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

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 31 
 
 
(Removal & Replacement of the compressor drive belt guards) 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Figure 
10
:  COMPRESSOR 
DRIVE ILLUSTRATION
 
412EP & 412HP Drive Pulley
 
412 & 412SP Drive Pulley
 
412 
-3500 & 412
-3504 Drive Pulley Belt Guard Installation
 
NOTE:
 Use aft coupling bolts for shaft...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 32 
 
 
(Removal & Replacement of the speed reducer pulley) 
 
Figure 11:  COMPRESSOR DRIVE ILLUSTRATION 
X-X Direction   

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 33 
 
 (Removal & replacement of the speed reducer bearing) 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Speed Reducer Pulley and Bearing Assembly
 
Figure 
12
:  COMPRESSOR DRIVE ILLUSTRATION
  

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 34 
4. REMOVAL, INSTALLATION / REPLACEMENT OF AIR CONDITIONER 
COMPRESSOR ASSEMBLY 
 
 REMOVAL 
 
A. See Removal, Replacement, and Adjustment of Compressor Drive Belt (pages 27-30) 
 prior to the removal of the air conditioner compressor assembly, following Steps A-D 
 under the Removal section. 
B. It will be necessary to evacuate (discharge) the refrigerant from the system to...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 35 
5. REMOVAL, INSTALLATION / REPLACEMENT OF THE AIR CONDITIONER 
COMPRESSOR DRIVE PULLEY FROM THE MAIN TRANSMISSION DRIVE SHAFT 
 
 REMOVAL 
 
A. See Removal, Replacement & Adjustment of Compressor Drive Belt (Page 27 and 28) 
 prior to the removal of the air conditioner drive shaft pulley. 
B. It should be noted that the air conditioner drive pulley is a two-piece assembly,...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 36 
B. Reconnect the ducting that attaches the forward evaporator to the forward blower 
 assemblies. 
 
CAUTION 
Refrigerant servicing should be performed by qualified personnel only. 
 (Removal & Replacement of the forward evaporator(s) assembly continued) 
 
CAUTION 
Always use a backup wrench when removing or installing refrigerant line fittings. 
 
C. Reconnect the...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 37 
 
 INSTALLATION / REPLACEMENT 
 
A. Install the aft evaporator assembly in the evaporator housing. 
B. Reconnect the drain tube to the bottom of the aft section of the aft evaporator housing. 
C. Reconnect the wires to the aft evaporator blower motors on the aft side of the evaporator 
 assembly. 
D. Reinstall the five (5) mounting bolts that attach the aft evaporator...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 38 
 
 INSTALLATION / REPLACEMENT 
 
A. Install the condenser assembly. 
B. Reinstall the eight (8) mounting bolts in the condenser assembly support legs. 
 
CAUTION 
Always use a backup wrench when removing or installing refrigerant lines. 
 
CAUTION 
Refrigerant servicing should be performed by qualified personnel only. 
 
C. Reinstall the refrigerant lines that connect...

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 39 
 
 INSTALLATION / REPLACEMENT 
 
NOTE 
Never reuse a receiver drier bottle, and keep new receiver drier bottles capped until just prior to 
their installation. 
 
A. Install the receiver drier bottle. 
B. Tighten the retaining clamp holding the receiver drier bottle to the support bracket. 
 
 CAUTION 
Refrigerant servicing should be performed by qualified personnel only....

                                                                      AIR CONDITIONER SERVICE MANUAL 412AC-210M 
Revision 7 Page 40 
 
11. REMOVAL, INSTALLATION / REPLACEMENT OF THE BY-PASS VALVE 
ASSEMBLY 
 
 REMOVAL 
 
A. Remove the forward transmission cowling to gain access to the by-pass valve assembly, 
 which is located on the aft side of the condenser assembly. 
B. It will be necessary to evacuate (discharge) the refrigerant from the system to remove or 
 replace the by-pass valve. Instructions...