Row 1
Portable refillable tanks or containers used to ship CFC or HCFC refrigerants obtained with recovery equipment must meet what whose standards?
Department of Transportation
When used, solderless type piercing valves, they should not remain installed on refrigeration systems after completion of repairs for what reason?
they tend to leak over time
If EPA regulations change after a technician becomes certified what happens?
They are responsible to comply with any future changes in the law (no re-certification or re-testing required)
Technicians who pass the small appliance exam are certified to recover refrigerant on packaged terminal air conditioners with how much refrigerant?
5 pounds or less of refrigerant
Before beginning a refrigerant recovery procedure it is ALWAYS necessary to do what?
know the type of refrigerant that is in the system
If a large leak of refrigerant occurs such as from a filled cylinder in an enclosed area, what actions (2) should be taken when no self-contained breathing apparatus is available?
vacate and ventilate the spill area
Is an MVAC-like system a Type I appliance?
No, MVAC is related to transportation (in cars, boats, planes, etc)
A storage cylinder of recovered R-22 at normal room temperature (about 75 degrees F), in absence of non-condensables, will be pressurized to what psig(use chart to find the answer)?
130 psig
Before shipping any used refrigerant in a cylinder it is necessary to do what?
properly complete shipping paperwork
Which of the following refrigerants must be recovered with equipment currently regulated by the equipment certification requirements of the EPA under section 608 (sulfur dioxide, mehtyl choride, methyl formate, or R-12)?
R-12
At high temperatures R-12 and R-22 can decompose to form what gas?
phosgene gas
The sale of CFC and HCFC refrigerants is handled how: (banned, limited to equipment owners, allowed only if there is proof of need, or restricted to technicians who are EPA certified in recovery)?
restricted to technicians who are EPA certified in refrigerant recovery
When using nitrogen in repairing a sealed refrigeration system, the nitrogen tank should always be equipped with what?
a regulator
Refrigerants (i.e. R-12,R-22,R-500, etc) in large quantities can cause suffocation because why?
they are heavier than air and displace oxygen
For which of the following refrigeration systems/appliances would it be permissible to use a passive recovery device for refrigerant recovery (centrifugal air conditioner, recicprocating liquid chiller, single compressor large commercial walk-in freezer, or a domestic refrigerator)?
a domestic refrigerator
Equipment manufactured after November 15, 1993 which is used to recover refrigerant from small appliances for the purpose of disposal must meet what standards (% recovery) when the compressor is operative and when it is inoperative
Operative: recover 90% of the refrigerant
Inoperative: recover80% of the refrigerantTo speed the recovery process and ensure that all refrigerant has been removed from a frost-free refrigerator, you should do what?
turn on the defrost heater to vaporize any trapped liquid
If a reclamation facility receives a tank of mixed refrigerant, what two options do they have?
refuse to process the refrigerant and return it at the owner's expense, or agree to destroy the refrigerant which typically has a substantial fee for the owner
Small appliance recovery equipment manufactured after November 15, 1993 must be certified to be capable of what (% recovery)?
Recovering 90% of the refrigerant when the compressor is operating or achieving a 4 inch vacuum under the conditions of ARI 740
Using the system-dependent (passive) recovery process, which condition requires accessing both the high and low side of the system for refrigerant recovery (when there is a leak in the system, when compressor operates normally, when compressor only runs at half speed, or when compressor does not run)?
when the compressor does not run
All appliances must be equipped with a service aperture or other device which is used when adding or removing refrigerant from the appliance. For small appliances, this service port is typically what kind?
a straight piece of tubing that is entered using a piercing access valve
All recovery devices manufactured before November 15, 1993 for use with small appliances must meet what requirement (% of recovery)?
capable of recovering 80% of the refrigerant whether or not the compressor is operating or achieving a 4 inch vacuum under conditions of ARI 740
It is generally recommended that piercing-type valves be used on which two tubing materials?
copper and aluminum
On a sealed system with an operating compressor that has a completely restricted capillary tube, how many access valves (and which ones) are needed to evacuate the refrigerant?
only one valve, on the high side of the system
What two conditions can cause excessive pressure conditions on the high side of a self-contained (active) recovery device?
when the recovery tank inlet valves has not been opened or when there is excessive air in the recovery tank