Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs
Do all refrigerants need to be recovered?
Refrigerants should only be reclaimed if the ownership has changed
. All manufacturers and importers of refrigerant recovery equipment are required to have their equipment tested by an EPA-approved organization to lessen the involved hazards.
What type of refrigerant 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.
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 can appliances containing refrigerants be recovered?
| Question Answer | 17. When can appliances containing refrigerants be recovered to atmospheric pressure, C. Leaks in the appliance make recovery to the prescribed level unattainable . | 18. Which of the following repairs would always be consider”major” under EPA regulations, A. Replacement of an evaporator coil. |
|---|
Why refrigerants are required?
The
refrigerant must be chemically stable at the temperatures and pressures
typically expected to be encountered in a refrigeration plant. The refrigerant must not be corrosive or attack normal design materials. The refrigerant must not break down lubricating oil. The refrigerant must be easy to obtain and handle.
Why should some refrigerants not be recovered?
In recent years, the Environmental Protection Agency (EPA) has been phasing out these refrigerants
because they contribute to ozone layer depletion and increase the potential of global warming
. … Section 608 mandates that technicians recover refrigerants containing CFCs, HCFCs, and HFCs instead of venting them.
What is the best method to determine a chillers normal charge?
What is the best method to determine a chiller’s normal charge for leak rate calculations?
Use the charge stated on the equipment nameplate
. Approximately how much refrigerant vapor is left in an average 350-ton R-123 chiller at 0 psig once all the R-123 liquid has been removed?
Which condition requires accessing both the high and low side of the system?
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 can be mixed?
The most commonly mixed refrigerants in the field are the replacements for
R-22 — R-427A, R-438A, R-422D, and R-407C
— which are often combined with the remaining R-22 in the system, said Maiorana.
What will replace HFC’s?
In chillers,
hydrocarbons and ammonia
are safe and energy-efficient alternatives to HFCs, both under moderate and high ambient temperature conditions. Heat pumps are also used with hydrocarbons, additionally CO
2
is available on the market.
Can you recover Freon and reuse it?
Keep in mind that recovered refrigerant cannot be sold to a new owner for use as a refrigerant unless it
has been reclaimed by an EPA-certified reclaimer EPA certified refrigerant reclaimer prior to sale
.
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.
When servicing a small appliance for leak repair it is mandatory?
| EPA regulations include which of the following in the definition of small appliances Both A and B | When servicing a small appliance for leak repair It is not mandatory to repair the leak but do so whenever possible |
|---|
When should an appliance not be evacuated?
The reference manual states “Appliances do not need to be evacuated all the way to the
prescribed level if the appliance is being disposed of
”.
What must be checked before starting a recovery process?
Before beginning recovery, check
the positions of all service valves and the oil level of the recovery unit
. Recover the refrigerant into the system’s own receiver or storage tank if it has one. It is most efficient to recover liquid first (from the system’s liquid line), then vapor.
