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Posted on Jul 10, 2012
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What is the working pressure of R410a low and high pressure

My air cond. make Trane is working on 85 psig in an ambient temp. of 29 degrees and the efficiency of both compressor and evaporator is not to the max.

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5 Related Answers

Anonymous

  • 334 Answers
  • Posted on Aug 02, 2009

SOURCE: I just installed a GSC140421 using a coil CAPF

hey there, the matching coil for your unit is a Model# CAPF4860C6A. The coil you have installed is a 13 seer where the condenser is a 14 seer. Myy guess at this point without being there is you have a hot house (80 psi suction) while eliminating more heat from the condenser (180 psi). I am also guessing you are using r-22? If you could post your super heat and subcool readings and if ou have a txv or fixed orifice (guessing txv?) I could help you pinpoint the problem.
seth

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Anonymous

  • 301 Answers
  • Posted on Nov 01, 2009

SOURCE: Normal in cool cycle, very high pressure in heat cycle

Expansion valve on the condensor or possibly overcharged with refrigerant?

Anonymous

  • 478 Answers
  • Posted on Jul 08, 2010

SOURCE: My heatpump keeps running, but only drops

You have a low refrigerant charge. Your low reading which coresponds to the temp at the coil 49psi is about 20 degrees fr. It should be closer to 70 psi depending on the ambient temp indoors. The coil has to be above freezing I usually shoot for 38 to 40. your sub cooling needs to be at least ten. And if you cant feel the heat leaving throuhg the condenser fan it aint moving it.

Bill Long

  • 606 Answers
  • Posted on Aug 18, 2010

SOURCE: I am working on a

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.

Robert

  • 1036 Answers
  • Posted on May 11, 2011

SOURCE: temp off air coming out

Hello, what is your high side pressure? A bad compressor will show abnormally high low side pressure with abnormally low high side pressure. That 45 low side pressure is low And superheat high. If you high side pressure is normal toma little above normal but the low side remains low you have a restriction in the system, that might be why it's not taking in tne freon. Let me know you high side pressure

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0helpful
1answer

Low to zero pressure on low side test port
150 is low for high side pressure. may have to add more r-22 to system. if you had a blockage high side pressure should be higher. have you turned both service valves at condensor ccw completely?
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Apr 20, 2014 • Goodman CKL42AR42 Air Conditioner
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1answer

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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Jul 17, 2011 • Goodman Heating & Cooling
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1answer

What is the high pressure and low pressure reading for a standard R410a air conditioning equipment?
outdoor ambient temp + 30 deg F convert to pressure via chart;
indoor ambient-40deg F converted to pressure via same chart.
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Nov 01, 2010 • Heating & Cooling
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1answer

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.
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Aug 16, 2010 • Goodman Heating & Cooling
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The unit constantly freezes up. Suction is at 85, liquid is at 285, suction line temp is 52. Ambient 85, while inside is at 85-88. Only 1-2 degrees of superheat. Taking refrigerant out lowers line temp...
Has anyone added refrigerant? If there was a blockage I would think the suction pressure would be lower. Are you sure it isn't just overcharged. If you take the ambient and add 20F that would give you a condensing temperature of 105 which gives you a pressure of about 210# on the high side and something to shoot for. I don't know if this helps you. Also, the numbers I listed are for R22. You didn't mention what type is in the unit.
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Aug 10, 2010 • Intertherm P3RA-030K Air Conditioner
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2answers

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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Aug 21, 2009 • Sanyo Split System Air Conditioner
3helpful
2answers

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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Jul 28, 2009 • Heating & Cooling
11helpful
3answers

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
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Jul 11, 2009 • True 49 cu. ft. / 1388 liter Commercial...
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1answer

I am looking for the service manual for fujitsu 12rlq unit.
Low side pressure will be about 130 psig.
High side will be about 418 psig.
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Apr 08, 2009 • Fujitsu 18C1 Air Conditioner
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1answer

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.
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Mar 31, 2009 • Heating & Cooling
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Low to zero pressure on low side test port

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