Ask A Question
HVAC Questions? Ask an HVAC Expert for Answers ASAP
What is an evaporator?
In domestic HVAC use an evaporator is a set of coiled tubes with fins around it to channel air flow. When the cooling cycle is on, compressed gas enters the evaporator where it expands and becomes cold resulting in the tubes also becoming cold. The air blowing through the fins is chilled and creates the cooling effect. An evaporator is also known as a
. Evaporator problem can affect the functioning of an HVAC system. Experts on JustAnswer have answered a wide variety of questions on evaporator problems.
How do I clean the evaporator on my Rheem model RCBA-3765GG17 air conditioner? I have removed the cover but the A coil only partially slides out
What you are referring to is the RCBA multiplex coil with 3 rows of short A coils. In many cases, these are not easy to clean. If there is not too much dirt, turn off the unit and allow the coils to get completely dry. Using a soft / medium hard brush, gently brush the dirt off. Be careful not to bend the delicate fins. If there is excessive or coagulated dirt, you can use a spray on cleaner that should be available from HVAC supply or hardware stores. Spray the cleaner into the evaporator. Some cleaners can be left on the coils and the condensate will wash it off when you run the system. Others need to be rinsed off. Follow the instruction on the spray. If rinsing is needed, place some old towels under the coil and rinse with clean water. If this does not work, the evaporator will need to be removed for cleaning and getting a technician to do is advisable.
I had my evaporator coil replacement done earlier this year when it started leaking. Now the air conditioner is not working again and I am told that the evaporator coil is blocked. What does this mean and why did it happen?
When a coil is replaced the normal practice is to purge the system with nitrogen to flush out any air and contaminants. The evaporator is then pressurized and placed in a vacuum to check for leaks. If leaks are found, they are repaired and the flushing is done again. This ensures that the coil is clean and free from any material that could with use, block the tube. It could be that the system was not completely flushed at the time it replaced.
What is the best way to thaw a frozen indoor air conditioner evaporator?
Turn the cooling off using the
and let the fan run. This will allow warm air to flow over the evaporator and melt the ice. A common reason for an evaporator to become covered with ice is inadequate air flow over it. Please check the
and if it is dirty or damaged, clean or replace it.
The evaporator on my Lennox air conditioner has a leak. Can it be repaired or is evaporator replacement required? And if evaporator coil replacement is necessary, can you tell me how much it will cost?
The viability of repairing the leak depends on where on the coil it is. It is a very tricky job. Many technicians do not approve of coil repair as even if the repair is done, there may be problems with the condensation not dripping off properly and falling outside the drain pan. As for the cost, indicative prices are: labor – 3 hours; coil - $500 to $700 (without dealer markup); refrigerant – up to $40 per pound (you may need 10 pounds); miscellaneous items - $100. Add to this freight and the technician’s margin. Please note that these are all very approximate figures which may vary considerably.
The evaporator coils on my air conditioner keep freezing up blocking the air flow. I’ve replaced the air filter and cleaned the coils. The fan seems to be okay. What is causing this and what should I do?
If the filter and evaporator are clean and blower working properly, the most likely cause of the evaporator freezing is a low refrigerant level. This can be a complex job and handling the refrigerant requires certification. It would be best to get a technician to locate and repair the leak and refill the refrigerant.
The efficiency of an evaporator can be affected by dirt, physical damage or impurities in the circulating gas which can cause blockages in the tubes. When dealing with evaporator problems, follow the instructions given in the owner’ manual. Evaporator’s are delicate and easily damaged. If the manual does not cover the problem you are facing, getting expert help is advisable.
Recent Evaporator Questions
What should it cost to have the 1/4 inch copper tubes, capoles,
what should it cost to have the 1/4 inch copper tubes, capoles, compressor, heat exchanger and evaporator replaced on a sub zero?
My apartment has a strange metallic odor ever since I turned
My apartment has a strange metallic odor ever since I turned on the AC. first time I've had this problem in 2 years. I suspect a Freon or r410a leak. How much refrigerant would it take to be a suffocation hazard?
My daughter bought an old house (100 yrs old) and it has a
My daughter bought an old house (100 yrs old) and it has a HVAC under the house.
There is no basement. It is under the master bedroom.
The compressor is not under the house.
Is it safe to have the heating unit under the house?
And can you recommend a unit that I could also out on the outside of the house like the compressor. Its about 1500 SF.
View More HVAC Questions
3 HVAC Technicians are Online Right Now
Ask Your Own HVAC Question
Ask Your Question Now
Ask a HVAC question
Type Your HVAC Question Here...
3 HVAC Technicians are Online Now
In The News
How JustAnswer Works:
Ask an Expert
Get a Professional Answer
Ask Followup Questions
100% Satisfaction Guarantee
Ask a HVAC Technician
Get a Professional Answer. 100% Satisfaction Guaranteed.
3 HVAC Technicians are Online Now
Type Your HVAC Question Here...
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.
Become a Professional
Terms of Service
Privacy & Security
© 2003-2015 JustAnswer LLC