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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.

The EPA definition of a small appliance includes products (3) ----- in a factory with ----- pounds of refrigerant or less
charged, and
hermetically sealed
Persons handling refrigerant during maintenance, service or repair of small appliances must be certified as either a ----- or as a -----.
Type I Technician
Universal Technician
If EPA regulations change after a technician becomes certified, it will be the responsibility of the ----- to comply with any future changes.
The sale of CFC's and HCFC's is restricted to -----.
certified technicians
Recovery equipment manufactured before November 15, 1993 must be capable of removing ----- of the refrigerant whether or not the compressor is operating or...

acheive 4 inch vacuum under the conditions of ARI 740
Recovery equipment manufactured after ----- must be certified by an EPA approved testing laboratory as capable or recovering (3) -----
November 15, 1993
90% if compressor operating
80% no compressor operating
4 inch vacuum under ARI 740
List 2 examples of EPA certified testing laboratories.
UL (underwriters laboratories)
ETL (edison testing laboratories)
All equipment must be equipped with ----- fittings that can be -----, or close -----, when hoses are disconnected to minimize the refrigerant loss
low loss
manually closed
Does the EPA require leaks for small appliances be repaired?
No, but leaks should be repaired whenever possible
Before beginning a refrigerant recovery procedure, it is necessary to know...
the type of refrigerant that is in the system
If a reclamation facility receives a tank of mixed refrigerant, they may ----- and -----.
refuse to process the refrigerant

return it at the owner's expense
If a reclamation facility agrees to destroy a tank of mixed refrigerant, usually there will be a -----.
substantial fee.
Do not mix ----- in a recovery tank.
Self-contained (active) recovery equipment has ----- means of removing refrigerant from appliances and is capable of ----- whether or not the compressor is operable
it's own

reaching the required recovery rates
Self Contained recovery equipment stores refrigerant in a -----.
pressurized recovery tank
Before operating a self-contained recovery machine, make sure that the -----, and that the recovery tank does not -----.
tank inlet valve is open

contain excessive non-condensibles (air)
Obtaining accurate ----- of refrigerant inside a recovery cylinders is necessary to detect excessive non-condensibles.
pressure readings
The only way to read refrigerant pressure accurately is at a -----.
stable, known temperature.
Air in a refrigeration system will cause ----- discharge pressures.
Regarding purging of non-condensables, follow -----
the operating instructions supplied by the recovery equipment manufacturer
All refrigerant recovery equipment should be check for (2)----- on a daily basis.
oil level and
refrigerant leaks
A system-dependent (passive) recovery process for small appliances captures refrigerant in a -----.
non-pressurized container.
A non-pressurized container is a container with -----
a special charcoal activated plastic "bag"
System-dependent equipment captures refrigerant with the assistance of (3) ----.
the appliance compressor,
an external heat source, or
a vacuum pump.
A standard vacuum pump can only be used as a recovery device in combination with a -----.
non-pressurized container
With system-dependent recovery equipment, some ----- may be necessary, depending on the ----- of the appliance..
special procedures

When using a system dependent recovery process on an appliance with an operating compressor, run the compressor and recover from -----.
the high side of the system
(operating compressor) Usually one access fitting on the high side will be sufficient to reach the required recovery rate, because -----
the appliance compressor should be capable of pushing the refrigerant to the high side
If the appliance has a non-operating compressor, access to ----- may be necessary
both the high side and the low side
(non-operating compressor) In order to achieve the required recovery efficiency, it will be necessary to ----- to help release trapped refrigerant from the oil.
take measures such as heating and tapping the compressor several times and/or use a vacuum pump
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.
at least one self-contained recovery device available at the shop
The exception to the EPA requiring technicians to have a recovery device to for non-operating compressors is -----
if you are a technician that only works on small appliances.
System dependent devices may only be used on appliances containing ----- of refrigerant or less.
15 pounds
Small appliances are equipped with a straight piece of tubing that can be used to -----.
install a piercing type access fitting
When installing an access fitting onto a sealed system, the fitting should be ----- before proceeding with recovery
leak tested
It is generally recommended that solderless piercing type valves only be uses on ----- or ----- tubing material.

Solderless piercing type valves tend to ----- and should not be left on an appliance as a ----- service fixture.
leak over time

After installing an access fitting, if you find that the system pressure is 0 psig, do not -----
begin the recovery process.
If the appliance is equipped with a defrost heater, such as in a domestic frost-free refrigerator, operating the defrost heater will (2)-----
help to vaporize any trapped liquid refrigerant and will speed up the recovery process.
If a strong odor is detected during the recovery process, a ----- has likely occured.
compressor burn-out
When recovering refrigerant from a system that experienced a compressor burn-out, watch for -----
signs of contamination in the oil.
After recovering refrigerant, if nitrogen is used to flush debris out of the system, the nitrogen may be -----.
legally vented.
Refrigerators built before 1950 may have used (3) ----- as refrigerant and ----- be recovered with current recovery devices.
Methyl formate, Methyl Chloride, or Sulfer Dioxide

should not
When filling a graduated charging cylinder with a regulated refrigerant, the refrigerant vapor that is ----- of the cylinder must be recovered.
vented off the top