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Unit is fully charged but suction line freezes

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  • Brian Niten May 14, 2010

    How do you know it's fully charged?

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Hi there,
this sympton persist in over charging of freon it is call super charge,exessive charging of freon resulted to freeze your suction line,this is bad for the cycling process.to reduces freon charging purge out exessive freon on low side charging port.make sure service charge pressure gauge valve was installed.to determine the exact operating pressure. have a nice day fix my rate,thanks a lot.

Posted on May 14, 2010

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Fridge/freezer not cooling but copper pipe near the compressor freezes up


If freon was needed at all, then your system must have a leak, it is never advised to add freon because of this. If your suction line is freezing up to the compressor shell, you are most likely over charged and the evaporator is flooded/saturated with freon and unable to cool/freeze properly. The freon should be added by weight or volume as noted on the model/serial sticker on the unit only, if the sticker is not present, than an experienced technician will need to charge by temperature/pressure using a set of gauges. Prior to charging, the system needs to be fully evacuated to ensure all non-condensables are removed from the system. Pleazer Appliance...

Apr 17, 2014 | Refrigerators

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Conair mini split heat pump isn't cooling but has cold suction line but warm liquid line and is not freezing up the evaporator. Thinking a sucking reversing valve?? What could cause that? Both evapor


Make sure that your refrigerant charge is good first. Reversing valve has 4 pipes coming off of it. The one alone is discharge and centre of 3 is suction always. The two sides are the reversing pipes. One side should be same temp as discharge and other same temp (+-5F) as suction. If not then you have bypassing refrigerant in valve. Bad.

Jul 13, 2013 | Heating & Cooling

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My goodman unit is freezing up. It is frozen from the line running out of my house than if u look down into unit, the freeze continues inside


Hello, the suction line will freeze either due to low airflow such as dirty air filter, blower wheel, evaporator coil or a weak blower motor. Also, a low refrigerant charge can cause the suction line to freeze up.

Jul 16, 2012 | Goodman Heating & Cooling

1 Answer

All the coils on the unit outside froze up


Hello, if the inside fan was not running then the evaporator coil cannot absorb enough heat to vaporize the refrigerant, and the suction line will freeze including the compressor. Liquid refrigerat instead of vapor passes thru the suction line into the compressor. Lack of airflow or a low refrigerant charge is what will cause the line to freeze. In your case it was no airflow

Jun 14, 2012 | Goodman Heating & Cooling

1 Answer

Ice on suction line


hello, usually the suction line will form ice when there is low airflow due to a dirty filter or plugged eveaporator coil, also if the unit is clean then it is possible that the unit is low on refrigerant charge due to a leak. Inwould also check the thermostat on the unit to make sure it is fuctioning properly, I have seen may units where the thermostat cause the compressor to run continously and cause the suction line to freeze.

Jun 14, 2011 | LG Electronic Window Air Conditioner

1 Answer

We just installed a new Goodman HVAC and the compressor lines freeze up. The technician that installed the unit cannot find the problem


Not to be critical, but not much of a technician if he cannot properly troubleshoot the issue.

Several issues can cause the freezing problems:

1. Refrigerant charge issue.
2. Improper equipment sizing.
3. Air flow issues.
4. Metering device issue.

First is under charge. But before making this determination several other things must be diagnosed and resolved.

Was the unit sized properly using a heat load calculation? You may not know what this means but a reputable, knowledgable contractor does. If the unit was oversized, it can cause the unit to freeze. If the indoor fan & motor were undersized. it may not be moving enough air across the coil and this will cause the coil & suction line to freeze.

Air flow issues, such as obstructions in your ducting or across your evaporator coil will cause the coil to freeze, thusly your suction line will freeze as well. Is the filter and evaporator coil clean? Are there any obstructions in the air passages (duct)? Is the duct work sized properly. Improper sizing of the duct work may choke down the required return air flow, and cause the coil to freeze.

The last issue could be a problem with the metering device. If it is an adjustable thermostatic metering device, was it setup to maintain a 12 degree suction superheat? If it is a fixed metering device, such as a cap tube device or bullet (orifice) device, it mat have a restriction (ususally a piece of solder or flakes from the soldering process clogging up the inlet screen). To easily check this, thaw the system out, start it back up when thawed and look for frosting or ice accumulation at the metering device outlet side. I fit does this rather quickly, then the system must have the refrigerant recovered (or pumped down into the condenser) and the blockage removed.

If it is air related, this must be fixed prior to properly trying to charge a system. Unless the proper airflow has been established, charging the system, or checking charge cannot be properly performed.

Sep 03, 2010 | Goodman Heating & Cooling

1 Answer

When i was fixed a problem in central ac trane i found decreased in freon r22 and the suctione line was freezed, i charged the ac with froen gas r 22 then i found that the suctione line changed and begin...


You are still low on freon. Charging AC by superheat and subcool
First charging a unit by superheat, this is only for Acs with an orifice or capillary tube.
Optimum superheat is 12° to 15° at the compressor or suction line outside the unit.
Hook up your gages and put a thermometer on suction line (large line), start the AC. Measure the temperature of the suction line and read the pressure on your gages. Theres a temperature scale on your gages for R-22 or R-410A the needle will show you the pressure on the outer scale and if you follow it down to the R-22 or R-410a inner scale that is the saturation temperature for that refrigerant, (you can also use a temperature pressure chart), now read the thermometer, let’s say the suction temperature( the thermometer) is 67° and the saturation temperature (the gages or temp. press. Chart), is 55°, subtract the saturation temperature from the suction temperature, 67°- 55° = 12° superheat.
Charging by Subcooling, this is for Acs with a thermostatic expansion valve, it’s common to see a sight glass on the liquid line (on these units with a sight glass just clear it, when, indoor room is at approximate set point of the thermostat). Optimum sub cooling is 12° to 15° at the outdoor unit.
Hook up your gages and put a thermometer on liquid line (small line), start the AC. Measure the temperature of the liquid line and read the pressure on your gages. Theres a temperature scale on your gages for R-22 or R-410A the needle will show you the pressure on the outer scale and if you follow it down to the R-22 or R-410a inner scale that is the saturation temperature for that refrigerant,(you can also use a temperature pressure chart), now read the thermometer, let’s say the liquid temperature( the thermometer) is 100° and the saturation temperature (the gages or temp. press. Chart), is 114°, subtract the liquid temperature from the saturation temperature, 114°- 100° = 14° subcool.

Oct 05, 2009 | Heating & Cooling

1 Answer

Freezer has lost its suction & no longer freezing!


Depending on the age of the unit it does take a 134a freon charge or 12 or 22. when fully charged unit should cool properly. need to check door seal for suction issue. the unit does need a good charge to cool. it could also be a restricted sealed system issue.

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