MOONEY INTERNATIONAL CORPORATION
M20V SERVICE AND MAINTENANCE MANUAL
Page
Date
17
MAR 2017
Rev Date
-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.
-NOTE-
Observe blower wheel blade and verify leading
edge is in the direction of rotation.
F. Connect motor and resistor wiring as follows:
(1) CW ROTATION - Motor RED wire is spliced
into resistor ORANGE wire, using wire splice. Orange
wire runs straight through clamp. Motor black wire
(ground) and resistor red wire also run straight through
clamp (no splice).
G. Run all wires through wire clamp and secure
with mounting screw and washer.
H. Connect power leads to blower assembly and
test for proper operation.
I. Replace all ducting, shrouds, closures, etc. Unit
is ready for operation.
21-56-05 - EXPANSION VALVE REMOVAL AND
REPLACEMENT
The automatic expansion valve normally does not re-
quire replacement. However, in the unlikely event it
malfunctions or has a clogged inlet, the following pro-
cedures will apply:
1. VALVE REMOVAL
-CAUTION-
Eye and hand protection should be worn in
the event system is still under pressure. Cap
all open ports on system.
A. The refrigerant system charge must be re-
claimed and access to the expansion valves must be
achieved.
B. Remove valve inlet tubing and remove valve
from coil header tube.
C. Inspect valve inlet for contamination and clean
as required. If no contamination is noted, valve should
be replaced if operation was erratic prior to removal.
-CAUTION-
Do not adjust internal spring setting or valve
will not operate correctly.
D. Inspect valve internal works to verify that no
contamination exists in the seat or orifice. Clean and
purge as necessary.
2. VALVE REPLACEMENT
A. Set new valve adjustment screw to same posi-
tion as failed valve.
B. Apply thread sealant to valve inlet and outlet
port threads (sparingly) and apply a very small amount
of refrigerant oil to both valve port flare surfaces.
-NOTE-
Do not put oil on fitting threads. Apply thread
sealant sparingly to male fitting threads staying
clear of first 2- 3 threads.
C. Install valve in coil header and position as nec-
essary. Tighten connection to 190- 195 in. lbs.
-CAUTION-
Use backup wrench during tightening and do
not over- torque “B” nut.
D. Connect valve inlet port tubing and tighten.
E. Leak c
heck, evacuate and charge system per
Sections 21-51-00 & 21-52-00.
F. Operate system and verify valve is performing
correctly
. Adjust valve, if necessary per Section
21-53-00.
21-56-05
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