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Contents
What causes oil logged evaporator?
Refrigerant migration can cause the compressor’s crankcase to lose its oil, thus circulating the oil throughout the refrigeration system. This oil in circulation usually gets caught in the evaporator and can cause an oil-logged evaporator.
How do I get oil out of my HVAC system?
- Flush the entire system, including solvent and compressed air.
- Vacuum out the excess oil with a wet-dry vac.
- Flush the system with rubbing alcohol.
- Put oil back in the system.
Which of the following symptoms would be indicative of an oil logged evaporator?
| Question | Answer |
|---|---|
| which of the following symptoms would be indicative of an oil logged condenser | high discharge line pressure and low liquid line pressure |
| a partially iced over evaporator can be caused by | an undercharge |
| can be used for leak detection with all high pressure refrigerants | soap bubble solution |
What happens if too much oil in AC system?
If you add too much oil to the system, it may pool in various places of the system and can coat the inner walls of the evaporator and condenser coils. This will diminish their ability to absorb or dissipate heat, thereby bringing down the overall cooling performance.
Does Flushing AC remove oil?
Oil travels throughout the system carried by the refrigerant and has direct contact with the condenser, accumulator, hoses, evaporator, and tubes. If any debris particles enter the system, all components are at risk for damage. Flushing the AC removes the contamination and protects vital A/C parts.
Does evacuating the AC system remove all the oil?
To answer the question title, yes, you will have to add oil to the new refrigerant. Failure to do so will shorten the useful life of the A/C compressor’s bearings through lack of lubrication. This will invariably lead to premature death of the compressor.
Does AC oil stay in compressor?
Normally you do not need to add oil to your AC compressor after it is installed, unless your installing a new compressor or if their is a leak in you AC system. If you do need to add oil check the compressor specifications on how much oil is needed.
How do you fix a flooded evaporator in a car?
Apply an evap core cleaner and let it sit for 30 minutes. Rinse the treated AC evaporator core with water and a cloth or rag. Remove all the excess moisture and dry the evaporator core with a fan. Return the air conditioning system to its original set-up.
Can you mix PAG 46 and PAG 100?
➔ PAG oils are highly miscible with R134a (PAG oils 46 YF and 100 YF also with R1234yf) and are suitable for lubricating the air conditioning systems of most passenger and commercial vehicles.
How do you clean evaporator coils?
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. Reapply as needed.
How do you clean a clogged condenser?
- Inspect the Coils. Start by visually inspecting the coils for any noticeable damage. …
- Remove Debris With a Coil Brush. …
- Straighten the Coil Fins With a Fin Comb. …
- Wet the Coils and Coat With Coil Cleaner. …
- Wash Away the Coil Cleaner With Water.
What causes oil migration in refrigeration system?
Refrigerant migration occurs as a result of a difference in vapor pressure between the oil in the crankcase of the compressor and the refrigerant vapor in another part of the system.
What causes oil migration?
Hydrocarbons migrate from a position of higher potential energy to one of lower potential energy. The spatial location of these energy differences defines the expected migration path. There are many sources for this energy that causes oil and gas migration.
What causes oil to foam in a compressor crankcase?
When the compressor is started, the sudden reduction in crankcase pressure causes foaming of the oil-refrigerant mixture. Depending on the amount of refrigerant in the solution, this foam can fill the compressor housing and be pulled into the compressor suction.
How do you fix a flooded evaporator in a car?
Apply an evap core cleaner and let it sit for 30 minutes. Rinse the treated AC evaporator core with water and a cloth or rag. Remove all the excess moisture and dry the evaporator core with a fan. Return the air conditioning system to its original set-up.
The Professor: Systematic Troubleshooting an Oil-Logged Evaporator | 2012-08-06 | ACHRNEWS | ACHR News
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- Summary of article content: Articles about The Professor: Systematic Troubleshooting an Oil-Logged Evaporator | 2012-08-06 | ACHRNEWS | ACHR News Updating …
- Most searched keywords: Whether you are looking for The Professor: Systematic Troubleshooting an Oil-Logged Evaporator | 2012-08-06 | ACHRNEWS | ACHR News Updating Figure 1. Severely oil-logged evaporator Refrigerant migration deals with refrigerant migrating back to the compressor’s crankcase during the off cycle. This migration of refrigerant is due to a pressure difference between the compressor’s crankcase and the refrigerant. Refrigerant migration can cause the compressor’s crankcase to lose its oil, thus circulating the oil throughout the refrigeration system. This oil in circulation usually gets caught in the evaporator and can cause an oil-logged evaporator. Refrigerant flooding refers to liquid refrigerant entering the compressor’s crankcase during the on . . .how an evaporator can become oil logged,oil-logged evaporator,systematic troubleshooting
- Table of Contents:
Determining the Cause of a Restricted Liquid Line
Evaporator Determines Refrigeration System Efficiency
The Importance of a Clean Condenser
Oil Traps Protect the Compressor
Frosty Evaporator Will Prevent Correct Airflow
Report Abusive Comment
The Future of HVAC Refrigerants Are You Ready
Installation Techniques for Air Treatment Solutions
How do I remove oil from my car’s AC system? | Jerry
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How To Clean Car’s AC Condenser – YouTube
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clearing oil from oil logged evap
- Article author: hvac-talk.com
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- Summary of article content: Articles about clearing oil from oil logged evap I can easily blow out the condenser, but is there a way to clear out the evaporator without removing the cap tube? I know the oil will … …
- Most searched keywords: Whether you are looking for clearing oil from oil logged evap I can easily blow out the condenser, but is there a way to clear out the evaporator without removing the cap tube? I know the oil will … I have a customer with a True reach in that had the CPR valve fail closed. The resulting low flow rates caused the compressor to run out of oil and ruin the rods and pistons.
When I tore down and rebuilt the compressor it was missing about half the oil. Since there was no leaks, I’m assuming the oil must be in the coils and piping.
I can easily blow out the condenser, but is there a way to clear out the evaporator without removing the cap tube?
I know the oil will return once
- Table of Contents:
Whath to do with a logged coil evaporator / condenser?
- Article author: www.refrigeration-engineer.com
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- Summary of article content: Articles about Whath to do with a logged coil evaporator / condenser? We remove the refrigerant, put a service hose and a ball valve at the end of the gear oil pum, and we pinch the contactor, at the first time … …
- Most searched keywords: Whether you are looking for Whath to do with a logged coil evaporator / condenser? We remove the refrigerant, put a service hose and a ball valve at the end of the gear oil pum, and we pinch the contactor, at the first time … condenser, evaporator, logged, oil, system, drawing, pipeline, information, slopes, pipes, soction, wrong, piping, suction, donot, forget, antacid, color, whath, thing, worry, important, acidityHi to you all.
This is a new problem to me.
I will describe the system;
20TR condensr unit, two scroll compresor York brand.
20TR evaporator unit York.
220V , R22.
The condenser and evaporator are no far apart, a 10-25feet as much,in the same floor level. - Table of Contents:
Whath to do with a logged coil evaporator condenser
Re Whath to do with a logged coil evaporator condenser
Re Whath to do with a logged coil evaporator condenser
Re Whath to do with a logged coil evaporator condenser
Re Whath to do with a logged coil evaporator condenser
Re Whath to do with a logged coil evaporator condenser
Re Whath to do with a logged coil evaporator condenser
Re Whath to do with a logged coil evaporator condenser
Re Whath to do with a logged coil evaporator condenser
Re Whath to do with a logged coil evaporator condenser
Re Whath to do with a logged coil evaporator condenser
Re Whath to do with a logged coil evaporator condenser
Re Whath to do with a logged coil evaporator condenser
oil logged evaporator or bad txv? — Heating Help: The Wall
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- Summary of article content: Articles about oil logged evaporator or bad txv? — Heating Help: The Wall i am having a problem with a vertical self contained air cooled cool air ac unit.it started out that the unit was going off on low … …
- Most searched keywords: Whether you are looking for oil logged evaporator or bad txv? — Heating Help: The Wall i am having a problem with a vertical self contained air cooled cool air ac unit.it started out that the unit was going off on low … i am having a problem with a vertical self contained air cooled cool air ac unit.it started out that the unit was going off on low pressure.i tried to add some refrigerant and the low pressure did not rise.the body of the txv started to ice up.i thought it was a bad txv,i changed the txv,the unit operated the same.suction pressure was low (20 psi) and the high side was low (105 psi) this is an r22 unit with 5 lb.
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Tips For Troubleshooting The Low Side Of A Refrigeration System
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- Summary of article content: Articles about Tips For Troubleshooting The Low Side Of A Refrigeration System If the viscosity (thickness) is too high, oil will have a hard time returning from an evaporator and will surely cause oil-logging. Usually, the … …
- Most searched keywords: Whether you are looking for Tips For Troubleshooting The Low Side Of A Refrigeration System If the viscosity (thickness) is too high, oil will have a hard time returning from an evaporator and will surely cause oil-logging. Usually, the … The low side of a refrigeration system usually houses the evaporator, suction line, and any accessory components located within the suction line. Accessory …
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Tips For Troubleshooting The Low Side Of A Refrigeration System
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6.11 Oil in evaporators – SWEP
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- Summary of article content: Articles about 6.11 Oil in evaporators – SWEP The flow in the evaporator is also generally upwards, which requires the oil to be lifted by the refrigerant flow. Because the evaporation temperature of the … …
- Most searched keywords: Whether you are looking for 6.11 Oil in evaporators – SWEP The flow in the evaporator is also generally upwards, which requires the oil to be lifted by the refrigerant flow. Because the evaporation temperature of the …
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The Professor: Systematic Troubleshooting an Oil-Logged Evaporator
Figure 1. Severely oil-logged evaporator
Refrigerant migration deals with refrigerant migrating back to the compressor’s crankcase during the off cycle. This migration of refrigerant is due to a pressure difference between the compressor’s crankcase and the refrigerant. Refrigerant migration can cause the compressor’s crankcase to lose its oil, thus circulating the oil throughout the refrigeration system. This oil in circulation usually gets caught in the evaporator and can cause an oil-logged evaporator.
Refrigerant flooding refers to liquid refrigerant entering the compressor’s crankcase during the on cycle. Flooding can cause flashing of the oil in the compressor’s crankcase because of the liquid refrigerant boiling under the oil. This phenomenon can also cause the compressor to lose its oil and circulate it throughout the refrigeration system. Excessive oil in the system will again get caught in the evaporator and cause an oil logged evaporator. This article will explore the problems associated with an oil-logged evaporator and a compressor’s crankcase low on oil.
Systematic Troubleshooting
Systematic troubleshooting using a system check sheet is still the best method for the conscientious service technician to pinpoint hard-to-find system problems. This article explores how evaporators can become oil logged, and includes symptoms with explanations of a system with an oil-logged evaporator. This refrigeration system incorporates HFC-134a as the refrigerant. It has a thermostatic expansion valve (TXV) for the metering device and a receiver at the condenser outlet.
Listed below are ways an evaporator can become oil logged.
• A flooded compressor circulating oil at start-up;
• Too much oil in the system;
• System not piped correctly (no oil traps or piping too large);
• Liquid migration during off cycle, causing crankcase oil foaming on start-ups;
• TXV out of adjustment (too little superheat causing a refrigerant-flooded compressor);
• Not enough defrost periods for low-temperature application machines; and
• Wrong type or viscosity of oil.
Oil in a refrigeration system has many functions. These functions are:
1. Lubricates;
2. Deadens noise;
3. Transfers heat – cools;
4. Reduces friction;
5. Minimizes mechanical wear; and
6. Seals valves — prevents blow-by in valves and other mechanical parts.
Oil usually logs in the evaporator because it is the coldest component with the largest tubes, thus the slowest refrigerant velocity. Oil logged in the evaporator will coat the inner wall of the coil and reduce the heat transfer through the walls. This will cause a loss of capacity and poor performance. The compressor will be robbed of some of its crankcase oil and run with a lower than normal oil level. This may score or ruin mechanical parts in the compressor.
Too high of a viscosity oil will also be hard to return from an evaporator and will surely cause oil logging. Usually, the heat from the defrost heaters will warm and thin the oil in the evaporator so it can be returned to the compressor once the compressor starts up. This will happen only if the right viscosity (thickness) of oil is used.
If a suction line is oversized, the refrigerant velocity will be decreased. This will prevent the oil from moving through the suction line to the compressor’s crankcase. Remember, it is the refrigerant velocity that will move the oil through the refrigeration system’s piping.
The Check List
Figure 1 is a system check sheet for an oil-logged evaporator. Pressures and temperatures will vary depending on the severity of the oil logging. Symptoms of an oil-logged evaporator are:
• Noisy compressor;
• Low oil level in sight glass on compressor’s crankcase;
• TXV having a hard time controlling superheat (hunting);
• Low evaporator and compressor superheat; and
• Warmer than normal box temperatures with loss of capacity and lower than normal suction pressure.
Noisy compressor — The compressor may be noisy because of the lack of oil. Metallic sounds may be heard from the lack of lubrication or parts out of tolerance from excessive wear. Oil is a sound deadener as well as a lubricant.
Low oil level in compressor’s sight glass — Because a lot of the oil is in the evaporator, the crankcase will be low on oil. In fact, the entire system’s components excluding the compressor may have too much oil. This would cause a low oil level in the compressor’s crankcase sight-glass. Many times a compressor that is flooding with refrigerant will turn into an oil-pumper. The crankcase will be foaming from the liquid refrigerant flashing in it. Small oil droplets entrained in the oil will be pumped through the compressor. This will oil log many components in the system. The velocity of the refrigerant traveling through the lines and P-traps will try to return the oil from the system to the crankcase. Even an oil separator in the compressor’s discharge line may have a hard time keeping up with excess oil in circulation. However, oil will continue to get into the system if the compressor flooding situation is not remedied.
TXV having a hard time controlling superheat — The TXV will also see too much oil passing through it. The evaporator’s tailpipe will be oil logged and the inside of the tubes coated with oil. The remote bulb of the TXV at the evaporator outlet will have a hard time sensing a true evaporator outlet temperature because of the reduced heat transfer through the line. The TXV will hunt and keep trying to find itself. A constant superheat will not be maintained. The TXV remote bulb may sense a warmer than normal temperature from the oil insulating the inside of the line. This could make the TXV run a low superheat and flood or slug the compressor with refrigerant. Often the sight glass in the liquid line will be discolored with a yellowish or brown tint from refrigerant and oil flowing through it. Technicians may confuse this low superheat reading with an overcharge of refrigerant. However, an overcharge of refrigerant will give high head pressures and high condenser subcooling readings. TXV systems usually can tolerate a bit of an overcharge and still hold a good evaporator superheat if set properly. However, once the head pressures get too high, the TXV will soon overfeed the evaporator and show low superheat.
Low compressor superheat — Because the TXV may be running low superheat, this will cause the compressor (total) superheat to run lower.
Warmer than normal box temperatures with capacity losses — Because of the reduced heat transfer in both the condenser and evaporator from the excess oil coating the inner tubing, capacity will be decreased. The compressor will run longer trying to maintain a desired box temperature. Evaporator temperatures and pressures may run low because of the reduced heat transfer from the oil insulating the evaporator tubes. This will cause reduced mass flow rates and low evaporator pressures.
The service technician must recognize the symptoms brought upon by excessive oil in circulation in a refrigeration system. The service check sheet will be the No. 1 tool in helping the technician recognize that they have this hard-to-detect problem.
Publication date: 8/6/2012
Free Flashcards about AC
Question Answer
A liquid line filter drier should be placed between the condenser and the metering device
A temperature differential across a filter drier indicates restricted filter drier
a liquid receiver is used to store liquid refrigerant
an accumulator is used to prevent liquid refrigerant from reaching the compressor
a sight glass would normally be located in the liquid line before the metering device
bubbles in a sight glass could be an indication of refrigerant blend with a high temperature glide
A liquid to suction heat exchanger is often used to increase liquid sub cooling
the oil pressure safety switch is operated by the difference between crankcase pressure and oil pressure
a low pressure cut off switch is used to establish a minimum operating pressure in the evaporator
an energy recovery ventilator is an air to air heat exchanger to recover heat
which of the following is true of a solenoid valve in a pump down system it is located before the metering device
heat which causes a change in temperature of a substance is called sensible heat
heat added to a substance without a rise in temperature latent heat of vaporization
heat added to the refrigerant in a vapor state after the evaporation process is called superheat
the movement of heat by way of fluid or air is called convection
the movement of heat by direct contact is called conduction
zero psia is a pressure which cannot be further reduced
zero psig is the same as atmospheric pressure
the temperature at which moisture will start to condense from the air is called dew point temperature
what is the recommended residential indoor relative humidity for summer 50%
water will vaporize at what temperature in a 28 in hg vacuum 100 degrees F
the standard unit for measuring the quantity of heat in a substance is the British thermal unit BTU
which of the following symptoms would be indicative of an oil logged condenser high discharge line pressure and low liquid line pressure
a partially iced over evaporator can be caused by an undercharge
can be used for leak detection with all high pressure refrigerants soap bubble solution
when using an electronic leak detector the sensor probe should be moved at approximately 1 inch for every 2 seconds
moisture in a refrigeration system can cause compressor failure
in order to remove as much moisture as possible from a system triple evacuate the system to 500 microns with a deep vacuum pump
an overcharge of refrigerant will cause increased head pressure
A customer complains that their air conditioning system is running constantly, but not cooling enough. the suction line is very cold and the compressor is sweating the most likely cause is a restriction of the return air or a dirty evaporator
compressor was replaced unit is not cooling properly when you arrive and inspect the unit you find that evaporator seems to be starved for refrigerant on examining the condensing unit you find that the liquid line is sweating where it leaves the drier Debris from the burned out compressor has clogged the drier
an inefficient compressor is usually indicated by BLANK head pressure and Blank suction pressure lower the than normal/ higher than normal
what is not a symptom of a hermetic system that is low on refrigerant high head pressure
frost on the suction line indicates that its temperature is below the dew point and below 32 degrees F
when a TEV or a capillary tube is used as a metering device a low refrigerant charge will cause low head pressure
solid contaminants such as sludge and carbon from a sever hermetic compressor motor burn out are best removed by installing filter driers in both the liquid and suction lines
no cooling complaint unit to be completely out of refrigerant technician decides to use a trace amout of refrigerant and BLANK in order to pressurize the system an inert gas
system is started the compressor is noisy and running hot the most probable cause of the noise is low oil in the system
low operating pressures and low system amp draw this could be an indication of A low airflow across the evaporator
air or other non condensable gasses in a capillary tube air conditioning system will cause these sysmptoms low suction pressure and high discharge pressure
A refrigerant overcharge in a capillary tube air conditioning system will cause these symptoms high suction pressure and high discharge pressure
a compressor that has a broken valve will cause these symptoms high suction pressure and low discharge pressure
a low refrigerant charge in an air conditioning system will cause these symptoms low suction pressure and low discharge pressure
a faulty condenser fan motor on an air conditioning system will cause these sysmptoms high suction pressure and high discharge pressure
oil logged evaporator or bad txv?
i am having a problem with a vertical self contained air cooled cool air ac unit.it started out that the unit was going off on low pressure.i tried to add some refrigerant and the low pressure did not rise.the body of the txv started to ice up.i thought it was a bad txv,i changed the txv,the unit operated the same.suction pressure was low (20 psi) and the high side was low (105 psi) this is an r22 unit with 5 lb. total charge.i thought that maybe the power element on the new txv was bad, i changed it,but the unit operated the same.both times the system was pressure tested,evacuated,and the charge was weighed in.the suction pressure is low and the unit goes off on low pressure.i have blown through the unit with nitrogen, and there appears to be good flow,however once the unit is running the pressure is low and the unit shuts off.i have ruled out air flow, and and have calculated the unit is moving 1900 cfm of air (five ton unit) i do not know what else this can be but the whole txv is bad (a doa) or the evaporator is clogged.there is no temperature drop across the drier,and every time the body of the txv,and distributor ice over.any assistance,or suggestions would be much needed.thank you
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