CORE
These refrigerants will not damage stratospheric ozone, but have a high GWP
What are HFCs?
When using a system-dependent recovery system on an appliance that has a non-operating compressor, the technician should do this.
What is "Place access fitting on both the low and high side of the system?"
When dehydrating a system, it should be evacuated to this minimum level.
What is 500 Microns?
A low-pressure chiller used for comfort cooling must be repaired if it has an annual leak rate of this percentage of the total charge.
What is 10%?
This is cleaning refrigerant for reuse by separating the oil from the refrigerant and removing moisture from the refrigerant by passing it through one or more filter driers.
What is Recycling?
On a system with an operating compressor, recovery equipment must be capable of recovering to this level.
What is "90% refrigerant or achieving 4 inches of vacuum?"
A new split system should be checked for leaks by doing this.
What is, "pressurizing the system with a few ounces of system refrigerant and an inert gas (Nitrogen)?"
In a low-pressure chiller, air and other non-condensables collect here.
What is "at the top section of the condenser?"
This is the molecule found in CFCs and HCFCs that depletes ozone.
What is Chlorine?
Technicians who perform sealed-system service on small appliances must have this certification.
What is Type I or Universal certification?
This can be done with a refrigerant trace gas and nitrogen mixture after a system leak is found.
What is "Release to the atmosphere (Vent)?"
After all the liquid has been removed from an average 350-ton, low-pressure appliance, approximately this much vapor refrigerant remains in the system.
What is 100 lbs?
This is the EPA's program that identifies refrigerants with lower overall risks to human health and the environment.
What is the Significant New Alternatives Policy (SNAP) Program?
Recovery equipment must be certified by this place.
What is an EPA-approved testing laboratory?
This happens to a refrigerant that is heated above the saturation temperature.
What is "remains in the vapor state?"
Because a low-pressure system operates below atmospheric pressure (in a vacuum), this will happen if there is a leak.
What is "air and moisture will enter the system?"
This ASHRAE classification means slightly flammable?
What is A2L?
When using a system-dependent recovery system on an appliance that has an operating compressor, the technician should do this.
What is "Run the compressor and recover from the high side of the system only?"
Leaks must be repaired on industrial process and refrigeration units with a 50-pound charge or greater when the annualized leak rate reaches this percentage or more.
What is 30%?
This best describes the refrigerant recovery process from an R-123 system.
What is, "Start with liquid removal and then switch over to vapor recovery?"
These typse of refrigerants have the highest Ozone Depletion Potential.
What are CFCs?
This can help vaporize any trapped liquid refrigerant during recovery.
What is, "Applying heat, with a heat gun, to the compressor?"
The equipment owners/operators must include this in recovered refrigerant records for equipment with refrigerant charges that range from 5 to 50 pounds?
What is, "The quantity of refrigerant (by type) added or recovered from disposed appliances in each calendar month and quantity of refrigerant (by type) sent for reclamation or destruction?"
This is the EPA-required evacuation level for recovery or recycling equipment used on low-pressure systems.
What is "25 mm of Hg absolute?"
A single chlorine atom can destroy this many ozone molecules.
What is 100,000?
This type of recovery equipment has its own means to recover refrigerant.
What is, "Self-contained or active recovery equipment?"
Unless plans are made to replace a system with a leak rate that exceeds the maximum leak rate, repairs must be made within this amount of time.
What is 30 days?
This is the most efficient method of leak checking a charged low-pressure refrigeration unit.
What is "pressurize the system using controlled hot water or heater blankets?"
This refrigerant has a GWP closest to "1"?
What is R-1233zd?
This HC refrigerant is allowed for use in NEW Domestic Small Appliances.
What is R-600A?
These conditions allow for a system to be opened and repaired without recovering the refrigerant to the required vacuum level.
What is "A system with a large leak and internal pressure of 0 psig?"
This organization establishes the refrigerant safety group standard.
What is ASHRAE?
This international agreement (Treaty) regulated the production and use of CFCs, HCFCs, halons, methyl chloroform and carbon tetrachloride.
What is The Montreal Protocol?
With a non-operating system compressor, recovery equipment must be capable of recovering to this level.
What is, "80 percent of the refrigerant or achieving 4 inches of vacuum?"
A high-pressure appliance containing less than 200 lbs. of an HCFC or HFC refrigerant must be evacuated (recovered) to this level.
What is "0 inches of vacuum?"
To repair a chiller operating with R-22, the technician should have this certification.
What is Type II certification?
Reusable refrigerant containers under high-pressure must be hydrostatically tested this often.
What is Every 5 Years?
If, after installing a fitting for the purpose of recovering the appliance's refrigerant, you find that the system pressure is 0 psig you should do this.
What is Nothing? Refrigerant recovery is not required
A high-pressure appliance containing 210 lbs. of R-407C refrigerant must be evacuated (recovered) to this level.
What is 10 inches of vacuum?
Under ASHRAE Standard 34, R-134a is classified as this type of refrigerant.
What is A1?
A refrigerant cylinder designed to hold recovered refrigerant has this color scheme.
What is a Grey Body and Yellow Top?
If regulations change after the technician becomes certified then the technician is responsible for this.
What is, "complying with any changes to the regulations?"
When an appliance containing 50 pounds or more of a regulated refrigerant leaks refrigerant at an annual rate of 125% or more, this must be included on the leak inspections records.
What is "Initial verification, verification tests and records of recovered refrigerant from equipment?"
This is where refrigerant is added to a low-pressure system during the charging process.
What is, "The lowest access point on the system such as the evaporator charging valve?"
R-1234ze is this type of refrigerant.
What is an HFO?
Small appliances in recreational vehicles may use refrigerants such as Ammonia, Hydrogen, and water. You do not need to do this to these refrigerants.
What is recover?
All HVAC/R systems must be protected by one of these.
What is a pressure relief?
When leak testing a low-pressure chiller, the maximum pressure to use is this.
What is 10 psig?
These types of refrigerant contain no chlorine
What are HFCs?
EPA does not require leak repair on these systems, but leaks should be repaired whenever possible.
What are small appliances?
EPA regulations require that all Industrial Process Refrigeration (IPR) systems containing more than 50 pounds of refrigerant MUST be repaired when the annual leak rate exceeds this percentage.
What is 30%?
When installing more than one, pressure relief valves must be installed in this arrangement.
What is "in parallel with each other?"