Table of Contents
- 1 Which refrigerant is very high pressure and generally does not need to be recovered?
- 2 What are self-contained recovery devices?
- 3 Which condition requires access both the high and low side of the system for refrigerant recovery when using the system dependent passive recovery process?
- 4 Why can a very large refrigerant leak cause suffocation?
- 5 Which of the following is required when attaching a gauge set to check system pressures?
- 6 How is the pressure of a refrigerant cylinder containing saturated refrigerant determined?
Which refrigerant is very high pressure and generally does not need to be recovered?
The sale of CFC, HCFC, HFC, and HFO refrigerants to service or install refrigeration and air-conditioning equipment is restricted to technicians who are EPA certified in refrigerant recovery. MVAC-like systems do not meet the criteria for Type I appliance certification no matter the type or quantity of refrigerant.
What are self-contained recovery devices?
Self-contained (active) recovery equipment has its own means of removing refrigerant from appliances and is capable of reaching the required recovery rates whether or not the appliance compressor is operable. Self-contained recovery equipment stores refrigerant in a pressurized recovery tank.
When do you use a self-contained recovery device on a CFC?
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? Refrigerants cannot be mixed.
Which of the following recovery equipment maintenance practice should be performed on regular basis?
According to the EPA, which recovery equipment maintenance practice(s) should be performed on a regular basis? Check recovery device for refrigerant leaks.
Which condition requires access both the high and low side of the system for refrigerant recovery when using the system dependent passive recovery process?
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.
Why can a very large refrigerant leak cause suffocation?
In large quantities, refrigerants can cause suffocation because they are heavier than air and displace oxygen.
What is the approximate pressure of a storage cylinder of recovered?
The storage cylinder of recovered R-410A is mixture of difluoromethane and pentafluoroethane which is used as a refrigerant in air conditioning application. The refrigeration sector has low temperatures for installation. The pressure of cylinder at 80 F will be 173 psig.
What does CFC 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.
Which of the following is required when attaching a gauge set to check system pressures?
Which of the following is required when attaching a gauge set to check system pressures? Have manual or self-sealing valves on the ends of the gauge set hoses to minimize any release of refrigerant.
How is the pressure of a refrigerant cylinder containing saturated refrigerant determined?
The pressure of a refrigerant cylinder containing saturated refrigerant: Is determined entirely by the temperature of the refrigerant. The pressure of a saturated refrigerant can accurately be predicted: By comparing its temperature to the corresponding pressure on a pressure-temperature chart.
How do refrigerants cause suffocation?
A very large leak can cause suffocation because refrigerants are heavier than air and displace oxygen. This cuts off oxygen supply at ground level and causes suffocation.