MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Page
Date
16
2006
Rev Date
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.
NOTE:
At this point it is very important to observe the
wire colors and connections from the resistor
assembly. The resistor RED wire is the low speed
control and the ORANGE wire is the high speed.
-- CAUTION --
Do not damage plastic material or blower wheel.
E. Remove bracket/motor mounting screws and
with a putty knife slide between motor and plastic scroll
to cut the RTV foam sealant (if required).
F. Lift blower motor out of scroll assembly and re-
move blower wheel.
G. Discard blower motor since brush replacement
is not possible.
2. MOTOR REPLACEMENT
A. Replace the motor wheel on the new motor shaft
so the back of the wheel is 0.25 inches from motor
mounting flange. The set screw on the wheel hub must
be located on the motor shaft flat section. Use a thread
lock sealant and tighten set screw.
-- CAUTION --
During wheel installation, do not bend or smash
wheel.
B. Rotate blower wheel on motor shaft to check
wobble. Lightly apply a force on wheel O.D. to eliminate
any wobble as necessary.
C. Apply a small bead of RTV sealant (or gasket
seal if equipped) on the scroll and install the blower
wheel and motor with wires in a location near the resis-
tor wires and closest mounting screw.
-- CAUTION --
Do not over--torque mounting screws or thread
damage may result.
D. Install all mounting screws and tighten snugly
as required.
E. With access through the blower outlet, rotate
the blower wheel to assure that no rubbing exists.
21--55--05
AUGUST 2010
Summary of Contents for M20TN
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