Mooney M20TN, Руководство по обслуживанию и ремонту

Страница: 161 / 1169

MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Page
Date
9
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
o
F
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
Flare)
21--52--00
AUGUST 2010