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R404a operating pressures

What is the high and low pressure for a commercial ice maker machine

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Posted on Jan 02, 2017

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refritech08
  • 149 Answers

SOURCE: ice cube cycle time very high

i suspect a defective liquid line or pump down seleonid coil. just make sure you hear the "click" when it starts up if not the selenoid coils could be defective. also verify that the condenser fan is running,because if not you are short-cycling on high head pressure. please contact if you need any additional info

Posted on Jun 13, 2008

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  • 1 Answer

SOURCE: low suction pressure high head pressure

i have a high pressure on the high side, but no pressure on the low side, when i test my freezer, any ideas, thanks

Posted on Oct 02, 2008

  • 1151 Answers

SOURCE: evaporator unit keeps on building ice. question

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.

Posted on Apr 08, 2009

  • 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

  • 1 Answer

SOURCE: Normal Operating pressure for true 2 door Freezer

the proper operational pressure on the high side is 450 psig and on low is 200 psig for R-404A

Posted on Feb 14, 2010

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1 Answer

What is hgv valve leaking by


The hot gas valve is activated during the machines harvest cycle letting hot gas defrost the evporator. If it is "leaking by " that means that it is not fully closing during the freeze cycle causing high suction pressures and inefficient operation of the machine. And maximum freeze cycles. If that is happening it will need to be replaced by a qualified technician.

May 09, 2014 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Ice Makers


It should have a regulating valve to help control the head pressure. It is adjustable to maintain a constant head pressure. The higher the pressure, the more the water should flow to keep the pressure down. Since there is not model number, I can not suggest an exact setting.

Sep 06, 2012 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

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.

Sep 04, 2010 | Hoshizaki Freezer Commercial Ice Machines...

2 Answers

Ice machine is only making flakey size ice. Machine is clean and filters have been changed. Water is flowing and cold; it appears that the machine is in constant operation.


sounds like there is a problem with the water in the sump escaping. Sometimes, the plastic grate under the evap plates break and pieces get stuck in the dump valve. It is a triangular piece that the pump attaches to via a hose. It is spring loaded and the pieces prevent it from seating, thus, water leaks into the drain that you will not notice. When the water level in the sump gets low enough, it goes into a harvest and drops small slivers of ice. I'd check that out first.
Hope this helps.

Feb 09, 2010 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

3 beeps when in failure. makes ice for several hrs some times. compresser heat extreme. this unit is water cooled but h2o out put seams to low what should out put flow be?


First, 3 beeps means that the unit was in the freeze cycle too long and the 60 minutes back up timer kicked in and took over.
Now, for the water flow/ head pressure water cooled control.
You set the water flow for what ever it takes to achieve a head (High Side) pressure of 270 psi. the gallons per minute are of no matter. It's the pressure that you want to achieve and maintain.
If you fix the head pressure problem, the beeps should go away.
If you don't have a gage set, then measure the temp of the exiting water from the condenser. It should be in the 104 to 115 degree range. Any lower or higher, and the unit will not run like it was designed to do.
Hope this knocks it out for you.

Oct 23, 2009 | Hoshizaki Freezer Commercial Ice Machines...

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...

1 Answer

Ice cube cycle time very high


i suspect a defective liquid line or pump down seleonid coil. just make sure you hear the "click" when it starts up if not the selenoid coils could be defective. also verify that the condenser fan is running,because if not you are short-cycling on high head pressure. please contact if you need any additional info

Jun 11, 2008 | Hoshizaki Commercial Freezer KM-500MAH

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...

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