Walk In Freezer 404a Pressures

Walk In Freezer 404a PressuresIts 404 refrigerant. Low head and high suction pressure = compressor problems. 5 psig (0°), and the high side reads 174 psig (80°). usinga magnet or energizing the solenoid Add 50 PSI refrigerant, then pressurize with dry nitrogen to 250 PSIcoil. Help setting cutin and cutout LPC for a walk. i have a 404 freezer walk in box that is giving me trouble. Subtract the two numbers to get superheat. R404a Refrigerant Pressure Chart. Do what the 1st poster said close the suction service valve and see if it will pump down and hold. 404a Refrigerant Temperature Pressure Chart – techtownforum. Pressure Settings for Typical ">P70, P72 Approximate Low Pressure Settings for Typical. When conducting repairs or diagnostics on a commercial cooler or freezer. R404A PT Chart PDF (Printable PDF For On-Site Use). For R-404A Low Temperature 1 psi; for R-404A and R-22 Medium Temperature 2 psi is used. MAKE SURE THAT THIS FAN CYCLES OFF JUST ABOVE THE POINT WHERE THE HEAD PRESSURE CONTROL VALVE BEGINS TO BYPASS HOT GAS TO THE RECEIVER INLET; (TYPICALLY 200 POUNDS ON R-404A. HOW TO ADD R404A REFRIGERANT INTO UPRIGHT FREEZER. What is the correct suction pressure when charging a true freezer using refrigerant 404a? frezer not frezing hi side 250 psi low side 45 psi What is the running pressure of car. What is the low side pressure for R404A? 8-10PSIG. For Ede and AdE control options continue to Steps 2, 3, &4. Compare the amp reading of the compressor to the manufacturer’s amp curves for the pressures recorded. The discharge pressure at this operating conditions hovers around 400 Psig. For blend refrigerants such as R-404A, and R-452A use the “dew” (vapor) pressure to calculate superheat. Does this apply to walk in freezers too?. For leak testing it's the same process as any system should be: pressure test and check all pipework for areas where pressure is escaping. Copelametic™air-cooled condensing units Product Information Horsepower: 1 – 10 Temperature Applications: Low/Medium/High Refrigerants: R-12, R-134a, R-404A, R-22, R-407C Installation Applications: A variety of applications including walk-ins Bill of Materals Matrix. E High Temperature B R22/404A LT & R134a HT G R22 HT & R404A MT J R404A LT & R134a HT K Two. Freezers should pull down to 0°F in about 1hr when located in an ambient of about 75 °F. R-404A Pressure Chart Knowing the pressure and the temperatures associated to the machine you are working on is essential to being able to diagnose any possible issues. For R-404A Low Temperature 1 psi; for R-404A and R-22 Medium Temperature 2 psi is used. And the high side should be about. When and How to Adjust a Thermostatic Expansion Valve (TXV). One of the very first steps when it comes to diagnosing your home air conditioner, refrigerator, or even your vehicle’s air. What should the high and low side pressures be for 404A? It is necessary to have the temp at 34. 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. 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. What should 404a suction pressure be? What should my pressures be on a 404a cooler? The normal head pressure should be between 210-260 psi. com R404a Refrigerant Pressure Chart Temperature (Fahrenheit) Pressure Temperature (Celsius) R404a -. What is the low side pressure for R404A? 8-10PSIG When the temperature inside the freezer is at about 0°F, the low side pressure should be 8-10PSIG for R404A charged units. If the system is then pumped down for any reason, dangerous head pressures will result. When the temperature inside the freezer is at about 0°F, the low side pressure should be 8-10PSIG for R404A charged units. This unit has a defrost timer that turns off the fans, closes the liquid line solenoid and turns on the electric heater. R134A runs at 0psi on the low side and 404A runs at 55psi. 2K views 2 years ago From https://www. This is caused from a lack of internal volume in the condenser to hold the added refrigerant. What should I set my low pressure control cutin and cutout?. For blend refrigerants such as R-404A, and R-452A use the “dew” (vapor) pressure to calculate superheat. Walk in cooler temperatures and pressures - YouTube 0:00 / 4:22 Walk in cooler temperatures and pressures Weaver Maintenance 41 subscribers Subscribe 28 Share. If you check the chart above, you can see that the pressure of the liquid R404A refrigerant is 236. Low head and high suction pressure = compressor problems. R-404A Pressure Chart Knowing the pressure and the temperatures associated to the machine you are working on is essential to being able to diagnose any possible issues. What is the low side pressure for R404A? 8-10PSIG. 404A is a non-ozone depleting hydrofluorocarbon (HFC) refrigerant, while 407A is a blend of hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs). When the temperature inside the freezer is at about 0°F, the low side pressure should be 8-10PSIG for R404A charged units. Then take the suction pressure and convert it to temperature on a temperature/pressure chart. Do what the 1st poster said close the suction service. What should the pressures be on a walk in freezer with 404A? If it works properly, it should be running at 10 to 20psig. These pressure checks give you the facts so that you can move onto the next step of your diagnosis. Assume you replace a low pressure control that acts as the temperature control on an R22 reach-in refrigerator that maintains 38°. 30 suction pressure is definitely a bit high. Pressures similar to 502, head may be a little higher under load or in hot weather. com%2f404a-freezer-pressures%2f/RK=2/RS=DIv_r4TmS9AshL9GCzkz2NQ3TmI-" referrerpolicy="origin" target="_blank">See full list on fixitinthehome. The temperature around the compressor rises resulting in higher head pressure for the compressor, which again increases compressor power. I think we have definetly determined your high side pressure is above normal. Refrigerant R404A I set them to cut out just above atmospheric pressure and cut in about 30PSI (203kPa). R-404A Pressure Chart Knowing the pressure and the temperatures associated to the machine you are working on is essential to being able to diagnose any possible issues. The liquid line pressure needs to be higher than the outdoor ambient’s saturation temp, so it would be at least 257. usinga magnet or energizing the solenoid Add 50 PSI refrigerant, then pressurize with dry nitrogen to 250 PSIcoil. com/_ylt=AwrEafYvAF9kunwQ5YtXNyoA;_ylu=Y29sbwNiZjEEcG9zAzIEdnRpZAMEc2VjA3Ny/RV=2/RE=1683976367/RO=10/RU=https%3a%2f%2ffixitinthehome. Actual values may varywidely, depending on application-specific guidelines. com R404a Refrigerant Pressure Chart Temperature (Fahrenheit) Pressure Temperature (Celsius) R404a - 50°F - 45. What is the correct suction pressure when charging a true freezer using refrigerant 404a? frezer not frezing hi side 250 psi low side 45 psi What type of refrigerant do you need in a high. Let's say the suction line temperature is 50°F. R404A runs similar pressures to R22 which you're probably more familiar working with in the US. It should be running at 10-20psig (10 is ideal) on the suction side if working properly. R-404a at 120F condensing is around 305psig. I have a low temp walk-in freezer with R-404A. The low pressure should be 18-20 psi while the high pressure should be around 200 psi. unit on Evacuationof“PC”modelsystems:. Description The settings in the following table representapproximate starting values. Pressures similar to 502, head may be a little higher under load or in hot weather. THERMOBANK CONTROL SETTINGS R404A. Understanding 404A Refrigerant Pressures in a Walk. The technician installs gauges on the low and high side of the compressor and takes an amperage reading. To calculate subcooling use the “bubble” (liquid) pressure. Release/reclaim nitrogen charge. What pressure should a 134a freezer run at? Conclusion. R134a Pressure Chart for Refrigerators, Prep Tables & More. R-404a at 120F condensing is around 305psig. pressures be on a walk in freezer?">What should my pressures be on a walk in freezer?. What pressure should a 134a freezer run at? Conclusion. How to Adjust a Kolpak Walk-In Door Sweep; Replacing a Kolpak Walk-In Freezer Door Heater Wire; Adjusting Kolpak Walk-In Cooler Door Hinges & Closers; Replacing a Kolpak Walk-In Door Gasket & Handle; Kolpak Walk-In Cooler Installation; What Pressure Should R404a Run at on a Cooler? What is R134a Replacement? Manitowoc Ice Training. When conducting repairs or diagnostics on a commercial cooler or freezer with R404a refrigerant, checking the pressure is key. The proper pressures for a walk in freezer 404A are critical to ensuring the safety and performance of the unit. With the help of a wrench and the backing wrench with the adjustable screw, the technicians are challenged to remove the hex cap located on the base of the TXV valve. Post Likes Normal Freezer Pressures I am working with Larkin walk in freezer. Look around the expansion valve, driers, solenoid valves, etc. Subcooling and Superheat: Superheroes of System Charging. 1°C) Critical temperature: 252°F (122°C) Auto ignition temperature: 1,418°F (770°C) Ozone depletion level (ODL): 0 Global warming potential (GWP): 1,430. Does this apply to walk in freezers too? Here is what I did today when I had this call I found my high side extremly high 350. R404a Refrigerant Pressure Chart. Without knowing the temperatures you are more or less walking blind. And the high side should be about 180 or so. I'd say 210psi would be the minimum you would be looking for when the systems running. com/ythi JustAnswer Customer: What is the. Subtracting the two numbers gives us 10°F of superheat. P70, P72 Low pressure settings for typicalapplications Table 1: P70, P72 approximate low pressure settings for typical applications Vacuum - in. Freezers should pull down to 0°F in about 1hr when located in an ambient of about 75 °F. Suction pressure of an Air-Conditioner with R410A Refrigerants typically ranges between 115 Psig to 125 Psig when operated at an ambient temperature of 35. Guidelines for Utilization of R. SET ALL THERMOSTAT DIFFERENTIALS TO 5 DEGREES. What should the suction pressure be on a 404a walk in freezer? If it works properly, it should be running at 10 to 20psig. The chart below helps you know what pressure R404a should run at. These pressure checks give you the facts so that you can move onto the next step of. HOW TO ADD R404A REFRIGERANT INTO UPRIGHT FREEZER OCT TV 9. When conducting repairs or diagnostics on a commercial cooler or freezer with R404a refrigerant, checking the pressure is key. when the fan kicks in pressures rise to 25/270 psig. Even the receiver may overfill if too much refrigerant is added. What should my pressures be on a walk in freezer?. I just wanted to know what are normal pressures for freezers. If it was in the 90's by the condenser then that is a low head pressure. I have a low temp walk-in freezer with R-404A. How to check subcooling R410A?. For example, 68 psi suction pressure on a R-22 system converts to 40°F. Suction pressure of an Air-Conditioner with R410A Refrigerants typically ranges between 115 Psig to 125 Psig when operated at an ambient temperature of 35 degC. What Pressure Should R404a Run at on a Cooler?. It works harder because the suction pressure drops making the compressor work at a higher differential pressure, thus requiring more power. -19 deg C My co worker sets them the same as me except he sets the cut in at about 40 PSI (273 kPa). Department of Energy (DOE) is amending the test procedures for walk-in coolers and walk-in freezers to harmonize with updated industry standards, revise certain definitions, revise the test methods to more accurately represent field energy use, and to accommodate a wider range of walk-in cooler and walk-in freezer component equipment. R404A/507 J/4 R134a T/2 R12 B/7 R22 3/M/L/C Multiple F R22/407C G R22 9 R134a/404A/22 N R134a/404A P R404A/22 8 Temperature Application Description Code High Temperature H Medium Temperature M Low Temperature L Extended Medium Temp. Step 1. March 20, 2019 by Alec Johnson One of the very first steps when it comes to diagnosing your home air conditioner, refrigerator, or even your vehicle's air conditioner is understanding the temperature and the current pressure that your system is operating at. Suction pressure seems a bit. Walk in cooler temperatures and pressures. Make sure it is within the range (±5 percent) for the pressures and voltage recorded. It works longer because heat transfer is reduced. R404a Refrigerant Pressure Chart. The proper pressures for a walk in freezer 404A are critical to ensuring the safety and performance of the unit. Temperature Pressure °F °C -40 -40 -30 -34 -20 -28 -10 -23 0 -18 10 -12. Does this apply to walk in freezers. What should the suction pressure be on a 404a walk in freezer? If it works properly, it should be running at 10 to 20psig. refrigerator using R404A in an outdoor condensing unit. 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. When the system is running, the temp in the evap is usually 24 so 32 suction pressure. 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. 404a Walk In Freezer Pressures Factory and ">Wholesale 404a Walk In Freezer Pressures Factory and. 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. One of the very first steps when it comes to diagnosing your home air conditioner, refrigerator, or even your vehicle’s air conditioner is understanding the temperature and the current pressure that your system is operating at. Ideally you want to get the head pressure up to around 38'C SCT which on R404a is about 240psi. This indicates low refrigerant in the evaporator. What is the normal suction pressure on a 404a walk in. To effectively remove heat, the condenser should be placed in a well-ventilated area where the temperature is controlled to allow heat to be removed easily. When ice buildup is excessive, the compressor will run all the time and the freezer temperature setpoint will not be maintained. The amperage reading is 5 A under the nameplate’s rated load amps (RLA). com R404a Refrigerant Pressure Chart Temperature (Fahrenheit) Pressure Temperature (Celsius) R404a - 50°F - 45. The chart below helps you know what pressure R404a should run at. Diagnosing Problems in Walk. Commercial Refrigeration – Walk. pressure of a freezer using R. Set the control up to open at the pressure equivalent to 90ºF condensing temperature and close at 40 psi above that. 60 psig cut-in and 40 psig cut-out 21. R404A PT Chart: Pressure Temperature Chart For. SET ALL THERMOSTAT DIFFERENTIALS TO 5 DEGREES. 404A has a higher pressure than 407A at similar temperatures, meaning it requires more energy to maintain the temperature in a walk-in freezer. Refrigerant R404A I set them to cut out just above atmospheric pressure and cut in about 30PSI (203kPa). What are normal operating pressures for R. We are on the honor system here. What should the pressures be. 30 suction pressure is definitely a bit high. while operating, the first row that is fed by the distributor nozzle start forming a snow blanket, causing my airflow to lower and loss of air flow eventually. To calculate subcooling use the “bubble” (liquid) pressure. PDF Guidelines for Utilization of R. LUBRICANTS - POLYOL ESTERS (POE's) Miscibility Miscibility is the ability of the lubricant and the refrigerant to mix. What should the superheat be on a 404A walk in cooler? Ideally you want to get the head pressure up to around 38'C SCT which on R404a is about 240psi. 404a Walk In Freezer Pressures - China Factory, Suppliers, Manufacturers Dependable high-quality and fantastic credit standing are our principles, which will help us at a top-ranking position. 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. What should the high and low side pressures be for R404A?. However, this can vary depending on the specific conditions of the freezer and the. Let's say a system has 45 psi suction pressure (converts to 22°F) and 68°F suction line temperature, the superheat is 46°F (68 minus 22). What should the pressures be on a walk in freezer with 404A? If it works properly, it should be running at 10 to 20psig. Correct Super Heat For Walk In Freezer. R134a Pressure Chart for Refrigerators, Prep Tables & More">R134a Pressure Chart for Refrigerators, Prep Tables & More. It should be running at 10-20psig (10 is ideal) on the suction side if working properly. I was recently having a debate with a co worker on pressure control settings for a low temp walk in freezer with pump down. 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. 404a Refrigerant Temperature Pressure Chart – techtownforum. The difference between liquid and vapor pressure here is 2. What is the normal suction pressure on a 404a walk in freezer. If it was in the 90's by the condenser then that is a low head pressure. If you are measuring the pressure of a 404A gas (vapor), your gauge meter should read 234. Subcooling and Superheat: Superheroes of System Charging">Subcooling and Superheat: Superheroes of System Charging. Copelametic™air-cooled condensing units Product Information Horsepower: 1 – 10 Temperature Applications: Low/Medium/High Refrigerants: R-12, R-134a, R-404A, R-22, R-407C Installation Applications: A variety of applications including walk-ins Bill of Materals Matrix. It should be running at 10-20psig (10 is ideal) on the suction side if working properly. High evaporator and compressor superheats; Low compressor amp draw; Short-cycling on the low-pressure control; Somewhat high discharge temperature; Low condensing (head) pressure; Low condenser split; and Normal to a bit high condenser subcooling. R-404a at 120F condensing is around 305psig. Suction pressure of an Air-Conditioner with R410A Refrigerants typically ranges between 115 Psig to 125 Psig when operated at an ambient temperature of 35 degC. Energy Conservation Program: Test Procedures for Walk. COM">What should a refrigerator suction pressure be? – KOOLOADER. 404a Refrigerant Temperature Pressure Chart - techtownforum. What should the superheat be on a 404A walk in cooler?. What is the correct suction pressure when charging a true freezer using refrigerant 404a? frezer not frezing hi side 250 psi low side 45 psi What type of refrigerant do you need in a high. A room thermostat also closes the liquid line solenoid when not in defrost. R404A/507 J/4 R134a T/2 R12 B/7 R22 3/M/L/C Multiple F R22/407C G R22 9 R134a/404A/22 N R134a/404A P R404A/22 8 Temperature Application Description Code High Temperature H Medium Temperature M Low Temperature L Extended Medium Temp. pressures be for R404A?">What should the high and low side pressures be for R404A?. On a 404a freezer, the evaporator has a temperature of. Note: For mechanical valve control, Ed and Ad options, continue to Step 4. 30 suction pressure is definitely a bit high. What should a refrigerator suction pressure be? – KOOLOADER. The discharge pressure at this operating conditions hovers around 400 Psig. For the same amount of subcooling, R-404A and R-452A produce a greater refrigerating effect than R-502. The pressure on the low side reads 33. Suction 20-45 depending on inside temp. If the pressure is too low, the unit may not cool adequately, leading to food spoilage and safety risks. PDF R404a Refrigerant Pressure Chart. LP-cut out around 5 psi, don't pull into a vacuum. superheat of 20°F is required at the compressor. 404a Refrigerant Temperature Pressure Chart – techtownforum. 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. 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. setting LP control on pumpdown system. Cut in about 30 HP-450 SH-6-8 Keep it clean, pull a hard vacuum before charging. It is a Friday evening and the factory is closed, so you cannot get any information on settings. This is the maximum allowable pressure drop for the entire piping run regardless if it is 50' or 250'. Cleaned condensor and made sure both of my fans were running. What is the normal suction pressure on a 404a walk in JustAnswer-Q&A 6. What should the suction pressure be on a 404a walk in freezer? If it works properly, it should be running at 10 to 20psig. Both spring-pressure and suction pressure serve to close it. com R404a Refrigerant Pressure Chart Temperature (Fahrenheit) Pressure Temperature (Celsius) R404a - 50°F - 45. The technician puts an insulated temperature probe on the condenser’s. Department of Energy (DOE) is amending the test procedures for walk-in coolers and walk-in freezers to harmonize with updated industry standards,. Step 1 - Using the andarrows, moves the user through the avail-able Types of Control options. 78K subscribers 282 31K views 1 year ago #OCTTV #HVACR A step by step troubleshooting ice built up on evaporator and adding refrigerant. There had to be a replacement for the Ozone damaging refrigerants of the past and the successor was the HFC R-404A that we all know of today. The low pressure should be 18-20 psi while the high pressure should be around 200 psi. 404A’s reign however was short lived. What is the correct suction pressure when charging a true freezer using refrigerant 404a? frezer not frezing hi side 250 psi low side 45 psi What is the running pressure of car. R-410A operates at pressures 50 to 70% higher than those of R-22. What should a refrigerator suction pressure be? – …. When the temperature inside the freezer is at about 0°F, the low side pressure should be 8-10PSIG for R404A charged units. Department of Energy (DOE) is amending the test procedures for walk-in coolers and walk-in freezers to harmonize with updated industry standards, revise certain definitions, revise the test methods to more accurately represent field energy use, and to accommodate a wider range of walk-in cooler and walk-in freezer component. If the pressure is too high, it can lead to compressor damage and inefficiency. When the temperature inside the freezer is at about 0°F, the low side pressure should be 8-10PSIG for R404A charged units. The temperature around the compressor rises resulting in higher head pressure for the compressor, which again increases compressor power. Maintain 404a Freezer Pressures. R404a Refrigerant Pressure Chart. Make sure it is within the range (±5 percent) for the pressures and voltage recorded. 30 suction pressure is definitely a bit high. A step by step troubleshooting ice built up on evaporator and adding refrigerant is hereby detailed here and adjusting defrost settings of dixell digital con. PRESSURE CONTROL; FAN # 1; (COMPRESSOR END FAN); CUT-OFF @ 210 P. After all system checks have been checked, properly adjusted, and verified, replace all schradercaps, service valve. However, in order to know the proper pressure, you also need to identify the correct corresponding temperature. How to Adjust a Kolpak Walk-In Door Sweep; Replacing a Kolpak Walk-In Freezer Door Heater Wire; Adjusting Kolpak Walk-In Cooler Door Hinges & Closers; Replacing a Kolpak Walk-In Door Gasket & Handle; Kolpak Walk-In Cooler Installation; What Pressure Should R404a Run at on a Cooler? What is R134a Replacement? Manitowoc Ice Training Resources for. 100 degrees f for R-404a on a pt chart= 235psi Normal estimated press is 235 +/- 25 psi The normal head pressure should be between 210-260 psi. What is the low side pressure of a freezer using R. The unit is operating 18/260 psig on initial start up. To increase the superheat, technicians are allowed to turn it clockwise with the help of a refrigerant wrench. This reference should remain on site with the installed OEM. Once the preferred option is displayed press and hold theENTERbutton for 3 seconds. SUCTION & LIQUID LINE SIZING CHARTS USING LINE. High evaporator and compressor superheats; Low compressor amp draw; Short-cycling on the low-pressure control; Somewhat high discharge temperature; Low condensing (head) pressure; Low condenser split; and Normal to a bit high condenser subcooling. Normal head would be 200-350 depending on outside temp and load conditions. What is the low side pressure for R404A? 8-10PSIG. However, this can vary depending on the specific conditions of the freezer and. If the pressure is too low, the unit may not cool. R404A">THERMOBANK CONTROL SETTINGS R404A. Anything with a mechanical flare connection. R-404A rose to prominence in the late 1990’s with the phasing out of CFC and HCFC refrigerants like R-12 and R-502. Record the condensing and evaporating pressure of the system. The high side should be around 180. However, before adding refrigerant, check the subcooling to be sure the problem isn't caused by a defective, plugged, or undersized metering device. HOW TO ADD R404A REFRIGERANT INTO UPRIGHT …. However, in order to know the proper pressure, you also need to identify the correct corresponding temperature. This is no longer always true - but if you imagine that the TXV bulb/powerhead charge is the same. The advantage of the graphic representation of this information is to show just how close to full capacity a particular selection is. to Adjust a Thermostatic Expansion Valve (TXV)">When and How to Adjust a Thermostatic Expansion Valve (TXV). Allowthirtyminutesforrefrigerantto Checkalljointsandcomponentswith reachallpartsof anelectronicleak the system. At what pressure. The Symptoms of a Restricted TXV. For blend refrigerants such as R-404A, and R-452A use the “dew” (vapor) pressure to calculate superheat. Refrigerators should pull down to 35°F in about 20 minutes when located in an ambient of about 75 °F. The temperature around the compressor rises resulting in higher head pressure for the compressor, which again increases compressor power. What should the pressures be on a walk in freezer with 404A? If it works properly, it should be running at 10 to 20psig. A step by step troubleshooting ice built up on evaporator and adding refrigerant is hereby detailed here and adjusting defrost settings of dixell digital con. For R404A that would be CO at 205 psig. Department of Energy (DOE) is amending the test procedures for walk-in coolers and walk-in freezers to harmonize with updated industry standards, revise certain definitions, revise the test methods to more accurately represent field energy use, and to accommodate a wider range of walk-in cooler and walk-in freezer component equipment. 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 Outdoor ambient: 62 Freezer temp: 34 (working its way down) TD 5 degrees I do have a significant layer of frost on the 3 dist tubes coming off of TXV. Evaporator superheat for coolers (6-10 degrees) and freezers (4-8 degrees). What is the normal suction pressure on a 404a walk in JustAnswer-Q&A 6. I was recently having a debate with a co worker on pressure control settings for a low temp walk in freezer with pump down. Troubleshooting a Warm Freezer. Suction pressure seems a bit ">Walk. What should the high and low pressures be for 404A. This is caused from a lack of internal volume in the condenser to hold the added refrigerant. Five Rules for Charging Refrigeration Systems.