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How to charge 410a refrigerance by using manifold gauges what presure do I expect to see

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Anywhere from 5 to 10 PSI. Charge the machine and look for frost line coming back to compressor. Overcharge will be evident when the frostline is out of the coil and down the back side to the compressor. Recover (remove) refrigerant until the frost line goes back out of site.

Posted on Oct 13, 2010

  • Charlie Howe
    Charlie Howe Oct 13, 2010

    Oh sorry, I gave you the wrong info. I gave you instructions for charging a regrigerator with R134.

    For an airconditioner, you need to charge by superheat and subcooling.

    For a 40 degree coil on an A/C, you should have around 115 psi on the low side. But the high side should be according to your ambient temperature. There again, it is best to call someone to help you with it as the newer 410 units are a new breed and it may be difficult to charge correctly without doing the superheat calculation.


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How do you put in 410a into Ac unit

You turn system on to cool setting and run temp down until outside unit comes on. Then you connect your suction side of your gauges to the suction side of your outdoor unit. Next you connect the liquid(high)side of your gauges to the liquid line on your outside unit(the little copper line). Connect the middle hose of your gauges to the 410a drum of refrigerant. Before opening the suction or low pressure side of the gauges you need to turn the drum upside down and turn drum of 410a on. Then you need a temp reading meter and clamp to read the temp of your liquid line(small line). While charging you want to make sure to release refrigerant slowly. The unit should call for a specified subcooling on unit plate. 7 to 10 degrees. You take the liquid line temp and subtract it from saturation temp on the high side of your gauges.(it'll be the pink numbers on the right side of your gauge.

Jun 05, 2013 | Heating & Cooling


R-410A or r410a Why This Refrigerant is Better

One of the best benefits of R-410A refrigerant is its exceptionally quiet operation. Other key benefits of R-410A and the air conditioning systems that use it are higher EER (Energy Efficiency Ratio) better heat-pump performance, increased efficiency and reliability. There is also no ozone-depleting chemicals. R410A has the lowest Global Warming TEWI (Total Equivalent Warming Impact). Probably the most important benefit of R-410A is that it will still be available long after the production of R-22 units is stopped in 2010. Although contractors are still using the lower pricing of R-22 equipment as a selling point when talking to their customers, many smart ones are now also selling the environmental benefits of R-410A.They are also selling the benefits of the new technology and the improved comfort level of the new R-410A equipment.

There are many efficiency and economical benefits to R-410A. It has become very important for techs to inform their customers of the many benefits of R-410A products. Some of the benefits of R-410A are low energy consumption, increased product performance, no ozone depleting chemicals (no chlorine), and improved product reliability. The new products that use R-410A are state of the art technology, feature enhanced heat pump and air conditioning performance and meet the clean air act requirements for 2010.

For many years most air conditioners and heat pumps sold around the world used a refrigerant called R-22. Homeowners and business owners now have the ability to ask for an air conditioner or heat pump that uses the more efficient and environmentally friendlier refrigerant called R-410A. When you buy a new air conditioning or heat pump system by selecting R-410A you virtually eliminate the possibility that refrigerant leaking from your system could contribute to the hole in the ozone layer. You will also be investing in a new comfort system that will last you for many years to come. This is because R-410A (a chlorine-free refrigerant) complies with governmental legislation to phase out ozone-depleting refrigerants well ahead of the 2010 deadline. Another thing to consider is that the costs of R-22 will begin to rapidly rise when the production of R-22 units are phased out by January 1, 2010. Because of this there will be less R-22 refrigerant produced.

One of the greatest benefits of R-410A is that it will still be available for a long after the production of R-22 units ceases in 2010. If you are installing an air conditioner or heat pump in the near future, make sure that you specify that the unit uses R-410A refrigerant.
Do not allow the installation of a R-22 unit even if the pricing is much lower. The future costs of a repair to the unit will more than offset the savings now.

on Jan 10, 2010 | Heating & Cooling


R-410A The New Refrigerant for Air Conditioning

R-410A possesses excellent cooling capacity and operates at 50% higher pressure. R-410A is a mixture (blend) of refrigerants that create properties nearly identical to R-22, but are free of ozone depleting chlorine molecules. R-410A was developed in response to an agreement between numerous countries (known as the Montreal Protocol). That stated that those countries would move toward discontinuing the use of hydrochloro-fluorocarbon (HCFC)-based refrigerants. R-410A, chemically known as an HFC (hydrofluorocarbon), contains no chlorine and will not damage the ozone layer.

R-410A is an azeotrope mixture of R-32 and R-125. R-410A cannot be used to retrofit existing R-22 a/c equipment due to significantly higher operating pressures and much higher cooling capacity as outlined in the chart below. R-410A when operating at normal operating pressures and temperatures has higher pressures. R-410A cannot be used as a "drop-in" replacement for R-22; the higher operating pressures will damage R-22 compressors and components. Therefore the old R-22 refrigerant systems needed to be buffed up some to handle the higher pressures. Because of this R-410A and R-22 equipment cannot be cross matched.

R-410A has unique performance specifications and characteristics for oil, moisture indication, thermal expansion valves, compressors, filter driers and refrigerant handling. R-410A air conditioners use newer synthetic lubricants that are usually more soluble with the R-410A than the old mineral oils are with the older R-22 refrigerants. R-410A systems use mineral oils for lubrication. R-410A systems can be more reliable than R-22 systems. R-410A air conditioners and heat pumps are today's "state of the art" systems, and utilize the most current technology available for efficient and reliable operation.

R-410A was developed to replace the ozone depleting R-22 refrigerant now used in most residential and some commercial air conditioning equipment. R-410A has no ozone depletion potential but does have a higher global warming potential.

R-410A has quickly become the refrigerant of choice for use in air conditioning applications because the refrigerant delivers higher efficiency and better Total Equivalent Warming Impact (TEWI) than other choices. Make sure that if you are installing a new air conditioning system, that you specify that the new system uses R-410A. Not only is a R-410A system more reliable, but remember that R-22 use will be discontinued in 2010. An R-410A system will give you the best and most effective service for the foreseeable future.

on Dec 14, 2009 | Heating & Cooling

1 Answer

How do I recharge the freon in my unit? model is 38CKB060300

Hello, freon should be charged by a hvac technician with a epa card. But the way you charge it in is hook up the manifold gauges to the unit tjen take the yellow and hook it up to your refrigerant bottle. If this is a R-22 unit then you add vapor refrigerant to the low side of the system untill your superheat is correct if it is a fixed orifice system, however if it is a txv system then you chek the subooling. If it is a 410a system then the same principle applies however you flip the cylinder upside down and add liquid refrigerant through the low side a little at a time here is a link that shows you proper charging methods

May 27, 2011 | Carrier 38CKC036 Air Conditioner

1 Answer

Is there a universal gauge set for all types refrigerant

The most common manifold are only for r-12 and R134A. Because of the pressure differences between that and R22 and R-410A ( and the manufactors make more money by keeping the types of manifolds seperate). I haven't seen a universal manifold that would cover all types freon.

Feb 05, 2011 | Robinair R-134a Manifold Gauge Set A/c...

1 Answer

Where do I add the new r 410a refridgerant on 2004 Pontiac vibe?

410a cannot be used in a automotive system it will cause damage to your compressor, other other a/c components.
410a is used for home use a substitute for R-22
see below definition.

Although the United States Environmental Protection Agency has mandated that R-22 along with other hydrochlorofluorocarbons (HCFCs) be phased-out in the United States, few window-mounted air conditioners are available that use R-410A. However, all of the largest central air conditioning systems manufacturers in the United States offer R-410A. As an alternative to window-mounted systems, a ductless "split" system is available which uses R-410A refrigerant, and can be installed with a 3-inch hole through the wall (or window opening).[4] R-410A has replaced R-22 as the preferred refrigerant for use in residential and commercial air conditioners in Japan and Europe.
Parts designed specifically for R-410A must be used as R-410A operates at higher pressures[5] than other refrigerants. Thus R-410A systems require service personnel to use different tools, equipment, safety standards and techniques.[6] Equipment manufacturers are aware of these changes and require the certification of professionals installing R-410A systems. In addition the AC&R Safety Coalition has been created to help educate professionals about R-41-A system.
manufactures recommendations for vehicle

  • R-134a is the only approved refrigerant for use in this vehicle. The use of any other refrigerant may result in poor system performance or component failure.
  • To avoid system damage use only R-134a dedicated tools when servicing the A/C system.
  • Use only Polyalkylene Glycol Synthetic Refrigerant Oil (PAG) for internal circulation through the R-134a A/C system and only 525 viscosity mineral oil on fitting threads and O-rings. If lubricants other than those specified are used, compressor failure and/or fitting seizure may result.
  • R-12 refrigerant and R-134a refrigerant must never be mixed, even in the smallest of amounts, as they are incompatible with each other. If the refrigerants are mixed, compressor failure is likely to occur. Refer to the manufacturer instructions included with the service equipment before servicing.

Oct 19, 2010 | 2004 Pontiac Vibe

2 Answers

Do you have to charge a 3 ton 410a unit split as a liquid? on a 85 d day

It is always best to charge 410a as a liquid to ensure that you get the proper mixing of the refrigerant...just turn the can upside down and take your time adding the liquid slowly...with the unit running.


Aug 09, 2010 | Whirlwind FH-778 Air Conditioner

1 Answer

Chargeing Unit

The old 410A fittings are different than the r-22 fittings. There are adapters available on ebay. Remember 410A runs at higher pressures than 22. Be sure to use gauges for 410A! Use the right gauges with the right hoses! High pressure.. Use the right gauges and the right hoses!

Jul 30, 2010 | AmcorAire UCHW-H18AF2 Split System Air...

1 Answer

What should the pressure readings be for a American Standard Freedom 500 2.5 ton air conditioner be

Hi, this depends on the outdoor air temperature and type of freon this unit has. The hotter it is outdoors, the higher the pressure will be as they use a pressure/temperature relationship. If the unit is R-22 and lets say it is 90* F. out side, the low side or suction side will be at around 68 to 72 p.s.i which would give you an evaporator temperature of 40* F. Head pressure would be at around 90* plus 27*= 245p.s.i. This is if the condenser fan is in good condition and the outdoor coil is clean. If you are using a set of manifold gauges you have the pressure/temperature scale right on it. If the unit has a TXV for metering, you would need to charge it using the subcooling method. On a Non-TXV you would use the superheat method. If you are using the new R-410a freon, the pressure are extremely high in these systems compared to the R-22 system, so make sure you look at the units data plate to read the type of freon. The color of the container is green for R-22 and a Pink for R-410a and the 410 a unit will display a pink warning sticker on the unit to tell you. The pressures on the R-410 would be at 90* F, low or suction side at that temp is around 125 p.s.i., and around 400 to 420 p.s.i. on the high side, much higher then the R-22. You would also need a manifold gauge set made just for the R-410a (AZ-20) as of the extreme pressures in the system. There is never a set pressure to go by as the outdoor temperature will raise and lower the pressure of freon very fast. If you are asking this question because you have a manifold set and are taking a reading, the unit has a charging method pasted right on it from the factory showing what pressure they want it to run at. Your gauges also can be used as a pressure temperature chart, or you can pick one up free of cost at a a/c parts house to keep with you. It will show you how to calculate the charge for your unit. If you are familar with pressures, this should be of a great help to you. I hope that I have helped you on getting the unit charged properly. Please keep me in mind when rating me, as I know you will be kind. Just drop by a wholesale a/c parts house, walk in and ask for a pressure temperature chart, and they will hand you a couple of them. They have very good information and no how on all of the most common freons in use today.
Best of luck
A/C, Heating, & Refrigeration Contractor

Jul 29, 2010 | Heating & Cooling

1 Answer

How to refill gas in home spli a/c, advise presure details as wel

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.

Mar 19, 2010 | Panasonic CW-1006FU Air Conditioner

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