R-1233zd System Pressurizing Methods Quiz

Questions and Answers

What might occur if a strong odor is detected during the recovery process?

The refrigerant is evaporating

The system is working properly

There is a leak in the system

A compressor burn-out may have occurred (correct)

When installing more than one pressure relief valve, they must be installed in series.

False

Approximately how much vapor refrigerant remains in the system after all liquid has been removed from an average 350 ton?

100 lbs

Where is the purge unit located in a low-pressure system?

The top of the condenser Signup and view all the answers

Where do air and other noncondensables collect in a chiller?

At the top section of the condenser Signup and view all the answers

At what pressure will a rupture disk for a low-pressure chiller rupture?

15 psig Signup and view all the answers

Purchases of recycling and recovery equipment used for stationary refrigeration must be reported to the EPA.

False Signup and view all the answers

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

Wait for at least a few minutes to see if the system pressure rises. Signup and view all the answers

What area of a refrigeration system does oil foaming usually occur?

Compressor Signup and view all the answers

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

When the appliance contains over 15 pounds of refrigerant. Signup and view all the answers

What is the best use for testing with soap bubbles?

To pinpoint refrigeration leaks. Signup and view all the answers

What procedure should be followed when changing out a compressor of a system containing 40 pounds of R-404A?

Evacuate the isolated section of the system to 0 psig and if the system pressure does not rise after a few minutes, remove the compressor. Signup and view all the answers

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

3 years Signup and view all the answers

When recovery is first started, at what phase is the refrigerant removed to save recovery time?

Liquid phase Signup and view all the answers

What must be included on the leak inspection records submitted to the EPA when an appliance containing 50 pounds or more of a regulated refrigerant leaks at an annual rate of 125% or more?

Initial verification, verification tests and records of recovered refrigerant from equipment. Signup and view all the answers

What action must an owner of a commercial refrigeration appliance with a charge of 2000 pounds of R-22 take once a leak rate threshold has been exceeded?

Take further action by repairing, retiring, mothballing, or retrofitting the appliance. Signup and view all the answers

When can appliances containing refrigerants be recovered to atmospheric pressure?

When leaks in the appliance make recovery to the prescribed level unattainable. Signup and view all the answers

Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums?

The motor relies on the flow of refrigerant through the compressor for cooling. Signup and view all the answers

What leak rate triggers the EPA requirement that commercial refrigeration systems containing 50 pounds or more of R-22 be repaired?

20% Signup and view all the answers

For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE Standard 15 provided the mechanical ventilation system in the machinery room is run continuously?

R-717 Signup and view all the answers

Industrial process refrigeration units with a 50 pound charge or more with an annualized leak rate ___ of or more must have leaks repaired.

30% Signup and view all the answers

Unless plans are made to replace a system exceeding the maximum leak, repairs must be made in how many days?

30 days Signup and view all the answers

Refrigerants CFC R-12, HCFC R-22, and HFC 134a are all classified as what?

Type A-1 Signup and view all the answers

All Refrigeration & HVAC systems are protected by a?

Pressure relief valve Signup and view all the answers

A refrigerant sensor which will sound an alarm and automatically start a ventilation system in occupied equipment rooms falls under which standard?

ASHRAE Standard 15 Signup and view all the answers

What happens to a refrigerant that is above the saturation temperature?

It remains in a vapor state. Signup and view all the answers

What is the first thing to do when a new system has been assembled (built up), and is ready for testing?

Pressurize with an inert gas and leak check. Signup and view all the answers

Which leak repair category does the EPA define as air-conditioning appliances used to provide cooling in order to control heat and/or humidity in occupied facilities?

Comfort cooling Signup and view all the answers

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

The cylinder should be evacuated. Signup and view all the answers

Which of the following refrigerants is an HFO?

R-1234YF Signup and view all the answers

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

Service valve positions and recovery oil level should be checked, when applicable. Signup and view all the answers

What happens if a supermarket system containing 50 or more pounds of R-22 leaks more than 125% of its full charge in a calendar year?

Submit a report to EPA describing efforts to identify leaks and repair the appliance. Signup and view all the answers

What can be done with the refrigerant trace gas and nitrogen after the leak is found?

Release to the atmosphere. Signup and view all the answers

What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller?

Leak test and repair the chiller. Signup and view all the answers

What is the primary water source for a water-cooled recovery unit's condensing coil?

Local municipal water supply. Signup and view all the answers

Which of the following methods can be used to pressurize an R-1233ZD system for the purpose of opening the system for non-major repairs?

Warming the liquid refrigerant in the system. Signup and view all the answers

Where does refrigerant go to after it leaves the purge unit of a low-pressure centrifugal system?

The evaporator. Signup and view all the answers

The most efficient method of leak checking a charged low-pressure refrigeration unit is to pressurize the system by the use of controlled hot water or heater blankets.

True Signup and view all the answers

What must an owner/operator do if a chiller containing 150 pounds of HCFC refrigerant is leaking above the leak rate threshold?

Repair the appliance so that it leaks below the threshold and conduct the initial verification test. Signup and view all the answers

What EPA required evacuation level must be reached for recovery or recycling equipment manufactured or imported on or after Nov. 15, 1993?

25 mm Hg absolute. Signup and view all the answers

Non-condensables will cause high discharge pressure.

True Signup and view all the answers

What is a moisture indicating sight glass useful for?

Checking for moisture in refrigerant. Signup and view all the answers

Why do gauge set hoses used for field service work have self-sealing connectors or hand valves?

To minimize refrigerant release when hoses are connected and disconnected. Signup and view all the answers

Which refrigerant is commonly associated with low-pressure appliances?

R-123 Signup and view all the answers

What happens during evacuation with large amounts of moisture?

It may be necessary to increase pressure to counteract freezing with gas such as nitrogen. Signup and view all the answers

EPA regulations state that maintenance, service or repair involving the removal of a compressor is a major repair.

True Signup and view all the answers

Study Notes

Recycling and Recovery Equipment

Equipment purchases for recycling and recovery in stationary refrigeration do not need EPA reporting.
Refrigerant recovery should start with the liquid phase for efficiency.
Recycling machines with hermetic compressors can overheat without adequate refrigerant flow for cooling.
Refrigerant must be evacuated properly before transferring to a new cylinder, requiring the cylinder to be evacuated first.

Leak Detection and Repair

Best method for detecting refrigerant leaks is using soap bubbles.
If an appliance leaks refrigerant above specific thresholds (125% of charge per year), detailed records of leak inspections must be submitted to the EPA.
Major repairs, such as compressor replacements or evaporator coil changes, require evacuation of the system to specific vacuum levels.
For commercial refrigeration appliances with 2000 pounds of refrigerant, actions must be taken when leaks exceed designated thresholds.

Refrigeration System Maintenance

To check for moisture in refrigerants, a moisture-indicating sight glass should be used.
Pressure relief valves are crucial and must be installed in parallel.
Condensing coil in water-cooled recovery units relies on local municipal water supply.
It is essential to avoid letting non-condensables accumulate, as they raise discharge pressure.

Regulatory Compliance

EPA regulations outline leak repair requirements based on leak rates and specific refrigerants, e.g., 30% for industrial refrigeration and 20% for commercial units starting in 2019.
Record-keeping for disposed appliances charged between 5 and 50 pounds is required for three years.
Technicians must follow standards for leak testing and evacuation levels based on refrigerant amounts.

Operational Procedures

When performing a major repair, isolate the system and evacuate it to the required vacuum level to prevent complications.
The initial pressure for charging R-134a systems should be around 30 psig to avoid freezing water in heat exchangers.
Utilize dry nitrogen to break vacuum during dehydration processes but ensure a pressure regulator is in place.
Monitor the recovery process, especially if strong odors indicate potential compressor issues.

Refrigerant Management

Refrigerants R-12, R-22, and R-134a are classified as A-1 under safety standards.
R-717 does not require a detector in continuously ventilated equipment rooms, as per ASHRAE standards.
R-123 and R-11 are examples of refrigerants used in low-pressure appliances.
Recovering refrigerants should prioritize minimizing loss of oil during vapor phase recovery.

Safety Measures

ASHRAE Standard 15 mandates the installation of refrigerant sensors and alarms in equipment rooms.
Leaks in high-pressure systems can be indicated by excessive superheat, requiring immediate attention.
Evacuating systems should be done thoroughly to prevent environmental impact and ensure compliance with regulations.

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Description

Test your knowledge on the EPA Type 2 certification requirements for recycling and recovery equipment in stationary refrigeration. This quiz covers key concepts essential for compliance and best practices in handling refrigerants. Perfect for those preparing for certification or wanting to refresh their knowledge.

EPA Type 2 Certification Quiz

Questions and Answers

What might occur if a strong odor is detected during the recovery process?

When installing more than one pressure relief valve, they must be installed in series.

Approximately how much vapor refrigerant remains in the system after all liquid has been removed from an average 350 ton?

Where is the purge unit located in a low-pressure system?

Where do air and other noncondensables collect in a chiller?

At what pressure will a rupture disk for a low-pressure chiller rupture?

Purchases of recycling and recovery equipment used for stationary refrigeration must be reported to the EPA.

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

What area of a refrigeration system does oil foaming usually occur?

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

What is the best use for testing with soap bubbles?

What procedure should be followed when changing out a compressor of a system containing 40 pounds of R-404A?

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

When recovery is first started, at what phase is the refrigerant removed to save recovery time?

What must be included on the leak inspection records submitted to the EPA when an appliance containing 50 pounds or more of a regulated refrigerant leaks at an annual rate of 125% or more?

What action must an owner of a commercial refrigeration appliance with a charge of 2000 pounds of R-22 take once a leak rate threshold has been exceeded?

When can appliances containing refrigerants be recovered to atmospheric pressure?

Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums?

What leak rate triggers the EPA requirement that commercial refrigeration systems containing 50 pounds or more of R-22 be repaired?

For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE Standard 15 provided the mechanical ventilation system in the machinery room is run continuously?

Industrial process refrigeration units with a 50 pound charge or more with an annualized leak rate ___ of or more must have leaks repaired.

Unless plans are made to replace a system exceeding the maximum leak, repairs must be made in how many days?

Refrigerants CFC R-12, HCFC R-22, and HFC 134a are all classified as what?

All Refrigeration & HVAC systems are protected by a?

A refrigerant sensor which will sound an alarm and automatically start a ventilation system in occupied equipment rooms falls under which standard?

What happens to a refrigerant that is above the saturation temperature?

What is the first thing to do when a new system has been assembled (built up), and is ready for testing?

Which leak repair category does the EPA define as air-conditioning appliances used to provide cooling in order to control heat and/or humidity in occupied facilities?

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

Which of the following refrigerants is an HFO?

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

What happens if a supermarket system containing 50 or more pounds of R-22 leaks more than 125% of its full charge in a calendar year?

What can be done with the refrigerant trace gas and nitrogen after the leak is found?

What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller?

What is the primary water source for a water-cooled recovery unit's condensing coil?

Which of the following methods can be used to pressurize an R-1233ZD system for the purpose of opening the system for non-major repairs?

Where does refrigerant go to after it leaves the purge unit of a low-pressure centrifugal system?

The most efficient method of leak checking a charged low-pressure refrigeration unit is to pressurize the system by the use of controlled hot water or heater blankets.

What must an owner/operator do if a chiller containing 150 pounds of HCFC refrigerant is leaking above the leak rate threshold?

What EPA required evacuation level must be reached for recovery or recycling equipment manufactured or imported on or after Nov. 15, 1993?

Non-condensables will cause high discharge pressure.

What is a moisture indicating sight glass useful for?

Why do gauge set hoses used for field service work have self-sealing connectors or hand valves?

Which refrigerant is commonly associated with low-pressure appliances?

What happens during evacuation with large amounts of moisture?

EPA regulations state that maintenance, service or repair involving the removal of a compressor is a major repair.

Study Notes

Recycling and Recovery Equipment

Leak Detection and Repair

Refrigeration System Maintenance

Regulatory Compliance

Operational Procedures

Refrigerant Management

Safety Measures

Studying That Suits You

Description

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