MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Page
Date
12
2006
Rev Date
3. Adjust other expansion valve of evaporator that
has higher temperature by turning adjustment screw
IN, in 1/4 revolution increments.
NOTE:
Proper evaporator balancing should not result in
a change of the compressor suction pressure.
Verify system pressures are within values shown
in Section 21--52--03, 13.
4. Allow system to stabilize 2--5 minutes; recheck
evaporator outlet temperatures and repeat adjustment
procedure if necessary. Evaporator outlet tempera-
tures should be within 1--3
o
F of each other.
5. If evaporator outlet temperatures are equal and
suction pressure meets SECTION 21--52--03, 13, ser-
vicing is complete. If not, repeat SECTIONS 21--53--02
and 21--53--03.
-- CAUTION --
Eye and hand protection should be worn during
this operation.
6. Shut system and aircraft engine OFF. Replace all
shrouds, enclosures, ducting as required; remove
charging manifold gauges and hose assemblies.
21--53--03 -- EXPANSION VALVE ADJUSTMENT
The expansion valve adjustment shall be performed in
accordance with, but not limited to the following:
1. Verify that system leak check and refrigerant
charging has been performed and system is operating
at typical values as outlined in Section 21--52--03, 13.
2. Remove all shrouds, covers or enclosures which
prevent access to the evaporator expansion valve ad-
justment knob.
3. Verify R--134a manifold gauges and hoses are
connected to service ports; manifold gauge set valves
closed.
4. Open both valves on charging hose quick connect
fittings.
5. Remove expansion valves’ protective caps.
6. Verify that inlet to evaporator coil and blower duct-
ing are free of any contamination or restrictions which
could alter air flow.
7. Move aircraft to run--up area. Start aircraft engine.
8. Select ”MAX” on air conditioner switch. Run en-
gine at 1200--1800 RPM. Verify Alternator is charging.
9. Close cabin and baggage doors and allow system
to operate for 5 minutes.
10. Record compressor suction and discharge pres-
sures and evaporator air inlet and outlet temperatures.
NOTE:
Typical temperature difference of evaporator inlet
and outlet air is 25+/-- 5
o
F.
11. If suction pressure is above the values outlined in
Section 21--52--03, 13, the adjustment screw of the
evaporator expansion valve, which has lowest outlet
temperature, must be turned OUT, in 1/2 revolution in-
crements.
12. Adjust other expansion valve of evaporator that
has higher temperature by turning adjustment screw
IN, in 1/4 revolution increments.
13. Wait 2--5 minutes for valves to stabilize until de-
sired pressure is obtained, or air outlet temperature is
lowest possible. Re--adjust as necessary.
14. Monitor Engine temperatures and alternator out-
put.
15. If suction pressure is below the values outlined in
Section 21--52--03, 13, the adjustment screw of the
evaporator expansion valve, which has highest outlet
temperature, must be turned IN, in 1/2 revolution incre-
ments.
16. Adjust other expansion valve of evaporator that
has lower temperature by turning adjustment screw
OUT, in 1/4 revolution increments.
17. Operate system for 5--10 minutes after expan-
sion valve adjustment to verify setting. Evaporator out-
let temperatures should be within 1--3
o
F of each other.
18. System contains multiple evaporator modules.
See Section 21--53--02, to balance evaporator mod-
ules.
19. Replace all shrouds, covers and enclosures re-
moved in step 2.
21--54--00 -- COMPRESSOR DRIVE BELT INSPEC-
TION & MAINTENANCE PROCEDURE
When the compressor drive belt requires removal and
replacement, tension or alignment, the following proce-
dures will apply:
21--54--01 -- BELT REMOVAL PROCEDURE
1. Verify all aircraft or ground power is OFF.
2. Remove cowling to gain access to the compres-
sor.
3. Loosen jam nut on adjusting bolt of idler pulley.
4. Loosen slide nut slightly to allow slide to move up
and down.
5. Turn adjusting nut out far enough to allow belt re-
moval.
6. Remove belt from all three pulleys.
-- CAUTION --
Do not bend or twist the drive belt excessively
during removal or damage may result.
7. Inspect belt for cracks or damage and clean any oil
or other contamination from all pulleys and belt.
21--54--02 -- DRIVE BELT REPLACEMENT PROCE-
DURE
1. Verify belt size and part number (see Illustrated
Parts Catalog) before installing or damage may result.
2. Place new belt, or inspected and cleaned belt,
over compressor pulley, idler pulley, and drive pulley.
21--53--03
AUGUST 2010
Summary of Contents for M20TN
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