EPA Test
Appliances manufactured, charged, and hermetically sealed in a factory that contain 5 lbs or less of refrigerant.
A small appliance is defined by EPA as;
can help vaporize any trapped liquid refrigerant during recovery.
Applying heat, with a heat gun, to the compressor;
Vent CFC's or HCFC's since July 1, 1992; Vent HFC's since November 15, 1995; Service, maintain, or dispose of appliances designed to contain refrigerants without being appropriately certified as of November 14, 1994. (It is the responsibility of the final person in the disposal chain to ensure that refrigerant has been removed from appliances before scrapping.)
Clean Air Act
Recycle
Clean 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, is the definition of;
$44,539
How much can a person be fined per day per violation for knowingly releasing a regulated substance that violates the Clean Air Act?
A compressor burnout has likely occurred.
If a strong odor is detected while performing a refrigerant recovery process,
Refrigerant recovery is not required.
If, after installing a fitting for the purpose of recovering the appliance's refrigerant, you find that the system pressure is 0 psig;
1. Triple‐evacuate the system. 2. Install a permanent filter‐drier. 3. Conduct a deep vacuum before recharging
In the event of a burnout of the compressor:
copper or aluminum tubing
It is generally recommended that solderless piercing type valves only be used on
include paraffin‐based oils, napthene‐based oils, and mixed oils (a combination of napthene‐based and paraffin‐based oils).
Mineral, or petroleum, oils
Dec 31, 1995
Montreal Protocol
90% refrigerant or achieving 4 inches of vacuum.
On a system with an operating compressor, recovery equipment must be capable of recovering;
Disposable cylinders
Recover any remaining refrigerant and then render the cylinder useless, then recycle the metal is the proper disposal method for;
will make the reclaimed refrigerants unreclaimable.
Recovering multiple types of refrigerants in the same cylinder;
operating compressor - 90% or 4" of Vacuum non-operating compressor - 80% or 4" of Vacuum Fittings - low loss required Approvals - EPA lab approved
Refrigerant Recovery Requirements for Small Appliances After Nov. 15th 1993
operating compressor - 80% or 4" of Vacuum non-operating compressor - 80% or 4" of Vacuum Fittings - Low loss Required Approvals - none
Refrigerant Recovery Requirements for Small Appliances Before Nov. 15th 1993
November 15, 1993,
Refrigerant Recovery and/or Recycling equipment manufactured after __________ must be certified and labeled by an EPA approved equipment testing organization to meet EPA standards.
5 Years
Reusable refrigerant containers under high-pressure must be hydrostatically tested how often?
(also called HFC‐134a) is the leading replacement option for retrofitting R‐12 systems. The oils used in most R‐134A systems are ester based oils and ester based oils do not mix with other oils. Leak check an R‐134A system using pressurized nitrogen
R‐134A
(which look like bicycle tire air valves) are common on both refrigerant systems and recovery equipment. When using Schrader valves, it is critical to: Check the valve core for bends and cracks Replace damaged Schrader cores to prevent leaks Cap the Schrader ports when not being used to prevent leaks
Schrader valves
which has its own means to draw the refrigerant out of the appliance.
Self‐contained
uses its own power to recover the refrigerant from systems and is capable of reaching the required recovery rates with or without the compressor operating
Self‐contained (active) recovery equipment
As the installation location for a piercing-type access valve.
Small appliances are equipped with a straight piece of tubing (process stub) that is used;
Should not be recovered
Small appliances in recreational vehicles may use refrigerants such as Ammonia, Hydrogen, and water. These refrigerants;
Captures refrigerant into a non-pressurized container.
System-dependent or passive recovery equipment;
15 pounds of refrigerant or less.
System-dependent recovery methods may only be used on appliances containing;
which captures refrigerant with the assistance of components in the appliance from which refrigerant is being recovered
System‐dependent
Type I or Universal certification.
Technicians who perform sealed-system service on small appliances must have;
is the difference in temperature that occurs when a refrigerant evaporates or condenses (changing from vapor to liquid or liquid to vapor) under constant pressure. This means the temperature in the evaporator and the condenser is not constant difference in dew point and bubble point
Temperature Glide
will not dissolve in water.
The chlorine in CFCs and HCFCs;
Reclaiming
To process refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis defines;
Nov 15, 1995
Venting
R-134a R-500 - CFC R-22 - HCFC R-123_ - HCFC R-134a - HFC
What is an example of HFC?
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?
Never energize the compressor.
When a system is in deep vacuum
The refrigerant vapor that is vented off the top of the cylinder must be recovered.
When filling a charging cylinder with a regulated refrigerant;
refrigerant that is vented off the top of the cylinder must be recovered if it is a regulated refrigerant.
When filling a graduated charging cylinder
charge through a pressure regulator. install a relief valve in the line downstream from the pressure regulator.
When pressurizing a system with nitrogen you should;
Place access fitting on both the low and high side of the system.
When using a system-dependent recovery system on an appliance that has a non-operating compressor, the technician should;
Run the compressor and recover from the high side of the system only.
When using a system-dependent recovery system on an appliance that has an operating compressor, the technician should;
it may be necessary to access both the low and high side of the system to achieve the required recovery level and it will speed the recovery. In order to release the trapped refrigerant from the compressor oil, it will be necessary to heat and tap the compressor with a mallet several times and/or use a vacuum pump
When using a system‐dependent recovery process with a non‐operating compressor,
run the compressor and recover from the high side of the system. Normally, one access fitting on the high side will be enough to reach the required recovery rate as the compressor should be able to push the refrigerant to the high side.
When using a system‐dependent recovery process with an operating compressor
A2L
Which ASHRAE classification means slightly flammable?
R-600a
Which HC refrigerant is allowed for use in NEW Domestic Small Appliances?
Air
Which of the following is an example of a non-condensable?
EPA does not require repair, but leaks should be repaired whenever possible.
Which of the following is true regarding refrigerant leaks on small appliances?
R-1234ze
Which of the following refrigerants is an HFO?
80 percent of the refrigerant or achieving 4 inches of vacuum.
With a non-operating system compressor, recovery equipment must be capable of recovering;
c refrigerant contains fluids that boil out at the same temperatures (do not exhibit temperature glide) and act as a single refrigerant. charged as vapor or liquid
azeotropic
contains refrigerants with different boiling points, but that act as one substance when they are in either a liquid or a vapor state. Near‐azeotropic mixtures exhibit temperature glide when they change from vapor to liquid, or vice versa.
blended refrigerant, or near‐azeotropic mixture
occurs when the saturation point in the condenser changes the refrigerant from a vapor to a liquid.
bubble point
liquid
charging blended refrigerants should be done in which state?
occurs when the saturation temperature in the evaporator causes the refrigerant to change from a liquid to a vapor.
dew point
R‐11, R‐12, R‐500 ODP = higher
examples of CFC's
R‐22, R‐123 ODP = Lower
examples of HCFC's
R‐134a ODP = none
examples of HFC's
refers to an oils ability to remain mixed ( not separate at low temp)
low temperature miscibility
is to process refrigerant to the level of new product specifications as determined by chemical analysis. Reclaimed refrigerant must meet the standard set forth in ARI 700 before it can be resold
reclaim
is to remove refrigerant in any condition from a system and store it in an external container without necessarily testing or processing it in any way.
recover
is to clean refrigerant for immediate reuse by separating the oil from the refrigerant and removing moisture and acidity from the refrigerant by use of products like filter driers.
recycle
Nov, 14, 1994
sale restriction
include silicate ester, silicone, neo‐pentyl ester, dibasic acid ester, polyglycols such as polyalkylglycol (PAG), alkyl benzene (AB), and polyolyester (POE). Synthetic oils must be stored in metal containers. The ester oils are generally used with alternative refrigerants and are typically compatible with mineral oils and existing system components.
synthetic oils
captures refrigerant into a non‐pressurized container. The system‐dependent equipment uses the system's compressor, an external heat source, or a vacuum pump to recover the refrigerant.
system‐dependent (passive) recovery process
R-11
what has an ozone depletion potential of 1
hallide torch You can also evacuate the system and pull a vacuum on it. If the system will not hold a vacuum, you have a leak.
when checking for small leaks use a
R-500 R-11 : low pressure appliance R-500 : medium pressure appliance R-503 :Very High Pressure appliance R-410a : high pressure appliance
which refrigerant is used in medium pressure appliance?
is a blend of components that change their composition and saturation temperatures as they evaporate or condense at constant pressure. charged as liquid
zeotropic (or non‐azeotropic) refrigerant