HVAC Certification Core

• Metering device, reduction in pressure
• Evaporator, heat is absorbed, causing liquid to boil into a vapor
• Compressor, refrigerant is now a low temperature low pressure vapor
• Condenser, refrigerant is now a high temperature high pressure vapor
• Condenser Outlet, as the refrigerant expels heat it condenses to a liquid and becomes a high pressure liquid

Type I, Type II, Type III, Universal

Crop Loss, Increase in Eye Dieseases, Skin Cancer, Reduced Marine Life, Deforestation, Increased Ground Level Ozone

Chlorine, Fluorine, Carbon

Types: R-11, 12, 500

Hydrogen, Chlolrine, Fluorine, Carbon

Types: R-22, 123

Hydrogen, Fluorine, Carbon

Types: R-134a

Regulation set forth by the US Governement for section 608

• Falsify, fail to keep records
• Fail to reach required evacuation rates
• Knowingly vent CFCs, HCFCs, or HFCs
• Work without certification
• Fail to recover CFCs, HCFCs, or HFCs
• Fail to have approved recovery devices
• Add nitrogen to a fully charged system
• Dispose of cylinder without recovering regrigerant

• Phase out of production of Ozone depleting substances in developed countries
• CFCs were phased out on Dec 31,1995
• Future supplies will come from recovered, recycled, or reclaimed refrigerants

• Recover, to remove refrigerant in any condition from a system and store it externally
• Recycle, to clean refrigerant for reuse by separating the oil and removing moisture by passing it through filters
• Relaim, to process refrigerant to a level equal to virgin product standards (must meet the standard set forth in ARI 700 before it is sold)

• System Dependent
• Self Contained

• CFC R-12
• R-134a is considered Ozone friendly, and can be used in most R-12 systems
• Must use pressurized nitrogen when testing for leaks

A blend of three parts, used with a synthetic alkylbenzene lubricant

• The components of a blended refrigerant will leak from a system at uneven rates due to different vapor pressures
• Proper charging method for blended refrigerants is to weigh into the high side of the system liquid
• Temperature Glide, refers to a refrigerant blend that has a range of boiling points or condensing points throughout the evaporator and condenser respectively

Sale is restricted to certified technicians, and only those certified in Section 609 can purchase containers smaller than 20 pounds

• It is the Law
• If more than one refrigerent has been mixed in a system, you must recover the mixture in a separate tank
• When recovering from a system that experienced a compressor burn out, watch for signs of contamination in the oil
• Nitrogen may be legally vented, after checking for leaks
• Length of the hose between the unit being recovered from and the recovery machine will greatly effect the efficiency of the process, long hoses will cause excessive pressure drop and recovery time
• Guard against trapping liquid refrigerents between the service valves

Use an electronic or ultrasonic leak detector to determine the general area, the use soap bubbles to pinpoint the leak

• Dehydration is used to remove water and water vapor
• If moisture is allowed to remain in a system, hydrochloric and hydrofluoric acids may form

Be sure you attain the mandated vacuum level before evacuating the system to the ambient air

• Size of equipment being evacuated
• Ambient temperature
• Amount of moisture in the system
• Size of vacuum pump and suction line

• Piping connection to the pump should be as short as possible and as large in diameter as possible
• System vacuum gauge should be connected as far as possible from the vacuum pump
• Measuring a systems vacuum should be done with the system isolated and the pump turned off

• Specifically designed to be refilled
• Have 2 ports, one liquid and one vapor
• EPA requires that a refillable cylinder MUST NOT BE FILLED ABOVE 80% of its capacity by weight
• Must be hydrostatically tested and date stamped every 5 years

• DOT(Department of Transportation)
• Must also be identified by their colors, yellow tops and gray bodies.
• Must also be inspected for rust, if present they should be reduced to 0 psig and discarded

• Wear safety glasses, protective gloves, and follow all equipment manufacturers safety precautions
• Always charge through a pressure regulator and insert a relief valve downstream from the pressure regulator
• Relief valves MUST NOT be installed in series, and MUST be replaced if there is a corrosion build up

• It is critical to inspect the valve core for leaks, bends and breakage, replace damaged valve cores to prevent leakage and always cap ports to prevent accidental depression of the core
• NEVER heat a refrigerant cylinder with an open flame, do not cut or braze lines on a charged unit

• Don an SCBA, IMMEDIATELY VACATE AND VENTILATE the area
• Never expose R-12 or R-22 to open flames or glowing hot metal surfaces, they can decompose to form hydrocholoric acid, hydrofluoric acid, and phosgene gas
• Always read MSDS when working with solvents, chemicals or refrigerants

• Meets DOT standards
• Complete shipping paperwork
• Properly label cylinders
• Should be upright and marked with a DOT clasification tag indicating "2.2 non-flammable gas"