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What is the cap tube size and length for a McCall freezer model 7-7045FT; R 404A?

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Sea Breeze
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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

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SOURCE: NEED TO KNOW SIZE OF CAP TUBE FOR A MODEL 3 F

call e-mail the manufacture if you can get the oem parts for the cap tube size I'd need the horse power of the compressor.

Posted on Jun 17, 2009

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SOURCE: Delfield 6000xl: what is the 404a freon charge?

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

Posted on Apr 01, 2010

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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.

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Specs of tev for mccall freezer


you need model number and serial number . refrigerant type and possibly the compressor model number to determine the txv type and capacity

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What is the normal operational pressure in lo/hi side at the compressor of commercial freezer like dispaly case, reach in cabinet or other any low temp refrigeration uses 502 or408A/404a. is there any rule...


why yes there is. Generally speaking, the head pressure should be around the "ambient +30" rule.
That is, measure the entering air temp to the condenser, say 75 degrees. Now add 30 to that and get 105 degrees. Look at a P/T chart and see what the pressure is for that temp which is about 253 for R-404-A.
The evap on a freezer leads the load so, as a general rule, the evap temp is going to be around minus 10 degrees to get a 0 degree box. Coolers are different. So, the pressure for a minus 10 evap is around 25 or so. But the unit has to be close to operating temp. If the box is warm, naturally the pressure is higher. And what influences the pressure is whether or not it's a TXV or a cap tube system.
If a TXV and no receiver, charge by subcooling. If a receiver, fill by sight glass. If Cap tube, charge by superheat.
Hope that answers your question.

Oct 03, 2010 | True 49 cu. ft. / 1388 liter Commercial...

1 Answer

McCall freezer installed 8 yrs ago in remote area 90 miles from nearest tech. Compressor was remoted to basement. Freezer has never cooled to less than 10F--in red arc. Now won't cool less than 30F. ...


If the condenser coil is clean and the unit is in an area where the ambient temp. is 80 degrees or less, it is most likely a refrigerant problem. Probably low and has a leak. Another issue could be that the line sizes for the distance the refrigerant has to travel, may be wrong. Since I don't know the distance, you may need to have that checked into also. You should not have more than a 1-2 psi drop due to line size and distance traveled.

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1 Answer

Delfield 6000xl: what is the 404a freon charge?


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

Mar 25, 2010 | Freezers

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

1 Answer

NEED TO KNOW SIZE OF CAP TUBE FOR A MODEL 3 F


call e-mail the manufacture if you can get the oem parts for the cap tube size I'd need the horse power of the compressor.

Jun 13, 2009 | Continental Freezer Wide...

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...

1 Answer

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

Nov 01, 2007 | Freezers

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