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=====''Mazda RX-7 Air Conditioning General Servicing: specifications, R-134A systems and etc''=====
All R-134a based AC systems use 1/2" - 16 ACME threaded fittings (identifiable by square threads) and quick-connect service couplings. See Fig. 1. Besides the use of these fittings, most manufacturers will use Green colored "O" rings in R-134a systems.
Most R-134a based systems will be identified through the use of Green or Light Blue underhood labels, or with R-134a refrigerant clearly printed on labels. See Fig. 2. Some manufacturers will identify R-12 based systems with White, Red, Silver or Gold underhood labels. Before servicing an AC system, always determine which refrigerant is being used.
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Deletions:
=====''Mazda RX-7 Air Conditioning General Servicing''=====
All R-134a based AC systems use 1/2" - 16 ACME threaded fittings (identifiable by square threads) and quick-connect service couplings. See Fig. 1 . Besides the use of these fittings, most manufacturers will use Green colored "O" rings in R-134a systems.
Most R-134a based systems will be identified through the use of Green or Light Blue underhood labels, or with R-134a refrigerant clearly printed on labels. See Fig. 2 . Some manufacturers will identify R-12 based systems with White, Red, Silver or Gold underhood labels. Before servicing an A/C system, always determine which refrigerant is being used.
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2. The system's high pressure can cause severe injury to eyes and skin if a hose were to burst. Always wear eye protection when working around AC system and refrigerant. If necessary, wear rubber gloves or other protective clothing.
4. Never use R-134a in combination with compressed air for leak testing. Pressurized R-134a in the presence of oxygen (air concentrations greater than 60% by volume) may form a combustible mixture. DO NOT introduce compressed air into R-134a containers (full or empty), AC system components or service equipment.
5. DO NOT expose AC system components to high temperatures, steam cleaning for example, as excessive heat will cause refrigerant/system pressure to increase. Never expose refrigerant directly to open flame. If refrigerant needs to be warmed, place bottom of refrigerant tank in warm water. Water temperature MUST NOT exceed 125°F (52°C).
If the refrigerants are mixed, system cross-contamination or AC system component failure may occur. Always use separate servicing and refrigerant recovery/recycling equipment.
All R-134a based AC systems use 1/2" - 16 ACME threaded fittings (identifiable by square threads) and quick-connect service couplings. See Fig. 1 . Besides the use of these fittings, most manufacturers will use Green colored "O" rings in R-134a systems.
Refrigerant R-134a, when viewed through a sight glass, may have a "milky" appearance due to the mixture of refrigerant and lubricating oil. As the refrigerant and oil DO NOT exhibit a "clear" sight glass on a properly charged AC system, most R-134a systems have no sight glass.
Refrigerant R-12 based systems use mineral oil, while R-134a systems use synthetic/Polyalkylene Glycol (PAG) oils. Using a mineral oil based lubricant with R-134a will result in AC compressor failure due to lack of proper lubrication. The following R-134a refrigerant oils are currently available: Use ND-Oil 8 refrigerant oil with 10P/10PA swashplate compressors. Use synthetic refrigerant oil (ND-Oil 9) with most rotary vane compressors. On Millenia, MX-3, MX-6, 626 and 929, use ATMOS GU-10 refrigerant oil.
Refrigerant recovery/recycling equipment is used to remove refrigerant from vehicle's AC system without polluting atmosphere. To remove and recycle refrigerant, connect the recovery/recycling system and follow instructions provided with the equipment. The removed refrigerant is filtered, dried and stored in a tank within the recovery/recycling system until it is ready to be pumped back into the vehicle's AC system. With refrigerant stored in the recovery/recycling system, AC system can be opened without polluting atmosphere.
Deletions:
2. The system's high pressure can cause severe injury to eyes and skin if a hose were to burst. Always wear eye protection when working around A/C system and refrigerant. If necessary, wear rubber gloves or other protective clothing.
4. Never use R-134a in combination with compressed air for leak testing. Pressurized R-134a in the presence of oxygen (air concentrations greater than 60% by volume) may form a combustible mixture. DO NOT introduce compressed air into R-134a containers (full or empty), A/C system components or service equipment.
5. DO NOT expose A/C system components to high temperatures, steam cleaning for example, as excessive heat will cause refrigerant/system pressure to increase. Never expose refrigerant directly to open flame. If refrigerant needs to be warmed, place bottom of refrigerant tank in warm water. Water temperature MUST NOT exceed 125°F (52°C).
If the refrigerants are mixed, system cross-contamination or A/C system component failure may occur. Always use separate servicing and refrigerant recovery/recycling equipment.
All R-134a based A/C systems use 1/2" - 16 ACME threaded fittings (identifiable by square threads) and quick-connect service couplings. See Fig. 1 . Besides the use of these fittings, most manufacturers will use Green colored "O" rings in R-134a systems.
Refrigerant R-134a, when viewed through a sight glass, may have a "milky" appearance due to the mixture of refrigerant and lubricating oil. As the refrigerant and oil DO NOT exhibit a "clear" sight glass on a properly charged A/C system, most R-134a systems have no sight glass.
Refrigerant R-12 based systems use mineral oil, while R-134a systems use synthetic/Polyalkylene Glycol (PAG) oils. Using a mineral oil based lubricant with R-134a will result in A/C compressor failure due to lack of proper lubrication. The following R-134a refrigerant oils are currently available: Use ND-Oil 8 refrigerant oil with 10P/10PA swashplate compressors. Use synthetic refrigerant oil (ND-Oil 9) with most rotary vane compressors. On Millenia, MX-3, MX-6, 626 and 929, use ATMOS GU-10 refrigerant oil.
Refrigerant recovery/recycling equipment is used to remove refrigerant from vehicle's A/C system without polluting atmosphere. To remove and recycle refrigerant, connect the recovery/recycling system and follow instructions provided with the equipment. The removed refrigerant is filtered, dried and stored in a tank within the recovery/recycling system until it is ready to be pumped back into the vehicle's A/C system. With refrigerant stored in the recovery/recycling system, A/C system can be opened without polluting atmosphere.