404a walk in cooler pressures

Low temp freezer running 404a. evaporator temp should be around -20 degrees - which is 15psi for 404a. (but it wont be quite that low until the box gets closer to proper temp. normal head pressure for 100 degree ambient would be 130 degree condensing temp which is 350 psi for 404a.

404A, R-407c, R-410A, and R-22 in a vapor compression experimental set-up. The results were used to evaluate and compare the following performance criteria: cooling capacity, coefficient of performance, compressor discharge temperature, input power, refrigerant mass flow, pressure ratio, and volumetric refrigeration capacity.🚀 Elevate Your Cooling Efficiency! 🚀 Unlock savings with the right Walk-In Cooler Door Gasket from Unity Cooling Systems! 🌡️💸 A simple change could save you $6,000 annually, ...To increase or decrease the cut-out setting (while maintaining the same cut-in pressure) adjust the pressure switch with a 3/8 inch nut driver or socket as follows: a. Complete the following 6 steps. → Disconnect the power. → Remove the cover. → Visually inspect the pressure switch for leakage.... pressure was taken. Notes. Page 154. 145 Training Module: Walk-in Cooler/. Walk-in Freezer Repair & Maintenance. 404A PRESSURE-TEMPERATURE CHART. 0F. R404A. -50.recommended that this pressure be held for a minimum of 12 hours and then rechecked. For a satisfactory installation, the system must be leak tight. Recommended Low Pressure Control Settings for Outdoor Air Cooled Condensing Units *Minimum Temp. ˚F R-404A/R-407A/R-448A R-407C Cut-In PSI Cut-Out PSI Cut-In PSI Cut-Out PSI 50 90 35 70 40 40 70 ...

I have walk-in freezer that head pressure 50 psi below normal at 280# 95*amb and my Superheat at evaporator is 26*F clear sight glass.404a system. normal head should be around 330# . both coils clean. decided to adjust TXV to 6* SH at evaporator outlet. very short piping condensing above walk-in ceiling. · If this is so always evaporating above zero, 4 or 5 deg celcius, R407c will have a low pressure (suction ) of about 50 psi. and a high pressure ( discharge ) of about 280 psi, which is about 55 deg celcius, cooling cycle. Standing pressure ( system not running ) will depend on surrounding temperature of outdoor unit."Another thing say you are charging an R22 refrigeration system (large pan cooler) which requires 34 pounds of R-22. I had a heck of a time getting that much charged in. I ran warm water over the container many times to get the pressure back up to charge in the vapor." It would not take long to charge 34lbs R-22 through liquid line404a Refrigerant Temperature Pressure Chart – techtownforum.com R404a Refrigerant Pressure Chart Temperature (Fahrenheit) Pressure Temperature (Celsius) R404a - 50°F - 45.6°C 0.1 psi - 45°F - 42.8°C 2 psi - 40°F - 40°C 4.3 psi - 35°F - 37.2°C 6.8 psi - 30°F - 34.4°C 9.6 psi - 25°F - 31.7°C 12.7 psiFrozen oil. Air cooled piston type condensing unit. General Features. Compact and durable. Wide range of applications. Green refrigerant R404a is used. High efficiency and low noise external rotor fan motor is used. High efficiency coper tube aluminum fin conderser. PTC sensor is used to monitor motor temperature.Jun 29, 2020 · The newer refrigerant R-448A, also known as Solstice N40, is an HFO refrigerant. It was introduced by the Honeywell corporation under their new Solstice brand line. While 448A can technically be classified as an HFO refrigerant it actually has more HFC refrigerants in it. This refrigerant is a zeotropic blend of R-32 (26%), R-125 (26%), R-134a ...In a land far, far away. Posts. 19,029. Post Likes. Pressures similar to 502, head may be a little higher under load or in hot weather. Normal head would be 200-350 depending on outside temp and load conditions. Suction 20-45 depending on inside temp. LP-cut out around 5 psi, don't pull into a vacuum. Cut in about 30.

What should the pressures be on a R-22 commercial refrigeration unit with a start up box temperature of 74 degrees and a condenser ambient air temp. of 82 degrees. Condensing unit is 3/4 h.p. and the …Suva® 404A (HP62) All Physical Properties General physical properties of the Suva® HP refrig-erants are shown in Table 3. Pressure-enthalpy dia-grams for the Suva® HP refrigerants are shown in Figures 1-6. Additional physical property data may be found in other DuPont publications. Bulletin ART-18 contains viscosity, thermal conductivity ...R-452A XP44 Basic Info. R-452A is a newer refrigerant that falls into the Hydrofluoroolefins classification family (HFOs). It can also be found under the Opteon XP44 brand name from Chemours. It is a zeotropic blend of R-1234yf (30%), R-32 (11%), and R-125 (59%). This refrigerant was designed to be an alternative to the extremely high Global ...Freon is probably the most misused term out there right now. When you say freon, you are referring to refrigerant. There are many different types of refrigerant. There is R-12 ...A technician incorrectly installed a high temperature application 18,000 BTU 404a compressor in place of an 18,000 BTU 404a low temperature compressor on a small walk in freezer. What would be the resulting pressures as compared to using the correct compressor? 1) Reduced suction pressure with higher head pressure

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R-449A XP40 Basic Info. R-449A is a non-azeotropic blend comprised of R-134a (25.7%), R-1234yf (25.3%), R-125 (24.7%), and R-32 (24.3%). This refrigerant falls into the new classification of refrigerants known as Hydrofluoroolefin family. You may also see R-449A labeled as XP40 or under the brand name Opteon which comes from the …Walk-in freezer high head pressure. with the flip cover off and the outside roof temp near 100 deg, box is at 20 deg. I blew out all the dirt out of the condenser, and there was plenty, the high side does not sit still, it will fluctuate from 330-390, kicks off at 400, when it starts up, the high side immediately goes up for 5-10 seconds and ...🚀 Elevate Your Cooling Game with Unity! 🚀 🌡️ Navigating 404a Walk In Cooler pressures can be a slippery slope, but Unity Cooling Systems brings you a tale of triumph amidst the ice, ...Refrigerant charge, oz R-404A 11 High pressure cut out / cut in, PSIG 400 / 300 Compressor Amps, beg . - end, freeze 7 .3 - 4 .8 Compressor Amps, harvest 6 .2 Cycle Time (minutes) Water Cooled Ambient Air Temp (deg . F) Water Temp 70 80 90 50 8-10 10 10 70 10 11 10-11 80 11 11 11 90 11 11 12 Low Side Pressures 70/50 90/70 Beg End Beg EndForane 404A Pressure Temperature Chart Forane 404A, R-404A, Pressure Temperature Chart, PT Chart, HVAC, refrigeration, air conditioning, refrigerant gasWhat is the low side pressure for R-404A? When the temperature inside the freezer is at about 0°F, the low side pressure should be 8-10PSIG for R404A charged units. Refrigerators should pull down to 35°F in about 20 minutes when located in an ambient of about 75 °F. What should pressures be on a walk in cooler? The pressure will depend …

In regards to the discharge temp it was barely warm. Our pressure at the high side service valve was 140psig for 404a that's 66 degrees F. The pressure at the outlet of the …We bought components to build our own walk-in freezer. Larkin scroll compressor unit, 2.5 hp, 230V 3 phase, LZT025L6C with a Larkin Evaporator: LCE676BB, 2 fan single phase, 230V, liquid line solenoid, piping, 404A etc. to get us down to -20F at least. ... (N Open), Time delay relay (N Open) in series with CR1: the compressor contactor. With ...What should the low pressure be for a 404a refrigerant on a freezer? 18-20psig suction 250-270 psig discharge In freezers pressures are ok .I got it ,but the mention pressure of suction 18-20 ...What should the low pressure be for a 404a refrigerant on a freezer? 18-20psig suction 250-270 psig discharge In freezers pressures are ok .I got it ,but the mention pressure of suction 18-20 ...Reducing the load on the compressor & lowering your suction pressure. The side with the smaller evaporator cannot reach setpoint, so it runs full time at the reduced suction pressure & prematurely freezes the evaporator over. Reply. 09-25-2013, 09:22 PM #13. troyr.Jun 17, 2022 · The liquid line pressure needs to be higher than the outdoor ambient’s saturation temp, so it would be at least 257. What is a good superheat for 404A? A good guideline is 4-6 degrees, but best to consult with the equipment manufacturer for their recommendation. What should the superheat be on a 404A walk in cooler? Nov 17, 2006 · In a land far, far away. Posts. 19,029. Post Likes. Pressures similar to 502, head may be a little higher under load or in hot weather. Normal head would be 200-350 depending on outside temp and load conditions. Suction 20-45 depending on inside temp. LP-cut out around 5 psi, don't pull into a vacuum. Cut in about 30. Jun 5, 2014 · subcooling somewhere around 12-15 degrees F. Suction Pressure around 21-22 psia = -15 to -14 deg.f. Suction line temp. leaving evap. = -12 to -2 deg. F. (The temperature swing is -12 to -2) It stays quite stable. Isn't radical with the temp. swing. box temp. -5. It's an empty walk in box about 7 x 10 foot square.Jan 28, 2021 · From https://www.justanswer.com/ythiJustAnswer Customer: What is the normal suction pressure on a 404a walk in freezer?Pearl Wilson: Assistant: What's the ma...

Refrigeration Excellence. 4.5 (12 reviews) 1. In a dry type (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as possible in order to: A. Operate at high-efficiency. B. Ensure that Frost is not accumulate.

Im working on a 400 walkin cooler head pressure 250 and suction 45 psi R22 unit .what s my suction pressure suppose to - Answered by a verified HVAC Technician ... I have a 404A walkin freezer ambient temp is 49F what ... walk in cooler with condenser pack outdoors.r-22 with txv. at start up unit runs very good. the temps and pressures are all ...When starting up the cooler refrigeration system for the first time, the following events occur. The operating sequence is as follows: (1) Thermostat calls for refrigerant. (2) Liquid line solenoid valve opens, allowing refrigerant to flow. (3) Pressure control makes the control circuit and the condensing unit operates. 404R pressure temperature chart is quite simple to understand. This is a table that tells you precisely what the pressure of R404A is at a certain temperature. At the low end, the pressure of 404A is 0.9 psig. At the high end, the pressure of 404A is 456.8 psig. We are, of course, talking about 404A liquid pressure. 1,167 Post Likes 404A Walk-Cooler You guys will have to excuse the ignorance of basically an HVAC guy who has been thrust into the position of doing a good bit of reefer work. I have a 404 walk in cooler where the temp is hovering slighlty above 50 degrees box temp.HFC blends in “semi-flooded” operations with low-pressure receivers, contact Chemours or consult the OEM. Easy Steps to Retrofit The following provides a summary of the basic retrofit ... refrigerants, such as R-407C or R-404A. Components commonly affected are Schrader core seals, liquid level receiver gaskets, solenoid valves, ball valves ...What should the low pressure be for a 404a refrigerant on a freezer? 18-20psig suction 250-270 psig discharge In freezers pressures are ok .I got it ,but the mention pressure of suction 18-20 ...Currently working on a Bremar ice maker. Just did a compressor change and thought I weigh charged it perfectly. But it's not making good ice. I have only a suction port to read the pressures, and I'm getting 300kpa at the beginning of the 8.5 min cycle, and around 240kpa by the end. It runs for 8.5miutes then goes on defrost to drop the ice made.DOE has tentatively concluded that using R–404A as the refrigerant for the analysis of medium- and low-temperature unit coolers is representative of the unit cooler market. Therefore, as discussed in the September 2023 NOPR, DOE used R–404A as the refrigerant in its analysis of medium- and low-temperature unit coolers.Walk in freezer 404a problem Its on of the stores ill be responsible for, anyway call came in walk in freezer at 20 degs, been at that temp all day, say it was fine before today So I get there, verify its running, has a full sight glass, hook up gauges, 50/300, head pressure high, so i clean the coil, no change.

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All Gases Pressure Details Link : https://bit.ly/2BNJcJ3How To Charge R404a Refrigerant With Fully Care | R404A Gas Filling Big Unit in Urdu/Hindi Best way g...Apr 11, 2023 · Ideal Superheat Requirement. For walk-in freezers an ideal evaporator super heat range should be implemented around -30°C (-22°F)to -26°C (-14°F). Moreover; it depends also depend upon indoor humidity level as well as outdoor weather conditions. Cooler Vs. Originally Posted by wildtech. Just replaced an comp on an walk-in freezer. When I charged the unit with. r-404a the sight glass remained clear for about 1.5 hours. Then the sight glass started to bubble again. My outdoor temp was 70 degrees and my box was at 20 degrees when the sight glass was flashing.Repeat as needed until the maximum setting is reached. Correct super heat for walk in freezer always work in temperatures not simply pressures. Normal superheat for 404a walkin cooler.pdf free pdf download. Don't use an infrared thermometer for this task. After all system checks have been checked, properly adjusted, and verified, replaceThen, Cascini et al. (2016) use the results of two commercial walk-in refrigeration systems to emphasize that the operating conditions and the refrigerant leakage are the most critical parameters ...What should my pressures be on a walk in freezer? Freezers should pull down to 0°F in about 1hr when located in an ambient of about 75 °F. When the temperature inside the freezer is at about 0°F, the low side pressure should be 8-10PSIG for R404A charged units. What should the suction pressure be on a 404a walk in freezer?R-407C is a zeotropic blend of R-32 (Difluromethane), R-125, and R-134a (Tetrafluoroethane). It is not a drop in replacement on R-22 machines. If you wish to use this product you will need to vacate all of the old R-22 out of the system. This is due to the R-22 systems using mineral oil and this HFC blend using POE oil.Walk-in cooler is warm because of a leak in the system, I find and replace the defective pressure switch and install a new refrigerant filter drier. Because ...Jan 24, 2017 · 132. Post Likes. also keep in mind that with a/c you are dealing with pretty much set conditions, outside 70- 100F , inside 70- 80F. in ref. outside -15--to 100 F, inside -20to 50 f ( typical for my neck of the woods). you really cant just say low temp xxx psi low temp xxx psi. we have to use the pt chart. Reply. ….

The main reasons your compressor will have simultaneously low head pressure and high suction pressure is due to: Bad or leaky compressor valves. Worn compressor piston rings. Leaky oil separator return line. Your compressor valves may become inefficient due to poor sealing from dirt and debris deposits.R-404A and R-290 EER Comparison 3 R-290 Yields 20%+ Better EER Efficiency Over R -404A. Results from Emerson’s test labs, comparing the Energy Efficiency Ratio (EER) of R -404A to R-290 in medium and low back pressure (MBP), show a significant improvement when using R -290.Oct 11, 2009 · "Another thing say you are charging an R22 refrigeration system (large pan cooler) which requires 34 pounds of R-22. I had a heck of a time getting that much charged in. I ran warm water over the container many times to get the pressure back up to charge in the vapor." It would not take long to charge 34lbs R-22 through liquid line Oct 11, 2009 · "Another thing say you are charging an R22 refrigeration system (large pan cooler) which requires 34 pounds of R-22. I had a heck of a time getting that much charged in. I ran warm water over the container many times to get the pressure back up to charge in the vapor." It would not take long to charge 34lbs R-22 through liquid line What is the normal pressures for a 404a walk in cooler? Updated: 12/3/2022. Wiki User. ∙ 9y ago. Add an answer. Want this question answered? Be notified when an answer is posted. 📣 Request ...Not sure if this unit is over charged, what do you think ?🚀 Elevate Your Cooling Game with Unity! 🚀 🌡️ Navigating 404a Walk In Cooler pressures can be a slippery slope, but Unity Cooling Systems brings you a tale of triumph amidst the ice, ...Low temp freezer running 404a. evaporator temp should be around -20 degrees - which is 15psi for 404a. (but it wont be quite that low until the box gets closer to proper temp. normal head pressure for 100 degree ambient would be 130 degree condensing temp which is 350 psi for 404a. 404a walk in cooler pressures, Feb 16, 2014 · 1. a) Most walk-in coolers and freezers use a TX valve to regulate the flow of refrigerant into the evaporator. If the superheat is low the TX valve will allow refrigerant to flow into the evaporator at a rate that exceeds the capacity of the evaporator and as a result liquid will enter the suction line., SUBJECT: TEMPERATURE - PRESSURE CHART FOR FYI #289 9/17/2009 R-22, R-410A, R-407C, R-134A & R-404A REFRIGERANTS ADVANTAGE Engineering, Inc.525 East Stop 18 Road Greenwood, IN 46142 317-887-0729 fax: 317-881-1277 web site: www.AdvantageEngineering.com email: [email protected], Filmed: 1st December 2022Weather: Cloudy 3 C \ 37.4 F_____I use affiliate links, which means that if you ..., Dec 11, 2010 · 488. Post Likes. Set the control up to open at the pressure equivalent to 90ºF condensing temperature and close at 40 psi above that. For R404A that would be CO at 205 psig (90ºF) and CI at 245 psi. The 20 degree superheat 6 inches from the compressor is a minimum so that overides evap superheat on a short run., A single compressor, large commercial walk-in freezer D. A domestic refrigerator ... B. low-pressure appliances. C. high-pressure appliances. ... A. R-290 B. R-450A C. R-600a D. R-404A. A B. R-450A. 10 Q Which of the following refrigerants is very high pressure and generally does NOT need to be recovered? A. R-22 B. R-134a C. R-404A D. R-744, Unit Cooler Piping. When brazing refrigerant lines, an inert gas should be passed through the line at low pressure to prevent scaling and oxidation inside the tubing. Dry nitrogen is preferred. Use only a suitable silver solder alloy on suction and liquid lines. All piping must be adequately supported to prevent vibration and breaking., HOME PAGE. ©Copyright 2002-2023 Powell Patrick, HVACRinfo.com. HOME PAGE, Jun 10, 2019 · Compare the amp reading of the compressor to the manufacturer’s amp curves for the pressures recorded. Make sure the amp draw is within range (±5 percent) on the curves for the two pressures and voltage recorded. After applying these basic rules, a TXV/receiver/sight glass refrigeration system can be charged to the proper amount of refrigerant. , Pressure chart for all temperatures of the R-404A refrigerant. Diagnose problems for your R-404A appliance with our complete Pressure Table., Temperature (F) R-22 R-410A R-12 R-134a R-404A R-507A R-407A R-407C R-427A R-422B R-422D R-407F R-448A R-421A R-513A R-449A R-452A-48: 4.8: 6: 18: 1.6: 1.3: 1.7: 7.7: 9.8: 10.2,  · what would you consider a "too high" pressure for a medium temp unit using 404a? the pressures im working with are 65psig and 325psig with an ambient temp of 70f. the liquid line is hot (around 115f), the superheat is a tad under 30 but the unit is still coming down to temp. i built this cooler (a small, glass door wine cooler) from scratch and it has …, Nov 8, 2014 · I am working on a walk in freezer that had a bad txv. I have recovered all the ref. and installed the new txv but realized that the data plate doesn't have how much ref. the unit requires. I have very little experience working on freezers and was wondering if I could charge off super heat and subcool like a normal ac unit or if those readings would be …, Welcome! We keep going until you have all of the information you need.[b/]. Extensive training & coaching also available. You use a refrigerant pressure temperature chart, or the temperature equivalent scale on your gage set, then set the cut in pressure/temperature pressure 2 degrees above freezing (32deg F)... then you wait until the box cools to the temperature you want, say 35 deg F, and ..., about 105% of the R-404A charge.) 6. Restart the system and allow it to come to normal operating conditions. Refer to the pre-retrofit data sheet to confirm operating parameters. Adjust TXVs and pressure controls as necessary. 7. Document the retrofit with a label on the system indicating R-449A refrigerant and the POE used. Servicing ..., Mar 29, 2017 · This is the fourth in our series of articles on walk-in coolers and freezers. As seen in the previous articles in this series, each component of a walk-in cooler or freezer plays a vital role in ensuring optimal performance. In this article, we will examine how regulating small aspects of a walk-in’s refrigeration system, like fan speed, can have a …, Jun 9, 2016 · the R-404A/R-407A refrigerant still in the system. All leaks should be repaired before the R-448A/R-449A refrigerant is added. 3. It is advisable that the system operating conditions be recorded with the R-404A/R-407A still in the system. This will provide the base data for comparison when the system is put back into operation with the R-448A/R ..., Jul 14, 2023 · -8% Cooling capacity should be ok +2% Power-10% COP 7. Compressor MTZ/NTZ/MLZ/LLZ and Optyma™ condensing units +16% Check dimensioning 3. Evaporator (Te = -30°C) +33% Check if the valve is oversized 2. Solenoid valve EVRv2 1. Expansion valve T2/TU Valve is probably oversized, risk of malfunction; check and …, Forane 134a Pressure Temperature Chart Author: Arkema Inc. Subject: Forane 134a Pressure Temperature Chart Keywords: Forane 134a, R-134a, Pressure Temperature Chart, PT Chart, HVAC, refrigeration, air conditioning, refrigerant gas Created Date: 10/4/2012 11:23:04 AM, Feb 12, 2020 · R-404A HFC 97.6-51.8 548.2 162.5 35.84 66.37 0.342 86.1 0.3600 0.2077 0 3920 A1 1.5 Refrigerant Reference Guide 33 5th Edition 2010 R-404A Technical Guidelines Applications: Medium and low temperature commercial and industrial direct expansion refrigeration and ice machines Perormancf e: • Similar PT and flow properties to R-502, A −10°F walk-in freezer using R404A has a suction pressure of 15 psig. The suction line temperature at the TEV bulb is −20°F. What is the evaporator superheat ..., April 10, 2020. Low-pressure controls are a common accessory added to many refrigeration systems. They are normally used to electrically cycle a compressor on and off; however, when and why they do so will vary based on the design of the system. When working on a system, it is important to determine how the low-pressure control is being used ..., Listed below are field service terms or trade jargon often used to describe these pressures. Condensing pressure: High-side pressure, head pressure, discharge pressure. Evaporating pressure: Low-side pressure, suction pressure, back pressure. Figure 1. A basic refrigeration system showing refrigerant pressures, states, and conditions., R-404A _____ SDS: R-404A Page 3 of 8 Current Issue Date: April 2018 UNUSUAL FIRE AND EXPLOSION HAZARDS: R-404A is not flammable at ambient temperatures and atmospheric pressure. However, this material will become combustible when mixed with air under pressure and exposed to strong ignition sources., 404a pressures in low. I have a r-404a roof-top condensing serving a walk in freezer. pressures are 235 psi head pressure and a 28psi suction pressure. Outdoor ambient is 30degress and indoor box temperature is about 20degrees. System has a head pressure control on roof for hot gas. Wondering if pressures sound right., Jun 24, 2011 · Low temp freezer running 404a. evaporator temp should be around -20 degrees - which is 15psi for 404a. (but it wont be quite that low until the box gets closer to proper temp. normal head pressure for 100 degree ambient would be 130 degree condensing temp which is 350 psi for 404a. , direct expansion refrigeration and ice machines Perormancf e: • Similar PT and flow properties to R-502 • Higher capacity than R-22, therefore requires TXV change Lubricant Recommendation: Compatible with polyolester lubricant Retrofitting: Replacement for R-502 page 99 Replacement for R-22 page 96 Temp (˚F) R-404A psig R-404A 24 LB ..., Re: R-404a running pressures. it depands on the evaporation temperature... if evaporation temperature is -40 C then suction pressure is around 1 - 3 psig and condensing pressure around 200 psig. if evaporation temperature is -25 c then sp might be approx. 10-12 psig and condensing presssure might be up to 220-240 psig., Feb 3, 2014 · When the temperature inside the freezer is at about 0°F, the low side pressure should be 8-10PSIG for R404A charged units. Refrigerators should pull down to 35°F in about 20 minutes when located in an ambient of about 75 °F. This is an older thread, you may not receive a response, and could be reviving an old thread. , I've been working on some walk in freezers and coolers with a new maint. job I took 1 1/2 years ago. I do ok but I need some advice on checking sub-cooling on this walk in freezer, r404a 3h.p. semi-hermetic, shell and tube heat exchanger in the box a couple of feet before the piping enters evap. cabinet. ... . 2-3* sub-cooling,sight glass not ..., It makes and breaks power to the condenser fan motor to maintain a certain pressure. Here is an example setting for R22 gas: Fan cycle setting 260# of pressure turns fan on. 230# of pressure turns fan off. By keeping the head pressure above 200# the fan cycle control avoids a warm refrigeration unit during cold weather., If you are looking for a reliable and efficient condensing unit or packaged system for your refrigeration needs, you may want to check out the H-IM-CU installation and operation manual from Heatcraft Refrigeration Products. This manual covers the features, specifications, installation, operation, maintenance, and troubleshooting of various models of air-cooled and water-cooled condensing units ..., This works when the R12 charge specification is listed in pounds. Take the R12 charge specification and multiply it by 0.9. Then, subtract that result by 0.25 pounds to get the proper amount of R134a charge. Formula: (R12 Charge Specification x 0.9) – 0.25 lbs. = R134a Charge Level. As an example, let's say the R12 charge specification is ..., R-449A XP40 Basic Info. R-449A is a non-azeotropic blend comprised of R-134a (25.7%), R-1234yf (25.3%), R-125 (24.7%), and R-32 (24.3%). This refrigerant falls into the new classification of refrigerants known as Hydrofluoroolefin family. You may also see R-449A labeled as XP40 or under the brand name Opteon which comes from the …