Admin Table of Contents
- 1 When can appliances containing refrigerants to be recovered to atmospheric pressure?
- 2 When should an appliance not be evacuated?
- 3 When using recovery and recycling equipment technicians must evacuate an appliance containing 10 lbs of R 500 to the following level before disposing of the appliance?
- 4 Why should a system be evacuated?
- 5 What are low-pressure appliances?
- 6 What type of refrigerant is used in very high-pressure appliances?
When can appliances containing refrigerants to be recovered to atmospheric pressure?
TYPE II
| 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. |
When should refrigerant be removed?
EPA regulations require that all Commercial and Industrial Process Refrigeration containing more than 50 lbs. of refrigerant MUST be repaired when the annual leak rate exceeds 35%.
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”.
Which refrigerant is a CFC and has been used with low pressure appliances?
epa 3
| Question | Answer |
|---|---|
| The maximum pressure that should be applied to a low pressure chiller when leak checking with controlled nitrogen is: | 10 psig |
| Type III certification as classified by EPA is for: | Low pressure appliances |
| Which refrigerant is a CFC and has been used with low pressure appliances? | R-11 |
When using recovery and recycling equipment technicians must evacuate an appliance containing 10 lbs of R 500 to the following level before disposing of the appliance?
When using recovery and recycling equipment manufactured BEFORE November 15, 1993, technicians must evacuate an appliance containing 10 pounds of CFC-500 to the following level before disposing of the appliance: 4 inches of Hg vacuum.
Which of the following refrigerants would be used in a low-pressure appliance?
Low-pressure appliance means an appliance that uses a refrigerant with a liquid phase saturation pressure below 45 psia at 104 °F. Examples include but are not limited to appliances using R-11, R-123, R-113, and R-245fa.
Why should a system be evacuated?
Evacuating a refrigeration system serves two primary objectives. It removes non-condensable material (air) and dehydrates (removes water vapor). When you evacuate a system you are actually dropping the pressure sufficiently to allow water to “boil” at room temperature.
When should an appliance be evacuated all the way to the prescribed level?
15 psig. When should an appliance NOT be evacuated all the way to the prescribed level? When performing a major repair followed by a minor repair. When the repair is followed by an evacuation of the appliance to the environment.
What are low-pressure appliances?
Which refrigerant contains a CFC?
Common CFC refrigerants are R-11, R-12, R-13, R-113, R-114, and R-115. A blend that contains a CFC and any other product is still considered a CFC refrigerant. HCFC Refrigerant: HCFC refers to the chemical composition of the refrigerant.
What type of refrigerant is used in very high-pressure appliances?
High-pressure appliance means an appliance that uses a refrigerant with a liquid phase saturation pressure between 170 psia and 355 psia at 104 °F. Examples include but are not limited to appliances using R-22, R-407A, R-407C, R-410A, and R-502.
When using recovery and recycling technicians must evacuate low pressure appliances to the following level before disposing of the appliance?
should be evacuated to at least 0 psig before it is opened (if high- or very high-pressure appliance) or be pressurized to 0 psig before opening if it is a low-pressure appliance.