RJ150-30 / Operations and Maintenance Manual
Mobile Aircraft Air Conditioner
Trailer Mounted, Cool Mode Only
______________________________________________________________________________
JANUARY 20, 2004
SECTION 2 - 1
PAGE 19
H. Refrigerant Leak Repair:
Refrigerant leaks should be repaired as soon as they are discovered.
WARNING
USE EXTREME CAUTION WHEN USING AN OPEN FLAME SUCH AS A
SOLDERING TORCH OR WELDING EQUIPMENT IN THE INTERIOR OF THE
UNIT. NOTE THE LOCATION OF AND PROTECT FUEL DRAIN CAP, FUEL
LINES, ELECTRICAL WIRING BUNDLES, AND COMPONENTS NEAR THE
WORK AREA. USE HEAT-RESISTANT CLOTHS AND/OR OTHER PROTECTIVE
DEVICES TO PREVENT PERSONNEL INJURY OR DAMAGE TO EQUIPMENT.
ENSURE PROPER VENTILATION OF WORK AREA.
(1) Locate leak as described in
Refrigerant Leak Testing Procedure
,
paragraph 3.G. in this Section.
(2) Using a refrigeration recovery system compatible with the refrigerant in
use, pump refrigerant from the system and dispose.
(3) Replace filter-drier if necessary. Observe sight glass for moisture
indications. Refer to
Servicing The Filter-Drier
procedure, paragraph
3.L. in this Section.
(4) Repair leak. Use standard refrigeration system repair procedures to
remove and repair/replace the leaking/damaged component/piping
section. Protect nearby components from soldering flame as required.
(5) Reassemble and tighten any connections previously loosened.
(6) If the refrigeration plumbing system has been opened for repair, evacuate
the system previously open to a vacuum of 750 microns. Add refrigerant
until pressure within the system is at least 5 psig. Follow with dry nitrogen
to raise pressure to 150 psig.
(7) Open all previously closed valves.
(8) Perform a pressure check for leaks as previously discussed.
(9) If all leaks are repaired, perform
Evacuating the Refrigeration System
procedure, paragraph 3.I. in this Section.
I. Refrigerant System Evacuation
Anytime the compressor or refrigerant system is exposed to atmospheric air
for long periods of time, becomes contaminated, or requires removal of the
refrigerant charge, the system should be evacuated.
CAUTION
DO NOT START THE COMPRESSOR OR ATTEMPT TO OPERATE THE UNIT
WHILE SYSTEM IS UNDER HIGH VACUUM. SERIOUS DAMAGE TO THE
MOTOR WINDINGS IN THE COMPRESSOR MAY RESULT.
