An R134a temperature‐pressure chart shows what the refrigerant temperature should be at a specific pressure. This can be helpful in A/C diagnosis. MVAC systems that are low on refrigerant will have: Low pressures in Evaporator (low side) and Condenser (high side)

NOTE: Values are just indicative; the proper refrigerant charge depends on the system design. R290 vs R134a/R404A R404A R290 R134a R290 R134a R600 R600a vs R134a 48% reduction 41% reduction 46% reduction FILTER DRYER Same as R404A / R134a system (XH-9) CAPILLARY Same as R404A / R134a or slightly longer (10-15%) EXPANSION VALVES Specifically to

performed in the presence of refrigeration oils. The results of sealed tube stability tests are available for CFC-12/ mineral oil combinations, which have shown long-term stability in contact with copper, steel, and aluminum in actual refrigeration systems. Polyalkylene glycol (PAG) and polyol ester (POE) lubricants are New with Freon™ 134a.

The total system oil capacity for many late model passenger car A/C systems is only about 4 ounces (120 ml). A low oil level can starve the compressor for oil and lead to compressor failure. CAUTION: Do NOT overfill the the A/C system with too much compressor oil. Too much oil can hurt cooling performance.

Compressor Calorimeter And System Drop In Tests With R-22 Alternatives By David S Godwin, Air-Conditioning & Refrigeration Institute (now AHRI) 18 March 1994 •AREP Results Led To Selection Of R134a, R404A, R407C & R410A In Various Applications •Higher Pressure Refrigerants Like R410A Performed Better In Actual Systems; Adoption In Efficiency

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155 1994-97 R134a 700 SP10 PAO 68 or PAG ISO 46 225-255 155 1,6/1,8/2,0 16V 1995-97 R134a 700 Dens Oil 8 PAO 68 or PAG ISO 46 260-320 155 1,9 Diesel 1993-97 R134a 700 UCON RL 488 PAO 68 or PAG ISO 150 236 156 1997-02 R134a 650 SP20 PAO 68 or PAG ISO 10 130 156 1,9 JTD 1997-02 R134a 650 SP20 PAO 68 or PAG ISO 10 130

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the system to protect against the effects of liquid or release of gas follow the instructions of the air-the refrigerant supplier identify the refrigerant in the system correctly before carrying out any work use approved equipment when maintaining or servicing the system ensure that everyone using the equipment or working on the system

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The system should be recovered, vacuumed (min 20 minutes) and charged. The gauges readings will depend on the ambient temperature. With the A/C turned OFF - On a cold day the pressure will be low, on a hot day the pressure will be high. The table below shows the comparison between temperature and pressure for R134a.

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