A) Do not work with refrigerant indoors or near open flames.
b) Always wear safety goggles.
V) Be careful not to get refrigerant in your eyes or on your skin. If refrigerant comes into contact with eyes or skin:
- Do not rub the burned area.
- Rinse the burned area with plenty of cold water and lubricate the skin with clean petroleum jelly.
- Do not try to treat yourself, contact a medical facility immediately.
2. When replacing parts of the cooling system.
A) Remove the refrigerant from the system before removing parts.
b) Openings of disconnected parts should be immediately closed with plugs to prevent moisture and dust from entering inside.
V) Do not store a radiator or receiver without plugs.
G) Before installing a new compressor, remove the refrigerant through the charging valve, otherwise the compressor oil will leave the system with the refrigerant when the plug is removed.
d) Do not use a blowtorch to bend or lengthen pipes, as a layer of oxides forms on the tubes, clogging the system.
3. When working with a charging cylinder.
A) Do not heat the container with an open flame.
b) The operating temperature of the cylinder is 40°C.
V) When heating the cylinder in hot water (before charging the air conditioner) make sure the valve is not immersed in water, as water may enter the system.
G) Recycling and reuse of cylinders is prohibited.
4. When refueling a running air conditioner.
A) If there is not enough refrigerant in the A/C system, lubrication will be poor and the compressor may overheat, so the refrigerant level must be maintained.
b) Opening the high pressure valve may cause the filling cylinder to rupture, so only open the low pressure valves.
V) Do not turn the cylinder upside down when charging, because. liquid refrigerant may enter the compressor. Charge the system with refrigerant gas only.
G) Do not overcharge the system as this leads to engine overheating and increased fuel consumption.
5. When working with a leak detector.
A) Since the detector uses the open flame principle, strictly observe fire safety measures.
b) When the refrigerant is heated, poisonous gas is generated, so ensure adequate ventilation.
Features when working with R134a refrigerant
1. The large differences in the properties of R12 and R134a refrigerants require different refrigeration systems for each type of refrigerant. Never allow them to be mixed even in small quantities, because. this will cause serious system malfunctions.
2. Use compressor oil appropriate for the refrigerant. Toyota recommends ND - OIL 8 for systems using R134a.
Note: ND - OIL 8 is aggressive towards acrylic rubber products, so avoid contact between them.
Mixing oils for different systems leads to compressor failure.
3. Use O-rings designed for this refrigerant.
The R134a refrigerant destroys the gaskets for R12, and the system is depressurized.
4. When tightening connections.
A) Lightly lubricate the rubber seals on the fittings with compressor oil.
b) When tightening, use two wrenches to prevent twisting.
V) Tighten only to the specified torque.
5. Plug open hose ends and fittings immediately to prevent moisture and dust from entering.
6. Remove plugs just before connecting parts.
7. Bleed off the refrigerant through the charging valve before installing the new compressor, otherwise the compressor oil will spray out with the refrigerant when the plug is removed.
Special accessories for R134a refrigerant
1. Use a separate pressure gauge block to prevent R12 refrigerant and R12 compressor oil from entering the R134a refrigerant system.
2. Use a leak detector for R134a refrigerant as the leak detector for R12 is not sensitive enough to R134a.
3. Use a vacuum pump adapter that can be used for both types of refrigerants.
Note: close gauge block valves immediately after evacuating the system. Then turn off the pump. If the procedure is reversed, air may enter the system.