Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
24 Cards in this Set
- Front
- Back
|
What are the Required Levels of Evacuation @ 29.921".
For HCFC-22 systems with less than 200 lbs.of charge that are manufactured prior to November 15 1993? A. 0" Hg Vacuum B. 4" Hg Vacuum C. 10" Hg Vacuum D. 15" Hg Vacuum |
A. 0" Hg Vacuum
|
|
|
What are the Required Levels of Evacuation @ 29.921".
For HCFC-22 systems with less than 200 lbs.of charge that are manufactured after November 15 1993? A. 10" Hg Vacuum B. 4" Hg Vacuum C. 0" Hg Vacuum D. 25mm Hg Vacuum |
C. 0" Hg Vacuum
|
|
|
What are the Required Levels of Evacuation @ 29.921".
For HCFC-22 systems with more than 200 lbs.of charge that are manufactured prior to November 15 1993? A. 15" Hg Vacuum B. 4" Hg Vacuum C. 0" Hg Vacuum D. 25" Hg Vacuum |
B. 4" Hg Vacuum
|
|
|
What are the Required Levels of Evacuation @ 29.921". For
other High Pressure systems with less than 200 lbs.of charge ( R12, R500, R502, R114 )that are manufactured prior to November 15 1993? A. 0" Hg Vacuum B. 4" Hg Vacuum C. 10" Hg Vacuum D. 15" Hg Vacuum |
B. 4" Hg Vacuum
|
|
|
What are the Required Levels of Evacuation @ 29.921".
For HCFC-22 systems with more than 200 lbs.of charge that are manufactured after November 15 1993? A. 10" Hg Vacuum B. 4" Hg Vacuum C. 0" Hg Vacuum D. 25mm Hg Vacuum |
A. 10" Hg Vacuum
|
|
|
What are the Required Levels of Evacuation @ 29.921".
For other High Pressure systems with less than 200 lbs.of charge ( R12, R500, R502, R114 ) that are manufactured after November 15 1993? A. 0" Hg Vacuum B. 4" Hg Vacuum C. 10" Hg Vacuum D. 15" Hg Vacuum |
C. 10" Hg Vacuum
|
|
|
What are the Required Levels of Evacuation @ 29.921". For other High Pressure systems with more than 200 lbs.of charge ( R12, R500, R502, R114 ) that are manufactured prior to November 15 1993?
A. 15" Hg Vacuum B. 4" Hg Vacuum C. 0" Hg Vacuum D. 25" Hg Vacuum |
B. 4" Hg Vacuum
|
|
|
What are the Required Levels of Evacuation @ 29.921". For other High Pressure systems with more than 200 lbs.of charge ( R12, R500, R502, R114 ) that are manufactured after November 15 1993?
A. 0" Hg Vacuum B. 4" Hg Vacuum C. 10" Hg Vacuum D. 15" Hg Vacuum |
D. 15" Hg Vacuum
|
|
|
What are the Required Levels of Evacuation @ 29.921". For all other High pressure systems ( R13, & R503 ) that are manufactured prior to November 15 1993?
A. 10" Hg Vacuum B. 4" Hg Vacuum C. 0" Hg Vacuum D. 25mm Hg Vacuum |
C. 0" Hg Vacuum
|
|
|
What are the Required Levels of Evacuation @ 29.921". For all other High pressure systems ( R13, & R503 ) that are manufactured after November 15 1993?
A. 15" Hg Vacuum B. 4" Hg Vacuum C. 0" Hg Vacuum D. 25" Hg Vacuum |
C. 0" Hg Vacuum
|
|
|
What are the Required Levels of Evacuation @ 29.921". For all low pressure systems ( R13 & R503 ) that are manufactured prior to November 15 1993?
A. 15" Hg Vacuum B. 4" Hg Vacuum C. 0" Hg Vacuum D. 25" Hg Vacuum |
D. 25" Hg Vacuum
|
|
|
What are the Required Levels of Evacuation @ 29.921". For all low pressure systems ( R13 & R503 ) that are manufactured after November 15 1993?
A. 10" Hg Vacuum B. 4" Hg Vacuum C. 0" Hg Vacuum D. 25mm Hg Vacuum |
D. 25mm Hg Vacuum
( 29" Hg Vacuum ) |
|
|
What are CFC refrigerants?
|
(1) Man made Chlorofluorocarbon chemicals.
(2) CFCs are made by sudstituting the halogens Fluorine, Chlorine and/or Bromine atoms for Hydrogen atoms in hydrcarbons and are thus called halocarbons. They include CFC 11,12,13,113,114,115,500 & 502 Used for thermal properties as well as for propellants and solvents. |
|
|
What are HCFC refrigerants?
|
(1) Hydrochlorofluorocarbons (HCFCs)
(2) HCFCs are enabling the phaseout of CFCs. They are energy-efficient, low-in-toxicity, cost effective and can be used safely. HCFCs are up to 98% less ozone depleting and have 80% shorter atmospheric lifetimes, than the corresponding CFCs they replaced. |
|
|
Persons servicing the pressure side of air conditioning or refrigeration systems or who purchase refrigerants must be certified under what Section of the Clean Air Act?
|
Section 608 of the Clean Air Act.
|
|
|
Describe the Four types of CFC Certifications:
|
Type I > For servicing small appliances.
Type II > For servicing or disposing of high or very high pressure appliances. Type III > For servicing or disposing of low pressure appliances. Universal > For servicing all types of equipment. |
|
|
What is a Azeotrope?
|
True Azeotropes are produced by combining two different refrigerants in such a way that they form an entirely new compound which has pressure-temperature characteristics uniquely different from either of their component parts. They are, therefore, unable to be separated by distillation. If vapor is released from a container, via a leak, while at saturation, (both liquid and vapor present) the remaining refrigerant will retain its original composition. In other words, the components leak in amounts equal to their percentage of concentration.
|
|
|
What is Fractionation?
|
(1) The seperation of component parts of a near-azeotrope or refrigerant blend.
Because each component of a blend boils at a slightly different temperature, blends may fractionate. |
|
|
What is a Ternary Blend?
|
A mixture of three similar refrigerants which has a temperature range over which it will boil at any given pressure.
|
|
|
What is Temperature Glide?
|
The temperature range over which a ternary blend will boil at any given pressure.
|
|
|
In the refrigeration business the term small appliance refers to?
|
A factory charged and hermetically sealed self-contained unit with a refrigerant charge of 5 lbs or less such as: domestic refrigerators, water coolers, wndow air conditioners, etc.
|
|
|
Describe the three "Rs"
Recover - Recycle - Reclaim: |
To Recover > is to remove refrigerant and store it in a DOT approved (4BA or 4BW) container.
To Recycle > is to reuse recovered refrigerant after oil removal and passing it through filters. To Reclaim > is to re-process refrigerant to it's original (virgin) standard of purity and verify by laboratory analysis that it complies with the standard set fourth in ARI 700. |
|
|
What is the Montreal Protocol and when was it established?
|
The Montreal Protocol on Substances That Deplete the Ozone Layer is an international treaty designed to protect the ozone layer by phasing out the production of a number of substances believed to be responsible for ozone depletion. The treaty was opened for signature on September 16, 1987 and entered into force on January 1, 1989.
|
|
|
What is a Near-Azeotrope?
|
Near-Azeotropes or blends. Two or more refrigerants mixed together that will have a small range of boiling and/or condensing points for each system pressure. Small fractionation and temperature glides will occur but are often negligible.
|
