A self-contained self-rescue device, SCSR, self-contained self-rescuer, or air pack
Self-contained breathing apparatus
A self-contained breathing apparatus, sometimes referred to as a compressed air breathing apparatus or simply breathing apparatus, is a device worn by rescue workers, firefighters, and others to provide breathable air in an immediately dangerous to life or health atmosphere. When no…
Carbon Monoxide Poisoning
Serious tissue damage caused by carbon monoxide building up in the bloodstream.
What is a self contained self rescue device?
A self-contained self-rescue device, SCSR, self-contained self-rescuer, or air pack is a portable oxygen source for providing breathable air when the surrounding atmosphere lacks oxygen or is contaminated with toxic gases, e.g. carbon monoxide .
What is self contained refrigerant recovery equipment?
Self-contained (active) recovery equipment has it own means of removing refrigerant from appliances and is capable of reaching the required recovery rates, whether or not the appliance’s compressor is operable. Self-contained recovery equipment stores refrigerant in a pressurized recovery tank.
When using a self contained recovery device on a CFC system?
When using a self-contained recovery device on a CFC, HCFC, or HFC system with an operating compressor, technicians must; recover 80% of the nameplate charge. Which condition requires accessing both the high and low side of the system for refrigerant recovery when using the system-dependent (passive) recovery process?
How does a self contained recovery tank work?
Self-contained recovery equipment stores refrigerant in a pressurized recovery tank. Before operating a self-contained recovery machine, make sure that the tank inlet valve is open, and that the recovery tank does not contain excess noncondensables (such as air).
What is a self contained recovery unit?
Self-contained recovery equipment means refrigerant recovery or recycling equipment that is capable of removing the refrigerant from an appliance without the assistance of components contained in the appliance.
What differentiates system-dependent and self contained recovery devices in refrigeration systems?
Self-contained recovery equipment stores refrigerant in a pressurized recovery tank. A system-dependent (passive) recovery process for small appliances captures refrigerant into a non-pressurized container refrigerant with the assistance of the appliance compressor, an external heat source, or a vacuum pump.
What are two types of recovery equipment?
What are two types of recovery equipment? System-dependent and self contained.
When using a self contained recovery device on a CFC HCFC or HFC system with an operating compressor technicians must?
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.
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.
What is system-dependent recovery system?
System-dependent (passive) recovery is the recovery of refrigerant from a system employing the refrigeration system's internal pressure and/or compressor to aid the recovery process. System-dependent equipment cannot be used with appliances containing more than 15 pounds of refrigerant.
What are the three types of recovery machines that are being used today?
Some systems have a purge option.HVAC tools.Refrigerant Recovery Machines.coolant recovery machines.
How do Recovery machines work?
How a Recovery Machine Works. When a recovery machine is hooked up to the manifold or Schraeder valves on the air conditioning system, it creates a vacuum and sucks all the Freon out of the vehicle, cleanses it through a filter and stores it in a storage tank.
What are the 3 refrigerant recovery methods?
The three different recovery methods are: vapor recovery; the push-pull method; and the liquid recovery method. In the vapor recovery method, the refrigerant is removed from the HVAC system in a vapor state.
When can you use a passive recovery device?
Passive recovery is limited to appliances with 15 lbs or less of refrigerant. This includes small appliances with 5lbs or less of refrigerant, like household refrigerators. These are appliances which we cover in Type I.
What type of certification is required for persons recovering CFCs?
Technicians must pass an EPA-approved test to earn Section 608 technician certification.
What gases can CFC and HCFC refrigerants?
Answer: Hydrochloric and hydrofluoric acids At high temperatures, CFCs and HCFCs decompose to:Hydrochloric acids and.Hydrofluoric acids.
What is a self-rescue device?
A self-contained self-rescue device, SCSR, self-contained self-rescuer, or air pack is a portable oxygen source for providing breathable air when the surrounding atmosphere lacks oxygen or is contaminated with toxic gases, e.g. carbon monoxide . Self-rescuers are intended for use in environments such as coal mines where there is a risk ...
Where are self rescuers used?
Self-rescuers are intended for use in environments such as coal mines where there is a risk of fire or explosion, and in a location where no external rescue may be available for some time – the wearer must make their own way to safety , or to some pre-equipped underground refuge.
What is a SCSR?
Oxygen sources. A SCSR is usually a closed-circuit breathing apparatus with a chemical oxygen generator or a compressed oxygen cylinder and a carbon dioxide absorber. SCSRs are most commonly used in some coal mines, are intended for one person, and usually supply at least one hour of oxygen.
Why do respirators need to be sealed?
For storage, the respirator must be kept sealed within its case to avoid the catalyst activating and becoming consumed. The catalyst reaction is exothermic and so the respirator and its gas gets hot in use. The case is metal, to conduct some of this heat away.
What are the two forms of rescuers?
There are two forms of rescuer: respirators and oxygen sources.
How long does a respirator last?
Once in use, the respirator has a working life of around two hours. They are used by holding a mouthpiece in the mouth, with the weight of the respirator taken by a headband. A nose clip keeps the nose shut and all breathing, in and out, must be through the mouth and the respirator.
What is the function of a respirator?
A respirator's function is to protect against carbon monoxide, as the most likely dangerous gas after a mining fire or explosion. The respirator does this by oxidising the toxic monoxide to safe carbon dioxide.
What to know before operating a self contained recovery machine?
Before operating a self-contained recovery machine, make sure that the tank inlet valve is open, and that the recovery tank does not contain excess noncondensables (such as air). Follow the operating instruction supplied by the recovery equipment manufacturer regarding purging of noncondensables.
What is system dependent recovery?
System-dependent (passive) recovery is the recovery of refrigerant from a system employing the refrigeration system’s internal pressure and/or compressor to aid the recovery process. System-dependent equipment cannot be used with appliances containing more than 15 pounds of refrigerant.
What is passive recovery?
In all passive recovery, the refrigerant must be recovered in a nonpressurized container. Whether or not the compressor is operative, gently striking the compressor with a wood or rubber mallet during recovery will agitate and release the refrigerant dissolved in the compressor’s crankcase oil.
How to remove refrigerant from a system?
Removal of refrigerant from a system can be accomplished by one of two basic methods: passive or active. To comply with government regulations and best serve customer needs, time must be taken to evaluate the system and determine which method to employ. Questions to be considered by the technician:
Why is it important to remove liquid from a charging cylinder?
To ensure that the proper blend composition is charged into the system, it is important that liquid only be removed from the charging cylinder. Some cylinders supplied by manufacturers have dip tubes, which allow liquid refrigerant to be removed from the cylinder when it is in the upright position.
Can R-410A be charged with liquid?
Even though R-410A has very small fractionation potential, it cannot be ignored completely when charging. To avoid fractionation, charging of an air conditioning system incorporating R-410A should be done with “liquid” to maintain optimum system performance.
Is R-407C the same as R-410A?
The same methods used for charging R-410A systems hold true for R-407 C systems, even though R-407C systems have more fractionation potential. Since R-407C system pressures and temperatures are somewhat similar to an R-22 system, the same manifold gauge set and charging cylinder types can be used.
How to recover refrigerant from small appliances?
Methods to recover refrigerant from small appliances with inoperative compressors using a system-dependent or "passive" recovery device ( e.g., heat and sharply strike the compressor, use a vacuum pump with non-pressurized recovery container)
What is the ODP of CFC-11?
The ODP is the ratio of the impact on ozone of a chemical compared to the impact of a similar mass of CFC-11. Thus, the ODP of CFC-11 is defined to be 1.0.
How long after vacuum to check for liquid refrigerant?
Need to wait a few minutes after reaching required recovery vacuum to see if system pressure rises (indicating that there is still liquid refrigerant in the system or in the oil)
How much refrigerant can be recovered with an inoperative compressor?
recover 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with an operative compressor.
How much refrigerant can I recover from a 740?
Recovering 90% of the refrigerant when the compressor is operating or acheiving a 4 inch vacuum under the conditions of AHRI 740.
Who is restricted to refrigerant recovery?
restricted to technicians who are EPA certified in refrigerant recovery.
Can hydrocarbons be retrofitted?
hydrocarbons are not approved for retrofit applications.
Why do you need to connect a recovery device to an appliance?
Connect the recovery device to an appliance and which are manually closed (or which close automatically) when they are disconnected to prevent loss of refrigeration.
What is a closed recovery tank?
A closed recovery tank inlet, excessive air or other non-condensables in the recovery tank.
How much refrigerant is recovered in an appliance?
Recover %80 of the refrigerant in an appliance if the appliances compressor is functional, recover %90 of the refrigerant in an appliance if the appliances compressor is operational.
When is 90% of refrigerant recovered?
Recovering 90% of the refrigerant when the compressor is operational or achieving a 4inch vacuum under the conditions of ARI740-1993.
Who is restricted to refrigerant recovery?
Restricted to technicians who are EPA certified in refrigerant recovery.
Can a syringe be used as a recovery device?
It can never be used as a recovery device in combination with a pressurized container.
Who is restricted to refrigerant recovery?
Restricted to technicians who are EPA certified in refrigerant recovery.
Can recovery begin after opening piercing access valve?
After installing and opening a piercing access valve, the recovery procedure cannot begin if the system is at what pressure?
Can a recovery device be used in combination with a pressurized container?
Never be used as a recovery device in combination With a pressurized container.
