AirComm Corporation Bell 412 Air Conditioner Instructions for Continued Airworthiness with Ground Cooling User Manual

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 21 
If a leak is detected at an O-ring fitting; check to ensure proper torque has been applied 
to the fitting. If the system continues to leak, reclaim the system of refrigerant, and install 
a new O-ring. NOTE: be sure that the O-ring is lubricated with refrigerant oil prior to its 
installation. 
 
A small amount of leakage (approximately one ounce per year) past the...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 22 
7. SUGGESTED SPARES LIST 
 
Item Part Number 
 
Blower Motor  Fwd Evaporator ES61064-10 
Aft Evaporator ES61060-2 
 
Compressor Assembly 412AC-3542-2 
 
Compressor Drive Belt (Upper 7305 (412HP/EP) 
7312 (412/412SP) 
 
Compressor Drive Belt (Lower) 7355 (412HP/EP) 
7345 (412/412SP) 
 
Receiver / Drier Bottle ES43032-1 
 
Hi/Lo Pressure Switch ES57010-1 
 
By-pass Valve...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 23 
CHAPTER 7 
STANDARD PRACTICES INFORMATION 
 
 
1. FITTING TORQUING PROCEDURES AND TORQUE VALUES 
 
INSERT O-RING FITTINGS TORQ 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...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 24 
Once the fittings have been checked and are found to be free of leaks, torque seal as 
appropriate. 
 
2. REMOVAL & REPLACEMENT OF THE CONDENSER BLOWER MOTOR & FAN 
ASSEMBLY 
 
 REMOVAL 
CAUTION 
It is recommended that the battery and external power be disconnected before starting work. 
 
A. Remove the upper transmission pylon cowling to gain access to the air conditioner...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 25 
 
 
CAUTION 
Do not attempt to remove the fan blade assembly from the motor. The fan blade is threaded to 
the motor armature shaft, and damage will occur if proper tooling is not available. 
 
F. Once the motor mounting bolts have been removed, the fan & motor can be removed 
as a complete assembly through the open condenser access panel in the rear of the 
condenser...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 26 
 
Figure 8:  ES73131 Fan & Motor Assembly 
 
INSTALLATION / REPLACEMENT 
 
A. Use the torque chart below for the re-installation of the blower mounting bolts. 
Torque each bolt in succession around the blower housing until all three torques 
have been achieved. 
 
B. Unpack the ES73131 Fan & Motor assembly to ready for installation. 
 
CAUTION 
Care should be taken not to...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 27 
J. Reinstall the upper transmission pylon cowling. 
 
Torque Chart 
 
Blower Part Number Torque Blower Mounting Bolts as Follows 
412AC-7058-16 1st Torque 2nd Torque 3rd Torque 
(ES73131) 30 in/lbs. 45 in/lbs. 60 in/lbs 
 
(Troubleshooting chart for ES73131 blower assembly is located in Chapter 7 of this manual.) 
 
* Contact the Air Comm Corporation Service Department for...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 28 
 
 
 INSTALLATION / REPLACEMENT 
 
CAUTION 
Before attempting to adjust the lower drive belt tension, ensure that the speed reducer 
mount attaching bolts have been loosened. 
 
NOTE 
To replace the lower drive belt it is necessary to disconnect the forward end of the main 
transmission drive shaft coupling. 
(See BHT Service Manual for Instructions) 
 
A. Replace the lower...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 29 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
NOTE 
The belt tension should be checked, and re-adjusted, if necessary after the first two hours of 
operation for a newly installed belt. 
 
 
 
Deflection should be 0.13” (3.3mm) 
Apply 6 lbs (2.7 kg) at midpoint 
4 lbs (1.8 kg) for used belts  

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 30 
 
 
 
 
Figure 9:  COMPRESSOR DRIVE ILLUSTRATION
NOTE: Use aft 
coupling bolts for shaft 
balance adjustment 
when A/C compressor 
pulley is installed.