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

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
Revision 5 Page 31 
When  reclaiming  refrigerant,  be  sure  to  measure  and  note  any  oil that  is  removed  from 
the  system.  If  a  measurement  is  not  available  use  1.5  oz.  as  the  estimated  loss.  
Replace  any  lost  oil  before  or  during  re-servicing.  Reduced  compressor  life  will  result  if 
the total system oil charge is not maintained. 
 
Make  note  of  any  oil  lost  due  to  spillage  or  leaks  during  time  of  installation...

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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5. System Leak Check 
 
A. It is important to identify and eliminate refrigerant leaks at system connections to ensure 
trouble free operation of the air conditioning system. 
 
A new or empty system can be pressurized with R134a at 50 psi (3.5 kg-cm) to conduct 
a  leak  survey. Do  not  pressurize  the  system  with  compressed  air. Compressed  air  will 
introduce moisture into the system, which will degrade the operation of the system....

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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B. Lubricant: This  system  may  be  serviced  with  either  Polyolester  (POE)  or  Double  End 
Capped Polyalkylene Glycol (DEC PAG). 
 
C. O-Rings: This  system  utilizes  the  refrigerant  HFC  R134a.  Consequently,  the  system 
must  also  utilize  Highly  Saturated  Nitrile  (HSN O-Rings)  the  insert O-Ring fittings  (as 
previously  described  in  this  manual)  require  the  use  of  Green  HSN O-Rings  while  the 
TORQ  LOK®...

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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8. Suggested Spares List 
 
Item                    Part Number 
 
Blower Motor – Aft & Forward Evaporator [all models]                ES61072-1 
 
Blower Motor – Condenser, pre-Aug 2014 [deployable scoop intake]               ES61136-1 
Blower Motor – Condenser, post-Aug 2014 [fixed grille]                                    ES61082-3 
 
Compressor Assembly             EC120-3010-1  
 
Compressor Drive Belt                     7335...

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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CHAPTER 7 
STANDARD PRACTICES AND INFORMATION 
1. Fitting Torque Procedures and Values 
 
INSERT O-RING FITTINGS    TORK-LOK® FITTINGS 
 
 
 
Apply a thin coating of refrigerant oil to O-Ring and Female side of fitting. 
Confirm there is no damage (nicks, dirt, etc.) on fittings. 
Slide B-nut back away from the end of the tube so you can see the O-Ring as you slide 
the fitting together. 
 
Be careful not to pinch O-Ring during assembly....

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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Once  the  fittings  have  been  checked  and  are  found  to  be  free  of  leaks,  torque  seal  as 
appropriate. 
 
 
2. Removal, Replacement & Adjustment of Compressor Drive Belt 
 
REMOVAL 
 
 A. It is necessary to access the transmission compartment to remove, replace, or adjust 
the Compressor Drive Belt. 
 
B. Cut safety wire on the Compressor Belt Tensioning Link and the Belt Tensioning link 
Jam Nuts, and loosen the respective Jam...

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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ADJUSTMENT 
 
NOTE 
Proper belt tension is important to insure a long belt service life and to avoid excessive 
loads on the compressor, and bearing assemblies. 
 
A. The correct belt tension for the belt is 2.6 lbs. (1.2 kg.) This can be achieved with the 
aid of a belt tensioning tool (Kent-Moore® BT-33-73F Belt Tension Gauge or 
Equivalent). 
(This is the preferred method of obtaining proper belt tensioning). 
 
B. An alternate method...

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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D. Remove the attaching hardware from the top of the belt tensioning link and the 
compressor mount assembly. Remove the mounting bolt that attach the compressor 
body to the top of the compressor mount, and remove compressor assembly. 
 
CAUTION 
Before removing the compressor attaching hardware it is necessary to seek assistance in 
supporting the compressor, due to the weight and position of this component. Failure to do 
so may result...

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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C. Remove the (6) six NASM21262-29 Bolts that retain the EC120-3500-1 Drive Pulley 
to the tail rotor driveshaft. 
 
 
CAUTION 
During the removal of the Compressor Drive Pulley, care should be taken not to damage the 
driveshaft, or other drive train components. 
 
 
 
INSTALLATION / REPLACEMENT 
 
A. Install the Compressor Drive Pulley EC120-3500-1 on the tail rotor Driveshaft, by 
placing the pulley tightly against the face of the tail...

AIR CONDITIONER SERVICE MANUAL EC120-200M-1 
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INSTALLATION / REPLACEMENT 
 
A. Locate the evaporator assembly into its mounting location. Install the mounting 
hardware through the 4 mounting brackets and tighten. 
 
B. Install the ducting, drain line, and electrical connections. 
 
C. Replace all fitting o-rings and torque the refrigerant line connections per the 
specifications on p.35  
CAUTION 
Always use a backup wrench when removing, or installing refrigerant line fittings....