Our hvac instructor told us to come next season with a very good understanding about the accumulator, high and low pressure switch ,oil separator, liquid receiver and last but not least charging pin ... chasing dreams becomes very difficult but i will never give up ...i hope i can get to know ppl like you sir ...thank you for this playlist and i hope can watch them all... thanks from Tunisian 🇹🇳in Qatar 🇶🇦
Outstanding video, and great reminder to always keep learning. Recently learned about these in school but didn’t know that you need to change these when you have a compressor burnout. Excellent and clear explanation of everything. Great tip about the naming, to call it a “suction line accumulator” to help you remember it’s location. Naming different components in this way has helped me a lot.
Hello sir i watch your videos and it help enhancing my knowledge and the way you explain everything is just amazing. You are a great teacher. I have one lil request if you could make video series on components selection like how and on what basis we select compressor condenser etc. plz consider my request
Based on this highly informative video it would seem that the density of the refrigerant must be lower than that of the oil; otherwise the oil would float to the top and not be sucked into the small orifice at the bottom of the accumulator.
I love how you are thinking. It's quite fascinating how the density, reliability and viscosity all work together. Here is a publication testing POE on HFO refregerants. pubs.acs.org/doi/10.1021/acs.jced.0c00431#
Thank you Mr. Ty for this nice video. The orifice in the bottom why not pull liquid refrigerant only oil? If the compressor replaced how to clean EEV? Thanks.🌿
Thanks for the video. What happens to the remaining refrigerant liquid inside the Suction Accumulator ? Is it going to vaporize ? Should the Suction Accumulator be insulated or not because a lot of customers are insulating ? If it is insulated from exterba heat then how does the liquid Refrigerant inside the said Suction Accumulator evaporate?
Thanks and great question. For the most part they should not be insulated so the heat from the accumulator can help boil off the refrigerant. In some cases they are insulated to prevent condensation in unwanted areas. Some argue that insulation reduces condensation and rust so the accumulator lasts longer. Others argue the insulation traps the condensation that's inevitable, preventing it from drying out and speeding up rust. I find it depends on the climate and the specific application but in general no insulation.
@@love2hvac Oh yeah one more question : With the volatile Refrigerant liquid " trapped " inside the Suction Accumulatir , is there a potency of Vapour Pressure rising up to a dangerously explosive level especially when the compressor is NOT running ( off condition ) and must the suction accumulatr be equipped with a Pressure Relief Valve as a precautionary measure ? Last one : Is there normally a drainage facility at the bottom of the Suction Accumulator in case we would like to do a fast draining ? And why isnt there a sight glass on the Suction Accmulator so that we can know what the exact level of refrigerant liquid inside the Suction Accumulator so that we can decide if it is already too high and need the so - called fast draining if any ?
@@thunderdragon888 Like a receiver, they are sized to hold the whole change pluss 20% vapor to allow for expansion. If there is expansion the pressure dissipates across the entire suction side. In the event both of the above is still not enough, there is a fuss le link welded into the accumulator that ruptured to allow controlled venting of the refrigerant. No drain port installed. No sight glass because of cost. I would love to have all compressors with an oil sight glass and liquid receivers to have a liquid level glass but it costs too much. Ideally the suction accumulator would always be vapor and not have much liquid refrigerant in it at all.
@@love2hvac Thank you again for the great explanation. I think the Suction Accumulator with some accessories as mentioned by you might have been produced by some reputable HVACR companies such as Parker, Danfoss, Emerson, etc......but in some areas or countries, there are a lot of homemade or local workshop - made Suction Accumulators which mostly are not well calculated in terms of holding capacity and NOT equipped with some of the accessories such as : fuss le link etc ....as well ..and also a lot of the Suction Accumulators are being insulated ....so you can imagine if the Liquid Floodback rate is suddenly high and with all the excessive liquid flowing and settling into the well-insulated Suction Accumulator for some time and Compressors are in off condition, I can imagine that it resembles a ticking time bomb waiting to explode doesnt it ?
How would the oil make it up and out through the output line on the accumulator? Wouldnt it just collect in the line and the vapor refrigerant would just bubble through it from the compressor suction, similar to how a water bong works :), thanks!
Since you talked about flushing, how do you perform flushing of the refrigerant lines? I heard a few different techniques but I would love to hear yours!
I like using the hillmore kit that sends an actual "pig" through the line sets that push the oils and debris out. I don't like the flush chemicals as they are hard to get back out
What's your thought on adding an accumulator on a system? For low load conditions with a fan cycle switch (on the condenser fan motor). Right now there is only a fan cycle switch and it's working great at 66°F 🙈. Yes I do have SH lol
As long as your maintaining superheat your likely okay. I have added accumulators to computer rooms units and some custom refrigeration applications. But you could add it to any system it's just a lot of work.
I have a system that has had a compressor just changed and company that changed it went bankrupt. I’ve been sent out to evacuate and charge. I charged and system was making strange hissing sound and showing low evaporator pressure, normal head pressure, low suction line temp, 4K super heat and the line going after the suction burnout drier into the accumulator and out into the compressor were iced up and compressor was louder than I have found usually (scroll AC compressor) Any chance the screen/orifice in the bottom is blocked and the charge of the system and oil is filling up in the accumulator not being able to boil off and go into the compressor? It’s got me stumped otherwise haha
There is a lot I will make a few notes. In short your flooding the compressor. More information needed. #1 compressors don't die they are murdered. The real question is what killed the old compressor? It will likely kill the new one. #2 was the system brazes in with a flow of nitrogen? Oxidation forms inside the lines and clogesetering devices and screens. #3 how many microns of vacuum where pulled? Deep evacuation is essential to dehydration and life of the compressor. #4 Liquid line filter drier, there should only be 1. Too often I see the original left behind the valves inside the unit and a new one added after the vlabe outside the unit. There can only be one and check for temperature drop acosss it. The screen before the metering device should also be checked for restrictions and oxidation. #5 suction line filter driers are not to be left for more than 72 hrs. Come back recheck for pressure drop, if there is it needs to be replaced (with the liquid drier). Recheck max of 72 hrs. Repeat untill no pressure drop, then remove the suction drier and one last time replace the liquid line drier. #6 suction line accumulator, was it replaced with the new compressor? If not was the oil drained inspected and measured? There is a screen and orifice inside that can get clogged and trap oil. OPERATION #1 AIR FLOW, the most, the most overlooked and misunderstood part of the HVAC system. There must be proper airflow across the evaporator or the refregerant cannot boil to a vapor. The TXV often gets blamed for bad airflow. The true flow grid is the most effective way of measuring airflow. Airflow is a number more important than gauges. #2 what metering device is being used. After airflow the metering device is the next step. Fixed orifice we need to know the outdoor temperature and the return air wet bulb to calculate target superheat. If TXV, after airflow, we need to ensure proper subcooling to the metering device check superheat to see if it's maintaining the correct evaporator superheat. Usually 8-12 at the evaporator, 18-20 at the compressor. #3 MEASURMENTS I recommend the Measurequick app but important numbers for remote diagnostics CFM airflow across the evaporator. Evaporator condition. Metering Device type. Refregerant type. Superheat at the evaporator coil. Superheat at the compressor suction. Superheat at the compressor discharge. Subcooling at the condensor Subcooling before the metering device. Temperature of the air entering the compressor and liquid saturation temperature for condensor TD (STOA) Liquid line temperature to calculate approach. Return air temperature and supply air temperature to calculate delta T Return air temperature and suction saturated to calculate evaporator TD. Return air wet bulb and supply air wet bulb to calculate capacity. Temperature drop across the liquid filter drier. Pressure drop across suction drier. Compressor model number to find the compressor performance chart. Compressor amps with suction and discharge pressure to compare with the compressor performance chart. Voltage at startup and voltage running.
The liquid refrigerant boil to a vapor in the bottom, absorbing heat, as it does the temperature drops and when it drops low enough it freezes. I would also check for proper airflow, metering device operation and proper charge.
Maybe a stupid question. But, what if you use acidaway, and use it before the suction accumulator (maybe use vacum to get it in the lineset before the accumulator, or in the accumulator), so that it will "blend" in before the compressor. Will it work.
To "neutralize" an acid, you do so by adding a base or alkyline chemical to it. A few things about this. 1 There must be a correct amount of alkyline added to neutralize the acid. If not, the system remains acidic OR it can go to an alkyline if you add too much. 2 Once the Acid/base reaction is done, the chemical byproducts of that reaction are WATER and a form salt. The best way is to use filter driers designed for acid removal. The issue with the suction accumulator is the oil pickup in the bottom. The orifice can become plugged and cause oil return issues to the compressor.
The pipe wipper for the refrigerant lines. Link below For the coils and only for a burn out. I use a Rx11 flush. That product has received some bad attention from techs that to no get all of the product back out. After flushing the coils I use several nitrogen purges and then pull a vacuum down to around 200 microns to know it's all boiled out. www.trutechtools.com//Pipe-Wiper-Refrigerant-Line-Cleaner--Residential-Kit_p_10450.html?gclid=CjwKCAjw87SHBhBiEiwAukSeUY1zQLnOCaEaQHSjh5PfFzOGOnjvUpBuUzXbVnh5Hu2mJmTXQDrynRoCEM0QAvD_BwE
Our hvac instructor told us to come next season with a very good understanding about the accumulator, high and low pressure switch ,oil separator, liquid receiver and last but not least charging pin ... chasing dreams becomes very difficult but i will never give up ...i hope i can get to know ppl like you sir ...thank you for this playlist and i hope can watch them all... thanks from Tunisian 🇹🇳in Qatar 🇶🇦
Excellent exposition of different types of accumulators.
Thank you 🙏
"Compressor do not die they are murdered" How very true, words of wisdom. Hear this man out!
Outstanding video, and great reminder to always keep learning. Recently learned about these in school but didn’t know that you need to change these when you have a compressor burnout. Excellent and clear explanation of everything.
Great tip about the naming, to call it a “suction line accumulator” to help you remember it’s location. Naming different components in this way has helped me a lot.
MOSTLY THANKFUL SIR.... I'M HVAC TECH..... GOLDEN THUMBS UP..... 👍👍👍👍
You're a true teacher. That's why I subscribed
Thank you!
Ty, I wished I had you as my Refeigation instructor/ teacher. 🇬🇾🇬🇾🇬🇾🇬🇾
What Skool you go to g.
Hello sir i watch your videos and it help enhancing my knowledge and the way you explain everything is just amazing. You are a great teacher. I have one lil request if you could make video series on components selection like how and on what basis we select compressor condenser etc. plz consider my request
I will see what I can do but that's where we get into System design which is heavy in math
@@love2hvac Not an issue sir anyway you have made critical concepts very easy to understand, same way please try to make with simple possible way.
Nice and explained in perfect detail. Thanks
Thank you!
Wow amazing video
I love This channel ❤️❤️
Based on this highly informative video it would seem that the density of the refrigerant must be lower than that of the oil; otherwise the oil would float to the top and not be sucked into the small orifice at the bottom of the accumulator.
I love how you are thinking.
It's quite fascinating how the density, reliability and viscosity all work together. Here is a publication testing POE on HFO refregerants.
pubs.acs.org/doi/10.1021/acs.jced.0c00431#
Thank you for you training its helped me a lot understanding
Could you please make an air flow ducked work
I will eventually get there. It's taking longer toan expected to get these done.
Thank you very much and God bless you
You really know your stuff
Thank you Mr. Ty for this nice video. The orifice in the bottom why not pull liquid refrigerant only oil? If the compressor replaced how to clean EEV? Thanks.🌿
Thanks for the video. What happens to the remaining refrigerant liquid inside the Suction Accumulator ? Is it going to vaporize ? Should the Suction Accumulator be insulated or not because a lot of customers are insulating ? If it is insulated from exterba heat then how does the liquid Refrigerant inside the said Suction Accumulator evaporate?
Thanks and great question.
For the most part they should not be insulated so the heat from the accumulator can help boil off the refrigerant.
In some cases they are insulated to prevent condensation in unwanted areas.
Some argue that insulation reduces condensation and rust so the accumulator lasts longer.
Others argue the insulation traps the condensation that's inevitable, preventing it from drying out and speeding up rust.
I find it depends on the climate and the specific application but in general no insulation.
@@love2hvac Ok noted with thanks....
@@love2hvac Oh yeah one more question : With the volatile Refrigerant liquid " trapped " inside the Suction Accumulatir , is there a potency of Vapour Pressure rising up to a dangerously explosive level especially when the compressor is NOT running ( off condition ) and must the suction accumulatr be equipped with a Pressure Relief Valve as a precautionary measure ? Last one : Is there normally a drainage facility at the bottom of the Suction Accumulator in case we would like to do a fast draining ? And why isnt there a sight glass on the Suction Accmulator so that we can know what the exact level of refrigerant liquid inside the Suction Accumulator so that we can decide if it is already too high and need the so - called fast draining if any ?
@@thunderdragon888
Like a receiver, they are sized to hold the whole change pluss 20% vapor to allow for expansion.
If there is expansion the pressure dissipates across the entire suction side.
In the event both of the above is still not enough, there is a fuss le link welded into the accumulator that ruptured to allow controlled venting of the refrigerant.
No drain port installed.
No sight glass because of cost. I would love to have all compressors with an oil sight glass and liquid receivers to have a liquid level glass but it costs too much.
Ideally the suction accumulator would always be vapor and not have much liquid refrigerant in it at all.
@@love2hvac Thank you again for the great explanation. I think the Suction Accumulator with some accessories as mentioned by you might have been produced by some reputable HVACR companies such as Parker, Danfoss, Emerson, etc......but in some areas or countries, there are a lot of homemade or local workshop - made Suction Accumulators which mostly are not well calculated in terms of holding capacity and NOT equipped with some of the accessories such as : fuss le link etc ....as well ..and also a lot of the Suction Accumulators are being insulated ....so you can imagine if the Liquid Floodback rate is suddenly high and with all the excessive liquid flowing and settling into the well-insulated Suction Accumulator for some time and Compressors are in off condition, I can imagine that it resembles a ticking time bomb waiting to explode doesnt it ?
1 MAKE 100 SURE REFRIGERATION SYSTEM IS CLEAN WITH DRYERS, BURNOUTS DRYERS...
How would the oil make it up and out through the output line on the accumulator? Wouldnt it just collect in the line and the vapor refrigerant would just bubble through it from the compressor suction, similar to how a water bong works :), thanks!
Since you talked about flushing, how do you perform flushing of the refrigerant lines? I heard a few different techniques but I would love to hear yours!
I like using the hillmore kit that sends an actual "pig" through the line sets that push the oils and debris out. I don't like the flush chemicals as they are hard to get back out
What's your thought on adding an accumulator on a system? For low load conditions with a fan cycle switch (on the condenser fan motor). Right now there is only a fan cycle switch and it's working great at 66°F 🙈. Yes I do have SH lol
As long as your maintaining superheat your likely okay.
I have added accumulators to computer rooms units and some custom refrigeration applications.
But you could add it to any system it's just a lot of work.
I have a system that has had a compressor just changed and company that changed it went bankrupt. I’ve been sent out to evacuate and charge. I charged and system was making strange hissing sound and showing low evaporator pressure, normal head pressure, low suction line temp, 4K super heat and the line going after the suction burnout drier into the accumulator and out into the compressor were iced up and compressor was louder than I have found usually (scroll AC compressor) Any chance the screen/orifice in the bottom is blocked and the charge of the system and oil is filling up in the accumulator not being able to boil off and go into the compressor? It’s got me stumped otherwise haha
There is a lot I will make a few notes.
In short your flooding the compressor. More information needed.
#1 compressors don't die they are murdered. The real question is what killed the old compressor? It will likely kill the new one.
#2 was the system brazes in with a flow of nitrogen? Oxidation forms inside the lines and clogesetering devices and screens.
#3 how many microns of vacuum where pulled? Deep evacuation is essential to dehydration and life of the compressor.
#4 Liquid line filter drier, there should only be 1. Too often I see the original left behind the valves inside the unit and a new one added after the vlabe outside the unit. There can only be one and check for temperature drop acosss it. The screen before the metering device should also be checked for restrictions and oxidation.
#5 suction line filter driers are not to be left for more than 72 hrs. Come back recheck for pressure drop, if there is it needs to be replaced (with the liquid drier). Recheck max of 72 hrs. Repeat untill no pressure drop, then remove the suction drier and one last time replace the liquid line drier.
#6 suction line accumulator, was it replaced with the new compressor? If not was the oil drained inspected and measured? There is a screen and orifice inside that can get clogged and trap oil.
OPERATION
#1 AIR FLOW, the most, the most overlooked and misunderstood part of the HVAC system. There must be proper airflow across the evaporator or the refregerant cannot boil to a vapor. The TXV often gets blamed for bad airflow. The true flow grid is the most effective way of measuring airflow. Airflow is a number more important than gauges.
#2 what metering device is being used. After airflow the metering device is the next step. Fixed orifice we need to know the outdoor temperature and the return air wet bulb to calculate target superheat.
If TXV, after airflow, we need to ensure proper subcooling to the metering device check superheat to see if it's maintaining the correct evaporator superheat. Usually 8-12 at the evaporator, 18-20 at the compressor.
#3 MEASURMENTS
I recommend the Measurequick app but important numbers for remote diagnostics
CFM airflow across the evaporator.
Evaporator condition.
Metering Device type.
Refregerant type.
Superheat at the evaporator coil.
Superheat at the compressor suction.
Superheat at the compressor discharge.
Subcooling at the condensor
Subcooling before the metering device.
Temperature of the air entering the compressor and liquid saturation temperature for condensor TD (STOA)
Liquid line temperature to calculate approach.
Return air temperature and supply air temperature to calculate delta T
Return air temperature and suction saturated to calculate evaporator TD.
Return air wet bulb and supply air wet bulb to calculate capacity.
Temperature drop across the liquid filter drier.
Pressure drop across suction drier.
Compressor model number to find the compressor performance chart.
Compressor amps with suction and discharge pressure to compare with the compressor performance chart.
Voltage at startup and voltage running.
👍👍👍
Why do suction accumulator ice up??
The liquid refrigerant boil to a vapor in the bottom, absorbing heat, as it does the temperature drops and when it drops low enough it freezes.
I would also check for proper airflow, metering device operation and proper charge.
@@love2hvac so pressure, and temperature, on suction line not saturated?
Maybe a stupid question. But, what if you use acidaway, and use it before the suction accumulator (maybe use vacum to get it in the lineset before the accumulator, or in the accumulator), so that it will "blend" in before the compressor. Will it work.
To "neutralize" an acid, you do so by adding a base or alkyline chemical to it.
A few things about this.
1 There must be a correct amount of alkyline added to neutralize the acid. If not, the system remains acidic OR it can go to an alkyline if you add too much.
2 Once the Acid/base reaction is done, the chemical byproducts of that reaction are WATER and a form salt.
The best way is to use filter driers designed for acid removal.
The issue with the suction accumulator is the oil pickup in the bottom. The orifice can become plugged and cause oil return issues to the compressor.
🍺🥃👍🏻
what do you mean by "flushed the lines" when you replaced the bad accumulator you "flushed all the lines"? like with nitrogen or what?
The pipe wipper for the refrigerant lines. Link below
For the coils and only for a burn out. I use a Rx11 flush. That product has received some bad attention from techs that to no get all of the product back out. After flushing the coils I use several nitrogen purges and then pull a vacuum down to around 200 microns to know it's all boiled out.
www.trutechtools.com//Pipe-Wiper-Refrigerant-Line-Cleaner--Residential-Kit_p_10450.html?gclid=CjwKCAjw87SHBhBiEiwAukSeUY1zQLnOCaEaQHSjh5PfFzOGOnjvUpBuUzXbVnh5Hu2mJmTXQDrynRoCEM0QAvD_BwE
@@love2hvac thanks you're the man
OR FAILL... 😒😒😒😒