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45 Cards in this Set
- Front
- Back
Technicians servicing small appliances except motor vehicle air conditioning must be certified in refrigerant recovery if... |
they perform sealed system service. |
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The EPA definition of a small appliance includes products (3) ----- in a factory with ----- pounds of refrigerant or less
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manufactured,
charged, and hermetically sealed 5 |
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Persons handling refrigerant during maintenance, service or repair of small appliances must be certified as either a ----- or as a -----.
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Type I Technician
Universal Technician |
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If EPA regulations change after a technician becomes certified, it will be the responsibility of the ----- to comply with any future changes.
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technician
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The sale of CFC's and HCFC's is restricted to -----.
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certified technicians
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Recovery equipment manufactured before November 15, 1993 must be capable of removing ----- of the refrigerant whether or not the compressor is operating or...
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80%
acheive 4 inch vacuum under the conditions of ARI 740 |
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Recovery equipment manufactured after ----- must be certified by an EPA approved testing laboratory as capable or recovering (3) -----
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November 15, 1993
90% if compressor operating 80% no compressor operating 4 inch vacuum under ARI 740 |
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List 2 examples of EPA certified testing laboratories.
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UL (underwriters laboratories)
ETL (edison testing laboratories) |
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All equipment must be equipped with ----- fittings that can be -----, or close -----, when hoses are disconnected to minimize the refrigerant loss
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low loss
manually closed automatically |
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Does the EPA require leaks for small appliances be repaired?
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No, but leaks should be repaired whenever possible
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Before beginning a refrigerant recovery procedure, it is necessary to know...
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the type of refrigerant that is in the system
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If a reclamation facility receives a tank of mixed refrigerant, they may ----- and -----.
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refuse to process the refrigerant
return it at the owner's expense |
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If a reclamation facility agrees to destroy a tank of mixed refrigerant, usually there will be a -----.
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substantial fee.
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Do not mix ----- in a recovery tank.
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refrigerants
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Self-contained (active) recovery equipment has ----- means of removing refrigerant from appliances and is capable of ----- whether or not the compressor is operable
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it's own
reaching the required recovery rates |
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Self Contained recovery equipment stores refrigerant in a -----.
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pressurized recovery tank
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Before operating a self-contained recovery machine, make sure that the -----, and that the recovery tank does not -----.
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tank inlet valve is open
contain excessive non-condensibles (air) |
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Obtaining accurate ----- of refrigerant inside a recovery cylinders is necessary to detect excessive non-condensibles.
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pressure readings
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The only way to read refrigerant pressure accurately is at a -----.
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stable, known temperature.
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Air in a refrigeration system will cause ----- discharge pressures.
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higher
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Regarding purging of non-condensables, follow -----
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the operating instructions supplied by the recovery equipment manufacturer
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All refrigerant recovery equipment should be check for (2)----- on a daily basis.
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oil level and
refrigerant leaks |
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A system-dependent (passive) recovery process for small appliances captures refrigerant in a -----.
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non-pressurized container.
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A non-pressurized container is a container with -----
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a special charcoal activated plastic "bag"
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System-dependent equipment captures refrigerant with the assistance of (3) ----.
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the appliance compressor,
an external heat source, or a vacuum pump. |
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A standard vacuum pump can only be used as a recovery device in combination with a -----.
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non-pressurized container
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With system-dependent recovery equipment, some ----- may be necessary, depending on the ----- of the appliance..
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special procedures
condition |
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When using a system dependent recovery process on an appliance with an operating compressor, run the compressor and recover from -----.
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the high side of the system
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(operating compressor) Usually one access fitting on the high side will be sufficient to reach the required recovery rate, because -----
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the appliance compressor should be capable of pushing the refrigerant to the high side
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If the appliance has a non-operating compressor, access to ----- may be necessary
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both the high side and the low side
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(non-operating compressor) In order to achieve the required recovery efficiency, it will be necessary to ----- to help release trapped refrigerant from the oil.
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take measures such as heating and tapping the compressor several times and/or use a vacuum pump
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Because appliances with non-operating compressors can not always achieve desired evacuation rates uutilizing system-dependent recovery equipment, the EPA requires technicians to have ----- to recover refrigerant from non-operating compressors.
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at least one self-contained recovery device available at the shop
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The exception to the EPA requiring technicians to have a recovery device to for non-operating compressors is -----
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if you are a technician that only works on small appliances.
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System dependent devices may only be used on appliances containing ----- of refrigerant or less.
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15 pounds
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Small appliances are equipped with a straight piece of tubing that can be used to -----.
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install a piercing type access fitting
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When installing an access fitting onto a sealed system, the fitting should be ----- before proceeding with recovery
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leak tested
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It is generally recommended that solderless piercing type valves only be uses on ----- or ----- tubing material.
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copper
aluminum |
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Solderless piercing type valves tend to ----- and should not be left on an appliance as a ----- service fixture.
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leak over time
permanent |
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After installing an access fitting, if you find that the system pressure is 0 psig, do not -----
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begin the recovery process.
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If the appliance is equipped with a defrost heater, such as in a domestic frost-free refrigerator, operating the defrost heater will (2)-----
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help to vaporize any trapped liquid refrigerant and will speed up the recovery process.
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If a strong odor is detected during the recovery process, a ----- has likely occured.
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compressor burn-out
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When recovering refrigerant from a system that experienced a compressor burn-out, watch for -----
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signs of contamination in the oil.
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After recovering refrigerant, if nitrogen is used to flush debris out of the system, the nitrogen may be -----.
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legally vented.
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Refrigerators built before 1950 may have used (3) ----- as refrigerant and ----- be recovered with current recovery devices.
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Methyl formate, Methyl Chloride, or Sulfer Dioxide
should not |
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When filling a graduated charging cylinder with a regulated refrigerant, the refrigerant vapor that is ----- of the cylinder must be recovered.
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vented off the top
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