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Using a system dependent(passive) recovery process, which condition requires accessing both high and low side of the system for recovery
when the compressor does not run
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when R-500 is recovered from the appliance, where must it be recovered
in it's own recovery tank that is clearly marked to ensure no mixing of the refrigerant occurs
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recovery equipment used during maintenance, service,or repair of small appliances, must be certified by an EPA approved laboratory if manufactured After
November 15, 1993
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when checking for non-condensibles inside a recovery cylinder, why should the technician allow the temp of the cylinder to stabilize to room temp before taking a pressure reading
comparison to a pressure/temp chart are only valid if both the pressure/temp of the refrigerant are stable and known
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a standard vacuum pump designed specifically for evacuation and dehydration can
never be used as a recovery device in combination with a pressurized container
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when is it mandatory for leak repair on small appliances
it is not mandatory to fix a leak on small appliances according to the EPA, but it good practice to do so.
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what should you do to the compressor when recovering refrigerant into a non-pressurized container and the compressor is off
it is necessary to strike the compressor with a rubber mallet and heat it up with a heat gun, to separate the refrigerant trapped in the oil of the compressor
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if using passive or active recovery on a small appliance, sealed system with a non-operating compressor, how much refrigerant does the EPA require the technician to recover
80%
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what should be done to any access fitting before installing it on a sealed system
the fitting should be leak tested before installation, then the system should be pressure tested, then recovery can be performed.
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an MVAC - like system (auto) is not part of type 1 refrigeration
NOTE: because this system has access ports. Type 1 appliances has n o access port and are factory charged with sealed tubes
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What is the definition of a small appliance according to EPA
- 5Lbs or less refrigerant
- charged and hermetically sealed refrigerant lines with no access ports
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Who is responsible for regulations changed or created by the EPA after the technician becomes certified
It is the technicians responsibility to stay current with all new and changing regulations set forth by EPA and local governments
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who is allowed to buy cfc and hcfc refrigerants
only technicians certified in recovery of said refrigerants
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before starting a recovery on a system, what is the first thing you should check
the type of refrigerant to prevent mixing of refrigerants in the recovery tank
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when performing a system dependent (passive) recovery, for small appliances, where should the refrigerant be stored.
in a non-pressurized recovery bottle/container
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it is generally recommended that piercing -type valves be used on which type of the following tubing materials
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if a reclamation center receives mixed refrigerant in a recovery bottle what could they do
- they can fine you
- refuse the bottle and return it to you for a fee
- or destroy ht e refrigerant for a fee
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if a large leak of refrigerant occurs and there is no breathing apparatus available, what should you do
run like a crack head stealing your copper out of your work truck
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when recovering refrigerant from a compressor not running, it is recommended that you use both high and low side because
- to speed up the process
- it may help achieve lower required recovery efficiency
-
refrigerants in large quantities can cause suffocation because
they are heavier than air and displace oxygen
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portable refillable tanks used to ship refrigerant with recovery equiptment, must meet what standards
department of transportation (DOT)
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at high temp(open flame,Glowing metal) R-12 & R-22 can decompose to form what
Phosgene Gas (mustard gas) this will attack the nervous system over time
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each cylinder must have a DOT classification tag indicating it is "2.2 non-flammable gas"
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recovery equipment before November 15 1993
compressor on or off 80%
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a standard vacuum pump can only be used as a recovery device when combine with a non-pressurized container
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system dependent devices may only be used on appliance containing 15 Lbs or less
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recovery equipment after November 15 1993
- compressor on 90%
- compressor off 80%
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when filling a graduated charging cylinder, refrigerant that is vented off the top of the cylinder must be what
must be recovered
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