EPA Type 2 Refrigerant Concepts
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Questions and Answers

What should you look for when inspecting a hermetic system known to be leaking?

Traces of oil

Which gas should be used to help locate a leak when a trace gas becomes necessary?

Nitrogen with a trace amount of system design refrigerant

What leak rate requires repair for a chiller containing 50 pounds or more of R 123 starting in 2019?

10%

How many days do you have to repair a leak in a comfort cooling appliance containing 50 pounds or more of R 22?

<p>30 days</p> Signup and view all the answers

How long must owners and operators keep records of leak inspections and verification tests?

<p>3 years</p> Signup and view all the answers

What happens to any remaining vapor after refrigerant liquid has been recovered from an appliance?

<p>Removed by the recovery system</p> Signup and view all the answers

Why could a recycling or recovery machine with a hermetic compressor overheat during a deep vacuum?

<p>The motor relies on the flow of refrigerant through the compressor for cooling</p> Signup and view all the answers

What should be done before transferring refrigerant to an empty cylinder?

<p>The cylinder should be evacuated first</p> Signup and view all the answers

What steps should be taken before using a recovery unit to remove a charge?

<p>Check service valve positions and recovery oil level</p> Signup and view all the answers

When should refrigerant be removed from the condenser outlet?

<p>When the condenser is below the receiver</p> Signup and view all the answers

What should you do when servicing a unit with a receiver storage tank?

<p>Refrigerant should be pumped down to and isolated in the receiver</p> Signup and view all the answers

How long must an HVAC servicing company keep records for each disposed appliance with a charge of between 5 and 50 pounds?

<p>3 years</p> Signup and view all the answers

Which of the following statements about recycling and recovery equipment is false?

<p>Training is not necessary for operating recovery equipment</p> Signup and view all the answers

Which part of a belt-driven non-hermetic compressor is most likely to leak if not used for several months?

<p>Rotating shaft seal</p> Signup and view all the answers

What should be done after reaching the required recovery vacuum on an appliance?

<p>Wait for at least a few minutes to see if the system pressure rises</p> Signup and view all the answers

Before making a major repair, to what level must a technician evacuate an appliance containing more than 200 pounds of R 410 A?

<p>10 inches of HG vacuum</p> Signup and view all the answers

When can appliances containing refrigerants be recovered to atmospheric pressure?

<p>When leaks in the appliance make recovery to the prescribed level unattainable</p> Signup and view all the answers

Which repairs would be considered major under EPA regulations?

<p>Replacement of evaporator coil, compressor, condenser, and auxiliary heat exchanger</p> Signup and view all the answers

When is it against EPA regulations to use system dependent recovery equipment?

<p>When the appliance contains over 15 pounds of refrigerant</p> Signup and view all the answers

What is the evaporation temperature of R 134A at 0 psi G?

<p>-15°F</p> Signup and view all the answers

What is a reason to take an oil sample in a hermetic refrigeration system?

<p>The unit has had a compressor burn out</p> Signup and view all the answers

What are refrigeration and air-conditioning compressor heaters used for?

<p>To reduce the amount of refrigerant in the oil</p> Signup and view all the answers

When dehydrating by the triple evacuation method, what is required to use dry nitrogen?

<p>A pressure regulator</p> Signup and view all the answers

What must every refrigeration system be protected by?

<p>A pressure relief device</p> Signup and view all the answers

How can pressure relief valves only be installed?

<p>In parallel</p> Signup and view all the answers

What phase is the refrigerant removed to save recovery time when starting recovery?

<p>Liquid phase</p> Signup and view all the answers

Where must you connect the hose to recover liquid refrigerant?

<p>The liquid line</p> Signup and view all the answers

Recovering refrigerant from a system in vapor phase will minimize the loss of what?

<p>OIL</p> Signup and view all the answers

How can you speed up the removal of the refrigerant charge from a system?

<p>Cooling the recovery cylinder to lower its pressure</p> Signup and view all the answers

What is the state of the refrigerant leaving the receiver in a refrigeration system?

<p>High pressure subcooled liquid</p> Signup and view all the answers

What is the best method to charge a system with both an air-cooled condenser and evaporator with a charge of 80 pounds?

<p>Liquid charge through the liquid line service valve</p> Signup and view all the answers

How would you remove moisture from refrigerant in a system?

<p>Use a filter dryer</p> Signup and view all the answers

For what refrigerant is an equipment room refrigerant detector not required under ASHRAE standard 15?

<p>R 717</p> Signup and view all the answers

When could a reciprocating compressor be damaged if energized?

<p>When the discharge service valve is closed</p> Signup and view all the answers

At what leak rate do EPA regulations require that leaking commercial and industrial process refrigeration be repaired?

<p>30%</p> Signup and view all the answers

What is the component directly following the condenser in a refrigeration system using a TXV?

<p>The receiver</p> Signup and view all the answers

What can you do with the refrigerant recovered from an air conditioning system held in a refillable cylinder?

<p>Can probably be charged back into the system</p> Signup and view all the answers

Recovering refrigerant in the vapor phase will minimize the loss of what?

<p>OIL</p> Signup and view all the answers

Where should recovery first occur when an air-cooled condenser is on the roof and the evaporator is on the first floor?

<p>From the liquid line entering the evaporator</p> Signup and view all the answers

What can happen when using a large vacuum pump to evacuate a system?

<p>Water in system can freeze</p> Signup and view all the answers

When can appliances containing CFCs be evacuated to atmospheric pressure?

<p>When leaks make evacuation to the prescribed level unattainable</p> Signup and view all the answers

What may recovered refrigerant contain?

<p>Acids, moisture, oil</p> Signup and view all the answers

To start liquid charging off an R 410 A refrigeration system with a risk of freezing, what pressure should you begin with?

<p>110 PSIG</p> Signup and view all the answers

What could happen to the hermetic refrigeration compressor motor windings when under a deep vacuum?

<p>Could be damaged if energized</p> Signup and view all the answers

What should be used to remove ice from a sight glass?

<p>Isopropyl Alcohol</p> Signup and view all the answers

What should you visually look for when inspecting a hermetic system known to be leaking?

<p>Traces of oil</p> Signup and view all the answers

Which refrigerants can be mixed?

<p>None</p> Signup and view all the answers

What is an indicator of a leak in a high-pressure system?

<p>Excessive superheat</p> Signup and view all the answers

Starting in 2019, what is the maximum leak rate for chillers containing more than 50 pounds of ozone-depleting refrigerant that must be repaired?

<p>10% of the charge per year</p> Signup and view all the answers

For what refrigerant is an equipment room refrigerant detector not required under ASHRAE standard 15?

<p>R 717</p> Signup and view all the answers

Study Notes

Traces of Oil

  • Inspect hermetic systems for leaks by looking for traces of oil.

Leak Detection

  • Use nitrogen containing a trace of refrigerant to locate leaks when necessary.

EPA Leak Rate

  • Starting in 2019, chiller systems with over 50 pounds of R 123 must be repaired if the leak rate exceeds 10%.

Repair Timeline

  • For comfort cooling appliances with R 22 leaking above threshold, repairs must occur within 30 days unless an extension is granted.

Record Keeping

  • Owners of appliances with over 50 pounds of HCFC refrigerant must maintain leak inspection records for 3 years.

Refrigerant Recovery

  • After recovering refrigerant liquid, any remaining vapor is removed by the recovery system.

Compressor Cooling

  • A hermetic compressor may overheat during a deep vacuum, as it depends on refrigerant flow for cooling.

Transferring Refrigerant

  • Before transferring refrigerant to an empty cylinder, first evacuate the cylinder.

Pre-Use Checks

  • Check service valve positions and recovery oil levels before operating recovery units.

Refrigerant Removal Timing

  • Remove refrigerant from the condenser outlet when it is located below the receiver.

Refrigerant Isolation

  • For systems with a receiver, refrigerant should be pumped down and isolated during servicing.

Appliance Disposal Records

  • HVAC servicing companies must retain records for 3 years for disposed appliances charged with 5 to 50 pounds of refrigerant.

Equipment Reporting

  • Purchases of recycling and recovery equipment must be reported to the EPA.

Compressor Seals

  • The rotating shaft seal is commonly the leak source in non-hermetic compressors that have not been used for a while.

Post-Recovery Pressure Check

  • After achieving the required recovery vacuum, wait several minutes to monitor system pressure changes.

Evacuation Level Requirement

  • Major repairs on appliances with over 200 pounds of R 410A require evacuation to a vacuum of 10 inches of HG.

Atmospheric Pressure Recovery

  • Appliances with leaks that prevent recovery to the required level can be evacuated to atmospheric pressure.

Major Repairs

  • Major repairs include replacement of the evaporator coil, compressor, condenser, and auxiliary heat exchanger.

System Dependency

  • System-dependent recovery equipment cannot be used when the appliance contains over 15 pounds of refrigerant.

R 134A Evaporation Temperature

  • The evaporation temperature of R 134A at 0 psi G is -15°F.

Oil Sample Collection

  • Take oil samples when a compressor has burned out to assess system integrity.

Compressor Heaters

  • Heaters in refrigeration compressors help reduce the refrigerant amount in the oil.

Dehydrating Method

  • A pressure regulator is required when using dry nitrogen for the triple evacuation dehydration method.

Protection Requirement

  • All refrigeration systems must include a pressure relief device for safety.

Installation of Relief Valves

  • Pressure relief valves must be installed in parallel within systems.

Continuous Vapor Removal

  • Recovering vapor phase refrigerant minimizes oil loss during recovery processes.

Recovery Speed

  • Speed up refrigerant removal by cooling the recovery cylinder to lower its pressure.

Refrigerant State Leaving Receiver

  • The refrigerant exiting the receiver is typically in a high-pressure subcooled liquid state.

Charging Method

  • For an 80-pound charge with both air-cooled condenser and evaporator, liquid charge should be introduced through the liquid line service valve.

Moisture Removal Technique

  • Use a filter dryer to eliminate moisture from refrigerant in the system.

ASHRAE Standard Exemption

  • Under ASHRAE Standard 15, a refrigerant detector is not required for R 717 in ventilated equipment rooms.

Compressor Damage Risk

  • Energizing a reciprocating compressor with a closed discharge service valve can cause damage.

Industrial Leak Repair Requirement

  • EPA mandates 30% leak repair for commercial and industrial refrigeration systems.

Receiver Component Position

  • The component following the condenser in a TXV refrigeration system is the receiver.

Recovered Refrigerant Reuse

  • Refrigerant recovered for condenser replacement can often be reused in the system.

Refrigerant Loss in Vapor Phase

  • Recovering refrigerant in vapor phase conserves oil loss.

Initial Recovery Location

  • Start refrigerant recovery from the liquid line entering the evaporator when dealing with roof-mounted condensers.

Vacuum Pump Caution

  • Using large vacuum pumps may lead to freezing of water in the system.

CFC Appliances Atmospheric Pressure

  • CFC-containing appliances can be evacuated to atmospheric pressure when leaks affect evacuation levels.

Recovered Refrigerant Composition

  • Recoveries may include acids, moisture, and oil.

Initial Charge Pressure

  • Begin liquid charging of R 410A systems under risk of freezing at approximately 110 PSIG.

Deep Vacuum Motor Risk

  • Under deep vacuum, a hermetic compressor motor winding may sustain damage when energized.

Ice Removal Method

  • Isopropyl alcohol effectively removes ice from sight glasses.

Leak Visual Inspection

  • Check for traces of oil when inspecting hermetic systems for leaks.

Refrigerant Mixing

  • No refrigerants should be mixed as per regulations.

High-Pressure Leak Indicator

  • Excessive superheat is a significant indicator of leaks in high-pressure systems.

Chiller Leak Rate Repair Requirement

  • Regulations necessitate the repair of chillers leaking 10% of their charge annually or more.

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Description

Test your knowledge on key concepts related to EPA Type 2 refrigerants. This quiz includes definitions and terms important for understanding leak detection and system inspections. Perfect for those preparing for EPA certification.

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