AirComm Corporation Airbus EC120 Cabin Air Conditioner Instructions for Continued Airworthiness User Manual

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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INSTALLATION / REPLACEMENT 
 
A. Locate the evaporator assembly on the transmission deck. Install and torque the (6) 
six AN3-3A mounting screws. 
 
B. Mate the molex connector. 
 
C. Make the refrigerant line connections and torque the fittings per the specifications on 
p.35. 
CAUTION 
Always use a backup wrench when removing or installing refrigerant line fittings. 
 
 
B. Recharge the refrigerant per the service instructions on Page 27....

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8. Removal, installation / replacement of the condenser scoop assembly 
 
 
REMOVAL 
 
CAUTION 
It is recommended that the battery and external power be disconnected before starting work. 
 
A. Remove the AN3-3A screws that attach the EC120-7007-1 Condenser Scoop Assembly to 
the lower contour of the belly panel. This will allow the Condenser Scoop Assembly to pivot 
on the forward hinged support plate. 
 
CAUTION 
Be sure to support this...

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9. Removal, Installation / Replacement of Condenser Assembly with 
deployable scoop 
 
REMOVAL 
 
A. Remove the Condenser Scoop Assembly EC120-7007-1 per section 8, p.42. 
 
B. Discharge the refrigerant from the system. Instructions for servicing the system are 
found in Chapter 6 Servicing. 
 
CAUTION 
Refrigerant servicing should be performed by qualified personnel only! 
 
CAUTION 
It is recommended that the battery and external...

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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10.  Removal, Installation / Replacement of Condenser Assembly with fixed 
Grille Intake 
 
REMOVAL 
 
A. Remove the Outlet Screen EC120-7012-1. 
 
B. Discharge the refrigerant from the system. Instructions for servicing the system are 
found in Chapter 6 Servicing. 
 
CAUTION 
Refrigerant servicing should be performed by qualified personnel only! 
 
CAUTION 
It is recommended that the battery and external power be disconnected before...

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11. Removal and replacement of condenser blower motor & fan assembly for 
deployable air scoop configuration 
 
REMOVAL 
CAUTION 
It is recommended that the battery and external power be disconnected before starting work. 
 
A. Remove the AN3-3A Bolts that attach the EC120-7007-1 Blower assembly to the 
lower contour of the belly panel. This will allow the condenser scoop assembly to 
pivot on the forward hinged support plate. 
 
CAUTION...

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CAUTION 
Refrigerant servicing should be performed by qualified personnel only! 
 
C. Disconnect refrigerant lines from both sides of the receiver drier connection fittings. 
 
CAUTION 
Always use a backup wrench when removing or installing refrigerant line fittings. 
 
D. Loosen the retaining clamp holding the receiver drier bottle to the support bracket. 
 
E. Remove the receiver drier bottle. 
 
INSTALLATION / REPLACEMENT 
 
A. Locate...

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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INSTALLATION / REPLACEMENT 
 
A. Install the binary pressure switch on the Schrader valve and tighten. 
 
B. Mate the electrical connector to the switch. 
 
 
 
14.  Removal, Installation/ Replacement of By-Pass Valve Assembly 
 
REMOVAL 
 
A. Access the By-pass Valve. Refer to plumbing schematics Figures 8.9 & 8.10. The 
valve is located near the Aft Evaporator on the transmission deck. 
 
B. Discharge the refrigerant from the system....

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AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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CHAPTER 8 
TROUBLESHOOTING 
1. System Troubleshooting 
 
 
Prior to troubleshooting a defective system, it is advisable to conduct a visual 
inspection for general condition and obvious signs of damage or failure. 
 
The following matrix lists the easiest checks and the most likely problems. 
 
Problem Probable Cause Corrective Action 
System not Cooling 
 
(Evaporator blowers still operating) 
System is low or empty of 
refrigerant...

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Problem Probable Cause Corrective Action 
System not cooling 
(Evaporator blowers not operating) 
Forward and aft evaporator blower 
motor(s) 
Check for power to the motor(s), 
and for the free movement of the 
blower wheel; if the motor shaft 
does not turn smoothly the motor 
must be replaced 
Loss of cooling limited to one 
evaporator 
Expansion valve malfunction If cooling is lost in only one of the 
evaporators, and the blowers...