Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
Copyright © 2017
ATA 21-00-23
P a g e
|
84
Revision 10
June 1, 2017
•
Hose adapter (1/2 in, male acme to ¼ female flare)
SUBTASK 21-00-23-60-001
13.2
Evacuating the system (R-134A):
NOTE
: The system must be evacuated for a minimum of 45 minutes to remove air and moisture which can
cause the system to have less than optimal performance.
13.2.1
Gain access to the Compressor Condenser Module (refer to the aircraft maintenance
manual for removal of access panels and other hardware that might need to be removed)
13.2.2
Verify that power is removed from aircraft. If it is not practical to remove aircraft power,
technician must pull and collar applicable circuit breakers.
13.2.3
If required perform leak check procedure.
13.2.4
Connect certified reclaim charging and recycle cart manifolds to system service ports.
13.2.5
Open both valves and reclaim and recycle the systems refrigerant charge (refer to the
reclaim equipment manufacturer’s instruction manual for recovery unit handling and
operation).Once the refrigerant is reclaimed and recycled apply vacuum on the system for
approximately 30 minutes. System vacuum should attain 25-27 in. hg. in 10 to 15 minutes.
Allow pump to hold a vacuum (29 to 30 in. hg.) for an additional15 minutes
CAUTION
: ANY CHANGE IN VACUUM PRESSURE OR FAILURE TO ACHIEVE A SYSTEM PRESSURE
OF 29 INCHES HG VACUUM INDICATES THE PRESENCE OF A PLUMBING LEAK. REPEAT LEAK
CHECK PROCEDURE AND LOCATE AND FIX ALL LEAKS.
CAUTION
: EXCESSIVE WATER AND/OR AIR IN THE SYSTEM WILL CAUSE PRESSURE TO RISE AND
EXPANSION VALVE TO FREEZE UP.
13.2.6
System in now ready for refrigerant charging.
SUBTASK 21-00-23-60-002
13.3
Charging the system (R-134A):
WARNING
: SYSTEM DAMAGE CAN OCCUR FROM OVERCHARGING OR UNDERCHARGING THE
SYSTEM TO THE SPECIFIED AMOUNT OF REFRIGERANT.
13.3.1
Gain access to the Compressor Condenser Module (refer to the aircraft maintenance
manual for removal of access panels and other hardware that might need to be removed)
13.3.2
Verify that power is removed from aircraft. If it is not practical to remove aircraft power,
technician must pull and collar applicable circuit breakers
