39
SJ1044 TH, SJ1044 THS, SJ1056 TH, SJ1056 THS, SJ1256 THS
230790ABA
2.10 Air Conditioner Temperature/Pressure Chart
R-134a Temperature/Pressure Chart
Ambient Temperature °F (°C) Low Pressure Gauge High Pressure Gauge
65 °F (18 °C) 25-35 psi (172-241 kPa) 135-155 psi (931-1069 kPa)
70 °F (21 °C) 35-40 psi (241-276 kPa) 145-160 psi (1000-1103 kPa)
75 °F (24 °C) 35-45 psi (241-310 kPa) 150-170 psi (1034-1172 kPa)
80 °F (27 °C) 40-50 psi (276-345 kPa) 175-210 psi (1207-1448 kPa)
85 °F (29 °C) 45-55 psi (310-379 kPa) 225-250 psi (1551-1724 kPa)
90 °F (32 °C) 45-55 psi (310-379 kPa) 250-270 psi (1724-1862 kPa)
95 °F (35 °C) 50-55 psi (345-379 kPa) 275-300 psi (1896-2068 kPa)
100 °F (38 °C) 50-55 psi (345-379 kPa) 315-325 psi (2172-2241 kPa)
105 °F (41 °C) 50-55 psi (345-379 kPa) 330-335 psi (2275-2310 kPa)
110 °F (43 °C) 50-55 psi (345-379 kPa) 340-345 psi (2344-2379 kPa)
*It is illegal to vent R-134a refrigerant into the atmosphere.
Interpreting Pressure Readings
Low Pressure Gauge High Pressure Gauge Action Required
In Range In Range A/C working properly
Low Low Add refrigerant
Low High
Need service, possibly blockage of the
expansion valve or orifice tube
High Low
Need service, possibly faulty
compressor
High High System overcharged.*
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