McCall Freezer 7-7045FT Logo

Related Topics:

Posted on Oct 17, 2009
Answered by a Fixya Expert

Trustworthy Expert Solutions

At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.

View Our Top Experts

Compressor failed replaced the entire condensing unit charged with 24 oz of 404A per name plate pressures not right added 404A till I got 9,5 suction and 260 head temp of freezer was 40F this morning it was 50F need to know suprtheat and normal operation pressures this is a cap tube system

Answer This Question
  • 1 more comment 
  • toolman001 Oct 17, 2009

    This afternoon the unit only pulled down to 20F head was down as well as suction. Iadded some 404A and got the head to 270 and suction to 10 still need superheat on this unit.

  • toolman001 Oct 17, 2009

    More info no burnout, dryer changed, vacuum for 1hour unit warm pulled to 167microns and held
    new 404A charged liquid

  • toolman001 Oct 18, 2009

    As stated this was not a burn out 404A has to be charged as a liquid and flashed to a vapor and yes at 25 psiga 404a is at -10 F however to take in consideration the delta T of the evaporator the suction would be lower. My question is and has been from the very start what is the design superheat of this system and what are normal suction pressures?
    I am beginning to feel as if your web site is not so good

×

3 Answers

christian nielsen

Level 3:

An expert who has achieved level 3 by getting 1000 points
All-Star:

An expert that got 10 achievements.
MVP:

An expert that got 5 achievements.
Vice President:

An expert whose answer got voted for 100 times.

  • Master 358 Answers
  • Posted on Oct 18, 2009
christian nielsen
Master
Level 3:

An expert who has achieved level 3 by getting 1000 points
All-Star:

An expert that got 10 achievements.
MVP:

An expert that got 5 achievements.
Vice President:

An expert whose answer got voted for 100 times.

Joined: Mar 20, 2009
Answers
358
Questions
0
Helped
138685
Points
1047

When replacing a condensing unit , also must replace the dryer and vaccum the system for about 45 minutes and after that recharge it with scale for the right amount of freon written on the tag in the freezer .The normal operation pressures are between 50 to 60 psi for the suction side and about 350 no more than 375 psi for the high side.To calculate the superheat: suction line temp - evaporator temp= superheat.

Anonymous

Level 3:

An expert who has achieved level 3 by getting 1000 points
All-Star:

An expert that got 10 achievements.
MVP:

An expert that got 5 achievements.
Vice President:

An expert whose answer got voted for 100 times.

  • Master 788 Answers
  • Posted on Oct 17, 2009
Anonymous
Master
Level 3:

An expert who has achieved level 3 by getting 1000 points
All-Star:

An expert that got 10 achievements.
MVP:

An expert that got 5 achievements.
Vice President:

An expert whose answer got voted for 100 times.

Joined: Jun 10, 2009
Answers
788
Questions
0
Helped
253827
Points
2355

I have reviewed your problem and it seems to me, that your head pressure is a little to high as well as your suction side pressure being too low.
It may be that your system has not settled down and or may be overcharged or could be due to a restriction in the cap tube.
I'm sure that you pulled a long vacuum on the unit and dryers has been replaced.
If the unit has had a burnout, did you flush the system or just vacuum..
Hope this information has been of some help.
Please rate....
P.S. you know, it could just be that the oil has not completely settled, but should with system running for a few hours.

  • Anonymous Oct 18, 2009

    Well, OK.

    Here is where your mistake was.

    1. If the compressor failure was a burnout, you should have flushed out the system before running a 1 hour vacuum.

    2. One hour would be OK for a regular change out but once the oil brakes down, it becomes contaminated and as you know the oil is the hardest to remove.

    3. I would never charge a system liquid, unless of course you were using a metering canister to inject the refrigerant.

    I have always gone by the label when it comes to the charge and for my applications, I always flushed my systems with 502, after a burnout.

    Sound like it may be one of those that just has to settle down.

×

Ad

Anonymous

Level 3:

An expert who has achieved level 3 by getting 1000 points
All-Star:

An expert that got 10 achievements.
MVP:

An expert that got 5 achievements.
Vice President:

An expert whose answer got voted for 100 times.

  • Master 612 Answers
  • Posted on Oct 18, 2009
Anonymous
Master
Level 3:

An expert who has achieved level 3 by getting 1000 points
All-Star:

An expert that got 10 achievements.
MVP:

An expert that got 5 achievements.
Vice President:

An expert whose answer got voted for 100 times.

Joined: Aug 15, 2009
Answers
612
Questions
1
Helped
163552
Points
1827

You suction pressure should be right at 25 lbs for the temp of -10 degrees.

  • Anonymous Oct 18, 2009

    Your suction pressure should be 25 lbs. and your superheat should be around 18 degrees and your supercool should be around 8 degrees. Sorry about leaving the superheat off last night, I had to leave on an emergency service call. Good luck.

×

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

0helpful
1answer

Flex ice Machin 404a gas ..how much suction and discharge pressure should be..?
The ideal suction and discharge pressures for a Flex Ice Machine using 404a refrigerant can vary depending on several factors, including the ambient temperature and the load on the machine. However, here are some general guidelines: Suction pressure: The suction pressure should typically be in the range of 30-45 psi (pounds per square inch) for a 404a refrigerant system. This pressure corresponds to a saturation temperature of around 20-30°F (-6.7 to -1.1°C). Discharge pressure: The discharge pressure should typically be in the range of 225-250 psi. This pressure corresponds to a saturation temperature of around 100-110°F (37.8 to 43.3°C). It's important to note that these are general guidelines, and the ideal pressures can vary based on the specific conditions of the system. It's also important to ensure that the pressures are within the manufacturer's recommended range, as pressures that are too high or too low can indicate a problem with the system. If you are experiencing issues with your Flex Ice Machine, it's recommended to consult a qualified technician for assistance.
Read full answer
Feb 24, 2023 • Freezers
0helpful
1answer

What should the refrigerant pressures be on a reach in freezer that uses 404A refrigerant
Generally, low side is around 20-25 PSI and High side is about 235-250 when unit is close to operating temp. Expansion device effects this to some degree such as a cap tube can restrict and affect pressures as well as the amount of the charge in the system. Compressor efficiency is another.
Read full answer
Jan 19, 2018 • Freezers
0helpful
1answer

I've got a walk in freezer unit on board ship that's not reaching set point. Its a 404A system and I haven't worked with that refrigerant. The compressor/condenser is in the E/R where its 110? F.
It sounds like its doing good.
Read full answer
Sep 02, 2017 • Freezers
0helpful
1answer

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.
Read full answer
Sep 15, 2014 • Delfield Freezers
0helpful
1answer

Continental Freezer model F2 404A refrigerant not cooling properly. Replaced cap tube, and filter drier, evacuated, and charged. Box temp not going below 32' and ice forming at beginning of evaporator....
Check the compressor efficiency. See if it will pump down. In most cases, a good compressor will pull down to about 15" vacuum. Also, be sure that the refrigerant amount was weighed in and not done by pressures only.
Read full answer
May 18, 2017 • Continental Freezer Wide...
0helpful
2answers

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.
Read full answer
Jun 28, 2017 • Hoshizaki Freezer Commercial Ice Machines...
0helpful
1answer

Lo side 7 hi side 225 compressor replacement was 502 now 404a , cro valve replaced,drier replaced system flushed with rx11. System appears to be operating good brings unit down to -15 . amp draw 7.2...
Did you replace or add a filter drier at compressor replacement? It may have a partial blockage at the inlet to the evaporator.
Read full answer
Oct 30, 2017 • True 49 cu. ft. / 1388 liter Commercial...
1helpful
1answer

Model km-250baf hoshizaki with weighed in correct amount of 404a the head preasure risies to over 400 psi i think it is the txv advise me if i am right
There are a lot of variables that cause high head pressure. Be sure the cool ing fan is operating properly. It should come on whenever the condenser coil feels warm to the touch. It will cycle on and off as the pressures change. A clogged up coil will also cause high head pressure. If you don't have sufficient water flowing over the evaporator plate, where the ice freezes, the head pressure will go up. You need to check the low side head pressure as well. Weighing the charge is a good start to charging the machine , but the first question I would ask is why are you charging it? Was there a leak, or compressor change?
If you had a compressor burnout, did you replace tthe drier-filter?If not, it may be stopped up from burnout residue. That will also cause high head pressure. If you did not vacuum the system there may have been refrigerant still in the system before you started the new charge. Check the items I mentioned and see if that helps.
Read full answer
Sep 04, 2010 • Hoshizaki Freezer Commercial Ice Machines...
0helpful
1answer

I replaced compressor for a hussman refrig and its hums loud
God day,
Some thoughts.
1. Are the evap fan motors running, and at full speed. That would give you abnormally low suction pressure.
2. Cap tube sized too small. or partial restriction in the dryer cap tube/dryer when brazing in the lines.
3. Low ambient. What's the temp the machine is running in.
4. Over sized compressor.
5. Moisture. God, 134A is touchy on that one.
6. Was original cap tube soldered to the suction line to create a heat exchanger. Needed on many apps. Definately would cause flash back on start up.
7. Superheat a little low, should be 12 to 15 degrees.
Read full answer
Jan 31, 2010 • Hussmann Freezer Gelato Pan Rack (For 12...
1helpful
1answer

Errattic temperatures in Freezer
Check out "victory-refrig.com" for manuals, diagrams, etc.
Cap tube systems are "critical charge systems". Can be difficult to get right. You did not mention pressures that you had. The split on the evap vs.box temp is almost always 10 degrees for freezers. If you want a -10 box, your evap needs to be -20. As a general rule of thumb, you want the high side to be "ambient +30". This seems to work most every time. Your problem might be operations related. Them leaving the door open alot and so on. It could also be a problem with the evap fan or the control to it. It could also be that since there had been a problem with the unit, they are now constantly checking it. Could be checking during a defrost cycle. When your box is at 0 degrees, your pressure should be about a -10 and no less that a -15 degree for the evap. You may have to babysit this thing and see how far it will pull down. You may have a weak compressor. Also, I have had many Hobart freezers fail due to dirty condensers. This causes the oil in cap tube systems to gel and clog up the cap tubes. The only fix is replacing the cap tube. There are alot of variables here so be patient, it's not going to be a quick fix. One last thing, since R404A can fractionate, you really need to pull the charge out and weigh in the correct charge with virgin refrigerant. This will eliminate 2 things. 1, it will ensure the correct amount of refrigerant and, 2 no chance of having a poor mixture of refrigerant in the system causing inconsistant readings and performance.
Hope this helps. And remember, cap tube systems are performance measured by the amount of superheat just prior to the unit making temp and cutting off.
Read full answer
Jan 07, 2009 • Victory Commercial Freezer VSF-3
Not finding what you are looking for?

View Most Popular

Freezer 7-7045FT

  • Freezers

Related Question

Flex ice Machin 404a gas ..how much suction and discharge pressure should be..?

  • Freezers

263 views

Ask a Question

Usually answered in minutes!

Popular Questions

Freezer will not pull down. sometimes does for a

McCall Freezer 7-7045FT

Can not get temp. below +10 f

McCall Freezer 7-7045FT

Need to know the design

McCall Freezer 7-7045FT

I need compressor for Mcalls

McCall Freezer 7-7045FT

Condensor freezes up and freezer doesn't keep things frozen

McCall Freezer 7-7045FT

Top McCall Freezers Experts

Brad Brown

Level 3 Expert

19187 Answers

ADMIN Andrew
ADMIN Andrew

Level 3 Expert

66835 Answers

ADMIN Eric
ADMIN Eric

Level 3 Expert

39363 Answers

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

Answer questions

Manuals & User Guides

Loading...