Mooney M20TN Service And Maintenance Manual Download

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MOONEY AVIATION COMPANY, INC.

M20TN SERVICE & MAINTENANCE MANUAL

Page

Date

2006

Rev Date

2. Remove, if required, any enclosures or access

doors to expose all tubing, hoses, fittings, etc. to the

compressor--condenser module/evaporator module.

3. Verify all aircraft and/or ground power is OFF.
4. Remove service port caps from A/C system. Ac-

cess to service ports is through Avionics Bay access

panel, LH side of Tailcone.

-- CAUTION --

Compressor and receiver--dehydrator may be

pressurized by manufacturer with Nitrogen gas.

Open factory installed caps & plugs carefully.

5. Close all manifold gauge valves and verify hose

connections are tight.

6. Connect R--134a refrigerant charging manifold.

R--134a service gauges contain quick--connect fittings

to minimize refrigerant loss. To install quick--connect,

push on firmly until locked (a ”clicking” sound is heard).

Hold grip ring and pull to remove quick--connect fit-

tings.

7. Connect charging manifold YELLOW hose to a

regulated dry nitrogen source.

NOTE:

An adapter is required to connect yellow charg-

ing hose to nitrogen source.

-- CAUTION --

Do not exceed 200 PSIG nitrogen pressure dur-

ing leak check procedure or damage to expan-

sion valve WILL result.

8. Regulate nitrogen source to a pressure of 200

PSIG maximum.

9. Remove all shrouds, panels, flooring and any oth-

er covering which prevents access to refrigerant fittings

or connections (if required).

10. Verify all plumbing connections are secure.

-- CAUTION --

During this procedure protective eye wear and

gloves should be worn to prevent operator injury.

11. Slowly open high pressure (RED) manifold valve

and allow system pressure to increase gradually until a

pressure of 200 PSIG is achieved. Allow time for sys-

tem pressure to equalize across expansion valves.

Note final system pressure.

12. Apply soapy leak check fluid to each connection

to locate leaks.

-- CAUTION --

Do not use any leak dye in R--134a system or

damage to system may result.

13. Use thread sealant on all male fitting threads

(sparingly), staying off the first two (2) threads near

sealing surface. A light coating of R--134a refrigerant

oil must be applied to flare and/or o--ring to prevent

metal galling/o--ring damage.

NOTE:

Do not apply oil to fitting threads.

-- CAUTION --

Do not over tighten plumbing connections.

Stripped threads or cracked flares may result.

14. Tighten joints as necessary to stop leaks.

-- CAUTION --

Vent system pressure very slowly to assure that

compressor oil is not vented with the nitrogen.

Do not PERMIT air to enter the system.

15. With system leak tight, turn nitrogen source OFF;

disconnect YELLOW charging hose from nitrogen

source and slowly release nitrogen pressure to zero.

16. Close manifold valve.
17. Replace all panels, doors and shrouds removed

for procedure.

21--52--00 -- SYSTEM R--134a EVACUATION AND

CHARGING PROCEDURE

Charging the refrigerant (R--134a) system is required

on new system installations, after an accidental line

break, component failure or when the system has ex-

cessive leaks. Due to the chemical nature of the refrig-

erant, every precaution must be taken to protect the

service person from accidental exposure to the refrig-

erant. See service precautions in Section 21--59--00.

Only R--134a refrigerant must be used or damage to

the system will result. Overcharging the system with re-

frigerant and/or oil will also result in system damage or

reduction in performance and service life. The com-

pressor is pre--charged with 5 oz. of ESTER RL--500S

air conditioner oil. No additional oil is required to be

added to a new system.

21--52--01 -- SPECIAL TOOLS AND/OR EQUIP-

MENT REQUIRED

The following tools and equipment are required to

charge the refrigerant system:

1. Small hand tools and socket set
2. Vacuum pump, air or electric (0--30 in. hg.)
3. Refrigerant, R--134a, 30 lb. cylinder
4. R--134a charging manifold, with gauges and

hoses

5. Thermometer, 0--150

6. Inspection mirror, adjustable
7. Service light or flashlight
8. Hand and eye protection
9. Shop towels
10. Refrigerant oil (Ester RL--500S))
11. Scale, 0--50 lbs.
12. Reclaim/recycle cart (R--134a)
13. Hose adapter (1/2 in. male Acme to 1/4 female

Mooney M20TN, Service And Maintenance Manual

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