Before shipping any used refrigerant cylinders,
check that the cylinder meets DOT standards, complete the shipping paperwork including the number of cylinders of each refrigerant
, and properly label the cylinder with the type and amount of refrigerant. Cylinders should be transported in an upright position.
What must be done before shipping any used refrigerant in a cylinder quizlet?
Before shipping any used refrigerant cylinders,
check that the cylinder meets what standards: Department of transportation
.
What is the service procedure if the refrigerant in a recovery cylinder is suspected to be contaminated?
If the refrigerant in a recovery cylinder is suspected to be contaminated,
a pressure reading of the cylinder should be taken and compared to a pressure
/temperature chart. Recovery cylinders are specifically designed to be refilled. Recovery cylinders have 2 ports, one liquid and one vapor.
How should disposable cylinders of CFCs HCFCs and HFCs be discharged?
How should disposable cylinders of CFCs, HCFCs, and HFCs be discarded?
Bleed any remaining refrigerant to ambient air and put the cylinders into a trash dumpster
. Recover all remaining refrigerant, render the cylinders useless and recycle the metal. Refill the cylinders at an approved facility and reuse.
Which of the following does not meet the criteria for type one appliance certification?
An MVAC-like system that holds three pounds of R-12
does not meet the criteria for type 1 appliance certification.
Which refrigerants is very high pressure and generally does not need to be recovered?
Co2 refrigerant R-744 (Carbon dioxide)
is a very high-pressure refrigerant and generally does not need to be recovered.
What may be done to speed the recovery process?
What may be done to speed the recovery process and ensure that all CFC, HCFC, or HFC refrigerant has been removed from a frost-free refrigerator?
Turn on the defrost heater to increase the refrigerant’s temperature and vaporize any liquid
.
What steps should be taken before using a recovery unit to remove a charge?
Question #8: What steps should be taken before using a recovery unit to remove a charge?
Acid testing the refrigerant
. Purging the recovery unit with nitrogen. Changing the oil in the recovery unit.
When recovering refrigerant into a non-pressurized container from a refrigerator?
Which of the following refrigerants is most commonly used as a replacement for R-12 in new household refrigerators? When recovering refrigerant into a non-pressurized container from a refrigerator with an inoperative compressor:
it is necessary to heat and strike the compressor with a rubber mallet
.
Which condition requires accessing both the high and low side of the system for refrigerant recovery?
using the system dependent (passive) recovery process, which condition requires accessing both the high and low side of the system for refrigerant recovery?
it is necessary to heat the compressor and strike it with a rubber mallet.
Which refrigerants must be recovered before opening?
Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs)
have which of the following in common? They must be recovered before opening or disposing of appliances. After 1995, supplies of CFC refrigerant for equipment servicing will come from; recovery and recycling.
Does R22 contain chlorine?
Freon (R22) Refrigerant and its Replacement
Freon is DuPont’s commercial name for R22, a member of the chlorofluorocarbon (CFC) organic compounds that contains
carbon, chlorine
, hydrogen and fluorine.
Is refrigerant gas or liquid?
A refrigerant is
a working fluid
used in the refrigeration cycle of air conditioning systems and heat pumps where in most cases they undergo a repeated phase transition from a liquid to a gas and back again.
Why are service apertures required on systems?
When servicing a small appliance found to be leaking it is; not mandatory to repair the leak but it is recommended to do so whenever possible. All appliances must be equipped with a service aperture or process stub which is
used when adding or removing refrigerant from the appliance
.
Why should low and high side access?
When recovering refrigerant from a household refrigerator who’s compressor does not run, it is recommended that low and high side access valves be installed, why? Both A and B. It
can enhance the speed of recovery
, it may be necessary to achieve required recovery efficiency.
Which of the following best describes low loss fittings?
Which of the following best describes low loss fittings on refrigerant recovery devices used to recover CFCs, HCFCs, and HFCs? They can be either manually closed or automatically closed when disconnected to prevent loss of refrigerant from hoses. …
the fitting should be leak tested before proceeding with recovery
.
