Tool List- www.amazon.com/shop/acservicetech Support- www.patreon.com/acservicetech For those that are looking for the tools used in the videos: (Linked Below) Here is a link to Refrigerant hoses with valves used in the videos- amzn.to/2aBumVI Here is the Link for the Yellow Jacket Refrigerant Manifold Gauge Set used in the videos- amzn.to/2aenwTq Here is a link to the UEI DL389 Multimeter used in the videos- amzn.to/2av8s3q Here is a link to the Hilmor 4 port Aluminum Manifold Gauge Set- amzn.to/2m4QLik Here is a link to the Digital Refrigerant Scale used in the videos- amzn.to/2b9oXYl Here is a link to the Imperial 535-C Kwik Charge Vaporizer for Charging Refrigerant- amzn.to/2oge0u9 Other tool links can be found in the video description section. ACSERVICETECH is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.
I’ve worked on very large walk in equipment, where the receiver held 60 lbs of refrigerant. Their was a sight glass on the receiver, so we could always see the level. It had a water cooled condenser, with not a lot of storage space for refrigerant. The charge was checked after pump down, by looking into the receiver sight glass.
Your vids are PRO. I would like to see you as a guest on the podcasts of Cowboys of HVAC or HVAC School. I have 12+ yrs in commercial and your vids never get old. I am always picking up something from them.👍👍👍
Awesome video , I was always under the impression that the receiver was there to receive liquid back to the condenser when the box temp was satisfied and the solenoid closed (allowing the the unit to pump down ).... Btw , your tutorials are impressive. Thanks again for sharing the knowledge .
That receiver is certainly where the liquid will go during a pump down box but about all refrigeration units have them even if they don't have the solenoid due to the varying load. Thank you very much!
Thanks for the education. I now understand the function of the receiver. I converted a 3 ton heat pump from air/refrigerant to water/refrigerant. Have a TXV for A/C and an orifice for heat. Had to change the orifice diameter, but the TXV still does its job. I do however have to add 2 lbs of R22 when switching from A/C to heat mode. When switching back, I have to remove the 2 lbs. Do you think putting a 2 lb capacity receiver between the condenser and TXV will eliminate the need to change the charge each season?
Montgomery college MD.. and when I said used ..I mean as point of reference to clarify or explaining. the instructor is not using your material for profit .. don`t put in trouble .. lol
Damn dude u r good real good at teaching and r very knowledgeable. I believe ur the best hvac channel by far. I've been doing hvac not refirgeration for 6 years now and have not seen anyone make better videos than u. Can u please make videos on mini split systems like the condenser of a fujitsu or any other brand and all its parts. There is literally no good videos on explaining I've checked. Also the technical support of those companies have no idea either. Thanks a lot and go NJ
I am learning compressor oil flows in AC refrigerant systems. The condenser units of walking in freezer/cooler are normally sitting on the roof which is lower than evaporator. Is there any oil trap on these condenser units? Can you do a video about compressor oil travel in different systems? On an AC system if all refrigerant leak out, do you think if it is necessary to add more compressor oil? Is there any different effects on oil lost if the leak from liquid line close to compressor and leaks on suction line? and how to charge POE compressor oil when retrofit from R22 to newer refrigerants? from suction line or liquid line if the compressor is not removed from the system? I am learning by myself. I have learned a lot from you and bought your book. Thank you again!
good vid. a system like this with a full (to spec ) charge that has a sight glass. what would make the Freon not reach the sight glass (floating ball in top of tank) even if overfilled? TXV? but why? what should I be looking at?
When charging a refrigeration system with the door open at full load, if the sight glass is bubbling after 15 minutes then it is likely a low charge but could be clogged filter drier or txv not adjusted right. If a solenoid valve (if equipped) was before the sight glass and was closed, it would not allow refrigerant through. If after adding refrigerant, the bubbling goes away and it is solid liquid refrigerant going through which would look clear ,then that would be a full charge. You then monitor superheat after closing the walk in box door. Thanks
on this system (thermoking) it has a second sight glass that shows when the reservoir is full. the one you refer to is before that. usually we fill until first one (on the line) goes clear and then shortly after the one on reservoir floats a ball inside the glass. I was told the TXV could cause this not to fully fill properly.
How is it you're measuring superheat with a TXV? Shouldn't you be measuring subcool? Or, is it different for walk-in refrigerators as compared to traditional comfort cooling?
It is a lot different for checking the charge of a walk in compared to comfort cooling. Superheat is a big thing with refrigeration. When possible, you would like to have the door open to the walk in to drain the receiver tank and just 1 degree of subcooling to clear the site glass. Then close the walk in box and let the unit draw down while monitoring the superheat since the subcooling reading will rise as the box gets cooler and less refrigerant is needed in the evap coil, thanks JaffeJoFur, thanks!
sir please help me. im confused between A and D The expansion device is placed between which two components? a) Condenser and evaporator b) Compressor and condenser c) Evaporator and compressor d) Receiver and evaporator what do u think is the best answer. thank u
Thank you so much! So when someone says they are closing a valve and "pumping down a system" this is a service valve that stops the flow from the receiver to the TVX? The compressor keeps pumping until reaching near vacuum, a low pressure switch then turns off the compressor and the majority of refrigerant is trapped in the condenser and receiver? So what is the purpose of an accumulator? Are there systems that have both a receiver and accumulator?
That valve that you are referring to would be on top of the receiver which is different than this type. With a pump down system, the thermostat controls the solenoid valve and then the pressure switch controls the compressor. Accumulators are usually found on heat pumps, thanks! - this video explains the purpose of the accumulator as the refrigerant goes step by step through the heat pump in heating and cooling.- th-cam.com/video/2Ahzi1U0fYk/w-d-xo.html
You Rock! I got an HVACR community college degree back in the late '80s, but the program was in decline, the fossil who ran it said "all this ozone craptalk is commie propaganda" and the lab equipment was WWII surplus that was moved from one storage area to another. So my goatskin was all theory and no practice. Decided then that bartending in New Orleans was more fun and profitable. Now damn near 30 years later looking to get back into HVACR. In all the years of large operation F&B I was always the first to call a tech when some equipment was going squirrelly and hovered over them watching and asking questions. The past couple of years where I work, have started a condenser cleaning program on the fleet of 10-20 yr old equipment, have added Testo smart probes to my tool set and brought back a couple of scrap heap fridges to life in my spare time. Going for the EPA 608 test in a couple of weeks. Thanks for taking so much time creating content and responding to newbie questions.
Yeah, you need that license! That first paragraph is crazy. I do hear of a lot of people going through schools in the past and present and they are spending too much time in theory. Growing up in the trade, I knew I couldn't really understand until I could get my hands on it or at least visualize real equipment. Then I could understand the teaching!
Thank you very much for making these awesome videos and sharing your knowledge. Your videos are very helpful. Could you please make a video about defrost timer wiring and defrost cycle. Thank you!
Thanks for the information! Really liked the video but this didnt answer a question that's being brought up at work. I fully understand that subcooled liquid refrigerant is suppose to enter your metering device but my question is: what would happen is vapor refrigerant entered the metering device? What effects would that have on a system.
The only way you would have vapor going to the txv is if the unit is low on refrigerant or there is a liquid line restriction or the king valve on the top of the receiver was partially shut. It wouldn't have anything to do with the receiver. If vapor entered the txv then there would be no pressure change on the other side and therefor not saturated phase change in the coil which would result in no heat removal at the indoor coil. Have you looked up and watched the videos i put out on the refrigeration cycle? I did one on a wlak in cooler. Just look up ":acservicetech refrigeration cycle playlist" to look through those videos, thanks
In refrigeration after the receiver but you should have a sight glass as well and we try to drain the receiver by increasing the load to ambient if ever possible get the sight glass full of liquid and then close the door to the refrigerator unless you are following a manufacturer spec. Many times it is not possible to increase the load because of the product not being moved so we monitor superheat on the way down when lowering in temp thanks John!
in my area there is a lot of residential condensers used to cool a walk-in cooler. can you explain how this works for them? the condensers are oversized.
The main reason is that the condensor coils are a lot larger than a normal refrigeration outdoor unit so there is room in the coil for the added subcooled liquid. Thanks and great question!
acservicetech thank you thank you makes good sense. any kind rule of thumb for sizing? recently saw 3 ton condenser on a one ton Evap coil surprisingly working good. store owner is talking about putting a 4-ton condenser with two one ton Evap coils
i was always told when charging a walk in box fill the receiver 1/2 to 3/4 of the way while its running,in order to have enough refrigerant in system during high load situations. Have you heard about this?
Yes if you have the opportunity, create the high load to drain the receiver but still maintain enough refrigerant liquid to create the steady stream of liquid to the txv. I was speaking of a start up without product without other charging device other than a liquid sight glass. Thanks
every system should be charged to about 90 % capacity. there fore you should find the pump down capacity of your receiver. If the receiver is 10lb capacity then you should have 9 lbs of refrigerant in that system. this is for units 25 ft of line set or less.
Good video when you have and receiver and you don't know what level little trick is use a the small solder torch and move it a long side it will get cold and that where the level is where is start to frost.
Hi i have a question, i went to school for Hvacr and I've been a helper for this very small 4 man hvac company for 3 weeks and payed 10 dollars an hour full time, do you think its worth it to join an hvac union? Or just go for a bigger company? Im afraid of somebody hiring me as a non union worker and only being used for 1 season and then firing me which is what ive heard happens alot i really love this trade but feel i need guidance really love the videos by the way. Thank you.
I think every area is different. If I drive 1.5 hours north of my location, there are a lot of commercial companies. In my area there are not many commercial companies but many smaller companies. It really is about getting into the right company. A union may be nice as they would put you through an education apprenticeship with certain known raises but you could also do well if you found a real serious company. I started out at 10 dollars an hour 15 years ago and was up to $16 after 1.5 years. I think some employers are just thinking of times earlier on in their career unfortunately. In my opinion the lowest now would probably be closer to $13 an hour for a private company starting out but everyone has their reasons such as the age of the employee, experience level, first impression, amount of tools. It will also depend on if the company specializes in new construction only or changeouts, existing homes and service. Unions usually start out a little higher in most cases. Keep at it and learn. After 4 or 5 years in a good company, you will be very valuable, thanks and check out this video maybe too - th-cam.com/video/R7U_Kry1CBA/w-d-xo.html
Only if you open the door to the walk in box with the highest heat load possible. Going from bubbles to a clear liquid line sight at that moment will tell you that the receiver is drained and there is only one degree of subcooling. You wont be able to tell unless you start that process without being undercharged and having bubbles though, thanks
There is no receiver on a cap tube system, I use to do 100s of ice boxes in stores and the outside boxes. I all so see many techs put big liquid filters on cap tubes, big mistake. should use a strainer filter. ivanbennett.com/strainer.jpg Tell us why.
Hey Ivan, your comment was in the spam because it had the link, just getting to it now. Most refrigeration systems with cap tubing are packaged and are designed by the factory to be able to maintain at least some superheat while its running across its expected temps and conditions. A larger filter drier is not used do to its volume and the possibility of liquid flashing, as well strainers are built more in a way to keep the cap tube from possibly getting clogged. A receiver is used with a txv due to the varied volume of refrigerant allowed through the txv at different operating conditions, thanks
Tool List- www.amazon.com/shop/acservicetech
Support- www.patreon.com/acservicetech
For those that are looking for the tools used in the videos: (Linked Below)
Here is a link to Refrigerant hoses with valves used in the videos- amzn.to/2aBumVI
Here is the Link for the Yellow Jacket Refrigerant Manifold Gauge Set used in the videos-
amzn.to/2aenwTq
Here is a link to the UEI DL389 Multimeter used in the videos- amzn.to/2av8s3q
Here is a link to the Hilmor 4 port Aluminum Manifold Gauge Set-
amzn.to/2m4QLik
Here is a link to the Digital Refrigerant Scale used in the videos-
amzn.to/2b9oXYl
Here is a link to the Imperial 535-C Kwik Charge Vaporizer for Charging Refrigerant- amzn.to/2oge0u9
Other tool links can be found in the video description section.
ACSERVICETECH is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.
I’ve worked on very large walk in equipment, where the receiver held 60 lbs of refrigerant. Their was a sight glass on the receiver, so we could always see the level. It had a water cooled condenser, with not a lot of storage space for refrigerant. The charge was checked after pump down, by looking into the receiver sight glass.
Your vids are PRO. I would like to see you as a guest on the podcasts of Cowboys of HVAC or HVAC School. I have 12+ yrs in commercial and your vids never get old. I am always picking up something from them.👍👍👍
HVAC/R Junky I am following and recommend both of those sites as well.
Thank you both very much!
Probably the best explanation of what the receiver is for. Makes total sense the way you explain it. Your videos are awesome.
Thanks a lot! We also did a newer videos on the receiver aswell where it is cut apart, thanks!
Hey, Craig. Had to come back and watch these again. :)
Ac service tech all of your videos are done very well. Keep up the good work!
Thanks Lance!
Awesome video , I was always under the impression that the receiver was there to receive liquid back to the condenser when the box temp was satisfied and the solenoid closed (allowing the the unit to pump down ).... Btw , your tutorials are impressive. Thanks again for sharing the knowledge .
That receiver is certainly where the liquid will go during a pump down box but about all refrigeration units have them even if they don't have the solenoid due to the varying load. Thank you very much!
excellent video,I'm pretty green on medium and low temp systems. These videos help me out big time.
Thanks Matt!
Thanks for the education. I now understand the function of the receiver.
I converted a 3 ton heat pump from air/refrigerant to water/refrigerant. Have a TXV for A/C and an orifice for heat. Had to change the orifice diameter, but the TXV still does its job. I do however have to add 2 lbs of R22 when switching from A/C to heat mode. When switching back, I have to remove the 2 lbs. Do you think putting a 2 lb capacity receiver between the condenser and TXV will eliminate the need to change the charge each season?
your videos and explanation are used in our fundamental HVAC-R college class ..that how i find out about your channel.
nice job
Very Cool, What College?
Montgomery college MD.. and when I said used ..I mean as point of reference to clarify or explaining.
the instructor is not using your material for profit .. don`t put in trouble .. lol
No no, I was just wondering. Thanks a lot. I appreciate the comment!
Very informative. Thanks for the explanation.
Glad it was helpful!
thank you acservicetech for sharing!!!! I have learned a lot from your video's you are very professional!!!
Thanks Jimbola77!
Damn dude u r good real good at teaching and r very knowledgeable. I believe ur the best hvac channel by far. I've been doing hvac not refirgeration for 6 years now and have not seen anyone make better videos than u. Can u please make videos on mini split systems like the condenser of a fujitsu or any other brand and all its parts. There is literally no good videos on explaining I've checked. Also the technical support of those companies have no idea either. Thanks a lot and go NJ
Thank you very much and thanks for letting me know what you would like to see!
Great video can you do more refrigeration videos like you do for A/C just getting into refrigeration it's a lot different than heat/air thanks
Thanks for letting me know what you would like to see!
Another great video, well explained.
Thanks a lot Luis!
I am learning compressor oil flows in AC refrigerant systems. The condenser units of walking in freezer/cooler are normally sitting on the roof which is lower than evaporator. Is there any oil trap on these condenser units? Can you do a video about compressor oil travel in different systems? On an AC system if all refrigerant leak out, do you think if it is necessary to add more compressor oil? Is there any different effects on oil lost if the leak from liquid line close to compressor and leaks on suction line? and how to charge POE compressor oil when retrofit from R22 to newer refrigerants? from suction line or liquid line if the compressor is not removed from the system?
I am learning by myself. I have learned a lot from you and bought your book. Thank you again!
Is charging box cooler different from a comforter cooler? Sorry I’m new to AC. Thank you
Thank you very much for posting these videos!
Thanks r aeronca!
Off topic: can I install a liquid liquid filter drier near condenser? R22 system. Non txv
Thank you for your videos and your explanation. Your awesome!
Glad to help Vincent!
Great tutorial for newbies!
Thanks Dale!
good vid.
a system like this with a full (to spec ) charge that has a sight glass. what would make the Freon not reach the sight glass (floating ball in top of tank) even if overfilled? TXV? but why? what should I be looking at?
When charging a refrigeration system with the door open at full load, if the sight glass is bubbling after 15 minutes then it is likely a low charge but could be clogged filter drier or txv not adjusted right. If a solenoid valve (if equipped) was before the sight glass and was closed, it would not allow refrigerant through. If after adding refrigerant, the bubbling goes away and it is solid liquid refrigerant going through which would look clear ,then that would be a full charge. You then monitor superheat after closing the walk in box door. Thanks
on this system (thermoking) it has a second sight glass that shows when the reservoir is full. the one you refer to is before that. usually we fill until first one (on the line) goes clear and then shortly after the one on reservoir floats a ball inside the glass.
I was told the TXV could cause this not to fully fill properly.
How is it you're measuring superheat with a TXV? Shouldn't you be measuring subcool? Or, is it different for walk-in refrigerators as compared to traditional comfort cooling?
It is a lot different for checking the charge of a walk in compared to comfort cooling. Superheat is a big thing with refrigeration. When possible, you would like to have the door open to the walk in to drain the receiver tank and just 1 degree of subcooling to clear the site glass. Then close the walk in box and let the unit draw down while monitoring the superheat since the subcooling reading will rise as the box gets cooler and less refrigerant is needed in the evap coil, thanks JaffeJoFur, thanks!
Great explanation!
Thanks Shawn!
sir please help me. im confused between A and D
The expansion device is placed between which two components?
a) Condenser and evaporator
b) Compressor and condenser
c) Evaporator and compressor
d) Receiver and evaporator
what do u think is the best answer. thank u
D
Thank you so much!
So when someone says they are closing a valve and "pumping down a system" this is a service valve that stops the flow from the receiver to the TVX? The compressor keeps pumping until reaching near vacuum, a low pressure switch then turns off the compressor and the majority of refrigerant is trapped in the condenser and receiver?
So what is the purpose of an accumulator?
Are there systems that have both a receiver and accumulator?
That valve that you are referring to would be on top of the receiver which is different than this type. With a pump down system, the thermostat controls the solenoid valve and then the pressure switch controls the compressor. Accumulators are usually found on heat pumps, thanks! - this video explains the purpose of the accumulator as the refrigerant goes step by step through the heat pump in heating and cooling.- th-cam.com/video/2Ahzi1U0fYk/w-d-xo.html
You Rock!
I got an HVACR community college degree back in the late '80s, but the program was in decline, the fossil who ran it said "all this ozone craptalk is commie propaganda" and the lab equipment was WWII surplus that was moved from one storage area to another. So my goatskin was all theory and no practice. Decided then that bartending in New Orleans was more fun and profitable.
Now damn near 30 years later looking to get back into HVACR. In all the years of large operation F&B I was always the first to call a tech when some equipment was going squirrelly and hovered over them watching and asking questions. The past couple of years where I work, have started a condenser cleaning program on the fleet of 10-20 yr old equipment, have added Testo smart probes to my tool set and brought back a couple of scrap heap fridges to life in my spare time.
Going for the EPA 608 test in a couple of weeks.
Thanks for taking so much time creating content and responding to newbie questions.
Yeah, you need that license! That first paragraph is crazy. I do hear of a lot of people going through schools in the past and present and they are spending too much time in theory. Growing up in the trade, I knew I couldn't really understand until I could get my hands on it or at least visualize real equipment. Then I could understand the teaching!
Thank you very much for making these awesome videos and sharing your knowledge. Your videos are very helpful. Could you please make a video about defrost timer wiring and defrost cycle. Thank you!
Thank you for letting me know what you would like to see!
ty do u have any videos on wireing a float switch on a drain pan
Here it is- th-cam.com/video/DLYW78mHfbA/w-d-xo.html&list=PLxnHR5_D2ojzDfU1IjPpzdhi_mUGe3F7W
Thanks for the information! Really liked the video but this didnt answer a question that's being brought up at work. I fully understand that subcooled liquid refrigerant is suppose to enter your metering device but my question is: what would happen is vapor refrigerant entered the metering device? What effects would that have on a system.
The only way you would have vapor going to the txv is if the unit is low on refrigerant or there is a liquid line restriction or the king valve on the top of the receiver was partially shut. It wouldn't have anything to do with the receiver. If vapor entered the txv then there would be no pressure change on the other side and therefor not saturated phase change in the coil which would result in no heat removal at the indoor coil. Have you looked up and watched the videos i put out on the refrigeration cycle? I did one on a wlak in cooler. Just look up ":acservicetech refrigeration cycle playlist" to look through those videos, thanks
Where is the best place to measure sub cooling? Before or after the receiver?
In refrigeration after the receiver but you should have a sight glass as well and we try to drain the receiver by increasing the load to ambient if ever possible get the sight glass full of liquid and then close the door to the refrigerator unless you are following a manufacturer spec. Many times it is not possible to increase the load because of the product not being moved so we monitor superheat on the way down when lowering in temp thanks John!
Another great video thanks
Thanks Saeed!
in my area there is a lot of residential condensers used to cool a walk-in cooler. can you explain how this works for them? the condensers are oversized.
The main reason is that the condensor coils are a lot larger than a normal refrigeration outdoor unit so there is room in the coil for the added subcooled liquid. Thanks and great question!
acservicetech thank you thank you makes good sense. any kind rule of thumb for sizing? recently saw 3 ton condenser on a one ton Evap coil surprisingly working good. store owner is talking about putting a 4-ton condenser with two one ton Evap coils
The reason is just because they don't run very long and the sizing really depends on the box size and desired temp along with insulation value, thanks
i was always told when charging a walk in box fill the receiver 1/2 to 3/4 of the way while its running,in order to have enough refrigerant in system during high load situations. Have you heard about this?
Yes if you have the opportunity, create the high load to drain the receiver but still maintain enough refrigerant liquid to create the steady stream of liquid to the txv. I was speaking of a start up without product without other charging device other than a liquid sight glass. Thanks
every system should be charged to about 90 % capacity. there fore you should find the pump down capacity of your receiver. If the receiver is 10lb capacity then you should have 9 lbs of refrigerant in that system. this is for units 25 ft of line set or less.
How much does a receiver holds in percentage wise of total system charge?
70-75% when pumped down. No more.
Good video when you have and receiver and you don't know what level little trick is use a the small solder torch and move it a long side it will get cold and that where the level is where is start to frost.
Hi i have a question, i went to school for Hvacr and I've been a helper for this very small 4 man hvac company for 3 weeks and payed 10 dollars an hour full time, do you think its worth it to join an hvac union? Or just go for a bigger company? Im afraid of somebody hiring me as a non union worker and only being used for 1 season and then firing me which is what ive heard happens alot i really love this trade but feel i need guidance really love the videos by the way. Thank you.
Rob Evans Go union, you will not regret it.
I think every area is different. If I drive 1.5 hours north of my location, there are a lot of commercial companies. In my area there are not many commercial companies but many smaller companies. It really is about getting into the right company. A union may be nice as they would put you through an education apprenticeship with certain known raises but you could also do well if you found a real serious company. I started out at 10 dollars an hour 15 years ago and was up to $16 after 1.5 years. I think some employers are just thinking of times earlier on in their career unfortunately. In my opinion the lowest now would probably be closer to $13 an hour for a private company starting out but everyone has their reasons such as the age of the employee, experience level, first impression, amount of tools. It will also depend on if the company specializes in new construction only or changeouts, existing homes and service. Unions usually start out a little higher in most cases. Keep at it and learn. After 4 or 5 years in a good company, you will be very valuable, thanks and check out this video maybe too - th-cam.com/video/R7U_Kry1CBA/w-d-xo.html
Is there a way to tell the level in the receiver?
Only if you open the door to the walk in box with the highest heat load possible. Going from bubbles to a clear liquid line sight at that moment will tell you that the receiver is drained and there is only one degree of subcooling. You wont be able to tell unless you start that process without being undercharged and having bubbles though, thanks
Thank you
Thanks Salvador Dali!
There is no receiver on a cap tube system, I use to do 100s of ice boxes in stores
and the outside boxes.
I all so see many techs put big liquid filters on cap tubes, big mistake.
should use a strainer filter. ivanbennett.com/strainer.jpg
Tell us why.
Hey Ivan, your comment was in the spam because it had the link, just getting to it now. Most refrigeration systems with cap tubing are packaged and are designed by the factory to be able to maintain at least some superheat while its running across its expected temps and conditions. A larger filter drier is not used do to its volume and the possibility of liquid flashing, as well strainers are built more in a way to keep the cap tube from possibly getting clogged. A receiver is used with a txv due to the varied volume of refrigerant allowed through the txv at different operating conditions, thanks