System operating transition.

Therefore:

bubbles
≠ automatic proof of low charge

Use complete system diagnostics.

Condenser and Evaporator Replacement

1. Both Are Major Repairs

Source: 40 CFR § 82.152

Removal of either:

Condenser

or:

Evaporator

is major maintenance, service, or repair.

The limited non-major 0-psig provision does not control simply because the technician plans to complete the replacement quickly.

2. General Replacement Considerations

Before removing a condenser or evaporator:

• Identify refrigerant.
• Recover to the applicable endpoint.
• Isolate sections where system design permits.
• Verify trapped refrigerant is not present.
• Protect open tubing from moisture and debris.
• Replace filter-drier as required by manufacturer/service procedure.
• Pressure-test with dry nitrogen after repair.
• Evacuate/dehydrate before charging.

During brazing, use nitrogen flow where required by good HVAC service practice to reduce internal oxidation, but the detailed brazing procedure is outside the Section 608 exam scope of this section.

Auxiliary Heat-Exchanger Replacement

1. Regulatory Classification

Source: 40 CFR § 82.152

Removal of an:

auxiliary heat-exchange coil

is specifically included in the current major-repair definition.

Examples of auxiliary heat exchangers can vary by appliance design.

Do not interpret auxiliary heat exchanger as only an electric-resistance heater; the regulatory term refers to a refrigerant-containing heat-exchange coil/component.

Non-Major Component Replacement

1. Filter-Drier, Solenoid Valve, or Small Control Component

A filter-drier or small refrigerant control component is not one of the four components named in the major-repair definition.

However:

Not named
≠ automatically non-major

The technician must still consider:

opening > 4 in² flow area?

and:

open > 15 minutes?

If both are true, the repair is major under the second part of the definition.

If not, the work may be non-major.

Then determine whether the limited § 82.156(a)(1) non-major opening provision applies.

Technical and Service Details

1. Major-Repair Decision Sequence

Use this sequence:

STEP 1
Will compressor, condenser,
evaporator, or auxiliary heat-exchange coil be removed?

If yes:

MAJOR

If no:

STEP 2
Will refrigerant-circuit opening be >4 in²
for >15 minutes?

If yes:

MAJOR

If no:

NON-MAJOR
subject to actual service condition

Then:

STEP 3
Apply current § 82.156 evacuation rule

2. Major Repair Versus Non-Major Service-Practice Rule

Do not merge these four rows into one rule.

3. Compressor Replacement Checklist

Before opening:

• Confirm compressor failure.
• Identify refrigerant/oil.
• Determine major-repair status.
• Recover refrigerant properly.
• Check isolation valves.
• Verify compressor/section pressure.

During repair:

• Prevent open-system moisture entry.
• Remove failed compressor.
• Evaluate oil for contamination.
• Install correct replacement compressor.
• Replace/service filter-drier as specified.
• Apply burnout cleanup if required.

After repair:

• Nitrogen pressure test.
• Leak locate/repair if needed.
• Evacuate/dehydrate.
• Charge correctly.
• Confirm operation.
• Check moisture/acid condition where applicable.

4. Clean Failure Versus Burnout Failure

Do not assume every failed compressor is a burnout.

5. Moisture-Indicator Interpretation

Use this sequence:

System operating and stabilized
→ observe moisture indicator
→ compare color to manufacturer legend
→ if moisture indicated, investigate drying / drier condition

Do not diagnose from color without the indicator’s scale.

Important Terms

Acid Test

An acid test is a service test used to determine whether refrigeration oil/system contamination includes unacceptable acidic products. The test method and interpretation depend on the specific test kit.

Auxiliary Heat-Exchange Coil

An auxiliary heat-exchange coil is a refrigerant-containing auxiliary heat exchanger recognized in the current Section 608 major-repair definition. Removing it constitutes major maintenance, service, or repair.

Compressor Burnout

A compressor burnout is severe electrical/motor failure that can thermally and chemically contaminate the refrigerant circuit with damaged oil, acid, carbon, moisture, and debris.

Contaminated Oil

Contaminated oil is refrigeration lubricant containing undesirable moisture, acid, carbon, metal particles, decomposition products, incorrect lubricant, or other foreign material.

Filter-Drier

A filter-drier is a refrigerant-system component that filters particulate contamination and contains desiccant to remove moisture. Special burnout driers can also provide acid-cleanup capability.

Major Maintenance, Service, or Repair

Major maintenance, service, or repair is current Section 608 terminology for service involving removal of the compressor, condenser, evaporator, or auxiliary heat-exchange coil, or an opening greater than 4 in² of flow area for more than 15 minutes.

Moisture Indicator

A moisture indicator is a chemical indicator, often integrated into a liquid-line sight glass, that changes color according to moisture condition. Color interpretation must follow the manufacturer legend.

System Receiver

A system receiver is the isolated portion of an appliance, or a specific vessel within the appliance, used to hold refrigerant charge during servicing or repair.

EPA 608 Exam Focus

What Students Must Remember

• Compressor removal = major repair.
• Condenser removal = major repair.
• Evaporator removal = major repair.
• Auxiliary heat-exchange coil removal = major repair.
• An opening greater than 4 in² for more than 15 minutes also makes the repair major.
• A filter-drier is not one of the four named major components.
• A non-listed component repair can still be major because of the opening-size/time criterion.
• The limited non-major Type II opening provision does not apply to compressor, condenser, evaporator, or auxiliary heat-exchanger removal.
• Normal major-repair recovery uses the applicable Table 1 endpoint.
• Refrigerant may be isolated in a system receiver when the appliance design permits, but the section being opened must still reach the applicable endpoint.
• If leakage prevents Table 1, isolate leaking and non-leaking portions wherever possible.
• Non-leaking portions to be opened go to Table 1.
• Leaking portions to be opened go to the lowest attainable pressure, not above 0 psig.
• Oil can contain dissolved refrigerant.
• The special oil-change provision is no higher than 5 psig.
• Compressor burnout can contaminate the entire refrigerant circuit.
• Burnout cleanup includes contamination control, filter-drier service, proper evacuation, and follow-up evaluation.
• Filter-driers remove moisture and particulate contamination.
• A filter-drier can become restricted.
• Moisture indicators must be read according to the manufacturer’s color legend.
• Bubbles in a sight glass do not automatically prove low charge.

High-Priority Major-Repair Decision

Remove compressor / condenser / evaporator /
auxiliary heat-exchange coil?
→ YES → MAJOR

Otherwise:

Opening >4 in²
AND
open >15 min?
→ YES → MAJOR

Otherwise:

Potentially non-major
→ check § 82.156 service conditions

High-Priority Special-Condition Table

Typical Exam Question Patterns

Students may be asked to:

• Identify compressor replacement as major repair.
• Identify condenser or evaporator replacement as major repair.
• Identify auxiliary heat-exchanger removal as major repair.
• Apply the 4-in²/15-minute major-repair condition.
• Determine why a filter-drier replacement is not automatically major.
• Select Table 1 for a normal major repair.
• Apply the leaking-system isolation exception.
• Explain why refrigerant remains in compressor oil.
• Identify 5 psig as the oil-change pressure provision.
• Select filter-drier replacement after compressor burnout.
• Identify acid/carbon/moisture as burnout contamination concerns.
• Recognize that moisture-indicator colors are manufacturer-specific.
• Diagnose a restricted drier as a possible cause of high superheat.

High-Risk Words

Pay particular attention to:

• Removal
• Major
• Non-major
• More than 4 in²
• More than 15 minutes
• Compressor
• Condenser
• Evaporator
• Auxiliary heat exchanger
• Isolated
• Leaking
• 0 psig
• 5 psig
• Burnout
• Acid
• Moisture
• Filter-drier

Common Mistakes and Confusing Points

Mistake 1: Calling Every Component Replacement Major

Only the four named component removals are automatically major by component identity.

Other work must be evaluated against the opening-size/time criterion.

Mistake 2: Forgetting the 4-in² / 15-Minute Rule

A repair can be major even without removing one of the four named components.

Mistake 3: Treating Compressor Replacement as Non-Major Because the Compressor Is Isolated

Isolation can reduce the amount of refrigerant that must be moved, but compressor removal remains major work.

Mistake 4: Using 0 psig as the Normal Compressor-Replacement Endpoint

The limited 0-psig provision is for qualifying non-major work.

A normal compressor replacement is major and uses the applicable Table 1 requirement unless another specific exception controls.

Mistake 5: Treating a Leak as Permission to Ignore Non-Leaking Sections

Where isolation is possible, non-leaking sections to be opened must still reach Table 1.

Mistake 6: Ignoring Refrigerant Dissolved in Oil

Compressor oil can hold refrigerant and cause pressure rebound or release during oil removal.

Mistake 7: Confusing 5 psig With the General Type II Opening Rule

5 psig belongs to the specific oil-change provision.

Mistake 8: Replacing a Burned Compressor Without Cleaning the System

A burnout can contaminate the circuit and cause repeat compressor failure.

Mistake 9: Leaving the Old Filter-Drier After a Severe Burnout

Burnout cleanup normally requires appropriate filter-drier replacement/cleanup filtration according to the compressor and equipment manufacturer.

Mistake 10: Opening a New Filter-Drier Long Before Installation

The desiccant absorbs moisture from ambient air.

Keep it sealed until near installation time.

Mistake 11: Installing a Directional Drier Backward

Follow the arrow and manufacturer instructions.

Mistake 12: Assuming Sight-Glass Bubbles Always Mean Low Charge

Flash gas and restrictions can also create bubbles.

Mistake 13: Memorizing One Universal Moisture-Indicator Color

Indicator chemistry and color scales vary.

Use the manufacturer’s legend.

Mistake 14: Treating Every Compressor Failure as a Burnout

Mechanical failure and severe electrical burnout require different contamination assessment and cleanup intensity.

Concept-Check Questions

Question 8.9-1

Which service activity is automatically classified as major maintenance, service, or repair under the current Section 608 definition?

A. Replacing an external thermostat

B. Removing the compressor

C. Replacing an access-port cap

D. Tightening a cabinet screw

Question 8.9-2

A technician replaces a small liquid-line filter-drier. Which statement is most accurate?

A. Every filter-drier replacement is automatically major.

B. A filter-drier is not one of the four named major components, but the opening-size/time condition must still be evaluated.

C. Filter-drier replacement never requires refrigerant recovery.

D. Filter-drier replacement is considered Type I work.

Question 8.9-3

A normal non-leaking Type II system requires compressor replacement. Which refrigerant-removal rule generally controls before opening the compressor section?

A. The applicable Table 1 evacuation requirement for the appliance or isolated component

B. The Type I 80% recovery rule

C. Always exactly 0 psig because compressor replacement is non-major

D. No refrigerant removal is required when isolation valves exist

Question 8.9-4

A leaking evaporator section cannot reach its normal Table 1 level, but it can be isolated from a non-leaking condensing section. Which current approach is correct?

A. Leave both sections pressurized.

B. Isolate the sections, evacuate the non-leaking section to its normal Table 1 requirement if it will be opened, and evacuate the leaking section to the lowest attainable level not above 0 psig.

C. Vent the evaporator and recover only the condenser.

D. Apply the 5-psig oil-change rule to both sections.

Question 8.9-5

Why is a compressor burnout more than a simple compressor replacement problem?

A. It can contaminate the refrigerant circuit with acid, damaged oil, carbon, moisture, and debris.

B. It automatically changes the appliance to Type III.

C. It eliminates the need for a filter-drier.

D. It proves the refrigerant is reclaimed.

Question 8.9-6

What is a principal function of a liquid-line filter-drier?

A. Increase compressor motor voltage

B. Filter particulate contamination and absorb moisture

C. Create the main refrigeration-cycle pressure rise

D. Store the entire appliance refrigerant charge

Question 8.9-7

A moisture-indicating sight glass changes color. How should the technician interpret the color?

A. Use one universal EPA color rule for every manufacturer.

B. Compare the observed color with the specific manufacturer’s moisture-indicator legend.

C. Assume any color change proves overcharge.

D. Ignore it because moisture indicators do not respond to moisture.

Question 8.9-8

Which current pressure limit is associated specifically with the Section 608 oil-change provision discussed in this module?

A. No higher than 5 psig

B. Exactly 15 psig

C. 25 mm Hg absolute

D. 500 microns

Answers and detailed explanations will be provided in 8.15 - Answers and Explanations.md.

Section Summary

Current Section 608 defines major maintenance, service, or repair by two paths:

Removal of compressor / condenser /
evaporator / auxiliary heat-exchange coil
→ MAJOR

or:

Opening >4 in² of flow area
for >15 minutes
→ MAJOR

For normal Type II major repair:

recover refrigerant
→ applicable Table 1 endpoint
→ verify endpoint
→ open service section

For a leaking system that cannot reach Table 1:

isolate where possible
→ non-leaking section to Table 1
→ leaking section to lowest attainable
→ not above 0 psig

For oil changes:

no higher than 5 psig

Compressor replacement is a major repair and also requires careful contamination control.

A severe burnout can leave:

• Acid.
• Burned oil.
• Carbon.
• Moisture.
• Metal or insulation debris.

The repair therefore involves more than installing a new compressor.

Filter-driers help remove:

particulates
+
moisture

and burnout cleanup may require specially selected filtration according to manufacturer instructions.

Moisture indicators are useful diagnostic tools, but their color scale is manufacturer-specific.

The next section focuses on Type II operational and service safety:

Section 8.10 - Type II Safety.

References

Current EPA and Regulatory Sources

1. Electronic Code of Federal Regulations, 40 CFR § 82.152 - Definitions, verified August 12, 2026.

2. Electronic Code of Federal Regulations, 40 CFR § 82.156 - Proper Evacuation of Refrigerant From Appliances, verified August 12, 2026.

3. U.S. Environmental Protection Agency, Definitions of Section 608 Terms, verified August 12, 2026.

4. U.S. Environmental Protection Agency, Stationary Refrigeration Service Practice Requirements, verified August 12, 2026.

5. U.S. Environmental Protection Agency, Section 608 Test Topics, verified August 12, 2026.