What characteristics of CFC and HCFC make them more likely to reach the stratosphere?
What characteristics of CFCs make them more likely than most other chlorine compounds to reach the stratosphere? CFCs neither dissolve in water nor break down into compounds that dissolve in water, so they do not rain out of the atmosphere.
Which of the following is an approved drop in service replacement for R-22?
As a matter of fact, there are many different alternatives to R-22 that don’t deplete the ozone layer, including: R-134a, R-507, R-404A, R-407c and R-410A. R-410A is the best alternative option for air conditioning applications, while the best alternative for refrigeration applications are R-404A and R-507.
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 is a deep vacuum usually measured in?
microns
When would a reciprocating compressor be damaged if energized?
TYPE II
| Question | Answer |
|---|---|
| 24. When could a reciprocating compressor be damaged if energized, | A. When the discharge service valve is closed. |
| 25. It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method, However, | D. requires a pressure regulator |
What level of vacuum should be pulled when evacuating a vapor compression system?
A… is often used to prevent refrigerant from migrating to the oil during periods of low ambient temperature. When evacuating a vapor compression system, the vacuum pump should be capable of pulling… of vacuum. 500 microns (29.90” hg.)
What state is the refrigerant in when it enters the compressor?
saturated vapor
How do evaporators work?
The evaporator works the opposite of the condenser, here refrigerant liquid is converted to gas, absorbing heat from the air in the compartment. The evaporator removes heat from the area that is to be cooled. The desired temperature of cooling of the area will determine if refrigeration or air conditioning is desired.
Is it worth replacing evaporator coil?
Often replacing the AC is much more cost-effective for several reasons. Replacing only one coil can cause significant issues with your AC. Just replacing the evaporator coil can make it an incompatible match with the condenser coil.
How do you clean an evaporator coil without removing it?
How to clean A/C evaporator coils using mild detergents and water
- Mix warm water and a simple detergent in a spray bottle, hand sprayer or garden sprayer.
- Apply the water and detergent solution to the evaporator coils.
- Give the solution a few seconds to a few minutes to soak in and loosen debris.