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Head pressure is at 220 ambient temp is at 110.inside emp is 85 and low side is around 50 cleaned all coils and filters but still have the problem

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  • Robert May 25, 2011

    What is the temp differance between return air and supply air?

  • Robert May 25, 2011

    Is this a fixed orifice or txv system.? I need to know the superheat and suncooling.

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This will help, Tim:

http://www.air-conditioning-and-refrigeration-guide.com/air-conditioning-troubleshooting.html

Posted on May 25, 2011

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Charging an air conditioning system


R22 systems should run a 68# to 70# suction pressue. If you look at the suction guage at 68# that is a 40 deg evaporator coil temp.

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Above 78F no longer works gives heat head pressure is 300 and slightly above while low side varies bet 45 and 55 psi,noise in the return. i have about 85 feet of coil run 3/8 high side and 3/4 return from...


Your head pressure is a little high, depending on the ambient temp and your suction pressure is a little low. The suction pressure should be around 68 psig, the equivalent of a 40 degree coil. You can try adding a little refrigerant, check your compressor amp draw. If head pressure keeps going up and suction doesn't come up you may have a restricted metering device or filter dryer

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I am working on a M # GPG13420901AB. This is a 3.5 ton package unit that replaced a 3 ton package unit on 1700sq/ft single level home. Old unit was working fine but was replaced when the home was...


It sounds like you are low on charge. I think you have a thermostatic expansion valve and you need to check the subcooling, you should have 12 to 15 degrees at 95. At 95 degrees your head should be about 280# for a 12 or 13 SEER unit or higher depending on the effeciency. At 78 to 80 degrees indoor depending on the humidity, that is normal. The valve will open to try to fully feed your indoor coil and it sounds like your head pressure is to low to force enough refrigerant thru the coil.

Aug 16, 2010 | Goodman Heating & Cooling

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What is the a/c charging pressure on roof top r/v units?


The easiest way to charge a unit is to add freon to the low side until the line sweats and the coil is sweating top to bottom. The pressure depends on the wet bulb temp on the low side line the ambient temp outside and the intake temp inside the
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Aug 11, 2010 | Dometic Rooftop RV Air Conditioner

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Low charge?


System is running a 24°F superheat and a 0°F subcooling at those readings. Saturation temperature is approx. 30°F lower than return air temperature.

Indications are of a low system charge. Ensure all your filters are clean and there are no obstructions that are limited airflow across the evaporator coil. Ensure the coils are clean and not frozen up.

Have it checked out. Looks like a low charge but can't tell without being in front of it. As far as normal ranges, that all depends on many factors. Based upon the info you have supplied, I would guesstimate that the operating pressures would be in the neighborhood of 350/160 to start and get the subcooling and superheat in check.

Jul 31, 2010 | Weather King 12AJA3601AH Air Conditioner

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Ac won't go down past 78 F while operating the presures are 15/ 150 psi. I think it needs charge. But how much charge what pressure does the low side need to be at?


The temperature outside and pressure chart are needed to accurately determine the proper charge. (temperature pressure charts to calculate heat gain) However the low side of the unit should read around 70 and the high around 210. This is a really broad generalization and I do not recommend you charge your unit just on this info. It will get you close if you are using R-22 and the unit is properly cleaned. A dirty evaporator coil will cause a severe low pressure reading on the low pressure side.

Jun 28, 2010 | Carrier 38CKC036 Air Conditioner

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What happens when the pipe freezes?


low freon charge or your inside evap coils are dirty,,,check yourevap filter and replace if its dirty..also check your evaporater coils to see if its dirty,,,,,,,if its dirty you will need to flush and clean it...with coil cleaner and water......if all is clean and evap has good air flow..........your freon charge might be low......check your pressures hi and low.........hi side should be around 220 to 250 psi and low side should be 68 to 74 depends on the outdoor temp and indoor temps............have a certified hvac tech check the pressures.............

high side line is the small copper line
low side line is the bigger copper line............

a feedback would be good if this helps anyone...

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2 Answers

Indoor unit temperature between 60F & 70F after R22 charge..


The pressure changes with temperature, it is not a true gauge to ensure a proper charge.

You should have a 15 to 20 degree temp drop across the evap coil. (return air vs supply air)

Can you verify that the compressor is running?
Not the condenser, but the compressor located inside the condenser (outdoor unit)

it really sounds like it is still undercharged.
Check the temp drop, let me know what it is.
Also tell me what the outdoor ambient temp is.

( for example.... 98 degree outdoors with 85 degree indoor temp could result in pressures something like 325 on the high side and 75 or 80 on the low side.
With the exact same unit, but 80 degree outdoor temp combined with 70 degree indoor temp, your pressures could read 215 low side and 55 low side. Not to mention that more efficient units often have higher pressures on the low side because they have more coil space and remove heat more efficiently)

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13 degree Delta T


I assume r-22 refrigerant by the pressure... you have a saturate temperature of approximately 41 degree and 71 degrees at the service port this equates to a 30 degree superheat. a condenser saturation temperature of 105 degrees and since the liquid line temp at the service valve is not given only the enterin indoor coil on the liquid line a 96 degree temperature this would equate to a subcooling temperatureof about nine degrees. You have too high of a superheat reading. verify that the bulb for the txv is correctly positioned and insulated. if it is then you need to remove the bulb from the suction line, hold it in your hand to warm it up and see if the superheat changes. you could also have issues with your ductwork. If the supply temperture is around 50-55 degrees then the unit is doing all it can.. Check the txv and the ductwork as the subcooling indicates that the condenser side is doing it's job, but the superheat readings indicate that you are starving the evaporator..

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1 Answer

Possible restricted drier


Before you start checking pressures, you need to make sure that the unit is clean inside and out. You also need to know what the ambient temp is outside so you know what the pressures should read. Without this information, your info is useless to me. You need to know what your saturation temp is to determine if the head pressure is too high or too low. If the outside unit is dirty, you will have a high head pressure and low suction pressure. If the inside is dirty, you will have a high suction and a normal to low head. My advice to you is to clean first and then start checking temps and pressures. Otherwise you are spinning your wheels.

Mar 31, 2009 | Heating & Cooling

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