When using a self-contained recovery device on a CFC, HCFC, or HFC system with an operating compressor, technicians must:
either recover the refrigerant to 4 inches of mercury vacuum or 90% of the nameplate charge
. Which refrigerant can be mixed in an appliance?
When recovering CFC HCFC or HFC refrigerant into a non pressurized container from a household refrigerator with an inoperative compressor it is?
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
.
What acids can CFC and HCFC refrigerants decompose into at high temperatures eg open flames glowing metal surfaces etc?
At high temperatures, CFC and HCFC refrigerants decompose to
hydrochloric acids and hydrofluoric acids
.
Does HFC refrigerant need to be recovered?
All types of refrigerant
should be recovered either when opening a unit to work on it or during the disposal of a unit
. … HFC refrigerants were the replacement for the old Chlorine containing refrigerants but it was found out that HFCs have a large Global Warming Potential, or GWP.
When using a passive system dependent recovery method on an appliance with an operating compressor you should run that appliances compressor?
When using a passive system-dependent recovery method on an appliance with an operating compressor, you should run that appliances
compressor
.
on 240 volts while recovering the refrigerant from the capillary tube
. on 240 volts while recovering the refrigerant from the capillary tube.
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.
What refrigerant is very high pressure and 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 assets can CFC and HCFC refrigerants decompose into at high temperatures?
What acids can CFC and HCFC refrigerants decompose into at high temperatures (e.g.
open flames, glowing metal surfaces
, etc.)? hydrochloric and hydrofluric acids.
Where must you connect a hose in order to recover liquid refrigerant?
You need to connect a hose from
the low side of the manifold to the high side of the recovery unit
. 3. The low-loss hose should be connected to the low-side service port from the discharge side of the recovery unit.
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.
Which is better 407C or 410A?
FreonTM 407C exhibits similar performance to HCFC-22, while
FreonTM 410A
gives significantly higher pressure and refrigeration capacity. General physical properties for FreonTM 407C and FreonTM 410A are shown in Table 3.
What is the difference between HCFC and HFC?
HCFC refers to hydrochlorofluorocarbon, while HFC refers to hydrofluorocarbon. The key difference between HCFC and HFC is that
HCFC contains chlorine and can cause harm to the ozone layer
, whereas HFC is free of chlorine and does not harm the ozone layer.
Which refrigerant is being phased out by 2030?
R-123
will be phased out for new HVAC equipment on Jan. 1, 2020; it will continue to be produced for servicing equipment until 2030. R-22 cannot currently be produced for use in new equipment; all production and import of new R-22 will end in 2020.
What is recovery requirements for maximum of refrigerant for a system dependent recovery?
On a system with an operating compressor, recovery equipment must be capable of recovering;
90% refrigerant or achieving 4 inches of vacuum
.
Which of the following is an approved drop in service replacement for r22?
As a matter of fact, there are many different alternatives to R-22 that don’t deplete the ozone layer, including:
R-134a, R-507, R-404A, R-407c and R-410A
. R-410A is the best alternative option for air conditioning applications, while the best alternative for refrigeration applications are R-404A and R-507.
Which of the following best describes low loss fittings on refrigerant recovery devices?
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
.
