For anyone interested, there's a few reasons why moisture is so bad for any refrigeration system, but these in particular are more sensitive because of the low temperatures. In your standard airconditioner, the main concern with moisture is acid formation. The oil most commonly used in most modern air conditioners is the synthetic Polyolester oil (POE), which chemically is a dehydrated acid. Introduce water to the system and it will rehydrate and become acidic, eating away at the inside of the copper lines to cause leaks and plate the inside of the compressor with copper which in turn causes electrical burnouts. In sensitive systems such as this one, there's the additional concern of the moisture freezing inside the metering device due to the low temperature, which results in either a partial or full blockage of the metering device. This can partially or completely inhibit the systems ability to cool, and will likely result in compressor failure as the compressor relies on the cold refrigerant gas in the suction side to remove heat from the crank case.
Very good video. I had no clue the low stage gets evacuated for 4 days on an ultra low freezer and it gets a decay test for a half hour. Very interesting info. Thanks
ood morning, my name is Paulo Ziemer and we would like to have a checklist for preventive or corrective procedures in ultrafreezers. We thank you in advance for your goodwill.
Good evening, I would like to know how I could obtain all the information about corrective and preventive maintenance because here in Rio de Janeiro there are almost no specialists in this area and I would really like to put your tips on ultrafreezer maintenance into practice. My name is Paulo Ziemer. thanks
Thank you for nice video, could you explain in more details with separate system. Question below 250 microns the additive in the oil will pull in to vacuum that’s in residential systems so why do that? Thank you.
السلام عليكم عند مشكلة في مجمدة bioase frizer _86 كان فيها ثقب في المكثف تم اصلاحه ثم قمنا بي تفريغ الهواء وتعبئة الغاز حسب الموجود في المحرك R404a ثم بدئة في العمل لكن درجة البرود تصل الى _30 لا تصعد الى _80 دجة لماذا
Great video! Do you know how can I install an external independent temperature probe in a Sanyo MDF-U52VA? Service manual and manufacturer states it can be installed via the "multiple access ports" but cannot find anything more specific before touching the equipment. Thanks.
Hi karlosflyer, Glad you enjoyed the video! We don't work with external temperature probes very often; the focus of our ULT work is on the mechanics of the freezer itself. Additionally, we haven't yet had any Sanyo freezers through, so we aren't very familiar with them. We recommend that you reach out to Sanyo's customer support team for further assistance.
Thanks for these amazing videos. You are one of a kind on yt right now. I had two questions i hope you can answer. Do you mean you hook up a vaccum pump to the system and let it run for 4 days straight or you let the unit stay in low vaccum state for 4 days? At 5:30 there is a valve with handle on the right side. Do you install these up to the system permanently or just hook them to the core shredders for reading pressures momentarely?
Hello! We run the vacuum pump for up to 4 days if needed. The system needs to be able to hold a vacuum of 200 microns, or less, for 30 minutes to pass the test. Regarding the 5:30 timestamp question, these are temporary valves that we use while servicing the equipment.
Do you guys buy surplus ult freezers ? For example I’ve purchased one from a university in Tampa to tinker with … finally got 220v to it but I can’t get the compressors to crank on .. Would love to get rid of it …
Hy sir how are u I am form Pakistan I have biobase single compressor embraco 220v use in system..how I can find which refrigerat use in compressor..it's temp -86 centi grade ..
If you have a single compressor -86 freezer (like mine two Arctiko units) - than those are a SINGLE compression stage AUTOCASCADE units. Fill those with something like EP88 or with mix of ethane, propane, isobuthane, buthane In case of 315gram of EP88 charge - it consist of 5 moles of gas mix Try putting in 1 mole of R600a, 2moles of R290 and 2moles of R170 and see how it performs. (Watch amp draws, dischage temps and pressures). Make sure the oil return works well Also be aware, that those Chinese units are rated to +20 degrees room temp MAX!!! - so direct a cold stream of air from aircon onto their condensers, and set aircon to +16 degrees, to prolong their life.
Hi Ram, The first, or high, stage uses R404A in its compressor. The second, or low, stage uses 508B and a small amount of 99.9% pure propane. Hope this helps!
@@mk48232 Hi Noor, The propane helps the oil mix with the refrigerant, which in turn allows the oil to travel through the system without becoming more viscous and accumulating in tubes or other components. Hope this helps!
Dear Ram, (assuming you can legally go the hydrocarbon route): In case if you can't get hold of manufacturer recommended ones in your part of the world - than for low stage just use R170 (Ethane), charge to something like 8 - 12 bars at room temp, can also add 0.5 bars of R290 first. Watch temps/pressures and amp draw of each compressor during pulldown. Low evap should be at 1 - 2 bars abs pressure. If not enough amp draw - than add some more charge, untill operational conditions are reached. And for high stage just use R290, sometimes mixed with a bit of R600a. In case the high stage compressor fails - one can repurporse an outdoor condenser unit from a good R410A 12K btu+ aircon/heatpump (esp one, that can work down to -25C evap temp), than run the copper lines to the internal unit/heat exchanger. Refill with R410A or R290. And make sure there are NO LEAKS.
How can i get my freezer to freezer to freeze large ice blocks 2ft wide 4ft length 2 1/2 hight how long would it take to freeze that size of ice blocks the freezer is 105 in length how can i boost and speed up making ice blocks
In this case you want high capacity medium temp system (not an cascade ultralow one) It should be cooling bath of brine down to -10 - -15 C for efficient heat transfer to containers with frozen water Use some sort of supermarket refridgeration system as staring point (or modified air-water heatpump in cooling mode, cooling brine down to -15)
I started laughing when he said he was down at a low vacuum and you see 87 micron I'm like dude if I'm not pulling at least 50 micron on a compressor replacement of any unit residential or commercial then I don't have a good vacuum and I've used triple evacuations and super evac pumps on huge units 200 ton units and yes it does take days but honestly if he had changed his hose setup he should not be using those hoses it should be using Teflon in place of the rubber quarter presser seals or it should be using the blue vac with a half inch and then a shredder remover with a tap for nitrogen to be brought right back in that would be the correct way
Hi Zass, No, you generally cannot use the same refrigerant in both stages. We recommend reaching out to the manufacturer of your freezer to find out which refrigerants they recommend you use in each stage.
Hi Correy, Normal pressure is dependent on the temperature of the refrigerant, how long the freezer has been running, and the specific model of the freezer. That said, most ULT freezers shouldn't exceed 200psi or drop below 80psi at any given time. Hope this helps!
Hi! Depending on the amount of moisture in the system. The system needs to be able to hold a vacuum of 200 microns, or less, for 30 minutes to pass the test.
Hi Faiz, The warm alarm is triggered if the interior of the freezer gets too warm (typically at least 5°C warmer than the setpoint). This can happen during normal cycling, or it could be a sign of a weak component, contaminated refrigerant, or other symptoms. The RTD sensor is typically located in the bottom right-hand corner of the interior. Oftentimes it's in a little metal cage attached to the wall. Hope this helps!
@@newlifescientificinc.789 Thank you so much for your help, I got it 👍 Also, is it possible for us to disable the alarm from the freezer settings until we replace our RTD sensor? We already mute it every 15 minutes. It’s making too much noise in our lab and we would like to disable it for the time being. Let me know if it’s possible or not. It will be highly appreciated.
@@faizsaiyed9255 Glad we could help, Faiz. Regarding your alarm problem: all the Thermo ULT freezers we've seen had a "Power On" position that you could turn the key to, rather than leaving it on the "Alarm On" option. This will silence all alarms, but still allow you to see their visual indicators.
New Life Scientific Inc. May I please know where is this “power on” position? I’ve read the User Manual and still couldn’t find any mention about such key or position. Is it accessible through the screen or in the back of the freezer? Thanks for the solution.
@@faizsaiyed9255 Hi Faiz, Could you share your freezer's manufacturer and model? We could assist you further with this information. It's possible that your particular freezer doesn't have the alarm muting capability that Thermo freezers have.
For anyone interested, there's a few reasons why moisture is so bad for any refrigeration system, but these in particular are more sensitive because of the low temperatures.
In your standard airconditioner, the main concern with moisture is acid formation. The oil most commonly used in most modern air conditioners is the synthetic Polyolester oil (POE), which chemically is a dehydrated acid. Introduce water to the system and it will rehydrate and become acidic, eating away at the inside of the copper lines to cause leaks and plate the inside of the compressor with copper which in turn causes electrical burnouts.
In sensitive systems such as this one, there's the additional concern of the moisture freezing inside the metering device due to the low temperature, which results in either a partial or full blockage of the metering device. This can partially or completely inhibit the systems ability to cool, and will likely result in compressor failure as the compressor relies on the cold refrigerant gas in the suction side to remove heat from the crank case.
Very good video. I had no clue the low stage gets evacuated for 4 days on an ultra low freezer and it gets a decay test for a half hour. Very interesting info. Thanks
We're glad it was informative to you, Jim!
Good informative video. Hard to find videos on ULTs.
Thanks for the video, definitely will be services some thermo fishers in the near future
Finally someone!
ood morning, my name is Paulo Ziemer and we would like to have a checklist for preventive or corrective procedures in ultrafreezers. We thank you in advance for your goodwill.
Hi, this video is very helpful. I hope someday i can get experience with this type of machine..
Good evening, I would like to know how I could obtain all the information about corrective and preventive maintenance because here in Rio de Janeiro there are almost no specialists in this area and I would really like to put your tips on ultrafreezer maintenance into practice. My name is Paulo Ziemer. thanks
is there a reputable ultralow refer school?
Thank you for nice video, could you explain in more details with separate system. Question below 250 microns the additive in the oil will pull in to vacuum that’s in residential systems so why do that? Thank you.
Great vídeo.. i'd like to learn about this equipament.
I work With refrigeration in Brazil
Very useful video thanks 🙂
How many hours need vacum for ult compressor
السلام عليكم عند مشكلة في مجمدة bioase frizer _86 كان فيها ثقب في المكثف تم اصلاحه ثم قمنا بي تفريغ الهواء وتعبئة الغاز حسب الموجود في المحرك R404a ثم بدئة في العمل لكن درجة البرود تصل الى _30 لا تصعد الى _80 دجة لماذا
Buenas tardes amigo, ¿Quisiera los vídeos en español, sí se podría?
hi mate, first and formost thankyou for the informative video. Where can we buy the second low pressure propane compressors from?
nice
Great video! Do you know how can I install an external independent temperature probe in a Sanyo MDF-U52VA? Service manual and manufacturer states it can be installed via the "multiple access ports" but cannot find anything more specific before touching the equipment. Thanks.
Hi karlosflyer,
Glad you enjoyed the video!
We don't work with external temperature probes very often; the focus of our ULT work is on the mechanics of the freezer itself. Additionally, we haven't yet had any Sanyo freezers through, so we aren't very familiar with them.
We recommend that you reach out to Sanyo's customer support team for further assistance.
Sanyo freezers usually have a probe hole in the back of the freezer.they typically have a rubber plug on the outside
Thanks for these amazing videos. You are one of a kind on yt right now.
I had two questions i hope you can answer.
Do you mean you hook up a vaccum pump to the system and let it run for 4 days straight or you let the unit stay in low vaccum state for 4 days?
At 5:30 there is a valve with handle on the right side. Do you install these up to the system permanently or just hook them to the core shredders for reading pressures momentarely?
Hello! We run the vacuum pump for up to 4 days if needed. The system needs to be able to hold a vacuum of 200 microns, or less, for 30 minutes to pass the test.
Regarding the 5:30 timestamp question, these are temporary valves that we use while servicing the equipment.
Do you guys buy surplus ult freezers ?
For example I’ve purchased one from a university in Tampa to tinker with … finally got 220v to it but I can’t get the compressors to crank on ..
Would love to get rid of it …
I have worked at low temperature but not below 40-40. How can it be lowered? Please help me a little. Please help me.
Hello.. im fixing one equipament. Haier, do you know? I found a coolant leak point in the succion tube. Can you help me. I need to put gas.
boa noite, my name is Paulo Cezar Ziemer, Rio de Janeiro end i`d like understand how fucion ultrafreezer. Can you sand videos about this.
thanj you
It would be nice if you could help me a little bit
Brother, these works can be done in our Bangladesh
Can you help me build a bridge Sealdah Temperature at Refrigerator?
What is the suction pressure in 2nd stage freon R508a , R290 mixed
I need - 80 degrees I need how to get it down Please help me - I need 80 degrees temperature
Hy sir how are u I am form Pakistan I have biobase single compressor embraco 220v use in system..how I can find which refrigerat use in compressor..it's temp -86 centi grade ..
If you have a single compressor -86 freezer (like mine two Arctiko units) - than those are a SINGLE compression stage AUTOCASCADE units.
Fill those with something like EP88 or with mix of ethane, propane, isobuthane, buthane
In case of 315gram of EP88 charge - it consist of 5 moles of gas mix
Try putting in 1 mole of R600a, 2moles of R290 and 2moles of R170 and see how it performs. (Watch amp draws, dischage temps and pressures).
Make sure the oil return works well
Also be aware, that those Chinese units are rated to +20 degrees room temp MAX!!! - so direct a cold stream of air from aircon onto their condensers, and set aircon to +16 degrees, to prolong their life.
which RPM fan motor used in freezer
Sir which compressor and gases use for -86 ultra low deep freeze in 1st and 2nd stage
Hi Ram,
The first, or high, stage uses R404A in its compressor. The second, or low, stage uses 508B and a small amount of 99.9% pure propane. Hope this helps!
@@newlifescientificinc.789 Is there really need of propane?
@@mk48232 Hi Noor,
The propane helps the oil mix with the refrigerant, which in turn allows the oil to travel through the system without becoming more viscous and accumulating in tubes or other components.
Hope this helps!
Dear Ram, (assuming you can legally go the hydrocarbon route):
In case if you can't get hold of manufacturer recommended ones in your part of the world - than for low stage just use R170 (Ethane), charge to something like 8 - 12 bars at room temp, can also add 0.5 bars of R290 first. Watch temps/pressures and amp draw of each compressor during pulldown. Low evap should be at 1 - 2 bars abs pressure. If not enough amp draw - than add some more charge, untill operational conditions are reached.
And for high stage just use R290, sometimes mixed with a bit of R600a.
In case the high stage compressor fails - one can repurporse an outdoor condenser unit from a good R410A 12K btu+ aircon/heatpump (esp one, that can work down to -25C evap temp), than run the copper lines to the internal unit/heat exchanger. Refill with R410A or R290. And make sure there are NO LEAKS.
How can i get my freezer to freezer to freeze large ice blocks 2ft wide 4ft length 2 1/2 hight how long would it take to freeze that size of ice blocks the freezer is 105 in length how can i boost and speed up making ice blocks
In this case you want high capacity medium temp system (not an cascade ultralow one)
It should be cooling bath of brine down to -10 - -15 C for efficient heat transfer to containers with frozen water
Use some sort of supermarket refridgeration system as staring point (or modified air-water heatpump in cooling mode, cooling brine down to -15)
I need a condenser fan
For Thermo
If we want to use -60 in the vessel then we have to supply -85 surround the vessel. Is it okay? How it it calculate?
Hi! We're not sure what you are asking. Can you give us more details?
It don't think it is but it do
I started laughing when he said he was down at a low vacuum and you see 87 micron I'm like dude if I'm not pulling at least 50 micron on a compressor replacement of any unit residential or commercial then I don't have a good vacuum and I've used triple evacuations and super evac pumps on huge units 200 ton units and yes it does take days but honestly if he had changed his hose setup he should not be using those hoses it should be using Teflon in place of the rubber quarter presser seals or it should be using the blue vac with a half inch and then a shredder remover with a tap for nitrogen to be brought right back in that would be the correct way
Hi sir may I know can use same gas for 1 and 2 stage
Hi Zass,
No, you generally cannot use the same refrigerant in both stages. We recommend reaching out to the manufacturer of your freezer to find out which refrigerants they recommend you use in each stage.
What should normal running pressures be?
Hi Correy,
Normal pressure is dependent on the temperature of the refrigerant, how long the freezer has been running, and the specific model of the freezer. That said, most ULT freezers shouldn't exceed 200psi or drop below 80psi at any given time.
Hope this helps!
Dear friends. May you sell parts for the ULT freezers to Mexico?
Hi Jochue,
While we do sell components from some instruments, we don't currently sell parts for ULT freezers.
we do sell parts of ULT freezers.
How long time take vacuum process(90micron)
Hi! Depending on the amount of moisture in the system. The system needs to be able to hold a vacuum of 200 microns, or less, for 30 minutes to pass the test.
Sir because of a interdiction of buying r508 in our country can I remplace it with R507 ??
Hi! No, we would not recommend it.
I would go for R170 - Ethane - has similar properties to R13 / R507.
What kind of a vacuum machine You using
Thank you for sharing
Hi Abdul,
We use a standard dual-stage vacuum pump when evacuating refrigeration lines in ULT freezers.
What is the solution for warm alarm In thermo fisher -86.
Where RTD sensor is located in freezer?
Hi Faiz,
The warm alarm is triggered if the interior of the freezer gets too warm (typically at least 5°C warmer than the setpoint). This can happen during normal cycling, or it could be a sign of a weak component, contaminated refrigerant, or other symptoms.
The RTD sensor is typically located in the bottom right-hand corner of the interior. Oftentimes it's in a little metal cage attached to the wall.
Hope this helps!
@@newlifescientificinc.789
Thank you so much for your help, I got it 👍
Also, is it possible for us to disable the alarm from the freezer settings until we replace our RTD sensor? We already mute it every 15 minutes.
It’s making too much noise in our lab and we would like to disable it for the time being. Let me know if it’s possible or not. It will be highly appreciated.
@@faizsaiyed9255 Glad we could help, Faiz.
Regarding your alarm problem: all the Thermo ULT freezers we've seen had a "Power On" position that you could turn the key to, rather than leaving it on the "Alarm On" option. This will silence all alarms, but still allow you to see their visual indicators.
New Life Scientific Inc.
May I please know where is this “power on” position? I’ve read the User Manual and still couldn’t find any mention about such key or position. Is it accessible through the screen or in the back of the freezer? Thanks for the solution.
@@faizsaiyed9255 Hi Faiz,
Could you share your freezer's manufacturer and model? We could assist you further with this information.
It's possible that your particular freezer doesn't have the alarm muting capability that Thermo freezers have.
I am indian plz hindi
Like i said 😂