EPA
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| type I technician | show 🗑
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| type II technican | show 🗑
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| show | dispose of low pressure appliances.
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| show | repair both low & high pressure equipment & small appliances.
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| show | blue & measures low pressure (psi) & vacuum (inches hg.)
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| the high pressure gauge is | show 🗑
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| show | center ports, (usually yellow hose) connected to a recovery device
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| show | low loss fittings that will minimize refrigerant loss when hoses are disconnected.
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| show | three oxygen atoms
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| show | ultraviolet radiation & helps maintain stable temperatures
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| show | crop loss, increase in eye diseases, skin cancer, reduce marine life, deforestation, increased ground level Ozone
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| CFC'S & HCFC'S | show 🗑
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| show | 100,000 Ozone molecules
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| show | break down into compounds that dissolve in water,so they don't rain out of the atmosphere
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| Ozone depletion potential is a measurement of CFC's & | show 🗑
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| show | ozone depletion potential
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| show | CFCs = chlorine fluorine carbon
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| R-22,123 are? | show 🗑
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| show | hydrogen fluorine carbon
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| after Nov. 14, 1994 | show 🗑
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| show | refrigerant recovery & or recycling eqpt. must be certified & labeled by an EPA & you must evacuate to 10' prior to major maint. for 40 pd. system
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| since Nov. 15, 1995 | show 🗑
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| show | violation to vent CFC's or HCFC's
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| Dec. 31, 1995 | show 🗑
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| violation to dispose of a disposable cylinder with out first | show 🗑
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| show | opening or disposing of an appliance
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| show | low loss fittings, & register the device with the EPA
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| show | a release of the mixture
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| to recover is to | show 🗑
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| show | clean refrigerant for reuse by separating the oil from the refrigerant & removing moisture from the refrigeratn by passing it through one or more filter driers
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| show | process refrigerant to a level equal to new (virgin) product spec as determined by chem analysis.
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| show | ARI 700 before it can be resold
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| system dependent | show 🗑
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| self contained | show 🗑
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| show | ozone friendly, will not mix with most refrigerant oils,when leak testing an R-134a system to use pressurized nitrogen, R-134a refrigerant systems are ESTERS.
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| show | a three part blend, are used with a synthetic alkylbenzene lubricant
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| show | hygroscopic, have a high affinity for water.
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| show | a range of boiling points or condensing points through out the evaporator & condenser respectively
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| azeotropic blend | show 🗑
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| show | the mixture may be impossible to reclaim. recover only one type of refrigerant into a recovery cylinder.
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| show | a compressor burn out has likely occurred, watch for signs of contamination in the oil
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| show | trap any debris that may damage the new compressor
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| long hoses will cause pressure drop, and | show 🗑
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| the lower the ambient temp the | show 🗑
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| use an electronic or ultrasonic leak detector to | show 🗑
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| show | remove water & water vapor,
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| if moisture is allowed to remain in an operating refrigeration system what will occur | show 🗑
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| show | following proper recovery procedures & attaining the mandated vacuum level
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| show | 2 ports, one liquid & one vapor
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| show | 80%, An explosion
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| Refillable cylinder must be hydrostatically tested and | show 🗑
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| show | DOT approved
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| show | Yellow top & gray bodies
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| show | Charge thru a pressure regulator & insert a relief value in the downstream line from the pressure regulator.
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| show | Installed in series, replaced if corrosion build up is found.
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| show | Oxygen or compressed air, can cause an explosion.
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| To determine the safe pressure for leak testing,check | show 🗑
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| Schrader values, it's critical to inspect for | show 🗑
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| show | An open flame,don't cut or braze refrigerant line unit.
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| SCABA is required for | show 🗑
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| Inhaling refrigerant vapors or mist may cause | show 🗑
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| Never expose R-22 or R-12 to open flames orrr glowing hot metal surfaces | show 🗑
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| show | Must be capable of removing 80% of the refrigerant, whether or not compressor is operating, or achieve 4 inch vacuum under the conditions of ARI 740
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| Recovery eqpt. Manufactured after Nov. 15, 1993 | show 🗑
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| The only way to read refrigerant pressure accurately is | show 🗑
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| Air in a refrigeration system will cause | show 🗑
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| show | Run the compressor & recover from the high side of the system
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| show | Access to both the low & high side of the system may be necessary.
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| System dependent recovery devices may only be used on appliances containing | show 🗑
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| Refrigerators built before 1950 may have used Methyl Formate , Methyl Chloride, or Sulfur Dioxide as refrigerant and should | show 🗑
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| Small appliances used in campers or other recreational vehicles may use refrigerants such as Ammonia, Hydrogen, or Water, and therefore should | show 🗑
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| When filling a graduated charging cylinder with a regulated refrigerant, the refrigerant vapor that is vented off the top of the cylinder | show 🗑
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| After the installation of any type of system, | show 🗑
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| show | An electronic or ultrasonic leak detector. Once the general area of the leak is located the use of soap bubbles will pinpoint the leak.l
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| A refrigeration unit using open compressor that has not been used in several months is likely to | show 🗑
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| show | 15%5
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| show | 35%
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| show | Frequently check & change both the oil & filter on a recycling machine.
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| Before using a recovery unit you should always check the service value position, oil level of the recovery unit and | show 🗑
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| Technicians working with multiple refrigerants, before recovering & or recycling a different refrigerant, must purge the recover/recycle eqpt. by recovering as much of the first refrigerant as possible, change the filter, & evacuate. | show 🗑
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| After recovery, refrigerant may be returned to the appliance from which it was removed or to another appliance owned by the same person without being recycled or reclaimed, unless the appliance is an MVAC like appliance. | show 🗑
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| System Dependant recovery eqpt. Can't be used on appliance containing more than | show 🗑
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| The most common refrigerant used in residential split air conditioning system was | show 🗑
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| show | Need to be evacuated.The filter drier should be replaced anytime a system is open for servicing Strong odor detected, compressor burn out, watch for signs of contamination in the oil.
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| show | Refrigerant in the oil will cause oil foaming in the compressor at start up.
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| When evacuating a vapor compression system, the vacuum pump should be capable of pulling 500 microns (29.90''hg) of vacuum. | show 🗑
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| The use of a large vacuum pump could cause trapped water to freeze. | show 🗑
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| show | None condensables will cause higher discharge pressures.
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| Where there is a risk of freezing, liquid charging of an R-12 refrigerant system should begin with vapor from a vacuum level to a pressure of approx. 33psig. | show 🗑
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| show | Refrigerant CFC-12,CFC-11, & HFC-134a are categorized as A-1
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| show | Must not be installed in series
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| Never energize a reciprocating compressor if the discharge service value is closed | show 🗑
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| Because a low pressure system operates below atmospheric pressure (in a vacuum), | show 🗑
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| show | The use of controlled hot water or heater blankets or use nitrogen to increase pressure.
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| When pressurizing a system, don't exceed 10 psig | show 🗑
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| When leak testing a water box | show 🗑
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| show | Use a hydrostatic tube test kid.
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| Systems with open drive compressors | show 🗑
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| show | Opening the system for non major repairs
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| show | Any maintenance, service or repair involving the removal: compressor, condenser, evaporator or any auxiliary heat exchanger coil.
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| EPA regulations require that all comfort cooling appliances containing more than 50lbs. of refrigerant be repaired when | show 🗑
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| show | The annual leak rate exceeds 35%
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| A recovery unit's high pressure cut out is set for 10 psig when evacuating the refrigerant from a low pressure chiller and | show 🗑
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| show | Liquid removal & is followed by vapor recovery.
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| A substantial amount of vapor will remain in the appliance after all liquid is removed. | show 🗑
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| When recovering refrigerant, the system water pumps and | show 🗑
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| The ASHRAE guideline 3-1996 states that if the pressure in a system rises from 1 mm Hg to a level above 2.5 mm Hg during vacuum testing, | show 🗑
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| A temp of 130°F should be attained when removing oil from a low pressure system | show 🗑
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| show | Refrigerant is added thru the lowest access point on the system,the evaporator charging value.
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| Introducing liquid refrigerant into a deep vacuum will cause the refrigerant to boil and | show 🗑
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| Before charging with liquid an R-11 refrigerant system requires a vapor pressure of 26.9" Hg. vacuum, or | show 🗑
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| Refrigerant Recovery & or recycling equipment manufacturered after November 15,1993 must be certified & labeled by an EPA approved equipment testing organization to meet EPA standards. | show 🗑
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| show | 25 inches Hg
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| Using recovery or recycling equipment manufactured or imported on or After Nov.15,1993 | show 🗑
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| Once the required vacuum has been achieved, the technician should wait for a few minutes & monitor the system pressure. | show 🗑
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| show | Evacuated to the lowest attainable level prior to a major repair.
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| The use of large vacuum pump could cause trapped water to freeze. | show 🗑
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| If strong odor is detected during the recovery process, a compressor burn out may have occurred. | show 🗑
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| Because chillers using refrigerant such as CFC-11 & HCFC-123 operate below atmospheric pressure, they require a purge unit. | show 🗑
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| A centrifugal chiller's purge condensing unit takes its suction from the top of the condenser, removes air & other none condensable from the system, & returns refrigerant to the evaporator. | show 🗑
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| show | Excessive moisture collection in the purge unit can indicate tube leakage.
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| show | The typical design burst pressure for a rupture disc is 15 pisg.
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| ASHRAE standard 15 requires a refrigerant monitor that will sound an alarm & automatically start a ventilation system in equipment rooms before the refrigerant concentration reaches the threshold limit value time weighted average. | show 🗑
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| show | R-123 is coded grouped as B-1
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| All refrigeration system must be protected by a pressure relief valve (s) | show 🗑
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Created by:
Rafael Leon