AirComm Corporation Bell 407 Air Conditioner Instructions for Continued Airworthiness User Manual

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
Revision 11  Page 44 
 
3. REMOVAL,  REPLACEMENT  &  ADJUSTMENT  OF  COMPRESSOR  DRIVE 
BELT 
 
REMOVAL 
A. It  is  necessary  to  access  the  engine  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 Nut(s). 
 
C. Before attempting to adjust the drive belt tension, ensure that the compressor...

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
Revision 11  Page 45 
Tension  Gauge  or  Equivalent). (This  is  the  preferred  method  of  obtaining 
proper belt tensioning). 
 
B. An  alternate  method  is  to  observe  a  .1”  (2.5  mm)  belt  deflection  when  3  lbs. 
(1.3 kg.) of force is applied at the midpoint of the belt.  
 
 
Tail rotor drive shaft pulley 
 
 
         Compressor drive pulley 
 
 
 
 
 
 
NOTE 
The belt tension should be checked, and re-adjusted, if necessary after the...

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
Revision 11  Page 46 
 
INSTALLATION / REPLACEMENT 
A. Locate  the  compressor  on  the  mount and  install  fasteners.  Torque  attaching 
hardware to 80 to 100 inch lbs. (9.04 – 11.30 Nm).  
 
B. Replace the O-rings on the refrigerant hoses, and re-connect the hoses to the 
compressor housing. Torque the  #10  hose fitting  to  50 – 55  inch  lbs. (5.7-6.3 
Nm). and torque the #8 hose fitting to 40 – 45 inch lbs. (4.6-5.1 Nm). 
 
C. Re-install  the  belt...

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
Revision 11  Page 47 
C. Remove  the  safety  wire  from  the  (4)  four  S-3532EC-11  Bolts  that  retain 
the  S-3532EC-5  Drive  Ring  to  the  S-3532EC-4  Pulley,  and  remove 
retaining bolts and Drive Ring. 
 
D. Remove  the  S-3532EC-4  Pulley  using  a  .257  Dia. X  .13  Deep  Spanner 
Wrench, utilizing one of the (4) four holes on the pulley body. 
 
NOTE 
Removal of the pulley is done by turning the pulley Counter Clockwise. (Facing the rear 
of...

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
Revision 11  Page 48 
CAUTION 
Always ensure that the Drive Ring is installed with the flanged portion facing aft, and a 
minimum clearance of .05 inch between the Drive Ring and the Driveshaft Coupler. 
 
NOTE 
Alignment of the (4) four holes in the Drive Ring that match those in the Compressor 
Drive Pulley is accomplished by a “trial and error” method of placing the Drive Ring on 
to the Driveshaft spline to check for hole alignment. Several rotations...

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
Revision 11  Page 49 
 
6. REMOVAL,  INSTALLATION  /  REPLACEMENT OF  FORWARD 
EVAPORATOR ASSEMBLY 
 
 REMOVAL 
A. It will be necessary to evacuate (discharge) the refrigerant from the system to 
remove or replace the forward evaporator assembly. Instructions for servicing 
of the system are found in CHAPTER 6 Servicing. 
 
B. Using  your  fingers,  gently  remove  Temperature  Control  Capillary  Tube  from 
Evaporator Fins by pulling straight out....

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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B. Recharge the refrigerant per the servicing instructions on Page 31. 
 
CAUTION 
Refrigerant servicing should be performed by qualified personnel only. 
 
NOTE 
An electronic leak detector should be used any time a component is replaced or the 
system has been opened, to ensure trouble free operation of the air conditioner system. 
 
7. REMOVAL,  INSTALLATION  /  REPLACEMENT  OF  AFT  EVAPORATOR 
ASSEMBLY 
 
 REMOVAL 
A. Remove the...

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
Revision 11  Page 51 
 
CAUTION 
Always use a backup wrench when removing or installing refrigerant line fittings. 
 
8. REMOVAL,  INSTALLATION  /  REPLACEMENT  OF  CONDENSER 
ASSEMBLY 
 
 REMOVAL 
A. It  is  necessary  to  remove  the  Condenser  Scoop  Assembly  S-7062EC-1 prior 
to  removing  the  Condenser  Assembly.  See  Page 54 for  the  removal,  and 
installation of the Condenser Scoop Assembly. 
 
B. It will be necessary to evacuate (discharge)...

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
Revision 11  Page 52 
 
INSTALLATION / REPLACEMENT 
A. Install  the  condenser assemblies  and  the  mounting  hardware.  Torque  all 
attaching hardware to 50 – 70 inch lbs. (5.7-8.0 Nm), and replace all O-rings. 
 
B. Attach and torque the refrigerant lines. Mate the blower electrical connector. 
 
C. Recharge the refrigerant per the servicing instructions on Page 31 
 
CAUTION 
Refrigerant servicing should be performed by qualified personnel only....

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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INSTALLATION / REPLACEMENT 
A. Install  the  receiver  drier  bottle into  the retaining  clamp.  Replace  all  O-rings 
and torque plumbing lines to the bottle. 
 
NOTE 
Never reuse a receiver drier bottle, and keep new receiver drier bottles capped 
until just prior to their installation. 
 
B. Recharge the refrigerant per the servicing instructions on Page 31. 
 
CAUTION 
Refrigerant servicing should be performed by qualified...