Precautions for Servicing A/C System (HFO-1234yf Refrigerant)
Precautions: Precautions for HVAC · A/C System Caution · Precautions for Servicing A/C System (HFC-134a Refrigerant) · General safety (00)
Handling HFO-1234yf (R-1234yf) Refrigerant and Specified Compressor Oil
WARNING:
•Refrigerant HFO-1234yf (R-1234yf) has characteristic of slight flammable gas though global warming potential (GWP) is extremely low, and may burn if leaked gas is ignited.
Perform the service work in a well-ventilated area and away from any open flames such as gas-fired water heater.
•If leakage of HFO-1234yf (R-1234yf) gas is assumed, take the following precautions to prevent health problems caused by the leaked gas.
Avoid contact with HFO-1234yf (R-1234yf) refrigerant and wear goggles and gloves whenever handling the refrigerant. Should the refrigerant happen to contact your eyes or skin, immediately take action as described below to prevent aggravating the condition:
Perform the service work in a well-ventilated area and away from any open flames such as gas-fired water heater.
•If leakage of HFO-1234yf (R-1234yf) gas is assumed, take the following precautions to prevent health problems caused by the leaked gas.
—Do not handle refrigerant in or near any area where welding or steam cleaning is performed.
—Keep refrigerant in a cold and dark place. Avoid storing it under direct sunlight, in a place close to fire or inside a vehicle.
—If HFO-1234yf (R-1234yf) is burned, avoid breathing fumes.
•Contact of liquid HFO-1234yf (R-1234yf) refrigerant with skin and eyes will cause frostbite. The refrigerant cools the surface coming in contact with it to a temperature much lower than the freezing point of water.—Keep refrigerant in a cold and dark place. Avoid storing it under direct sunlight, in a place close to fire or inside a vehicle.
—If HFO-1234yf (R-1234yf) is burned, avoid breathing fumes.
Avoid contact with HFO-1234yf (R-1234yf) refrigerant and wear goggles and gloves whenever handling the refrigerant. Should the refrigerant happen to contact your eyes or skin, immediately take action as described below to prevent aggravating the condition:
—In the event of eye contact, do not touch the eye with your hand. Instead, pour fresh cold water over the eye to raise gradually the temperature. After washing the eye thoroughly with water, receive medical attention as soon as possible.
—If liquid HFO-1234yf (R-1234yf) contacts your skin, wash the affected area thoroughly with water.
Since the skin may have been frostbitten, receive medical attention.
—If liquid HFO-1234yf (R-1234yf) contacts your skin, wash the affected area thoroughly with water.
Since the skin may have been frostbitten, receive medical attention.
NOTE:
•Do not discharge HFO-1234yf (R-1234yf) refrigerant into atmosphere.
•The specified compressor oil for HFO-1234yf (R-1234yf) is highly hygroscopic. Keep internal parts of air conditioning free from moisture and dirt. When disconnecting any line from system, install a blind plug or cap to the fitting immediately.
•If pipes or hoses are replaced, replenish A/C compressor with specified amount of compressor oil from suction side referring to “Replenishing Compressor Oil” in “Operation Procedure for Refrigerant Charge”.
•The specified compressor oil for HFO-1234yf (R-1234yf) is highly hygroscopic. Keep internal parts of air conditioning free from moisture and dirt. When disconnecting any line from system, install a blind plug or cap to the fitting immediately.
•If pipes or hoses are replaced, replenish A/C compressor with specified amount of compressor oil from suction side referring to “Replenishing Compressor Oil” in “Operation Procedure for Refrigerant Charge”.
—Manual type: 
—Automatic type:
—Automatic type:
Handling A/C Cycle Parts and Tooling
NOTE:
•Route drain hose so that drained water does not adhere to vehicle components.
•When connecting hoses and pipes, apply a few drops of compressor oil (refrigerant oil) to O-ring.
•Replace O-ring with new one, once hoses, pipes or parts are disconnected.
•Check local governmental regulations regarding working with refrigerator systems and its tooling.
•When connecting hoses and pipes, apply a few drops of compressor oil (refrigerant oil) to O-ring.
•Replace O-ring with new one, once hoses, pipes or parts are disconnected.
•Check local governmental regulations regarding working with refrigerator systems and its tooling.
Refrigerant Recovery
When discharging refrigerant out of A/C system, always recover it using refrigerant recovery and recycling equipment because discharging HFO-1234yf (R-1234yf) refrigerant into atmosphere would cause adverse effect to environment. For the method, refer to “Recovery” in “Operation Procedure for Refrigerant Charge”.
•Manual type:
•Automatic type:
•Automatic type:
Refrigerant Charge
After performing compressor oil replenishment and evacuation, charge the A/C system with a proper amount of refrigerant referring to “Charge” in “Operation Procedure for Refrigerant Charge”.
•Manual type:
•Automatic type:
•Automatic type: