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CHARGING THE A/C SYSTEM
The proper method for charging refrigerant into a R-
134a system is to first, recover all of the refrigerant
from the system. The charging refrigerant should
then be weighed on a scale to ensure the proper
amount is charged into the system. Most recovery
units include a scale within the apparatus, thus mak-
ing it very easy to charge the correct amount every
time. If equipment such as this is not available, a
common scale can be used to determine the weight
of charge. Simply weigh the charging tank, subtract
the weight of the proper charge, and charge the sys-
tem until the difference is shown on the scale. On
certain types of equipment, it is also possible to add
any necessary lubricant when charging the system.
If a scale is not used when charging R-134a into a
system, it is difficult to tell if the correct charge has
been achieved. The sight glass can provide some
indication, but it is not a reliable tool for determining
proper charge.
N04031 10/06
1. Charge the A/C system with 3.4 kg (7.4 lbs) of
R-134a refrigerant.
NOTE: Charging is to be performed with the engine
and compressor operating. Charge the A/C system
through the low side service port. Trucks equipped
with accumulators may charge the refrigerant as a
liquid or as a vapor.
2. Check the system for leaks. Refer to System
Leak Testing.
3. If no leaks are found, verify the system's cooling
capacity meets requirements. Refer to System
Performance Testing.
Operator Comfort
N4-37
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