Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
CFC Type 3
EPA 608 Type 3 Flash Cards
| Question | Answer |
|---|---|
| What type of appliances are covered under EPA Type III certification? | Low-pressure appliances such as chillers that use refrigerants like R-11, R-123, or R-113. |
| Why must low-pressure appliances be leak-tested at atmospheric pressure instead of a vacuum? | Because air and moisture can be drawn into the system under a vacuum, making leak detection inaccurate. |
| What is the required recovery level if the recovery machine was manufactured before November 15, 1993? | 25 mm Hg absolute. |
| What is the required recovery level for low-pressure appliances when using a recovery machine manufactured after November 15, 1993? | 25 mm Hg absolute. |
| Why is water a major concern in low-pressure refrigeration systems? | Water can freeze in the evaporator and cause corrosion and reduced system efficiency. |
| What refrigerant property allows low-pressure systems to operate efficiently at low temperatures? | Low boiling point under low pressure |
| Where is the purge unit typically located on a low-pressure chiller? | At the highest point of the system where non-condensables collect. |
| What should be done with refrigerant removed from a purge unit? | It must be recovered and not vented to the atmosphere. |
| Why should a pressure relief device on a low-pressure appliance never be capped or plugged? | Because it could cause excessive pressure buildup and lead to equipment damage or explosion. |
| What is the primary source of non-condensables in low-pressure refrigeration systems? | Air leaks and improper evacuation procedures. |
| Do low-pressure chillers operate above or below atmospheric pressure? | Below |
| What does a purge unit do? | Remove non-condensables from low-pressure chillers |
| What does a hydrostatic tube test kit do? | Determine if a tube is leaking |
| At what pressure should a low-pressure refrigeration system be checked for leaks? | When the system rises from 1 mm Hg. to a level above 2.5 mm Hg. |
| As of January 1, 2019, what is the maximum leak rate for comfort colling systems | 10% of the charge per year |
| What can happen when using an oversized vacuum pump? | Trapped water in the system can freeze |
| Recovery and recycling equipment must meet what organizations requirements? | EPA |
| How deep of a vacuum should a low-pressure appliance be pulled to? | 25 mm Hg. absolute |
| How is pressure per square inch absolute (psia) converted to pressure per square inch gauge (psig)? | Subtract 14.7 from psia. 14.7 psia=0 psig |
| What standard requires room sensors and alarms to detect refrigerant leaks? | ASHRAE Standard 15-2013 |
| What must be worn when working with liquid refrigerant for low pressure systems | Gloves and safety goggles |
| What should be used to remove ice from a sight glass | Isopropyl alcohol |
| All pressure relief valves should be piped or installed in | Parallel |
| When removing refrigerant oil it should be heated how many degrees | 130 degrees |
| Nitrogen tanks are under what pressure to require safe levels | High pressure |
| Moisture most frequently enters the refrigeration system in low pressure chillers through leaks in what areas | Gaskets or fittings |
| To reduce refrigerant loss from purging a unit on a R-123 chiller you should always do what | Leak test and repair the chiller |
| How many microns should be achieved to remove moisture from the system | 500 |
| On a refrigeration system never install what in series | Multiple pressure relief valves |
| To prevent air accumulation into an idled low pressure refrigeration system you should maintain at what pressure | Atmospheric pressure |
| What is the industry standard airflow for a systems evaporator? | 400 cubic feet per minute |
| What are the most common oils for a compressor? | Mineral oil, Polyol Ester oil (POE), Alkylbenzene oil (AB), Polyalkylene Glycol oil (PAG), and Polyvinyl Ether oil (PVE) |
| What does the condensing unit in a split system contain? | Condenser, compressor, condenser fan, and the associated electrical components/controls |
| What are the most common compressors? | Reciprocating, rotary, screw scroll, and centrifugal. |
| What should you do before using chemicals to clean the coils? | Verify if the chemical is compatible with the coil design. |
| What are the most common patterns in an evaporator coil? | Upflow, downflow, and horizontal. |
| Is the lower connection in the evaporator a primary or secondary drain? | It is the primary drain. |
| Are most, if not all, evaporators that are used with a comfort cooling system multi-circuit evaporators? | True |
| After the refrigerant in the condenser is desuperheated, what is the refrigerant turned into? | Liquid |
| What happens when oil is trapped outside of the system? | The compressor will start to have a system failure. |
Created by:
AHR-160