Consult a PT chart most all of them have 404a do a simple google search for a 404a pt chart and im sure you will. Compacted bead type driers can use XH6 or XH9 molecular sieve material such as found in the Emerson Climate Technologies Inc.
R-404A rose to prominence in the late 1990s with the phasing out of CFC and HCFC refrigerants like R-12 and R-502.
404a walk in cooler pressures. The liquid line pressure would also need to be higher then the saturation temp of the outdoor ambient so liquid line pressure would be at least 254. We bought components to build our own walk-in freezer. I found my high side extremly high 350.
Pressure regulators such as EPR valves may have to be reset. Does this apply to walk in freezers too. While the system is running the refrigerant temp in the evap would generally be at 24 so 32 suction pressure while running.
He said it seams to always be in defrost. Half of the evaporator has ice build up and it started from the txv. 18-20psig suction 250-270 psig discharge In freezers pressures are ok I got it but the mention.
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. 404A was originally implemented as a replacement option for the now banned CFC R-502. The liquid line is hot around 115f the superheat is a tad under 30 but the unit is still coming down to temp.
It seems like it may be low on refrigerant but I have no idea what the operating pressures are suppose to be. I am at my wits end. Excessive suction pressure beyond the limits of the compressors ability to start and run.
When walk-in cooler and walk-in freezer are off-work for a long period of time main power supply should be shut down. I am working with Larkin walk in freezer. LCE676BB 2 fan single phase 230V liquid line solenoid piping 404A etc.
According to the sales guy well need 14 pounds to charge. Check fan motor and its electrical circuit. What is the normal suction pressure on a 404a walk in freezer.
Hi guys Im having a hard time trying to figure out what the operating pressures would be on a 404a walk in freezer. If a loose fill type drier is to be used XH9 molecular sieve material is required. All valves are set properly for efficient operation.
What should the high and low pressures be for 404A refrigerant on a walk in cooler. To get us down to -20F at least. You can find it most commercial refrigeratorsfreezers in vending and ice machines in refrigerated transport and in specific industrial applications.
I checked out the system after defrost and it is freezing far to quickly. This is common on walk in coolers and freezers when the condensing unit is mounted on the box and closed off by a drop ceiling. Insufficient refrigerant in system.
And have you checked the settings recently. Not sure if this unit is over charged what do you think. For high side and air cooled take 50F ambient 30F.
18-20psig suction 250-270 psig discharge In freezers pressures are ok I got it but the mention pressure of suction 18-20 discharge 250-270 at what temprature in centegrade it should be. 404As reign however was short lived. 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.
Check that to your pt chart for 404a I would expect to see a pressure of around 16psig. I am concerning the suction pressure is going. R404a Refrigerant Pressure Chart.
Today the HFC R-404A is one of the most commonly used refrigerants in the United States and in the world. Make sure that. Repair and add charge.
Evap was not iced up. Started the unit inverted the bottle to charge liquid and got. I built this cooler a small glass door wine cooler from scratch and it has a new condensing unit 404a med temp 14.
I just wanted to know what are normal pressures for freezers. High sc and txv iced up would high sc cause txv to ice up. The pressures im working with are 65psig and 325psig with an ambient temp of 70f.
EK or EKH series. Depending on where the condensing unit and evap coils are surrounded by. However in order to know the proper pressure you also need to identify the correct corresponding temperature.
Clean walk-in cooler and walk-in freezer condenser coils. Trying to maintain a -10 degree box. Never had to work on a 404a system.
A friend of mine had me check out a reach in freezer at his restaurant. Power voltage is within 10 of that indicated on the condensing unit. The chart below helps you know what pressure R404a should run at.
When conducting repairs or diagnostics on a commercial cooler or freezer with R404a refrigerant checking the pressure is key. In order to have the coolers temp at 34. 404A walk in freezer frozen txv.
Whats the make and model. Here is what I did today when I had this call. Larkin scroll compressor unit 25 hp 230V 3 phase LZT025L6C with a Larkin Evaporator.
All electrical terminals are correctly tightened. Is it under charge. 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 dayAnd this is a txv system.
What would you consider a too high pressure for a medium temp unit using 404a. Check the performance charts of the compressor for the maximum suction pressure. See corrective steps for low suction pressure.
I am a Journeyman but I strictly work on residential units. Yes Im not where freezer is but it was at 30 suction pressure but evaporator freezes up in about 2 hours. 404A walk in freezer frozen txv.
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