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

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
Revision 11  Page 64 
 
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 Solution 
System not Cooling 
(Evaporator blowers still operating) 
a. System is low or empty of 
refrigerant. 
 
a....

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
Revision 11  Page 65 
 
Problem Probable Cause Solution 
System not cooling 
(Evaporator blowers not operating) 
j. Forward and aft evaporator 
blower motor(s) 
j. 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, as per 
chapter 7. 
Loss of cooling limited to one 
evaporator. 
k. Expansion valve malfunction. k. If cooling is lost in only one of 
the...

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
Revision 11  Page 66 
 
 
Figure 27:  General Arrangement – Air Conditioning System Installation. 
 
407EC
-614 & 616
 
Evaporator Instl
 
407EC
-802 & 804
 
Electrical Instl
  

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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Figure 28:  Air Conditioning System Electrical Schematic (Dual Forward 
Evaporator System)  

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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Figure 29:  Electrical Schematic – Temperature Control Circuitry & Transient 
Suppression Circuitry / Wiring Schematic (Dual and Single Forward Evaporator Systems)  

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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Figure 30:  Refrigerant Plumbing Schematic (Dual Forward Evaporator System) 
Through 1st Quarter 2015  

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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Figure 31:  Refrigerant Plumbing Schematic (Dual Forward Evaporator System) 
After March 1, 2015 
 
    

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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Figure 32:  Air Conditioning System Electrical Schematic (Single Forward 
Evaporator System)  

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
Revision 11  Page 72 
 
 
Figure 33:  Refrigerant Plumbing Schematic (Single Forward Evaporator System)  

AIR CONDITIONER SERVICE MANUAL 407EC-200M-2 
 
 
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APPENDIX A 
Weight and Balance Information 
 
Weight breakdown – Bell 407 Air Conditioner System: 
 Ref. Drawings 407EC-201, 407EC-202, 407EC-203 
 
NOTE 
The weight change between the 407EC-201, 407EC-202, and the 407EC-
203 installations is negligible.  
 
Dwg 407EC-201-1 Single LH Fwd Evaporator with 407EC-620-1 Panasonic Motor Install 
Dwg 407EC-201-2 Dual Fwd Evaporator with 407EC-620-1 Panasonic Motor Install 
Dwg 407EC-201-3...