MOONEY INTERNATIONAL CORPORATION
M20V SERVICE AND MAINTENANCE MANUAL
Page
Date
16
MAR 2017
Rev Date
3. Tighten mounting hardware (temporarily).
4. Verify alignment of belt on all pulleys and align per
Section 21-54-03, if required.
5. Loosen compressor mounting nuts (2 each); pull
bolts
out enough to install belt guard per Section
21-54-02.
6. Connect clutch wiring.
7. Tighten belt guard/compressor mounting hard-
ware per Section 25-54-02, 4.
-CAUTION-
New compressor is supplied with 10 PSIG
nitrogen pressure. Remove caps and vent
slowly.
8. Remove compressor suction and discharge fitting
caps and connect system hoses.
-NOTE-
Lightly apply R- 134a refrigerant oil (RL- 100S) on
fitting o- ring and at contact surface between
tube bead and jam nut. Apply a small amount of
thread sealant to male fitting threads (stay clear
of first 2- 3 threads).
9. Tighten o- ring fitting nuts to 150- 200 in. lbs.
-CAUTION-
DO NOT OVERTORQUE
10. Connect R- 134a service gauges to unit suction
and discharge service ports.
11.
Leak c
heck system per Section 21-51-00 as re-
quired.
12.
Charge sy
stem per Section 21-52-00 as re-
quired.
13. Operate system to verify compressor operation
and system performance.
-NOTE-
If failed compressor contaminated system and
system was cleaned and purged, additional re-
frigerant oil may be required. If failed compres-
sor did not contaminate system, no additional oil
is required since a new compressor contains the
required charge. In either case, the receiver- dry-
er must be replaced. Oil may be added (max. 3.4
oz.) to compressor from a port on back of com-
pressor if compressor is not installed. Refriger-
ant oil may be added to compressor suction port
if compressor is already installed in aircraft.
21-55-05 - COMPRESSOR OIL LEVEL CHECK
When replacing the failed compressor containing un-
contaminated oil with a new compressor, use the fol-
lowing procedure to add the required oil to the system.
-CAUTION-
Only an E.S.I. approved oil may be used in
this type of compressor.
Do not overfill compressor with oil or system
performance will be affected.
1. Drain and measure oil from the failed compressor.
2. Drain oil from the new compressor in a clean con-
tainer for reuse.
3. Measure an amount of new oil equal to the amount
drained from the used compressor and pour it into the
new compressor.
21-56-00 - EVAPORATOR MODULE ASSEMBLY
INSPECTION AND MAINTENANCE PROCEDURE
Only field serviceable high inspection or maintenance
components will be addressed in the evaporator mod-
ule section.
21-56-01 - EVAPORATOR COIL INSPECTION
The evaporator coil must be inspected every 500- 800
operating hours for excessive lint and/or other contami-
nation in the coil fins. Clean as required by using a vac-
uum or low pressure purge source. Bent coil fins must
be combed to straighten.
21-56-02 - CONDENSATE DRAIN AND TUBING
INSPECTION
Verify that the evaporator condensate drain and asso-
ciated tubing is not blocked or tubing kinked. Clean and
re- route tubing as necessary.
21-56-03 - COOL AIR DUCTING INSPECTION
Cool air ducting from the evaporator blower should be
checked to assure that no excessive air loss is
experienced due to loose connections, cracked or
kinked hose. Repair as necessary.
21-56-04 - EVAPORATOR MODULE BLOWER
MOTOR REMOVAL
The evaporator module blower motor is a low cost item
that does not contain replaceable brushes. Therefore,
it is recommended that the motor be replaced rather
than repaired.
1. MOTOR REMOVAL
A. Verify all power to unit is OFF and all shrouds,
enclosures, etc. are removed from around the module/
blower assembly.
B. Disconnect power leads to motor.
-NOTE-
Blower motor is a permanent magnet type and
therefore may be wired to rotate either CW or
CCW. It is necessary that the motor wires and the
associated colors be observed before being dis-
connected.
C. Remove motor wire clamp and disconnect the
wire splice from the resistor wire.
21-55-05
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