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R-410A Refrigerant Certification Course
DESIGN AIR UNIVERSITY
2008
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DESIGN AIR UNIVERSITY 2
Topics
• Links to info. sites
• History & Names
• HFC phase-out
• Properties of R-410A
• Chemistry
• Temp./ Pressure chart
• Safety
• Rules & Regulations
• Oils
• Tools
• Charging
• Recommendations
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DESIGN AIR UNIVERSITY 3
About website links
Some slides contain links to websites where you can access added information. These links are in light blue text. Depending on the speed of your internet connection, you may have to wait for the linked sites to load and appear on screen.
After visiting a site, just close the window while leaving your browser open. This will return you to this training program. If you aren’t interested, just don’t click the links.
If you don’t have a high-speed internet connection, you have probably already learned patience.
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DESIGN AIR UNIVERSITY 4
Who invented R-410A?
• AlliedSignal was an aerospace, automotive and engineering company that acquired and merged with Honeywell for $15 billion in 1999, after which the new group adopted the Honeywell name.
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DESIGN AIR UNIVERSITY 5
Allied Signal
• Products include Fram filters, Autolite spark plugs and Prestone anti-freeze.
• Genetron refrigerants.
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DESIGN AIR UNIVERSITY 6
Names, lots of names
• Genetron AZ-20 is Honeywell's original name for R-410A, a Honeywell invention that entered the scene in a test market in 1993 as a chlorine-free R-22 replacement. With its energy efficiency and none-ozone depletion advantages over R-22, R-410A is now the leading replacement for R-22 in new residential air conditioners.
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DESIGN AIR UNIVERSITY 7
Other Names
• Carrier calls it Puron
• Dupont calls it Suva 9100
• Rheem calls it ProZone
• Lennox calls it Environ
• Sanyo calls it Cooleron
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DESIGN AIR UNIVERSITY 8
It’s all the same stuff . . . R-410A
• In fact, if you buy a jug of “Puron”, it will probably have Allied Signal’s or Honeywell’s name on it.
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DESIGN AIR UNIVERSITY 9
Bye-bye R-22!
• R-22 will disappear from the new equipment marketplace by year 2010.
• Manufacturers have already begun to phase out their R-22 equipment offerings.
• R-410A is the refrigerant of choice to replace R-22.
• It has already begun to do so.
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DESIGN AIR UNIVERSITY 10
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DESIGN AIR UNIVERSITY 11
R-22 Phase-out News Update
• Final phase-out remains year 2020.
• Previously mandated reductions were 65% of 1989 production levels by 2010.
• Revised reductions are 75% by 2010.
• China, India & Mexico will move up their R-22 equipment phase-out by 10 years.
– Source: The News; Oct. 2007
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DESIGN AIR UNIVERSITY 12
Some advertisers may be guilty of exaggeration.
• For an impartial, third party discussion of the phase-out of HCFCs like R-22, you and your customers can go to the website of the U.S. Environmental Protection Agency (EPA) at:
R-22 phase-out discussion at EPA website
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DESIGN AIR UNIVERSITY 13
Why is R-410A so desirable?
• Operates in the same temperature ranges as R-22.
• The cooling equipment can share the same basic design as traditional equipment.
• For example . . .
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DESIGN AIR UNIVERSITY 14
41° F.
113° F.
70 235
R-22
122 380
R-410A
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DESIGN AIR UNIVERSITY 15
R-410A
• Cylinder color: rose (pink).
• R-22 comes in a green cylinder.
• Never mix these refrigerants together.
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DESIGN AIR UNIVERSITY 16
Characteristics of R-410A
• Operates at pressures about 60% higher than R-22.
• Used with POE oil.
• For new, specially-designed equipment only.
• Cannot be retrofitted into older equipment !!!
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DESIGN AIR UNIVERSITY 17
Other characteristics
• A 500 micron vacuum will NOT remove all moisture from the system.
• The POE oil grabs onto water and won’t give it up to our vacuum pumps.
• Always install a filter drier on the liquid line whenever the system has been open to the atmosphere; even new systems!
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DESIGN AIR UNIVERSITY 18
Replacing Driers
• Always cut out the old drier.
• Never use your torch for removal.
• The heat will drive the captured moisture out of the drier back into the system.
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DESIGN AIR UNIVERSITY 19
Basic chemistry
• CFC = chlorofluorocarbon (ie: R-12).
• HCFC = hydrochlorofluorocarbon (R-22).
• HFC = hydrofluorocarbon (R-410A).
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DESIGN AIR UNIVERSITY 20
CFCs
• Comprised of chlorine, fluorine & carbon.
• Extremely stable and long-lived.
• Drift into the highest levels of the troposphere where they will destroy many ozone molecules for many years.
• Phased out of production in 1996.
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DESIGN AIR UNIVERSITY 21
HCFCs• Comprised of hydrogen,chlorine, fluorine
& carbon.
• Less stable and long-lived.
• Break down quickly in the lower levels of the atmosphere.
• Only 2% to 5% of the ozone depletion potential of CFCs.
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DESIGN AIR UNIVERSITY 22
HFCs
• Comprised of hydrogen, fluorine & carbon.
• No chlorine atom.
• Zero ozone depletion potential.
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DESIGN AIR UNIVERSITY 23
Some new terms:
• When two blended refrigerants separate easily, they are called Zeotropic.
• When blended refrigerants don’t segregate in the system, but form a stable chemical composition they are called Azeotropic.
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DESIGN AIR UNIVERSITY 24
R-410A Chemistry
• 50 - 50% blend of HFC-32 and HFC-125.
• Near-azeotropic properties.
• Chemical name:– Difluoromethane, Pentafluoroethane
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DESIGN AIR UNIVERSITY 25
Concerns with Blends
• Fractionation
• Temperature glide
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DESIGN AIR UNIVERSITY 26
Fractionation• The tendency of one or more
components of a blend to leak at a faster rate than other components.
• Changes the composition of the remaining blend still in system.
• Loss of performance results.
• Occurs in zeotropic blends like R-407C.
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DESIGN AIR UNIVERSITY 27
What is Temperature Glide?
• Difference in two temperatures at a given constant pressure.
• For example . . .
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DESIGN AIR UNIVERSITY 28
In the evaporator . . .
• The temperature at which liquid refrigerant first begins to boil is known as the saturated liquid temperature, (also known as the bubble point temperature).
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DESIGN AIR UNIVERSITY 29
2nd Temperature
• The temperature at which the last drop of liquid refrigerant has boiled off is known as the saturated vapor temperature, (also known as the dew point temperature).
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DESIGN AIR UNIVERSITY 30
Temperature Glide
• At a constant pressure, the difference between the saturated vapor temperature and the saturated liquid temperature is referred to as the temperature glide of the refrigerant.
• The temperature glide of a single compound refrigerant like R-22 is zero.
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DESIGN AIR UNIVERSITY 31
R-410A Temperature Glide
• The temperature glide of R-410A is 0.2°F or essentially zero as well.
• This is good!
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DESIGN AIR UNIVERSITY 32
Key Attribute of R-410A
• Near-Azeotropic properties means it acts like a single compound with minimal temperature glide or fractionation potential.
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DESIGN AIR UNIVERSITY 33
Benefit to you is . . .
• A temperature-pressure chart can easily be used for charging, refrigerant cycle analysis and diagnosis.
• Advance to the temperature pressure chart for R-410A
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DESIGN AIR UNIVERSITY 34
Temp. °F Press.
26.3° 90
28.9° 95
31.4° 100
33.8° 105
36.2° 110
38.5° 115
40.7° 120
42.8° 125
44.9° 130
47° 135
49° 140
50.9° 145
52.8° 150
Temp. °F Press.
54.7° 155
56.5° 160
58.3° 165
60° 170
61.7° 175
63.4° 180
65° 185
66.6° 190
68.2° 195
69.8° 200
71.3° 205
72.8° 210
74.2° 215
Temp. °F Press.
75.7° 220
77.1° 225
78.5° 230
79.9° 235
81.3° 240
82.6° 245
83.9° 250
86.5° 260
89° 270
91.5° 280
93.9° 290
96.3° 300
98.5° 310
Temp. °F Press.
100.7° 320
105° 340
109.1° 360
113.1° 380
116.9° 400
120.5° 420
124.1° 440
127.5° 460
130.8° 480
134° 500
137.2° 520
140.2° 540
143.2° 560
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DESIGN AIR UNIVERSITY 35
Tech Tip
• You never want to see a suction pressure below 100 psi with R-410A air conditioning systems.
• Why?
• Look it up on the previous slide.
• At 100 psi, the evaporator will begin to frost over.
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DESIGN AIR UNIVERSITY 36
Refrigerant Comparison
• Refrigerant R-12 R-22 R-410A
• ODP* 1 0.055 0
• GWP° 8500 1700 1975
• Type CFC HCFC HFC
• Developed 1931 1936 1991
– * ODP = ozone depletion potential
– ° GWP = global warming potential. Source: IPCC Climate Change 2001
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DESIGN AIR UNIVERSITY 37
Automotive Refrigerants
• Refrigerant R-134A R-744 (CO2)
• ODP* 0 0
• GWP° 1300 1
• Type HFC natural element
• Developed 1990s 1850s
– * ODP = ozone depletion potential
– ° GWP = global warming potential.
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DESIGN AIR UNIVERSITY 38
HFCs in Europe
• In 2011, the current HFC R-134A will be forbidden for use in air conditioning of new vehicle types throughout the European Community.
• The German car manufacturers have agreed on the use of R-744 (carbon dioxide).
• Toyota will reportedly follow suit.
• The global warming potential of R-744 is less by a factor of 1,300 than that of R134A.
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DESIGN AIR UNIVERSITY 39
Is R-410A a “Perfect Refrigerant”?
• No. There is no “perfect refrigerant.”
• It has a slightly higher Global Warming Potential than R-22.
• However, this is somewhat offset because R-410A has a 5 - 6% higher Energy Efficiency Rating than R-22.
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DESIGN AIR UNIVERSITY 40
Don’t vent R-410A !
• R-410A is covered by the same rules of the Clean Air Act as all other refrigerants.
• Just because it doesn’t deplete the ozone layer, doesn’t mean you can release it.
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DESIGN AIR UNIVERSITY 41
Myths
• For a somewhat dated discussion of a few of the common myths related to R-410A, click the link below to go to the Honeywell website:
• Common R-410A Myths
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DESIGN AIR UNIVERSITY 43
Safety
• Most of the safety precautions are the same for R-410A as R-22.
• For example, never expose cylinders of either refrigerant to temperatures above 125° F.
• Use the same storage rules for both.
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DESIGN AIR UNIVERSITY 44
Safety
• R-410A has been confirmed to be in the low toxicity range.
• ASHRAE Safety Group: A1/A1.
• UL Class: Practically Non-flammable.
• DOT Green Label: Non-flammable.
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DESIGN AIR UNIVERSITY 45
Safety
• Ingestion:
– Don’t drink it!
– Don’t induce vomiting if someone else does.
– Seek immediate medical attention.
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DESIGN AIR UNIVERSITY 46
Safety
• Skin or Eye Contact:
– Same as other refrigerants; causes frostbite.
– Flush with lukewarm water.
– Seek immediate medical attention.
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DESIGN AIR UNIVERSITY 47
Safety
• Avoid exposing it to high temperatures.
– Watch your torch!
– Exposure to flame can produce toxic compounds.
– Contact with red hot metals like abraded aluminum can result in exothermic or explosive reactions.
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DESIGN AIR UNIVERSITY 48
Safety• Inhalation:
– Same as other refrigerants.
– Attacks central nervous system.
– Causes dizziness & then unconsciousness.
– Slurred speech; loss of muscle coordination.
– Can cause cardiac irregularities & ultimately, death.
– Get to fresh air & seek immediate medical attention.
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DESIGN AIR UNIVERSITY 49
Safety
• R-410A is heavier than air.
• It will displace oxygen.
• If a leak has occurred in a confined area, ventilate with fresh air before entering.
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DESIGN AIR UNIVERSITY 50
Material Safety Data Sheet
• MSDS for Genetron AZ-20
Click the link below to access and print your own copy
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DESIGN AIR UNIVERSITY 51
Oils
• R-22 uses alkylbenzene oil.
• R-410A uses polyol ester (POE) oil.
• Oils must be miscible with refrigerant.– miscible = able to mix together.
• Oils must be matched with the proper refrigerant.
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DESIGN AIR UNIVERSITY 52
Advantages of POE Oil
• Better oil return properties.
• Better heat transfer characteristics.
• Better lubrication ability.
• Wax free.
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DESIGN AIR UNIVERSITY 53
Oil Characteristics
• Great lubricant.
– But !
• It’s “hygroscopic”: strong attraction to moisture.
• Will absorb water vapor right into the oil.
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DESIGN AIR UNIVERSITY 54
Oil Handling Procedures
• Keep POE oil sealed in metal containers.
• Keep condensing unit and compressors sealed until right before brazing.
• Always install a liquid line drier whenever R-410A systems have been exposed to the atmosphere.
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DESIGN AIR UNIVERSITY 55
POE Oil Warning!
• POE oil is manufactured by combining alcohol and acid which then gives off water. The water is then removed.
• Allowing moisture to enter the system can reverse this process and turn the POE oil to a combination of acid and organic salts!
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DESIGN AIR UNIVERSITY 56
Oil Disposal
• It’s against the law to just dump waste oil.
• EPA does not classify refrigeration oils as hazardous waste, but . . .
• Do not mix oils with other wastes.
• Do not mix refrigeration oils with waste oils from other sources.
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DESIGN AIR UNIVERSITY 57
Oil Disposal
• Waste oil is your responsibility.
• Legally you own it . . . for life!
• Recycle it.
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DESIGN AIR UNIVERSITY 58
POE Oil Safety
• POE oil irritates the skin.
• Wash affected skin with soap & water.
• POE oil has been known to damage some rubber roofs!
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DESIGN AIR UNIVERSITY 61
Leak repair regulations
• EPA 608 requires technicians to find & repair leaks that are over 15% of the total system charge annually.
• R-410A is covered by this rule as well.
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DESIGN AIR UNIVERSITY 62
Leak Testing
• Electronic leak detectors designed for HFCs work well.
• So do mixtures of dry nitrogen & R-410A.
• “Bubbles” and Ultrasonic leak detectors can also be used.
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DESIGN AIR UNIVERSITY 63
Leak Testing Caution!
• Do not use halide leak detectors designed for R-22.
• Never use a mixture of compressed air and R-410A to check for leaks as this mixture is flammable above one atmosphere (ie: 14.7 psi.).
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DESIGN AIR UNIVERSITY 64
A Word About Driers• Driers must be rated for R-410A.
• Most new driers can be used for all refrigerants.
• Pressure rating of drier’s shell must be higher.
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DESIGN AIR UNIVERSITY 65
Replacing old R-22 Systems
• The condensing unit and evaporator coil must be replaced with new matched components engineered for the higher pressures of R-410A.
• Expansion valves (TXVs) must be specific to R-410A.
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DESIGN AIR UNIVERSITY 66
Reusing existing line sets?
• Properly-sized, copper line sets in good condition w brazed connections can be reused with new R-410A equipment.
• They should be cleaned to remove all traces of the old mineral oil.
• Here is one possible flushing agent:Rx11 FlushClick here to research
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DESIGN AIR UNIVERSITY 67
Special Tools
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DESIGN AIR UNIVERSITY 68
Recovery Units
• Must be rated for R-410A.
• Oil-less design is best.
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DESIGN AIR UNIVERSITY 69
Gauges & Hoses
• High side range to 800 psi.
• Low side range to 250 psi. with a 550 psi retard.
• Hoses must be rated to 800 psi.
• Do NOT mix refrigerants in your tools.– Dissimilar oils will become contaminated.
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DESIGN AIR UNIVERSITY 70
Recovery Cylinders
• Rated for 400 psi.
– NOT 300 psi like standard cylinders.
• Color: Gray with yellow top.
• DOT 4BA400 or 4BW400
• Do NOT recover different refrigerants into the same cylinders!
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DESIGN AIR UNIVERSITY 71
Recovery Cylinders
• Must be replaced or tested (w date stamp) every 5 years.
• Do not mix refrigerants in the same recovery tank!
• Never fill above 80% full.
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DESIGN AIR UNIVERSITY 72
Charging R-410A Systems
• Most new equipment will employ thermostatic expansion valves (TXVs) to meter refrigerant into the evaporator.
• This is a highly desirable feature which allows improved comfort control by maintaining a fully active evaporator under a wide array of operating conditions.
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DESIGN AIR UNIVERSITY 73
Charging Procedure
• Charge as a liquid
– Invert cylinder
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DESIGN AIR UNIVERSITY 74
When charging with liquid . . .
• Use a charging valve
– Such as Ritchie # 41123
– This will flash the refrigerant to the vapor state so that it can safely be put into the suction line of the system.
– 5/16” for most mini-splits.
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DESIGN AIR UNIVERSITY 75
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DESIGN AIR UNIVERSITY 76
Charging by Sub-cooling
• Charging is often done by sub-cooling.
• You may already be familiar with this method if the R-22 systems you were installing had TXVs.
• We’ll review it now:
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DESIGN AIR UNIVERSITY 77
Charging by Sub-cooling
1. Operate the system to stabilize temperatures & pressures.
2. If the outdoor temperature is less than 65°F., restrict the air flow across the condenser until the high side pressure on your red gauge reaches 350 psig.
3. If over 65°F., simply measure the liquid line pressure.
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DESIGN AIR UNIVERSITY 78
Charging by Sub-cooling
4. Determine the saturation temperature that corresponds to that pressure. You can read this off your red gauge or use a chart for R410A.
5. Measure the liquid line temperature at the service valve on the condensing unit using a fast-acting digital thermometer clamped to the liquid line and insulated from ambient temperatures.
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DESIGN AIR UNIVERSITY 79
Charging by Sub-cooling
6. Subtract the liquid line temperature from the saturation temperature to get the sub-cooling.
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DESIGN AIR UNIVERSITY 80
Adjusting the Charge
• If sub-cooling is too low, add refrigerant.
• If sub-cooling is too high, recover refrigerant.
• If the equipment manufacturer does not state a target sub-cooling, use 10°-15°F.
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DESIGN AIR UNIVERSITY 81
Charging Rheem units:
• It’s even easier!
• Compare the high side pressure on the chart attached to the unit’s access door with your gauge pressure for any given outdoor temperature and adjust accordingly.
• Add refrigerant to raise pressure.
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DESIGN AIR UNIVERSITY 82
Sample Charging Chart
Suction Pressure
Outdoor Temp.
LiquidPress.
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DESIGN AIR UNIVERSITY 83
Using charging charts
Suction Pressure = 125 psig
Outdoor Temp. =
80° F.
LiquidPress. should
be 306 psig
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DESIGN AIR UNIVERSITY 84
Of course . . .
• Airflow must be correct;
• Refrigerant line sizing must be correct;
• Let the system run for 10-15 minutes to stabilize temperatures & pressures.
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DESIGN AIR UNIVERSITY 85
Charging by weight
• The preferred method.
• Use the manufacturer’s data to determine how many ounces of refrigerant to add or recover.
• Based on factory charge plus length and diameter of liquid line.
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DESIGN AIR UNIVERSITY 86
More charging tips: Sight Glass
• Most systems will not have a sight glass.
• Do NOT try to clear the sight glass when charging. You risk an overcharge.
• It is normal for part of the blend to flash to a vapor in the sight glass.
• This will reform into 100% liquid later.
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DESIGN AIR UNIVERSITY 87
Fast Facts
• R-410A will replace R-22 in new equipment by 2010.
• R-410A can only be used in equipment designed specifically for it.
• R-410A operates at pressures 60% higher than R-22.
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DESIGN AIR UNIVERSITY 88
Fast Facts 2
• The saturation temperatures of R-410A are similar to those of R-22.
• Technicians need special tools to work on R-410A systems.
• R-410A comes in pink cylinders.
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DESIGN AIR UNIVERSITY 89
Fast Facts 3
• R-410A was invented by Allied Signal (now called Honeywell).
• R-410A is non-flammable.
• Do not expose cylinders of R-410A to temperatures above 125° F.*
* The same is true of cylinders of R-22.
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DESIGN AIR UNIVERSITY 90
Fast Facts 4
• R-410A uses POE oil which is highly hygroscopic (attracts water).
• Always evacuate systems to 500 microns.
• All R-410A systems must have a drier installed in the liquid line.
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DESIGN AIR UNIVERSITY 91
Fast Facts 5
• Cylinders of R-410A must be inverted when adding refrigerant to a system.
• R-410A must leave the cylinder as a liquid with a charging valve used to flash the liquid to a vapor before being added to a system.
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DESIGN AIR UNIVERSITY 92
Fast Facts 6
• R-410A does not deplete the ozone layer, but it can never be vented to the atmosphere.
• It must be treated like all other refrigerants covered by the Clean Air Act.
• It is not classified as Hazardous Waste.
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DESIGN AIR UNIVERSITY 93
Fast Facts 7
• Recovery cylinders are gray with yellow tops.
• Recovery cylinders should only be filled to 80% of their capacity by weight.
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DESIGN AIR UNIVERSITY 94
Fast Facts 8
• The old line set can be reused when replacing R-22 systems with R-410A equipment.
• Clean the old line set to remove all traces of mineral oil.
• Refrigerants & oils should not be cross-mixed.
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DESIGN AIR UNIVERSITY 95
Frequently asked questions:
• There is a good discussion of R-410A questions at the Emerson Climate Technologies website. They make the Copeland Scroll compressor that many OEMs use in their equipment.
• Click here for FAQs
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DESIGN AIR UNIVERSITY 96
Prediction
• It is likely that many manufacturers of air conditioning equipment will convert all of their products to R-410A before the January 2010 deadline.
• Don’t procrastinate!
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DESIGN AIR UNIVERSITY 97
In Conclusion
• DESIGN AIR has been selling air conditioning equipment using R-410A for over 5 years.
• These are highly-reliable, efficient and “Green” systems.
• Consumers find them highly-desirable.
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DESIGN AIR UNIVERSITY 98
The Future is Now!
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DESIGN AIR UNIVERSITY 99
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DESIGN AIR UNIVERSITY 100
About the exam
• The exam is written in a pdf-type file which requires software called Acrobat Reader from Adobe Systems Inc.
• Most computers already have Acrobat Reader installed, but if yours doesn’t, you can download it for free here:
• Get Acrobat Reader here
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DESIGN AIR UNIVERSITY 101
Time to get certified.
• Go to the Certification Exam
• Fax it to 414-276-5569 for grading and to complete the certification process.
• Include your return fax number to receive your score. Note: no certificate or diploma will be sent.