TB 9-2320-302-13&P-3
A/C SYSTEM MAINTENANCE - CONTINUED
0015 00
CHARGING - CONTINUED
Table 1. A/C Sight Glass Check.
Sight Glass Appearance
Refrigerant Condition
Action Required
No Liquid
No refrigerant charge.
a. Charge the system with R-134a
refrigerant.
b.Ensure shutoff valves are open.
c. Ensure receiver/dryer
is
not
blocked.
Clear liquid or some bubbles appear
Good refrigerant charge.
System is normal.
only during cooling modes.
Bubbles in stream.
Refrigerant charge is low.
System requires refrigerant charge.
Table 2. High-Side/Low-Side Gauge Pressures at Ambient Temperature Cross-Reference.
Ambient Temperature F (C)
High-Side Pressure psi (kPa)
Low-Side Pressure psi (kPa)
61F (16C)
123 to 174 psi (850 to 1,200 kPa)
3 to 15 psi (20 to 100 kPa)
70F (2 C)
152 to 254 psi (1,050 to 1,750 kPa)
3 to 15 psi (20 to 100 kPa)
81F (27C)
181 to 276 psi (1,250 to 1,900 kPa)
3 to 15 psi (20 to 100 kPa)
90F (32C)
203 to 312 psi (1,400 to 2,150 kPa)
4 to 22 psi (30 to 150 kPa)
100F (38C)
232 to 334 psi (1,600 to 2,300 kPa)
4 to 29 psi (30 to 200 kPa)
109F (43C)
276 to 363 psi (1,900 to 2,500 kPa)
4 to 36 psi (30 to 250 kPa)
END OF WORK PACKAGE
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