10.16 - Final Quick Reference

Module: Universal Review and Mock Examinations
Purpose: Final compact review for EPA Section 608 Universal certification preparation
Covers: Core, Type I, Type II, and Type III high-priority facts from Modules 1–10
Current regulatory verification basis: August 14, 2026
Use: Final rapid review only. If a rule or condition is unclear, return to the detailed course section rather than memorizing an isolated number.

1. Universal Master Table

Universal Certification Relationship

CORE
+
TYPE I
+
TYPE II
+
TYPE III
→ UNIVERSAL

Core is the common examination section. It is not a fourth appliance type.

2. Classification First

Before selecting a recovery rule, evacuation value, or service procedure:

1. IDENTIFY THE APPLIANCE
2. CHECK MVAC / MVAC-LIKE STATUS
3. CHECK THE COMPLETE SMALL-APPLIANCE DEFINITION
4. IF NOT TYPE I, DETERMINE PRESSURE CATEGORY
5. IDENTIFY THE SERVICE CONDITION
6. THEN SELECT THE RULE

Fast Classification

Factory manufactured
+
factory charged
+
factory hermetically sealed
+
≤5 lb refrigerant
→ TYPE I

Medium / high / very-high pressure
→ TYPE II

Low pressure
→ TYPE III

Type I + Type II + Type III
→ UNIVERSAL

3. Core Final Summary

Environmental and Regulatory

Clean Air Act Section 608
→ U.S. stationary refrigerant-management program

Montreal Protocol
→ international ozone-depleting-substance control framework

Stratospheric ozone
→ protects against harmful UV

CFC / HCFC
→ contain chlorine
→ nonzero ODP

HFC / HFO
→ no chlorine
→ zero ODP

Zero ODP does not mean zero GWP, zero flammability, zero toxicity, or permission to vent.

Venting

DO NOT knowingly vent covered refrigerant
during maintenance, service, repair, or disposal

Limited permitted releases include properly defined de minimis releases associated with good-faith recovery and specific exempt substitutes/end uses.

Nitrogen alone
→ may be released after proper testing

Nitrogen + covered refrigerant
→ do not intentionally vent the mixture

Recover, Recycle, Reclaim

RECOVER
→ REMOVE + STORE

RECYCLE
→ CLEAN FOR PERMITTED REUSE

RECLAIM
→ REPROCESS + VERIFY PURITY

Recovery Equipment

SYSTEM-DEPENDENT
→ depends on appliance components and/or refrigerant pressure

SELF-CONTAINED
→ has its own independent recovery means

FULL CHARGE >15 lb
→ ordinary system-dependent equipment prohibited
→ unless permanently attached as a pump-out unit

Recovery Cylinders

RECOVERY CYLINDER
→ refillable

DISPOSABLE CYLINDER
→ do not refill
→ do not use for recovery

Use a scale and do not overfill.

Project exam-preparation concept:

80% maximum fill concept

Any lower manufacturer, transportation, or refrigerant-specific limit controls actual field use.

Pressure and Vacuum

psig
→ referenced to atmosphere

psia
→ referenced to perfect vacuum

0 psig
≠
0 psia

in. Hg vacuum
→ larger number = deeper vacuum

mm Hg absolute / microns
→ smaller number = deeper vacuum

Nitrogen Safety

Use:

DRY NITROGEN
+
PRESSURE REGULATOR
+
DOWNSTREAM RELIEF PROTECTION

Never use oxygen or compressed air for refrigerant-system pressure testing.

Section 608 Versus Section 609

SECTION 608
→ stationary appliances

SECTION 609
→ MVAC service for consideration

Universal Section 608 certification does not replace Section 609 certification for paid MVAC service.

Vehicle-mounted cargo refrigeration is not automatically an MVAC.

4. Type I Final Summary

Small-Appliance Definition

All four conditions are required:

FACTORY MANUFACTURED
+
FACTORY CHARGED
+
FACTORY HERMETICALLY SEALED
+
5 lb OR LESS

≤5 lb ALONE
≠
TYPE I

Type I Recovery Requirements

Remember:

THE DATE APPLIES TO THE RECOVERY EQUIPMENT
NOT THE APPLIANCE

THE COMPRESSOR CONDITION REFERS TO
THE APPLIANCE COMPRESSOR

Operating Compressor

OPERATING COMPRESSOR
→ compressor assists refrigerant movement
→ high-side recovery emphasis

Failed Compressor

FAILED COMPRESSOR
→ no compressor pumping assistance
→ high + low access as needed

Controlled heat may help release trapped refrigerant.

Never use an open flame.

Access Fittings

PROCESS STUB
→ tubing

PIERCING / SOLDERLESS ACCESS FITTING
→ temporary service access

Current Type I exam emphasis:

REMOVE TEMPORARY SOLDERLESS FITTING
AFTER SERVICE
→ restore / reseal tubing
→ leak check

Disposal

Final processor:

RECOVER REMAINING REFRIGERANT
OR
VERIFY ACCEPTABLE PRIOR RECOVERY

Prior-recovery signed statement:

NAME
+
ADDRESS
+
DATE

Required final-processor statements/contracts:

KEEP 3 YEARS

A sticker alone is not sufficient prior-recovery verification.

5. Type II Final Summary

Type II Scope

MEDIUM
+
HIGH
+
VERY HIGH PRESSURE
→ TYPE II

Pressure Categories

High-pressure appliance classification is not the same as the high side of a refrigeration system.

Recovery Sequence

PREPARE SYSTEM + CYLINDER
→ RECOVER ACCESSIBLE BULK LIQUID FIRST
→ RECOVER REMAINING VAPOR
→ REACH REQUIRED ENDPOINT
→ ISOLATE
→ CHECK PRESSURE REBOUND

Pressure rebound can come from:

• Refrigerant evaporating from cold components.
• Refrigerant leaving compressor oil.
• Refrigerant trapped in isolated sections.

FIRST LOW PRESSURE READING
≠
AUTOMATICALLY COMPLETE

System-Dependent Restriction

FULL CHARGE >15 lb
→ no ordinary system-dependent recovery equipment
→ unless permanently attached pump-out unit

The rule uses full charge, not the amount remaining after a leak.

Type II Evacuation Table

Recovery Equipment Manufactured On or After November 15, 1993

Recovery Equipment Manufactured Before November 15, 1993

Major Maintenance, Service, or Repair

Major if removing:

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

Also major if:

OPENING >4 in² OF FLOW AREA
+
OPEN >15 MINUTES

FILTER-DRIER REPLACEMENT
≠
AUTOMATICALLY MAJOR

Special Service-Pressure Concepts

When all regulatory conditions are satisfied:

QUALIFYING NON-MAJOR OPENING
→ NO HIGHER THAN 0 psig

LEAK PREVENTS NORMAL TABLE 1 ENDPOINT
→ isolate where possible
→ non-leaking portion to Table 1
→ leaking portion to lowest attainable
→ not above 0 psig

SPECIAL OIL-CHANGE PROVISION
→ NO HIGHER THAN 5 psig

Current Section 608 ODS Leak-Repair Triggers

For qualifying appliances containing 50 lb or more of applicable ozone-depleting refrigerant:

35% / 15%
→ HISTORICAL
→ NOT THE CURRENT SECTION 608 TABLE

Do not confuse the Section 608 ODS framework with the separate current AIM Act HFC leak-repair framework.

Type II Safety

RECIPROCATING COMPRESSOR
+ CLOSED DISCHARGE SERVICE VALVE
→ DO NOT ENERGIZE

HERMETIC COMPRESSOR
+ DEEP VACUUM
→ DO NOT ENERGIZE

HIGH HEAD PRESSURE
→ diagnose cause
→ do not bypass safety control

Verify pressure ratings for recovery machines, hoses, gauges, cylinders, and fittings on very-high-pressure systems.

6. Type III Final Summary

Low-Pressure Classification

<45 psia at 104°F
→ LOW PRESSURE
→ TYPE III

Many low-pressure chillers operate below atmospheric pressure.

Therefore:

AIR + MOISTURE
→ CAN LEAK INTO THE SYSTEM

Purge Unit

PURGE UNIT
→ removes noncondensables
→ minimizes refrigerant loss

Frequent purge operation can indicate air infiltration.

The purge unit is not the recovery machine for the entire chiller charge.

Leak Testing

Type III exam-preparation value:

10 psig
→ low-pressure leak-test maximum

This is an exam-preparation maximum, not a universal target pressure for every chiller.

Recovery Sequence

LIQUID FIRST
→ VAPOR SECOND
→ REQUIRED ENDPOINT
→ ISOLATE + CHECK REBOUND

No visible liquid does not mean recovery is complete.

Freeze Prevention

As refrigerant pressure falls:

SATURATION TEMPERATURE FALLS
→ WATER CAN FREEZE

During normal deep recovery:

CIRCULATE / MANAGE WATER AS REQUIRED

If a tube leak is suspected under the Type III exam procedure:

DRAIN EVAPORATOR WATER SIDE
+
DRAIN CONDENSER WATER SIDE
BEFORE RECOVERY

Refrigerant in Oil

Refrigerant can remain dissolved in oil and come out of solution as pressure falls.

Traditional Type III exam value:

130°F
→ oil-heating value before oil removal

Current oil-change pressure provision:

NO HIGHER THAN 5 psig

Charging

From a deep vacuum:

VAPOR FIRST
→ pressure rises
→ saturation temperature rises
→ freeze risk decreases
→ LIQUID LATER when approved

For blends, distinguish:

REMOVE BLEND FROM SOURCE AS LIQUID

from:

INTRODUCE VAPOR FIRST INTO
A DEEPLY EVACUATED LOW-PRESSURE CHILLER

Both can be correct in the same controlled charging procedure.

Type III Evacuation Requirement

25 mm Hg absolute

for the current normal low-pressure Table 1 refrigerant-removal endpoint.

25 mm Hg absolute
≠
25 in. Hg vacuum

Traditional Type III Exam Values

10 psig
→ leak-test maximum

10 psig
→ recovery-unit high-pressure cutout

15 psig
→ low-pressure recovery-vessel rupture-disc value

130°F
→ oil heating

5 psig
→ current oil-change opening provision

25 mm Hg absolute
→ normal low-pressure evacuation endpoint

Do not generalize the 15 psig recovery-vessel rupture-disc value into a universal chiller pressure-relief rating.

Type III Safety

REFRIGERANT MONITOR
→ refrigerant concentration

OXYGEN MONITOR
→ oxygen concentration

MACHINERY ROOM
≠
AUTOMATICALLY OSHA CONFINED SPACE

Before water-side service:

STOP / ISOLATE ENERGY
→ RELIEVE PRESSURE
→ VERIFY SAFE CONDITION

A stopped pump does not prove that water-side pressure is zero.

7. Highest-Priority Numbers

Memorize every number with its concept, condition, and unit.

The Three Charge Numbers Most Often Confused

5 lb
→ TYPE I SMALL-APPLIANCE DEFINITION

15 lb
→ SYSTEM-DEPENDENT RECOVERY-EQUIPMENT RULE

50 lb
→ CURRENT SECTION 608 ODS LEAK-REPAIR APPLICABILITY

200 lb
→ TYPE II EVACUATION-TABLE BOUNDARY

8. Current Leak-Rule Separation

Section 608 ODS Framework

For qualifying appliances:

≥50 lb applicable ODS refrigerant

Current trigger rates:

IPR 30%
COMMERCIAL 20%
COMFORT 10%
OTHER 10%

Separate AIM Act HFC Framework

The project also identifies a separate current federal HFC leak-repair framework under 40 CFR Part 84.

Do not combine the two programs.

Key distinction:

SECTION 608 ODS RULE
≠
AIM ACT HFC RULE

When an exam question identifies the regulatory framework, use the conditions belonging to that framework.

9. Commonly Confused Terms

10. Highest-Priority Universal Exam Traps

Trap 1 - Correct Number, Wrong Rule

15 lb
50 lb
200 lb

are not interchangeable.

Always identify what the number controls.

Trap 2 - Correct Rule, Wrong Appliance

A Type I recovery percentage is not a Type II evacuation requirement.

A Type III vacuum value is not a Type II value.

Trap 3 - Charge Alone Determines Type I

≤5 lb
≠
automatically small appliance

All four small-appliance conditions are required.

Trap 4 - November 15, 1993 Means Appliance Date

Wrong.

For the recovery requirements emphasized in this course:

NOV. 15, 1993
→ RECOVERY / RECYCLING EQUIPMENT DATE

Trap 5 - Historical Leak Rates Used as Current

35% / 15%
→ historical

Current Section 608 ODS trigger table:

30% / 20% / 10%

Trap 6 - High Side Means Type II

Wrong.

HIGH SIDE
→ refrigeration-cycle location

TYPE II
→ appliance certification category

Trap 7 - Low Side Means Type III

Wrong.

A Type II system also has a low side.

Trap 8 - Failed Compressor Removes Recovery Requirement

Wrong.

The recovery method changes; the recovery requirement remains.

Trap 9 - No Visible Liquid Means Recovery Complete

Wrong.

Vapor, dissolved refrigerant, or trapped refrigerant can remain.

Trap 10 - Deep-Vacuum Type III Charging Starts With Liquid

Wrong.

VAPOR FIRST
→ LIQUID LATER

Trap 11 - 25 mm Hg Absolute Equals 25 in. Hg Vacuum

Wrong.

The units and reference points are different.

Trap 12 - Purge Unit Is a Recovery Machine

Wrong.

The purge unit removes noncondensables while minimizing refrigerant loss.

Trap 13 - Provider Policy Is EPA Law

Wrong.

Time limits, attempt counts, waiting periods, software, and credential-delivery procedures are provider-specific.

Trap 14 - Universal Includes Section 609

Wrong.

Universal is:

TYPE I + TYPE II + TYPE III

Paid ordinary MVAC service still requires the applicable Section 609 credential.

Trap 15 - Good Practice Automatically Equals the Federal Minimum

A manufacturer or technical service procedure may require a deeper vacuum or additional steps beyond the Section 608 refrigerant-removal endpoint.

Know what the question is asking.

11. Five-Step Question Method

For every question:

1. WHAT APPLIANCE / SECTION IS THIS?
2. WHAT CONDITION CONTROLS?
3. WHAT RULE OR PHYSICAL PRINCIPLE APPLIES?
4. WHAT UNIT / DATE / THRESHOLD IS USED?
5. WHICH CHOICE ANSWERS THE EXACT QUESTION?

Watch especially for:

NOT
EXCEPT
MINIMUM
MAXIMUM
FIRST
LAST
CURRENT
HISTORICAL
REQUIRED
PROHIBITED

A distractor is often a true statement that belongs to a different appliance, condition, date, or regulatory program.

12. Final Exam-Day Reading Checklist

Immediately before the official examination, read this section once.

Knowledge

• I can classify Type I, Type II, and Type III equipment before choosing a procedure.
• I know the complete small-appliance definition.
• I know the 5 / 15 / 50 / 200 lb distinctions.
• I know the Type I 80% / 90% / 4 in. Hg vacuum rules.
• I know the Type II current evacuation table.
• I know the Type III 25 mm Hg absolute requirement.
• I know current Section 608 ODS leak rates are 30% / 20% / 10%.
• I can separate current rules from historical values.
• I can separate EPA regulations from provider policies.
• I have no unresolved high-priority safety or regulatory errors.

Test Setup

• I have confirmed the certifying organization is currently EPA approved.
• I have read the provider’s current candidate instructions.
• I know the current time limit and scoring / section-credit method.
• I know what materials, calculator, P-T chart, or scratch materials are permitted.
• Identification is ready.
• Account login works.
• Camera, microphone, device, and internet are ready if remotely proctored.
• The testing area is quiet and compliant.
• Unauthorized notes and devices are removed.

During the Exam

• Read the entire stem before looking for a familiar number.
• Identify the appliance or certification section.
• Mark NOT, EXCEPT, MINIMUM, MAXIMUM, FIRST, and similar controlling words mentally.
• Check units.
• Eliminate choices that belong to another Type or another condition.
• Do not spend excessive time on one question.
• Return to uncertain questions if time remains.
• Change an answer only for a specific technical or reading reason.
• Do not use outside help or unauthorized materials.

Final Reminder

CLASSIFY FIRST
→ FIND THE CONTROLLING CONDITION
→ APPLY THE CORRECT RULE
→ CHECK THE UNIT
→ ANSWER ONLY WHAT WAS ASKED

13. Project Readiness Standard

Before the official Universal attempt:

CORE ≥22/25
TYPE I ≥22/25
TYPE II ≥22/25
TYPE III ≥22/25

on:

TWO SEPARATE
CLOSED-BOOK
CUMULATIVE ATTEMPTS

and:

ZERO UNRESOLVED P1 ERRORS

This is the project’s preparation standard, not the federal passing-score rule.

If any section has not met the target, return to:

• 10.10 - Error Analysis and Remediation.md
• 10.13 - Optional Remediation Examination.md
• 10.14 - Official Examination Readiness Checklist.md

14. Final Universal Memory Map

CORE
→ environment + regulation + refrigerants
→ recovery + cylinders + evacuation + safety

TYPE I
→ small appliance
→ all four definition conditions
→ 80 / 90 / 4
→ operating vs failed compressor

TYPE II
→ medium + high + very high
→ 45 / 170 / 355
→ liquid first where practical
→ 15 / 50 / 200 are different rules
→ 0 / 4 / 10 / 15 evacuation values

TYPE III
→ low pressure
→ air + moisture can leak IN
→ purge
→ liquid first / vapor second recovery
→ freeze prevention
→ vapor-first charging
→ 25 mm Hg absolute

UNIVERSAL
→ CORE + TYPE I + TYPE II + TYPE III

FINAL EXAM HABIT
→ CLASSIFY
→ CONDITION
→ RULE
→ UNIT
→ ANSWER

References

Current Regulatory and EPA Sources

1. U.S. Environmental Protection Agency, Section 608 Technician Certification Requirements, project verification August 14, 2026.

2. U.S. Environmental Protection Agency, Section 608 Test Topics, project verification August 14, 2026.

3. U.S. Environmental Protection Agency, Required Level of Evacuation of Appliances, project verification August 14, 2026.

4. U.S. Environmental Protection Agency, Stationary Refrigeration Service Practice Requirements, project verification August 14, 2026.

5. U.S. Environmental Protection Agency, Stationary Refrigeration Leak Repair Requirements, project verification August 14, 2026.

6. Electronic Code of Federal Regulations, 40 CFR Part 82, Subpart F - Recycling and Emissions Reduction, project verification August 14, 2026.

Module 10 Review Files

7. 10.1 - Universal Certification Comparison Tables

8. 10.2 - High-Priority Numbers and Thresholds

9. 10.3 - Commonly Confused Terms

10. 10.4 - Core Memorization Sheet

11. 10.5 - Type I Memorization Sheet

12. 10.6 - Type II Memorization Sheet

13. 10.7 - Type III Memorization Sheet

14. 10.10 - Error Analysis and Remediation

15. 10.15 - Official Examination Readiness Checklist