404a walk in cooler pressures

This 842082 compressor replaces the damaged component on your existing model. Serving as the integral workhorse of your refrigeration unit, this 3/4 hp compressor quickly and easily installs into your refrigerator so you can keep your food items cold at all times. This item includes an overload, relay, and start capacitor and runs on R-404A ...

Jul 20, 2016 · to keep unit cooler coil clear of heavy frost accumulation. typical settng; (2) defrost periods per day at (12) hour intervals. set inner dial fail safe time at maximum of 15 minutes. - defrost termination pressure control; 200 p.s.i.g. cut-in; 175 p.s.i.g. cut-out; senses evaporator pressure during the defrostNot sure if this unit is over charged, what do you think ?HOME PAGE. ©Copyright 2002-2023 Powell Patrick, HVACRinfo.com. HOME PAGE"A refrigeration system can have a head pressure control-mixing valve used with an oversized receiver (Figure 2). Most manufacturers publish charts and tables on system charge recommendations; this shows the service tech how much refrigerant to add to a system that has a head pressure control valve designed to flood the condenser in colder weather.🚀 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, ...refrigeration equipment. Freon™ 410A is intended for use in new air conditioning applications that have traditionally been serviced by HCFC-22. Many other applications are also possible, such as medium- and low-temperature refrigeration. Due to the significantly higher pressures that Freon™ 410A exhibitsThis was a service call on a walk in cooler that was at 60 degrees, the system had a bad low pressure control, I replaced the control and the system was back...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.

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. Thermostat satisfy, LLSV ( liquid line solinoid valve ) deenergizes and closes, system pumps down then shuts off on Low Pressure control. Somewhere in there, unit defrosts ( condensing unit and evaporator fan (s) off, embedded electric heater type defrost ) using a timer set at different times of day for a period of minutes.Pressure Temp (°C) Temp (°F) Pressure Temp (°C) Temp (°F) Pressure Temp (°C) Created Date: 12/31/2018 2:21:34 PM ...More efficient, quicker. Warms from the inside out. What is an effective way to check a DTFD control? Freeze the control in another freezer then measure the continuity of the contacts with an ohmmeter. **** Wirz's Commercial Refrigeration for Air Conditioning Technicians. Chapter two Learn with flashcards, games, and more — for free.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 ...I have a 2door freezer that i replaced the compressor on its a 404a system after i vaccumed the system and charged it the temp went down to 14degrees then started rising my name is oscar. Contractor's Assistant: I'll do all I can to help. Tell me a bit more about what's going on so we can help you best. iam thinking the cap tube might be pluged up404A Walk In Freezer Pressures . Having a properly functioning walk-in freezer is essential for businesses dealing with food. If your walk-in freezer isnt running right, customers can be subjected to spoiled food, high electricity costs, and other issues. One of the most important things to understand when it comes to walk-in freezers is the ...I'm starting up some new 404a equipment for a walk-in cooler. The ambient temperature inside the walk-in is 90 degrees, the condenser is on the roof and the ambient is 111 What pressures should I see ... Second opinion] - whats normal pressure for r22 walk in cooler ...

Many service technicians often become confused when the liquid line becomes restricted in the refrigeration system. This is because the symptoms often look like an undercharge of refrigerant. This article covers a refrigeration system with a restricted liquid line after the receiver using R-134a as the refrigerant. The refrigeration system is a low temperature freezer with a receiver and a TXV.Oct 13, 2020 · eration system increased approximately 5 to 20 psi (0.35 1.38 bar) with R-404A compared to R-502. These higher system pressures can require a proportional increase in the pressure control settings. R-404A is a multi-component refrigerant containing R-125, R·143a and R-134a. Because of concern about the tendency for shifting in the …2. Then take the suction pressure and convert it to temperature on a temperature/pressure chart. Subtract the two numbers to get superheat. For example, 68 psi suction pressure on a R-22 system converts to 40°F. Let's say the suction line temperature is 50°F. Subtracting the two numbers gives us 10°F of superheat.Using a low pressure control as a temperature control. A quick review of some basics, the wiring, and a demonstration on our refrigeration trainer.Table of C...Pressure Control Settings Low Pressure switch setting for an R-12 general-purpose walk-in cooler without pump down (temperature controlled by a pressure switch.) Assume a 40-degree fixture temperature and a 20-degree TD between the fixture and the evaporative temperature. • Box Temperature = 40ºF (Fixture Temperature) 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 ...

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Jul 19, 2021 · 10. Compressor suction and discharge pressures for R407A, R407F, R448A and R449A differ from R404A/R507. It may be necessary to reset the pressure cut-outs to suit the different pressures of the replacement refrigerant. This procedure should be done carefully to avoid exceeding the recommended operating limits of the compressor.The first step is to conduct regular inspections of your walk-in freezer. You should check the gaskets for cracks and rips and inspect the door hinges and door closures to make sure they’re working properly. You should also look for signs of water and ice within the insulation panels. To make sure the pressure relief port is still working ...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. Icing doesn’t only cause physical damage; it can also greatly increase the operating costs of running your walk-in freezer. When the interior components of your walk-in have to compete with excess humidity and warm air they have to work harder to maintain temperature levels. This causes them to use more energy, driving your utility bill up.Typically, the refrigeration system is sized for pressure losses equivalent to </= 2°F change to the relevant refrigerant temperature for each segment of the discharge, suction, and liquid ... - R-404A and R-507A Low Temp: Liquid Line, Condenser Line and Remote Header Line Sizing - R-404A and R-507A Med Temp: Suction

Other refrigerant options that meet the requirements of industrial refrigeration systems include: Freon™ 134a (R-134a) Freon™ 23 (R-23) Freon™ 404A (R-404A) Freon™ 407A (R-407A) Freon™ 507 (R-507) Long-Term Use Considerations. Regulations on the long-term use of refrigerants vary by region and application, and may change over time.to R-404A with lower capacity at low and medium temperature refrigeration conditions. Physical Properties General physical properties for Freon™ 407C and Freon™ 407A are shown in Table 3. The pressure-enthalpy diagrams for Freon™ 407C are shown in Figures 1 and 2. Additional physical property data may be found in other Chemours publications.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 ...To help you get the right size refrigeration unit, Heatcraft Worldwide Refrigeration has put together a Quick BTUH Load Calculation Chart. It can be used for walk-ins rooms from 6' X 6' X 8' to 40' X 40' X 8' and with holding temperatures of -20°F, -10°, 0°, 30° and 35°. Loads are calculated based on boxes utilizing 4" of ...Liquid refrigerant charging procedure for an air conditioner, window a.c (HVAC system) Evacuate the system by pumping down the refrigerant into a recovery bottle using a vacuum pump. Connect the liquid and gas line hose 2 and 3 and purge them. Connect the charging hose to the red connection of the charging cylinder for a liquid charge, and if ...The probable causes that I ruled out was the ice thickness probe bring set to far back and water flow/pressure issues. The machine only holds 2 lbs of refrigerant. When the unit is in the ice making mode, my temp on the low side is -15F at 20 psi. This is only after I recovered and charged by weight.I have a low temp walk-in freezer with R-404A. This unit has a defrost timer that turns off the fans, closes the liquid line solenoid and turns on the electric heater. A room thermostat also closes the liquid line solenoid when not in defrost. What should I set my low pressure control cutin and cutout? I also have a medium temp walk-in cooler R-12 condensing unit using R-414B.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.In air conditioning applications, compression ratios of 2.3:1 to 3.5:1 are common, with ratios below 3:1 and above 2:1 as the standard for modern high-efficiency air conditioning equipment. In a 404a medium-temp refrigeration (cooler) application, 3.0:1 - 5.5:1 is a common ratio range.Walk-in Cooler R409a operating pressures I have a medium temp. When normal ... Normal 404a operating pressures?. The low side should be similar to the stated ...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.OUTDOOR REFRIGERATION SYSTEMS PRE-ASSEMBLED FROM 1/2 HP TO 80 HP. Remote condensing models are split systems with an indoor or outdoor condensing unit (Condensing unit is a single compressor system with a condenser coil and a compressor, used for individual walk-in coolers or freezers. ) that works similar to the central air conditioning unit ...

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.

The market for freezers and walk-in coolers has approached to 12 billion USD in 2020. Moreover, as of 2020, ~30% of the devices were used in the kitchen and restaurant, 30% in the retail store, 15% in health and medicine, ... The pressure (P) versus enthalpy (h) ... R-457A and R-455A as low-GWP replacements of R-404A: experimental evaluation ...Jan 2, 2013 · Forum Rules. 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.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 ...February 2, 2001. The use of a low-pressure control to maintain box temperature on commercial medium-temperature applications has been a common practice for many years. It allows remote condensing units to be controlled without any additional control wiring between the refrigerated box and its compressor. It works on the principle that there is ...Many service technicians often become confused when the liquid line becomes restricted in the refrigeration system. This is because the symptoms often look like an undercharge of refrigerant. This article covers a refrigeration system with a restricted liquid line after the receiver using R-134a as the refrigerant. The refrigeration system is a low temperature freezer with a receiver and a TXV.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.Its 404 refrigerant. I have worked on true reach in freezers and I was told my low side should be at 13 psi and high side at 250. Does this apply to walk in freezers …What is the r-134a refrigerant charge for elkay water cooler? model ebfsa4-1b is 4.8 oz r143a. ... What should the high and low pressures be for 404A refrigerant on a walk in cooler?

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P77 Series. P77 Series pressure controls are precision-engineered for fan cycling pressure applications. The single-pole, double-throw switch lets you install alarms or other control circuits. Use with common refrigerants as well as air, water, and other non-corrosive fluids. Customize to your application with automatic and manual reset and ...R-12 refrigerant, once the most popular refrigerant on the market, was banned in the early 1990's for contributing to the greenhouse gas effect and all production ceased in 1994. R-22 refrigerant was made in the late 1990's to temporarily replace R-12 due to its lower ODP. Production is expected to cease in 2020 and it will be entirely ...The compressor is considered the heart of the refrigeration system. ... and meaningful. For example, when a compressor is operating with R-404A, a head pressure of 331.8 psig (125°F), and a ...Jan 30, 2019 · Pressures Understanding how glide affects both system controls and component sizing is key for a successful retrofit or new store design System Setpoints . ... condensing unit and a walk-in cooler/freezer evaporator with R404A and R407F •The ambient air was fixed (35°C) but the condensing temperature was floating to ...The store owner notices that the temperature in a frozen food reach-in case has been above normal and will not pull down below 15°F. The case temperature is 20° at the present inspection, but ideally it should be between minus 10° and 0°. Customers have been complaining of warm products in this same glass door reach-in freezer for about a week.May 22, 2018 · Today, it’s a walk in freezer w 404. When I arrived, it was completely iced up. I got everything thawed out, I now have it running, but I’m not sure what pressures would be typical. It’s still cooling down from thawing everything out, Currently: 30psig suction/55 superheat (47 if I check at evap) 330 psig head/50 subcool, sight glass clear.Basic Installation of a Kolpak Walk-In Cooler. In this video, you'll learn the basics on the installation procedure, how to inspect each component before installation, area prep and more. For information on installing units like a Kolpak walk-in roof cap with slope, check out this video here. Check out all Kolpak technical training & e-learning ...The normal operating pressure for R-404A in a freezer at a temperature of 70 degrees Fahrenheit and a suction temperature of 30 degrees Fahrenheit would be around 9.6 psi. The low pressure should be 18-20 psi while the high pressure should be around 200 psi.This was a call on a walk in freezer that was not getting cold enough, i found that the expansion valve was not working properly and caused the superheat to ...Im going to be charging a walk in cooler with r404a with a headmaster control. Out door temp will probably 20-30 - Answered by a verified HVAC Technician. ….

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 ...Have not worked with 404A before and I'd like to know what the normal range of operating pressures would be for a cooler at 34 degrees with an ambient outdoor temp of 80 degrees? Thanks Reply Save 1 - 13 of 13 Posts B beenthere · #2 · Feb 8, 2014 What pressure would you expect for R134A, R22, or R12 at those same conditions.R404A will soon be banned in new refrigeration applications in Europe, and from 2020 onwards, only recycled refrigerants can be used for servicing. Here is a list of replies to the many questions we have received related to the best refrigerants to replace R404A in refrigeration applications, the impact on the components and their availability ...refrigerant r-404a (supplemental) - high pressure cut-out control; 395 p.s.i.g. cut-out; shuts unit off in the event of abnormally high discharge pressure. requires manual reset if control trips out. - low pressure cut-out control; 2 p.s.i.g. cut-out; 12 p.s.i.g. cut-in; (low temp); provides for automatic recycling pumpdownStarted Charging a R404A Walk-In Freezer, ambient temp was 30 degrees. HS 155 PSIG< LS 11PSIG. I've read where this website talks about condensing Temp of Ref must be at 105 degrees when doing low ambient charging. My problem was even blocking the condenser couldn't get the 105 degree cond temp with probe located at outlet of king valve.(Temp would only get to 75 degrees).208-230 Volts. Turbo Air STI130MR448A2 Top Mount Medium Temperature Self-Contained Indoor Package - 1 Phase, 13,000 BTU. #902sti130m2v. $5,059.00 /Each. 208-230 Volts. Turbo Air STI070LR448A3 Top Mount Low Temperature Self-Contained Indoor Package - 3 Phase, 7,000 BTU. #902sti70l3w. $7,069.00 /Each. 208-230 Volts.R-407C is a drop-in for R-22 - the same TXV's are cool with either refrigerant. But R-404 valves will not play very nice with R-407C. The flow rates are too different - the R-404 TXV's will tend to over-feed R-407C. Or, looking at it the other other way - R-22/R407C valves will tend to starve the evaps if you flow R-404 through them. <g>.charge should be approximately 85% of the R404A charge by weight. Record the amount of refrigerant charged. 10. Check system operation and operating controls. Start the system and allow conditions to stabilize. The discharge pressure of R407A, R407F, R448A or R449A can be different from R404A and condenser fan and ambientJun 2, 2021 · Refrigeration is about 10*F, rule of thumb, 10*F will at least get you somewhere. Then look at the pressure temperature chart of the refrigerant and there is your answer. Let’s do an example. A walk-in fridge or reach-in fridge with R22 has a desired box temp is 38*F. What is 38*F on a P/T Chart? Around 63 PSI. But we don’t want 38*F, we ... Frozen 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. 404a walk in cooler pressures, About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ..., 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 ..., 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., PRESSURE TEMPERATURE CHART. Phone: 800.953.2244 • Fax: 845.512.6070 • www.hudsontech.com. TEMP R13. R23 R503 R508B . F C -120 -84.4 4.5 4.0 3.1 3.1 81.7-115 - 0.3. 0.3 6.0 6.0 11078.9- - 2.1 2.9 9.3 9.3 10576.1- - 4.7 5.8 12.9 12.9 73.3-100 - 7.6 9.0 16.9 16.9 ..., Sep 13, 2021 · Tighten the screw cap on the Freon tank until it’s firmly closed. Remove the hose from the adaptor and unscrew the adapter from the line. Replace the back panel on the refrigerator or freezer. Remind your customer that supplies of recycled or stockpiled Freon® will become increasingly scarce., What is missing is the ambient temp. R-404a at 120F condensing is around 305psig. If it was in the 90's by the condenser then that is a low head pressure. Low head and high suction pressure = compressor problems. Do what the 1st poster said close the suction service valve and see if it will pump down and hold. , Apr 3, 2023 · FMI –2010 Energy & Store Development Conference HFC Component Comparison 1 –Relative to R-22, Standard Cycle @ 105 F Condenser, 25 F Evaporator, 10 F of Superheat & Subcooling 2 –From the IPCC AR4 3 –L Sub-classification Under Public Review Cond. Pressures (%) 1 V. R. Capacity (%) 1 COP (%) 1 Mass Flow Rate (%) 1 …, Jan 2, 2013 · Forum Rules. 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., This was a call on a walk in freezer that was not getting cold enough, i found that the expansion valve was not working properly and caused the superheat to ..., 3 HP MEDIUM TEMPERATURE PRE-ASSEMBLED REMOTE OUTDOOR REFRIGERATION SYSTEM, R-404A REFRIGERANT (208-230 VOLTS, 60 Hz, 1 PHASE) (3 PHASE ELECTRICAL AVAILABLE UPON REQUEST) INCLUDES: Welded-Hermetic Copeland Compressor. Space saving, compact design. Energy efficient PSC condenser fan motor with overload protection. Quiet fan motor operation., 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 ..., how do u freon guys setup operating pressure controls to operate a walk in veggie cooler 36F 12X12ft. Retrofitting an old R12 system to R414b using existing pressure control with no thermostat control. Old R12 had a pressure/temperature relationship, now new refrigerants have a dewpoint/bubble point glide. System has no defrost clock so I am relying on on/off cycles to cool and air defrost ..., Symptoms of this overcharged system include: High discharge temperature. High condenser subcooling. High condensing pressures. Higher condenser splits. Normal to high evaporator pressures. Normal superheats. High compression ratio. High discharge temperature: With an overcharged system, the high discharge temperature of 240 degrees is caused by ..., 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., 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?, *Red Italics Indicate Inches of Mercury Below Atmospheric Pressure Saturation Pressure-Temperature Data for R404A (psig)* Temp (°F) Pressure Temp (°C) Temp,  · 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 …, 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 ..., *Red Italics Indicate Inches of Mercury Below Atmospheric Pressure Saturation Pressure-Temperature Data for R404A (psig)* Temp (°F) Pressure Temp (°C) Temp, charge should be approximately 85% of the R404A charge by weight. Record the amount of refrigerant charged. 10. Check system operation and operating controls. Start the system and allow conditions to stabilize. The discharge pressure of R407A, R407F, R448A or R449A can be different from R404A and condenser fan and ambient, I do mostly commercial and don't have a lot refrigeration experience. Was called out tonight to a warming walk in refrigerator (40 degree set point). We installed this unit year or two ago. Evap is block of ice after the TXV. I got the sensing bulb and held it awhile and the distribution tubes start thawing. After the coil thawed I got pressures on her, 60/220 R404A., Feb 8, 2023 · The normal operating pressure for R-404A in a freezer at a temperature of 70 degrees Fahrenheit and a suction temperature of 30 degrees Fahrenheit would be around 9.6 psi. The low pressure should be 18-20 psi while the high pressure should be around 200 psi. However, this can vary depending on the specific conditions of the freezer and the ... , On a 404a freezer, the evaporator has a temperature of -18F degree and the sight glass is partially full (i can see a stream of refrigerant at the bottom of the sight glass) the condenser temperature is 96F degree on a 62F degree day.And this is a txv system. Half of the evaporator has ice build up and it started from the txv. Is it under …, If you check the chart above, you can see that the pressure of the liquid R404A refrigerant is 236.8 psig. If you are measuring the pressure of a 404A gas ( ..., Clean walk-in cooler and walk-in freezer condenser coils. Check fan motor and its electrical circuit. Reclaim excess refrigerant. Low discharge pressure. Insufficient refrigerant in system. Low suction pressure. Check for leaks; repair and add charge. See corrective steps for low suction pressure. High suction 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., 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. , Sep 20, 2022 · 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 ... , 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 ..., Other refrigerant options that meet the requirements of industrial refrigeration systems include: Freon™ 134a (R-134a) Freon™ 23 (R-23) Freon™ 404A (R-404A) Freon™ 407A (R-407A) Freon™ 507 (R-507) Long-Term Use Considerations. Regulations on the long-term use of refrigerants vary by region and application, and may change over time., 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., On R-404 that is about 205 lbs. head. Based on what I said above; on a 40º box that would be: normal operating suction pressure = about 70 lbs. plus 125 = 195 lb. head pressure. So in that case - pretty much in agreement. But on a 0º freezer the standard suction would be 25 lbs., February 2, 2001. The use of a low-pressure control to maintain box temperature on commercial medium-temperature applications has been a common practice for many years. It allows remote condensing units to be controlled without any additional control wiring between the refrigerated box and its compressor. It works on the principle that there is ...