Section 608
Section of the Clean Air Act regulating refrigerants.
Getting Started: Exam Overview
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EPA Section 608 Universal Certification Exam — key terms, tricks & tips
Everything from the course in one searchable place: 192 entries. Use it to review before a practice test or look up a word you forgot.
192 results
ODS
Ozone-Depleting Substances, like CFCs and HCFCs.
Getting Started: Exam Overview
GWP
Global Warming Potential, a measure of greenhouse gases.
Getting Started: Exam Overview
CFCs
Chlorofluorocarbons, potent ODS, largely phased out.
Getting Started: Exam Overview
HCFCs
Hydrochlorofluorocarbons, transitional ODS, being phased out.
Getting Started: Exam Overview
HFCs
Hydrofluorocarbons, high GWP, non-ODS refrigerants.
Getting Started: Exam Overview
Recovery
Removing refrigerant from an appliance for storage.
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Universal Certification
Permits work on all types of regulated appliances.
Getting Started: Exam Overview
Understanding the EPA Section 608 Exam
Remember 'C-H-H' for the main refrigerants: C(FCs), H(CFCs), H(FCs). Like 'See, H-H, we need to protect the atmosphere!'
Getting Started: Exam Overview
Understanding the EPA Section 608 Exam
Memorize the three main categories of refrigerants covered by Section 608: CFCs, HCFCs, and HFCs. The exam often asks about their environmental impact (ODS vs. GWP).
Getting Started: Exam Overview
Understanding the EPA Section 608 Exam
Confusing the environmental impact of CFCs (ozone depletion) with HFCs (global warming).
Getting Started: Exam Overview
Understanding the EPA Section 608 Exam
Believing that only new refrigerants are regulated; older refrigerants like R-12 are still heavily regulated.
Getting Started: Exam Overview
Understanding the EPA Section 608 Exam
Thinking that if an appliance is 'empty' of refrigerant, no recovery is needed before disposal.
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Core Section
Covers universal refrigerant handling principles and regulations.
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Type I Certification
For servicing small appliances containing 5 pounds or less of refrigerant.
Getting Started: Exam Overview
Type II Certification
For servicing high-pressure appliances.
Getting Started: Exam Overview
Type III Certification
For servicing low-pressure appliances.
Getting Started: Exam Overview
Certifying Organization
EPA-approved entity that administers the Section 608 exam.
Getting Started: Exam Overview
Passing Score
70% (18 out of 25 questions) required for each section.
Getting Started: Exam Overview
Exam Structure, Scoring, and Logistics
To remember the passing score, think: 'Seventy percent is the key to your success, my friend!' (70% = 18/25).
Getting Started: Exam Overview
Exam Structure, Scoring, and Logistics
Exam Tip: The EPA 608 exam is a federal certification. While California has additional state-specific regulations (e.g., regarding HFCs), the 608 exam focuses solely on federal EPA requirements. Don't confuse state-specific rules with federal 608 content.
Getting Started: Exam Overview
Exam Structure, Scoring, and Logistics
Not bringing proper government-issued photo identification to the testing center.
Getting Started: Exam Overview
Exam Structure, Scoring, and Logistics
Assuming you need to re-take all sections if you only fail one or two.
Getting Started: Exam Overview
Exam Structure, Scoring, and Logistics
Confusing the federal EPA 608 requirements with specific state regulations.
Getting Started: Exam Overview
Ozone Layer
Stratospheric region absorbing harmful UV radiation.
Core Principles of Refrigeration
Ozone Depletion Potential (ODP)
Measure of a substance's ability to destroy ozone.
Core Principles of Refrigeration
Global Warming Potential (GWP)
Measure of a substance's contribution to global warming.
Core Principles of Refrigeration
CFCs (Chlorofluorocarbons)
Highly ozone-depleting refrigerants, now largely phased out.
Core Principles of Refrigeration
HCFCs (Hydrochlorofluorocarbons)
Less ozone-depleting than CFCs, still being phased out.
Core Principles of Refrigeration
HFCs (Hydrofluorocarbons)
Zero ODP, but high GWP; common current refrigerants.
Core Principles of Refrigeration
Greenhouse Gas
Gas that traps heat in the atmosphere, contributing to warming.
Core Principles of Refrigeration
Ozone Depletion & Environmental Impact
To remember the bad guys: 'CFCs and HCFCs Cause Holes' (in the ozone). 'HFCs Heat the Earth' (global warming).
Core Principles of Refrigeration
Ozone Depletion & Environmental Impact
The exam emphasizes that CFCs and HCFCs have ODP, while HFCs have zero ODP but high GWP. Know that R-11 and R-12 are CFCs, R-22 is an HCFC, and R-134a and R-410A are HFCs. You must know which refrigerants fall into which category.
Core Principles of Refrigeration
Ozone Depletion & Environmental Impact
Confusing ODP (Ozone Depletion Potential) with GWP (Global Warming Potential). They are distinct environmental impacts.
Core Principles of Refrigeration
Ozone Depletion & Environmental Impact
Believing that HFCs are 'environmentally friendly' just because they don't deplete the ozone layer. They still contribute to global warming.
Core Principles of Refrigeration
Ozone Depletion & Environmental Impact
Underestimating the impact of small refrigerant leaks. Even minor releases accumulate and cause significant environmental damage.
Core Principles of Refrigeration
Montreal Protocol
International treaty to phase out ozone-depleting substances.
Core Principles of Refrigeration
Clean Air Act (CAA)
U.S. federal law regulating air pollution, including refrigerants.
Core Principles of Refrigeration
Ozone-Depleting Substance (ODS)
Chemicals like CFCs and HCFCs that harm the ozone layer.
Core Principles of Refrigeration
Refrigerant Recovery
Removing refrigerant from a system and storing it in a container.
Core Principles of Refrigeration
Venting
Releasing refrigerant into the atmosphere; prohibited by EPA.
Core Principles of Refrigeration
Certified Recovery Equipment
EPA-approved machines for removing refrigerants from systems.
Core Principles of Refrigeration
Clean Air Act, Montreal Protocol & 608 Regs
To remember the key regulations: 'R.E.C.O.R.D.' - Recovery, Equipment, Certification, Ozone, Records, Disposal.
Core Principles of Refrigeration
Clean Air Act, Montreal Protocol & 608 Regs
Memorize the maximum daily fine for Section 608 violations: it's a specific, substantial number that often appears on exams. Also know that the Clean Air Act is the *federal* law.
Core Principles of Refrigeration
Clean Air Act, Montreal Protocol & 608 Regs
Assuming older equipment is exempt from recovery regulations.
Core Principles of Refrigeration
Clean Air Act, Montreal Protocol & 608 Regs
Using uncertified or unmaintained recovery equipment.
Core Principles of Refrigeration
Clean Air Act, Montreal Protocol & 608 Regs
Failing to keep detailed records of refrigerant transactions and recovery.
Core Principles of Refrigeration
Refrigeration Cycle
Process of moving heat from one area to another.
Core Principles of Refrigeration
Compressor
Pumps refrigerant, increases its pressure and temperature.
Core Principles of Refrigeration
Condenser
Releases heat, changes high-pressure vapor to liquid.
Core Principles of Refrigeration
Evaporator
Absorbs heat, changes low-pressure liquid to vapor.
Core Principles of Refrigeration
Expansion Device
Reduces refrigerant pressure and temperature.
Core Principles of Refrigeration
Primary Refrigerant
Undergoes phase change to absorb/reject heat.
Core Principles of Refrigeration
Secondary Refrigerant
Transfers heat without undergoing phase change.
Core Principles of Refrigeration
Refrigeration Cycle, Components & Substitutes
Think of a 'C-C-E-E' sandwich: Compressor, Condenser, Expansion device, Evaporator. The refrigerant cycles through them!
Core Principles of Refrigeration
Refrigeration Cycle, Components & Substitutes
The exam often tests the sequence of the refrigeration cycle and the state of the refrigerant (liquid/vapor, high/low pressure/temperature) at different points. Memorize the 'four main components' and their order.
Core Principles of Refrigeration
Refrigeration Cycle, Components & Substitutes
Confusing the roles of the condenser and evaporator (condenser rejects heat, evaporator absorbs it).
Core Principles of Refrigeration
Refrigeration Cycle, Components & Substitutes
Incorrectly identifying the state of refrigerant (liquid vs. vapor, high vs. low pressure) at different points in the cycle.
Core Principles of Refrigeration
Refrigeration Cycle, Components & Substitutes
Forgetting that the expansion device causes a pressure drop, not a pressure increase.
Core Principles of Refrigeration
Leak Detection
Methods used to find refrigerant escaping a system.
Core Principles of Refrigeration
Recovery Cylinder
An approved tank for storing recovered refrigerant.
Core Principles of Refrigeration
Refrigerant Recycling
Cleaning refrigerant for reuse by separating oil and removing contaminants.
Core Principles of Refrigeration
Refrigerant Reclaiming
Processing refrigerant to virgin specifications by an EPA-certified reclaimer.
Core Principles of Refrigeration
80% Fill Rule
Recovery cylinders must not be filled beyond 80% of their capacity by weight.
Core Principles of Refrigeration
ARI 700
Standard for refrigerant purity that reclaimed refrigerants must meet.
Core Principles of Refrigeration
Leak Detection, Recovery Techniques & Safety
For 'Recovery, Recycling, Reclaiming,' think 'R-R-R': Remove (Recovery), Reuse (Recycling), Restore (Reclaiming to virgin spec).
Core Principles of Refrigeration
Leak Detection, Recovery Techniques & Safety
The EPA Section 608 exam frequently asks about the maximum fill level for recovery cylinders. Remember the '80% by weight' rule. Also, know the difference between recovery, recycling, and reclaiming, especially that only reclaimed refrigerant can be sold to other users.
Core Principles of Refrigeration
Leak Detection, Recovery Techniques & Safety
Venting refrigerant instead of recovering it, which is illegal and harmful to the environment.
Core Principles of Refrigeration
Leak Detection, Recovery Techniques & Safety
Overfilling recovery cylinders, leading to dangerous pressure buildup and potential rupture.
Core Principles of Refrigeration
Leak Detection, Recovery Techniques & Safety
Mixing different refrigerants in the same recovery cylinder, which contaminates the refrigerant and makes it unusable.
Core Principles of Refrigeration
Leak Detection, Recovery Techniques & Safety
Failing to wear appropriate PPE, risking frostbite or chemical burns from refrigerant contact.
Core Principles of Refrigeration
Small Appliance
Factory-sealed appliance with 5 lbs or less of refrigerant.
Type I: Small Appliances
Refrigerant Charge
Total amount of refrigerant contained within a system.
Type I: Small Appliances
Hermetically Sealed
System designed to prevent gas leakage; permanently sealed.
Type I: Small Appliances
Passive Recovery
Recovery method using system pressure or tank cooling.
Type I: Small Appliances
Active Recovery
Recovery method using a dedicated recovery machine.
Type I: Small Appliances
Recovery Efficiency
Percentage of refrigerant removed from a system.
Type I: Small Appliances
DOT-Approved Cylinder
Recovery cylinder meeting Department of Transportation standards.
Type I: Small Appliances
Type I Refrigerant Requirements & Recovery
Remember '80-O, 90-NO' for recovery efficiency: 80% if Operating, 90% if NOt operating.
Type I: Small Appliances
Type I Refrigerant Requirements & Recovery
The exam often tests the specific recovery percentages: 80% when the compressor is operating, 90% when it's not. Also, remember the 5-pound refrigerant limit for Type I appliances.
Type I: Small Appliances
Type I Refrigerant Requirements & Recovery
Assuming small appliances don't require recovery because of their size.
Type I: Small Appliances
Type I Refrigerant Requirements & Recovery
Not checking the refrigerant charge to confirm Type I classification.
Type I: Small Appliances
Type I Refrigerant Requirements & Recovery
Venting small amounts of refrigerant, believing it's negligible or allowed.
Type I: Small Appliances
Type I Refrigerant Requirements & Recovery
Using non-DOT approved containers for recovered refrigerant.
Type I: Small Appliances
Self-contained recovery
Uses its own compressor to pull and condense refrigerant.
Type I: Small Appliances
System-dependent recovery
Relies on the appliance's compressor to push refrigerant.
Type I: Small Appliances
Low-loss fittings
Hose connections designed to minimize refrigerant release during connection/disconnection.
Type I: Small Appliances
Non-condensables
Gases (like air) that do not condense at refrigerant operating pressures/temperatures.
Type I: Small Appliances
4 inches Hg vacuum
Required recovery level for small appliances with non-operating compressors.
Type I: Small Appliances
90% refrigerant removal
Alternative recovery level for small appliances with operating compressors.
Type I: Small Appliances
Small Appliance Recovery Devices & Practices
To remember the vacuum level: 'Four inches of Mercury for small appliances, whether it's dead or alive!' (referring to the compressor).
Type I: Small Appliances
Small Appliance Recovery Devices & Practices
For small appliances with an operating compressor, the EPA requires either 90% of the refrigerant to be removed OR the system to be evacuated to 4 inches of mercury vacuum. Memorize both options.
Type I: Small Appliances
Small Appliance Recovery Devices & Practices
Using a system-dependent recovery unit on an appliance with a non-operating compressor.
Type I: Small Appliances
Small Appliance Recovery Devices & Practices
Venting non-condensable gases to the atmosphere instead of recovering them.
Type I: Small Appliances
Small Appliance Recovery Devices & Practices
Not achieving the required vacuum level before disconnecting hoses.
Type I: Small Appliances
PPE
Personal Protective Equipment; gear for safety.
Type I: Small Appliances
Frostbite
Tissue damage from extreme cold, like liquid refrigerant.
Type I: Small Appliances
Asphyxiation
Lack of oxygen due to displacement by refrigerant vapors.
Type I: Small Appliances
Ventilation
Circulation of fresh air to remove vapors.
Type I: Small Appliances
Lockout/Tagout
Procedures to prevent accidental power re-energization.
Type I: Small Appliances
Chemical-resistant gloves
Gloves protecting against chemical contact and frostbite.
Type I: Small Appliances
Safety Data Sheet (SDS)
Document with hazard and safety info for chemicals.
Type I: Small Appliances
Safety Procedures for Small Appliances
FROST: F-Flush with water, R-Remove clothing, O-Oxygen if needed, S-Seek medical, T-Take care!
Type I: Small Appliances
Safety Procedures for Small Appliances
The exam often emphasizes the importance of wearing safety glasses and chemical-resistant gloves when handling refrigerants to prevent eye and skin injuries. Memorize these two key PPE items.
Type I: Small Appliances
Safety Procedures for Small Appliances
Forgetting to wear safety glasses or gloves when connecting/disconnecting hoses.
Type I: Small Appliances
Safety Procedures for Small Appliances
Working in poorly ventilated areas when recovering refrigerant.
Type I: Small Appliances
Safety Procedures for Small Appliances
Not verifying power is disconnected before touching electrical components.
Type I: Small Appliances
Type I Appliance
A small appliance containing 5 pounds or less of refrigerant.
Type I: Small Appliances
Safe Harbor Rule
EPA rule stating leak repair is not mandatory for Type I appliances.
Type I: Small Appliances
Electronic Leak Detector
Device used to detect refrigerant leaks with high sensitivity.
Type I: Small Appliances
Soap Bubbles
Method using soapy water to visually identify refrigerant leaks.
Type I: Small Appliances
UV Dye
Fluorescent substance added to refrigerant to locate leaks with UV light.
Type I: Small Appliances
Leak Repair for Type I Appliances
Think of a 'Small' (Type I) boat in a 'Safe Harbor' – it's not 'Mandatory' to fix its tiny leaks, but it's still a good idea!
Type I: Small Appliances
Leak Repair for Type I Appliances
Memorize: For Type I appliances, the EPA does NOT require leak repair. This is a common trick question on the exam; look for 'Type I' or 'small appliance' and 'mandatory repair'.
Type I: Small Appliances
Leak Repair for Type I Appliances
Assuming leak repair is always mandatory, regardless of appliance type.
Type I: Small Appliances
Leak Repair for Type I Appliances
Not explaining the environmental and efficiency benefits of repair to customers.
Type I: Small Appliances
Leak Repair for Type I Appliances
Failing to recover refrigerant before disposing of a leaking Type I appliance.
Type I: Small Appliances
Type II Refrigerant
High-pressure refrigerants like R-22, R-134a, R-410A.
Type II: High-Pressure Systems
High-Pressure Appliance
System using Type II refrigerants, e.g., AC units.
Type II: High-Pressure Systems
Inches of Mercury Vacuum
Unit of measurement for pressure below atmospheric.
Type II: High-Pressure Systems
0 psig
Pressure equal to atmospheric pressure.
Type II: High-Pressure Systems
Type II Refrigerant & Recovery Requirements
Think of 'Two Tens' for Type II: If the compressor's dead on a big system (>5 lbs), you need to pull a TEN-inch vacuum!
Type II: High-Pressure Systems
Type II Refrigerant & Recovery Requirements
The exam often tests specific recovery vacuum levels. Remember: for Type II appliances with > 5 lbs refrigerant and a non-operating compressor, the required vacuum is 10 inches of mercury. For <= 5 lbs with an operating compressor, it's 0 psig.
Type II: High-Pressure Systems
Type II Refrigerant & Recovery Requirements
Not checking the system's refrigerant charge before determining recovery requirements.
Type II: High-Pressure Systems
Type II Refrigerant & Recovery Requirements
Failing to achieve the required vacuum level, leading to refrigerant release.
Type II: High-Pressure Systems
Type II Refrigerant & Recovery Requirements
Using a recovery cylinder that is not properly rated or is overfilled.
Type II: High-Pressure Systems
Active Recovery Device
A unit with its own compressor for refrigerant recovery.
Type II: High-Pressure Systems
Deep Vacuum
A very low pressure, typically 500 microns or less.
Type II: High-Pressure Systems
Evacuation
Process of removing non-condensables and moisture.
Type II: High-Pressure Systems
Micron Gauge
Measures vacuum levels in microns of mercury.
Type II: High-Pressure Systems
Triple Evacuation
Multiple vacuum cycles with nitrogen breaks to remove moisture.
Type II: High-Pressure Systems
High-Pressure Recovery Devices & Evacuation
VACUUM: V for Valve open, A for Attach hoses, C for Compressor on, U for Unit running, U for Ultimate vacuum, M for Monitor gauges.
Type II: High-Pressure Systems
High-Pressure Recovery Devices & Evacuation
The exam often asks about the target vacuum level for evacuation. Remember that for most high-pressure systems, the goal is 500 microns or less, and it must hold steady.
Type II: High-Pressure Systems
High-Pressure Recovery Devices & Evacuation
Not using a micron gauge to accurately measure vacuum levels.
Type II: High-Pressure Systems
High-Pressure Recovery Devices & Evacuation
Stopping evacuation too soon, leaving moisture and non-condensables.
Type II: High-Pressure Systems
High-Pressure Recovery Devices & Evacuation
Not purging non-condensables from the recovery unit or hoses.
Type II: High-Pressure Systems
High-Pressure Refrigerant
Refrigerants operating at high pressures, like R-22 and R-410A.
Type II: High-Pressure Systems
Leak Rate
Percentage of refrigerant lost from a system annually.
Type II: High-Pressure Systems
Comfort Cooling
HVAC systems for human comfort, not process cooling.
Type II: High-Pressure Systems
Industrial Process Refrigeration (IPR)
Refrigeration used in industrial processes, often critical.
Type II: High-Pressure Systems
Verification Test
Follow-up test to confirm a leak repair was successful.
Type II: High-Pressure Systems
Retrofit/Retirement Plan
Plan for replacing or retiring a chronically leaking appliance.
Type II: High-Pressure Systems
Safety & Leak Repair in High-Pressure Systems
Think of the '3-D' rule for leaks: Detect, Document, and Don't Delay!
Type II: High-Pressure Systems
Safety & Leak Repair in High-Pressure Systems
Memorize the leak rate thresholds: Comfort Cooling (50+ lbs) is 10%, Commercial/Industrial Process Refrigeration (IPR, 50+ lbs) is 30%, and all other high-pressure appliances (50+ lbs) is 20%. Also, know the 30-day repair and verification timeframe.
Type II: High-Pressure Systems
Safety & Leak Repair in High-Pressure Systems
Failing to wear proper PPE, especially eye protection, when handling high-pressure refrigerants.
Type II: High-Pressure Systems
Safety & Leak Repair in High-Pressure Systems
Neglecting to perform a thorough leak verification after a repair, leading to repeat service calls.
Type II: High-Pressure Systems
Safety & Leak Repair in High-Pressure Systems
Overfilling recovery cylinders, which can cause dangerous pressure buildup and rupture.
Type II: High-Pressure Systems
Non-System Recovery
Uses a dedicated, self-contained recovery unit.
Type II: High-Pressure Systems
High-Pressure System
Systems using refrigerants with high operating pressures.
Type II: High-Pressure Systems
System-Dependent vs. Non-System Recovery
Think of 'Dependent' as 'Dependent on the system's compressor' and 'Non-System' as 'Not dependent on the system, uses its own machine!'
Type II: High-Pressure Systems
System-Dependent vs. Non-System Recovery
The exam often tests the 15-pound threshold for system-dependent recovery. Remember that system-dependent recovery is limited to appliances with 15 pounds or less of refrigerant and an operating compressor.
Type II: High-Pressure Systems
System-Dependent vs. Non-System Recovery
Attempting system-dependent recovery on a system with a non-functional compressor.
Type II: High-Pressure Systems
System-Dependent vs. Non-System Recovery
Using system-dependent recovery for systems containing more than 15 pounds of refrigerant.
Type II: High-Pressure Systems
System-Dependent vs. Non-System Recovery
Not checking the recovery cylinder's capacity before starting recovery, leading to overfilling.
Type II: High-Pressure Systems
Low-Pressure System
Operates with refrigerants boiling below 32°F at atmospheric pressure.
Type III: Low-Pressure Systems
R-11
A CFC refrigerant commonly used in low-pressure chillers, ozone-depleting.
Type III: Low-Pressure Systems
R-123
An HCFC refrigerant, a common low-pressure alternative to R-11.
Type III: Low-Pressure Systems
25 inches Hg vacuum
Required recovery level for most low-pressure systems.
Type III: Low-Pressure Systems
15 inches Hg vacuum
Required recovery level for 50+ lbs systems with non-operating compressor.
Type III: Low-Pressure Systems
80% fill capacity
Maximum allowed fill level for recovery cylinders by weight.
Type III: Low-Pressure Systems
Type III Refrigerant & Recovery Requirements
For low-pressure, think 'Low-pressure, High-vacuum.' The deeper the vacuum, the better the recovery. Remember 25 for most, 15 for big ones with a broken heart (compressor off).
Type III: Low-Pressure Systems
Type III Refrigerant & Recovery Requirements
For Type III, remember the specific vacuum levels for systems over and under 50 lbs, and whether the compressor is operating. The numbers 25 inches Hg and 15 inches Hg are key to memorize.
Type III: Low-Pressure Systems
Type III Refrigerant & Recovery Requirements
Failing to check the system's refrigerant type before recovery, leading to contamination.
Type III: Low-Pressure Systems
Type III Refrigerant & Recovery Requirements
Not reaching the required vacuum level, resulting in illegal refrigerant release.
Type III: Low-Pressure Systems
Type III Refrigerant & Recovery Requirements
Overfilling recovery cylinders, creating a dangerous explosion hazard.
Type III: Low-Pressure Systems
Baking Out
Heating a system during evacuation to vaporize and remove moisture.
Type III: Low-Pressure Systems
Break Vacuum
Introducing dry nitrogen into a system under vacuum to aid moisture removal.
Type III: Low-Pressure Systems
Water-Cooled Condenser
Component in recovery units that uses water to cool and condense refrigerant.
Type III: Low-Pressure Systems
Low-Pressure Recovery Devices & Evacuation
Think of a 'LOW' pressure system as a 'LOW' temperature system where water is a 'LOW'sy problem. You need to 'HEAT' it up to get the 'WATER' out!
Type III: Low-Pressure Systems
Low-Pressure Recovery Devices & Evacuation
For Type III systems, the EPA requires evacuation to 25 inches of Hg vacuum or less when performing a major repair. Remember that water can freeze at low pressures, causing damage.
Type III: Low-Pressure Systems
Low-Pressure Recovery Devices & Evacuation
Not heating the system during evacuation, leaving moisture behind.
Type III: Low-Pressure Systems
Low-Pressure Recovery Devices & Evacuation
Using an inaccurate vacuum gauge or connecting it too close to the pump.
Type III: Low-Pressure Systems
Low-Pressure Recovery Devices & Evacuation
Failing to purge charging hoses, introducing air into the system during charging.
Type III: Low-Pressure Systems
Rupture Disc
Safety device on low-pressure chillers, typically set to 15 psig.
Type III: Low-Pressure Systems
10 psig
Maximum pressure for nitrogen leak testing low-pressure systems.
Type III: Low-Pressure Systems
Slugging
Liquid refrigerant entering the compressor, causing damage.
Type III: Low-Pressure Systems
IPR
Industrial Process Refrigeration, EPA leak rate threshold is 30% for systems 50 lbs+.
Type III: Low-Pressure Systems
30 Days
Timeframe to repair leaks exceeding EPA thresholds.
Type III: Low-Pressure Systems
Safety, Leak Repair & Charging Low-Pressure Systems
For Low-Pressure leaks, remember 'Ten Pounds Safely' – 10 psig is the max for nitrogen, and the rupture disc pops at 15 psig.
Type III: Low-Pressure Systems
Safety, Leak Repair & Charging Low-Pressure Systems
Memorize the maximum pressure for leak testing low-pressure systems: 10 psig. Also, know the rupture disc setting is typically 15 psig.
Type III: Low-Pressure Systems
Safety, Leak Repair & Charging Low-Pressure Systems
Pressurizing a low-pressure system with nitrogen above 10 psig, risking damage to components like the rupture disc.
Type III: Low-Pressure Systems
Safety, Leak Repair & Charging Low-Pressure Systems
Failing to pull a deep vacuum before charging, leading to contamination and inefficient operation.
Type III: Low-Pressure Systems
Safety, Leak Repair & Charging Low-Pressure Systems
Introducing liquid refrigerant too quickly into the system, causing compressor slugging.
Type III: Low-Pressure Systems
Purge Unit
Device removing non-condensables from low-pressure systems.
Type III: Low-Pressure Systems
Head Pressure
Pressure in the condenser; elevated by non-condensables.
Type III: Low-Pressure Systems
Float Valve
Component in purge unit that separates liquid refrigerant from gas.
Type III: Low-Pressure Systems
Oil Separator
Device that minimizes refrigerant oil loss during purging.
Type III: Low-Pressure Systems
Purge Units and Their Operation
Think of a 'PURGE' unit as a 'Purger' for 'Unwanted Residue, Gases, and Emissions.'
Type III: Low-Pressure Systems
Purge Units and Their Operation
On the exam, be prepared to identify the primary function of a purge unit and what excessive operation indicates. Keywords to spot include 'non-condensables,' 'low-pressure chiller,' and 'excessive purge run time.' Remember that non-condensables increase head pressure.
Type III: Low-Pressure Systems
Purge Units and Their Operation
Confusing a purge unit with a recovery machine; they have different primary functions.
Type III: Low-Pressure Systems
Purge Units and Their Operation
Ignoring a continuously running purge unit, which indicates a serious system leak.
Type III: Low-Pressure Systems
Purge Units and Their Operation
Believing purge units are used on all types of refrigeration systems (they are primarily for low-pressure systems).
Type III: Low-Pressure Systems