TB20 MAINTENANCE MANUAL 21 AIR CONDITIONING TB20飞机维护手册 21 空调(24)

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3 - Charge system.
 I. /
-=    
 0 0   
Zi 0,0,-.....,,
I %
i
i ALMOST
NO REFRIGERANT
- No cooling action.
-A lot of bubbles or something like mist appears
110 in sight glass. - Serious refrigerant leak. Stop compressor immediatly.
1 - Leak test.
2 - Discharge system.
3 i RR ee pp laai cr el e reek c( es )i v. e r / drier if
bubbles persist.
5 - Check oil level.
6 - Recharge system.
 0 0   
 _   
it •1
IN II FAULTY
(6 EXPANSION VALVE
- Slight cooling.
- Sweating or frosted expansion valve outlet. - Expansion valve restricts frgeranow.
refrigerant
i t fl
- Expansion valve is clogged. - Expansion valve is inoperative.
-Valve stuck closed. -Temperature control/sensor has lost charge. 1 - Discharge system.
2 - Replace expansion valve.
3 - Check oil level.
4 - Recharge system.
 0 0   
    

Performance test - Diagnoses chart
Table 502 (1/4)
 
CONDITION PROBABLE
CAUSE CORRECTIVE
ACTION
/ /-----
I ..-N
' /) FAULTY
li) EXPANSION VALVE
- Insufficient cooling.
- Sweated suction line. - Expansion valve allows too refrigerant through evaporator. Check valve for operation. If suction side does not show a pressure decrease, replace valve.
 0 0   
    
i
Z /--
r ....,‘  FAULTY EXPANSION VALVE
- No cooling.
- Sweating or frosted suction line.
(§)
- - Faulty expansion valve. 1 - Discharge system.
2 - Replace valve.
3 - Check oil level.
4 - Recharge system.
 0 0   
 _ -   
o ,..-.....N
( i
k ) 41) AIR IN SYSTEM
- Insufficient cooling.
- oScigchatsgiolansasl bsuhbobwl ess. -Air mixed with refrigerant in system. 1 - Discharge system. 32 -Replace Checkoilrelecveeivl.er I drier.
4 - Recharge system.
 0 0   
    

Performance test - Diagnoses chart
Table 502 (2/4)
ABAA
Validity : KEITH 21 55-00Page 505
(CA) AUG 01
 
CONDITION PROBABLE
CAUSE CORRECTIVE
ACTION
„-----,
d„,,-...s
t
IN i
= If i) MOISTURE
IN SYSTEM
- After operation for a while, pressure on suction side may show vacuum pressure reading. During this bcoenwdaitriomn., Adsiswchaarnrginegaoirf will
this, reading shows 6 psi (0.4 bar) vibrations. - Drier is saturated with moisture. Moisture has frozen at expansion valve. Refrigerant flow is
　
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