Question about Freezers

Open Question

Whats the 404a high pressure - Freezers

Posted by on

Ad

4 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya Repairman can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Repairman (only for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
Sea Breeze
  • 4654 Answers

SOURCE: normal operating pressures

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

Posted on Nov 02, 2007

Ad
  • 358 Answers

SOURCE: i have a ice maker that keep freezing up. the

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.

Posted on Aug 14, 2009

masterrrex
  • 45 Answers

SOURCE: head pressure too low

Charge until the sight glass is full. I suspect your pressures will be be better. 12 psig is low even if the case is down to temp. I suspect once the sight glass is full you'l be runniing in the upper 20's.

Posted on Apr 06, 2012

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Delfield 6000 series 404a, need running pressure in 94 degree kitchen


300-350 on high side. Way too high. Most all commercial unit are built to live in an environment of not more than about 80. Some survive 85. Above that, it's will die due to over working and heating.

Jul 14, 2016 | Delfield Freezers

1 Answer

What is the suction pressure low side and high side charging 404a refigerant cooling temperature


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

Sep 15, 2014 | Delfield Freezers

1 Answer

What should be my pressure on a Delfield 404A refrigerator


As a general rule of thumb, pressure on low side should equal a temperature of about 17-18 degrees if the box is not hot and a high side of ambient plus 30. Again, this is a general rule of thumb that usually gets you close enough to get a unit working providing all other things are right.

May 20, 2014 | Continental Manufacturing Company...

2 Answers

What happens if you would add a charge to a running system that has a low charge on a 404a system and you charge thru the suction as a vapor. I had a memory lapse and have charged 410 systems as a liquid...


as long as you recovered the charge, pulled a vacuum, changed the filter/dryer, and added the correct amount of refrigerant as a liquid, you should be good to go.

Jun 28, 2017 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Head pressure too low


Charge until the sight glass is full. I suspect your pressures will be be better. 12 psig is low even if the case is down to temp. I suspect once the sight glass is full you'l be runniing in the upper 20's.

Apr 02, 2012 | Freezers

1 Answer

What should be my pressure on a 404a freezer


usually depends on the temp of the conditioned space. Most freezers run about a minus 10 evap to get a 0 degree box. So look for a low side pressure of about 25. High side is ambient plus 30. A 75 degree ambient, for example, add 30 and get 105 degrees. That, on a P/T chart converts to about 253 psi. Those are approximate but I'm sure you can use this to fugure out what to look for.
let me know if you need more help.

Sep 27, 2010 | Continental Manufacturing Company...

1 Answer

Need to know the design superheat also normal pressures on this unit with 404A refrigerant


The McCall web site has nothing easily found on the 7-7045FT unit.
In answer to you questions, first, what is the expansion device. TXV, Cap Tube, or something else?
Low site pressure will be dictated by the super heat. The high side, in many cases, is usually ambient plus 30, then convert to psi.

Let me know if you need more info. And please double check the model number/ serial numbers.

good luck

Oct 17, 2009 | McCall Freezer 7-7045FT

3 Answers

Normal Operating pressure for true 2 door Freezer R404A Room Under 80 degrees F Box at -10 degrees F


The pressures depend, somewhat, on the expansion device,i.e. a TXV or Cap Tube. Take a pressure reading, then convert it to a temperature. The evap temp should be right at 10 colder than the box temp. Remember, heat flows to cold so the evap has to "Lead the Load" in order to cool. In many cases, the condensing pressure is usually ambient temp, plus 30, then convert to a pressure. These are general accepted practices that have been used for many years.

Hope this helps

Jul 11, 2009 | True 49 cu. ft. / 1388 liter Commercial...

1 Answer

Evaporator unit keeps on building ice. question what is the nornal operating pressure on low side and on the high side for truee freezer using 404 refrigerant


I'll try to give you the "Readers Digest" version.
First, make sure there is no ice build up on the evap. Light frost is O.K. as long as it does not effect air flow. (Very Important). All fans need to be running. Again, an air flow thing. There should be some product in the box but not too close to the evap. Again, an air flow thing.
The expansion device can effect your pressures to some degree i.e. Cap tube vs. TXV.
As a general rule of thumb, which I use almost everyday when it comes to pressures:
Low side is based on the temp difference between evap temp and condition space in the box. In freezers, it is almost always 10 degrees. If the box is 0 degrees then the evap needs to be at a minus 10 degrees. That is a pressure for R-404A of 24.5 psi. This only holds true when the temp in the box is approching set temp. I would say, about +10 degrees. 0 Degrees for the evap for R-404A is 33.5 psi.
High side should be ambient temp +30 degrees and then convert to a pressure for the refrigerant.
Example: 75 degrees in the room, +30 degrees equals 105 degrees. Now 105 degrees converted to a R-404A pressure is 253 psi. This will get you very close to the desired high side pressure.
I would look at low side first to see if it is within reason. Don't let the high side get too high. Increases the compression ratio and overworks the compressor.
Your icing problem could be a defrost issue and not a refrigerant charge issue.

Good Luck and hope this gets you started.

Apr 07, 2009 | True 49 cu. ft. / 1388 liter Commercial...

2 Answers

Low suction pressure high head pressure


That system has a restriction. Most common at TXV valve or capillary tube. Will need to be replaced by Refrigeration company. In this video I replaced TXV valve and filter drier due to the same issue You have. Its Ice Machine, Low side was at 5 PSI, High at 250PSI : 404A; should be around 55-65 Low; 250 -275 High. Replaced drier and TXV, machine works proper.

May 19, 2008 | Hussmann Freezer 12 Facing Straight Glass...

Not finding what you are looking for?
Freezers Logo

Related Topics:

127 people viewed this question

Ask a Question

Usually answered in minutes!

Top Freezers Experts

Dennis Boxerman

Level 3 Expert

1218 Answers

Charles T Nevin
Charles T Nevin

Level 3 Expert

4070 Answers

John Tripp
John Tripp

Level 3 Expert

4654 Answers

Are you a Freezer Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...