Question about Heating & Cooling

# 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 to melt the ice so a few minutes and the suctione became not cold and there wasnt enough cold air in the room and the low pressure gage increased 10 bar psi so what is that.?????????

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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.

Posted on Oct 06, 2009

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## Related Questions:

### What type of refrigerant should be used in a Mitsubishi ms09tw 2001 air conditioner?

The answer is R410A.

Refrigerant Types in a Central Air Conditioner
There are 2 different types of air conditioning refrigerant currently used in residential cooling systems. R-22, commonly referred to a Freon and R410A, a blend considered to be more environmentally friendly, sometimes called Puron.

R410A (sometimes known as Puron), is the industry's choice to replace R-22 in central air conditioning systems. It is less reactive with the environment while having the same home cooling characteristics of R-22. R410A is not interchangeable with R-22-you choose one or the other and your air cooling equipment is designed to operate with it. When you purchase a R-410A system, a new line set is included with your central air installation as well as a new evaporator coil. Our experience with R-410A has been excellent. New cooling systems have been dependable and efficient, as well as operating quieter! R-410A is the refrigerant of the future!

Less reactive with the environment
Replaces R-22 in the year 2020
Cannot be used with R-22 systems
Quiet and dependable
Freon, R22, heat pump refrigerant
R-22 also known as Freon has been used for decades as the refrigerant in central air conditioning systems. However it has been linked to Ozone depletion and has therefore been banned from being manufactured after the year 2010. It's price will increase as the supply decreases.

Good luck,

Marty

May 27, 2014 | Mitsubishi MSH09TW Air Conditioner

### Voltas 5.5tr pacage ac suction line and compressor make ice, what can i do

CHECK FREON PRESSURE, COULD BE LOW, THAT WELL CAUSE LOW SIDE LINE TO FREEZE IF LOW, DO NOT OVER CHARGE SYSTEM.

Feb 21, 2013 | Heating & Cooling

### AIR CONDITIONER IS NOT COOLING, USING GAGUE, FOUND BOTH SUCTION AND DISHCHARGE PRESSURE VERY LOW. IT IS R22 4 TONS AC UNIT, SUCTION 10 PSI, DICHARGE 80 PSI. COMPRESSOR AND FAN RUNNING.

there is probably a leak in the systems somewhere, it needs to be inspected for a leak and charged with R-22 for proper cooling.
There is a stop leak for air conditioning systems available to licensed technicians to buy, might work if the leak is very small.

Aug 22, 2011 | Heating & Cooling

### This is a 3 1/2 Ton unit that is low on R22 but still does cool enough to freeze up. The A/C tech insists that it needs over 4lbs of freon, does this seem right to you?

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Aug 03, 2010 | Heating & Cooling

### How do you connect a/c charger to make your central air cooler

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### Unit is fully charged but suction line freezes

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.

May 14, 2010 | Heating & Cooling

### When charging central air unit r-22......

It sounds like you have your gages hooked up wrong. Blue goes to the Suction line (the big line) it should be cold when the units running.
Red goes to the liquid line (the little line).

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### Adding freon to my central air

Well duprees, first you got to have the right instrumentation for charge freon to a a/c system, now, the charge line is the thick line, wich it means the suction line, the colder line, or the most robust line on the compressor.
Then, the system uses freon 22, the right charge, with the system on and the compressor running is 68.5 to 70 psi.
This should give to you about 40 degrees(farenheit) at the evaporator, the panel that gets cold in the system.
This pressure should be at the low side, meaning thicker line in the compressor unit.

Good luck.......

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