1 HVACR415 – Mechanical for Air Conditioning System Recovery.

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HVACR415 – Mechanical for Air Conditioning

HVACR415 – Mechanical for Air Conditioning

System RecoverySystem Recovery

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RecoveryRecovery

• All recovery machines are different. Make sure you read the operation manual for the machine you are using.

• Using a machine in the wrong manner can cause equipment damage and personal injury.

• Safety glasses must be worn at all times.

• All recovery machines are different. Make sure you read the operation manual for the machine you are using.

• Using a machine in the wrong manner can cause equipment damage and personal injury.

• Safety glasses must be worn at all times.

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THE 3 R’STHE 3 R’S

• The three R’s of protecting the environment are:– Recovery– Recycling– Reclamation

• The three R’s of protecting the environment are:– Recovery– Recycling– Reclamation

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Recovery GuidelinesRecovery Guidelines

• Refrigerant should be recovered from a system as a liquid.– This is quicker and easier.– Recovering as a vapor will take considerably

longer.

• Refrigerant hoses should be good quality and have good sealing gaskets.

• Refrigerant should be recovered from a system as a liquid.– This is quicker and easier.– Recovering as a vapor will take considerably

longer.

• Refrigerant hoses should be good quality and have good sealing gaskets.

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Recovery GuidelinesRecovery Guidelines

• Some recovery units may require a warm-up period of up to 10 minutes.

• Read all information regarding the recovery units you are using.

• Some recovery units may require a warm-up period of up to 10 minutes.

• Read all information regarding the recovery units you are using.

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RecoveryRecovery

• Recovery is defined by the EPA as:– To remove refrigerant in any condition from a

system and store it in an external container without necessarily testing or processing it in any way.

• Refrigerant recovered can be re-used in the same system.

• Refrigerant recovered can be re-used in a different system if owned by the same owner.

• Recovery is defined by the EPA as:– To remove refrigerant in any condition from a

system and store it in an external container without necessarily testing or processing it in any way.

• Refrigerant recovered can be re-used in the same system.

• Refrigerant recovered can be re-used in a different system if owned by the same owner.

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RecoveryRecovery

• Per the EPA refrigerant that has been recovered can not be sold to another customer unless it meets new refrigerant specifications under ARI-700.

• Per the EPA refrigerant that has been recovered can not be sold to another customer unless it meets new refrigerant specifications under ARI-700.

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RecyclingRecycling

• Recycling Refrigerant is defined as:– To clean the refrigerant by oil separation and

single or multiple passes through devices such as replaceable core filter dryers.

• The filter dryers reduce moisture, acid, and particulate matter.

• Recycling means to clean up the refrigerant.

• Recycling Refrigerant is defined as:– To clean the refrigerant by oil separation and

single or multiple passes through devices such as replaceable core filter dryers.

• The filter dryers reduce moisture, acid, and particulate matter.

• Recycling means to clean up the refrigerant.

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ReclaimReclaim

• Reclaiming refrigerant is defined as:– Processing refrigerant to new product

specifications by means that may include distillation.

• This requires chemical analysis of the refrigerant.

• The refrigerant is processed to new refrigerant standards.

• Reclaiming refrigerant is defined as:– Processing refrigerant to new product

specifications by means that may include distillation.

• This requires chemical analysis of the refrigerant.

• The refrigerant is processed to new refrigerant standards.

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ReclaimReclaim

• Refrigerant that is reclaimed may be sold without hefty excise taxes. This is an incentive to save and reclaim old refrigerant.

• Refrigerant that is reclaimed may be sold without hefty excise taxes. This is an incentive to save and reclaim old refrigerant.

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Recovery TechniquesRecovery Techniques

• Active Recovery– Uses a dedicated compressor in the machine to

move the refrigerant.– Can be done on a system with a bad or missing

compressor.

• Active Recovery– Uses a dedicated compressor in the machine to

move the refrigerant.– Can be done on a system with a bad or missing

compressor.

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• Passive Recovery– System dependent - systems compressor must

be operational.– Passive recovery uses the systems compressor

to move the refrigerant.

• Passive Recovery– System dependent - systems compressor must

be operational.– Passive recovery uses the systems compressor

to move the refrigerant.

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• Piercing Valves– You are required to recover refrigerant even in a

hermetic (sealed) system with no access valves or fittings.

– When servicing a sealed system you can not just cut the pipe and let the refrigerant out.

• Piercing Valves– You are required to recover refrigerant even in a

hermetic (sealed) system with no access valves or fittings.

– When servicing a sealed system you can not just cut the pipe and let the refrigerant out.

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• Piercing Valves (cont)– A piercing valve will clamp onto the line and

allow you to recover refrigerant so the system can be serviced.

– Piercing valves are temporary and can not be left on a system as they leak.

– Install a permanent valve while system is empty.

• Piercing Valves (cont)– A piercing valve will clamp onto the line and

allow you to recover refrigerant so the system can be serviced.

– Piercing valves are temporary and can not be left on a system as they leak.

– Install a permanent valve while system is empty.

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Recovery StepsRecovery Steps

• Step 1:– Get all equipment together.– You need:

• Gauges• Extra hose• Recovery Cylinder• Scale• Recovery Machine

• Step 1:– Get all equipment together.– You need:

• Gauges• Extra hose• Recovery Cylinder• Scale• Recovery Machine

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• Step 1 (Continued)– Net Refrigerant is found with the following

formula:

W.C.___X 0.8 = ____80% Liquid level +____ T.W. ____ Total Capacity weight

– W.C. and T.W. is stamped on the handle of the cylinder

– Do not overfill. These cylinders can explode.

• Step 1 (Continued)– Net Refrigerant is found with the following

formula:

W.C.___X 0.8 = ____80% Liquid level +____ T.W. ____ Total Capacity weight

– W.C. and T.W. is stamped on the handle of the cylinder

– Do not overfill. These cylinders can explode.

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• Step 2:– Connect your gauges to the equipment.– Red Hose (High Side) goes to the high side of the

equipment (Liquid Line)– Blue Hose (Low Side) goes to the low side of the

equipment (Suction Line)– Make sure all gauge valves are closed.

• Step 2:– Connect your gauges to the equipment.– Red Hose (High Side) goes to the high side of the

equipment (Liquid Line)– Blue Hose (Low Side) goes to the low side of the

equipment (Suction Line)– Make sure all gauge valves are closed.

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• Step 3– Connect the recovery machine.– Middle hose (yellow) from your gauge manifold

will connect to the inlet port of the recovery machine.

– Additional hose from the recovery machine will go to the liquid side of the recovery cylinder.

• Step 3– Connect the recovery machine.– Middle hose (yellow) from your gauge manifold

will connect to the inlet port of the recovery machine.

– Additional hose from the recovery machine will go to the liquid side of the recovery cylinder.

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• Step 4– Starting from the hoses connected to the

equipment you are recovering from purge all the air out of the hoses.

– Once you get to the gauges open both side handles and the valve that goes to the white hose. If you have an extra hose, leave that one closed.

• Step 4– Starting from the hoses connected to the

equipment you are recovering from purge all the air out of the hoses.

– Once you get to the gauges open both side handles and the valve that goes to the white hose. If you have an extra hose, leave that one closed.

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• Step 4 (Continued)– At the recovery machine turn the inlet valve to

ON and the discharge valve to ON.– Bleed the air out of the line at the recovery

cylinder.– Open the valve on the recovery cylinder.

• Step 4 (Continued)– At the recovery machine turn the inlet valve to

ON and the discharge valve to ON.– Bleed the air out of the line at the recovery

cylinder.– Open the valve on the recovery cylinder.

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• Step 5:– Turn the recovery machine ON and wait until all

the gauges show 0 PSI. (can go as low as 5 inches vacuum).

– Close the gauges and wait a few minutes to see if the pressure doesn’t rise from residual liquid in the system.

• Step 5:– Turn the recovery machine ON and wait until all

the gauges show 0 PSI. (can go as low as 5 inches vacuum).

– Close the gauges and wait a few minutes to see if the pressure doesn’t rise from residual liquid in the system.

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• Step 6:– Once system is empty then:– Close all gauge handles.– Purge the recovery machine if it has that

feature.– Turn off recovery machine.– Turn off recovery cylinder valve.

• Step 6:– Once system is empty then:– Close all gauge handles.– Purge the recovery machine if it has that

feature.– Turn off recovery machine.– Turn off recovery cylinder valve.

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• Step 7:– Disconnect recovery cylinder and machine – put

them aside.– Weigh the recovery cylinder – record the weight

and the net refrigerant recovered.

• Step 7:– Disconnect recovery cylinder and machine – put

them aside.– Weigh the recovery cylinder – record the weight

and the net refrigerant recovered.

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Recovery RulesRecovery Rules

• Recovered refrigerant can not change ownership.

• Refrigerant must be reclaimed to change ownership.

• The refrigerant is the property of the person who owns the equipment.

• Recovered refrigerant can not change ownership.

• Refrigerant must be reclaimed to change ownership.

• The refrigerant is the property of the person who owns the equipment.

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• Recovered refrigerant can not be mixed.

• Recovery containers must be DOT (department of transportation) approved and color coded gray with a yellow top.

• Recovered refrigerant can not be mixed.

• Recovery containers must be DOT (department of transportation) approved and color coded gray with a yellow top.

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• All newly manufactured recovery and recycling machines must be certified by an EPA approved organization to meet the requirements of the evacuation table (standards).

• Always evacuate the machine before each use.

• All newly manufactured recovery and recycling machines must be certified by an EPA approved organization to meet the requirements of the evacuation table (standards).

• Always evacuate the machine before each use.

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• When recovering R134A use a machine dedicated to that refrigerant.– The oil requirements are different.

• Recover as a liquid when possible. – Most recovery machines will first get the liquid

and then the vapor on their own.

• When recovering R134A use a machine dedicated to that refrigerant.– The oil requirements are different.

• Recover as a liquid when possible. – Most recovery machines will first get the liquid

and then the vapor on their own.

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• Make sure that you replace all the caps from the unit and the equipment.

• Caps on the recovery unit keep out contaminants.

• Make sure that you replace all the caps from the unit and the equipment.

• Caps on the recovery unit keep out contaminants.

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Do your repair workDo your repair work

• Now the system is empty. You can do whatever repair work you need to accomplish.

• Make sure that you do not leave any leaks or braze near your gauges while they are connected.

• Remove any schraeder cores while you are brazing. They have rubber seals and they will melt.

• Now the system is empty. You can do whatever repair work you need to accomplish.

• Make sure that you do not leave any leaks or braze near your gauges while they are connected.

• Remove any schraeder cores while you are brazing. They have rubber seals and they will melt.

1 HVACR415 – Mechanical for Air Conditioning System Recovery.

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