TB 9-2320-302-13&P-3
A/C SYSTEM MAINTENANCE - CONTINUED
0015 00
CHARGING
CAUTION
DO NOT charge the A/C system with liquid refrigerant through the compressor suction ports. This could
seriously damage the compressor.
NOTE
Charging should be performed at air temperatures of 70F (21C) and above. Changes in ambient air
temperature will affect the system's ability to take a charge and will vary gauge readings.
When adding a partial charge to the A/C system, if there is no evidence of air in the system and there are
no system leaks, it is not necessary to discharge and evacuate the A/C system.
Operating A/C system periodically during the off-season will lubricate the seals and reduce the possibil-
ity of refrigerant loss.
Up to 7 oz. (200 g) of refrigerant loss per year is considered normal.
Steps 1 through 3 only need to be performed if a partial charge is being done.
1.
Connect manifold gauge set (1) low-side hose (4) to suction (low) side of A/C compressor.
2.
Connect manifold gauge set (1) high-side hose (5) to discharge (high) side of A/C compressor.
1
8
5
6
437-200
4
0015 00-6