12-80 Air Conditioning System
12-81 Refrigerant Recovery and System Charging
NOTE
In the United States, only personnel with EPA certification under
Section 609 of the Clean Air Act may charge the system with
refrigerant or work on the refrigerant system once it has been
charged. Different requirements may apply in countries other
than the United States.
Automotive-style air conditioning service equipment, compatible with R134a refrigerant,
is required to recover and charge the system with refrigerant. This equipment is available
from many manufacturers in varying levels of automation and complexity. Minimum
components include a vacuum pump, pressure pump, refrigerant supply, scale to measure
refrigerant charge, pressure/vacuum gage, and appropriate lines and fittings.
Ensure that the technician performing the task is appropriately qualified.
A. Refrigerant Recovery
NOTE
If a leak or other service problem is encountered after system is
charged with refrigerant, refrigerant must be recovered before
work on system can proceed.
1. Remove tailcone cowling per § 53-23.
2. Automotive-style high- and low-side system service ports are located on G794
hose assemblies where they mount to the compressor assembly. Connect service
equipment to system quick-disconnect ports and recover refrigerant per equipment
manufacturer’s instructions.
B. System Charging
CAUTION
Do not overcharge system. Perform leak detection per Section
12-83 if a leak is suspected, then use correct charge.
1. Remove tailcone cowling per § 53-23.
2. Automotive-style high- and low-side system service ports are located on G794
hose assemblies where they mount to the compressor assembly. Connect service
equipment to system quick-disconnect ports.
3. Replace desiccant per § 12-82. Vacuum system, then charge with R134a
refrigerant per equipment manufacturer’s instructions. Correct charge is 2.25 lb
(36 oz) refrigerant.
4. Install tailcone cowling per § 53-23.
Page 12.18 Chapter 12 Servicing MAY 2015
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