What should the running line prussure be with 404a freon in a freezer

evap temps usuall run 10-15 degrees below the box temp.This a generally accepted rule of thumb.

TRY TO ACID WASH CONDENSER. AND CHECK IF YOUR YOUR EVAPORATOR MOTORS ARE RUNNING.

Has this happened suddenly? Look at the shelves to see if there is a frost line. If the shelves that also carry the Freon appear to have a frost line your freezer may have a Freon leak. If there is a Freon leak it will be better to begin looking for a replacement freezer. Let me know what you see, Thanks Sea Breeze

Hi, most chest type freezers do not come with service valves to add freon. Why, don't know but its frustrating to me as a commercial Refrigeration Contractor. If you are sure you have a leak, and you know its low on charge, check the data plate to see what freon it takes. Most older models have R-12. Some are 134-A, and I have had some that are R-404A. If your lucky, it will be the 134-A that you can buy at any auto store. When I come across a unit like this, I have what is called a bullet piercing valve or saddle valve that is attached to the suction line of the unit. It is a 2-piece valve that has adapters to fit lines from 1/4" to 3/8" lines. You can find ones for larger lines. They are held on with 3- Allen head screws tightened down evenly so they don't leak when you pierce it. It has a 1/4 " fitting for a service tech's manifold gauges. Your problem would be if it is 134-a, is the hose kit will not fit the valve, as they are made to fit a auto fitting. I know they sell adapters at refrigeration parts houses to convert these to fit, but you need to be a contractor. If you have a Grangers any where near you, this will be your best bet to get both the saddle valves, and the adapter you will need. If you had any way to get a regular service manifold set, that would be a plus. I know this will be your hold up, that and freon if its not the 134-a. Anyway, thats how its done by installing a bullet piercing valve. Once its clamped on the line, the larger of the 2 coming off the compressor, there is a set screw in the center of valve. With hose attached, screw the set screw down to pierce the can. Now, once it is down, it will not flow until you turn the set screw back the other way. When you know you have enough, turn it back to shut it off. Remove the hose and put the supplied cap on the valve. Thats how its done. I wish you the best of luck.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor.
Please don't forget to rate me as I know you will be kind. I will check the comment box if you need more help, so leave me a comment if you do. Thank you!

http://www.delfield.com/docs/uploaded/del/Serviceinfo/ref_serv.pdf
this web site has a table of units and their respective charging amounts.
Hope this does it for you.

http://www.delfield.com/?xhtml=xhtml/del/us/en/general/partsandservice/archivemanuals.html&xsl=minisite.xsl
this is for their web site. It has all the manuals and charging tables. There is no 6000xl. Need exact model number as the amount varies.
Hope this helps

Depends on how technical you want to get. Generally, measure the ambient temp of air entering the condenser coil. Add 30 degrees to that temp and convert to psi using a P/T chart. This will get you to a starting point.Remember, charging a "Hot" box takes time. Don't over charge.

For a 404 system pressures should be about 60/350 Remember when you recharged always with the freon drum upsidedown so liquid gas is going in to the system.But if it's freezing up could be the thermostat or the timer or the heaters.

• if you are tapping into a sealed system, then you use the larger of the two copper lines coming out of the side of the compressor (this is the low pressure line, the compressor pulls from this side).
• clean off the copper tubing with some fine sandpaper before installing your tap.
• it is very easy to over fill a system with freon, so i would recommend pulling down the system to -30 psi and holding for at least 20 minutes. then add a known amount of freon to the system. 
• let it run for a while, it will take a little time to get the temperatures down.
  

Normal operating pressures will change as the freezer reaches the selected temperatures on the inside. Normals of minus 14 degrees on the inside would be around minus 4 psi on the suction and 150 pis on discharge. Now checking the pressure will require a set of guages that have been purged with the same freon before connecting with the suction line on freezer. If not purged the suction line will draw outside air into the system and cause freezing of air and moisture inside the capillary tube rendering the freezer inoperative, Hope this helps, Sea Breeze