Component Maintenance Manual
EFFECTIVITY: ALL
21-00-22
Page
7007
JULY 21, 2011
SUBTASK 21-00-22-40-002
9.3
Evaporator Module Assembly Procedures
(refer to Figure 10002):
9.3.1
Assembly of Expansion Valve
CAUTION
: APPLY THREAD SEALANT SPARINGLY TO MALE FITTING THREADS STAYING CLEAR OF
FIRST 2-3 THREADS.
9.3.1.1
Set new valve adjustment screw to same position as failed valve.
9.3.1.2
Using a wire brush and cleaning solvent, completely remove old thread sealant. Apply
a thin layer of thread sealant primer to fitting threads.
9.3.1.3
Apply 1-2 drops of thread sealant to threads of expansion valve and to evaporator
header nut threads.
CAUTION
: TAKE EXTREME CARE NOT TO GET REFRIGERANT OIL ON FITTING THREADS.
9.3.1.4
Apply thin film of refrigerant oil to expansion valve flare surface and a very small
amount to the O-rings to prevent damage.
9.3.1.5
Connect expansion valve to coil header fitting. Refer to table 1, Section 1 for torque
specifications.
9.3.1.6
Leak check per Testing and Fault Isolation, Section 3.5 and then evacuate and charge
system per Servicing, Section 13.
9.3.2
Assembly of Air Filter
9.3.2.1
Remove old Velcro from evaporator coil.
9.3.2.2
Apply new Velcro (hook side) along top and bottom of evaporator coil inlet.
9.3.2.3
Apply new Velcro (loop side) along top and bottom of filter.
9.3.2.4
Install new filter into position ensuring Velcro is securely mated.
9.3.3
Assembly of Evaporator Module Assembly
9.3.3.1
Refer to aircraft maintenance manual for installation of Evaporator Module Assembly.