AirComm Corporation Bell 429 Air Conditioning 429EC200M1Rev9 User Manual

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
Revision 9 Page 53 
E. Disconnect evaporator  blower  from  existing  aircraft  wiring  at  connector  located 
on aft portion of the aft evaporator assembly. 
 
F. Remove  and  retain  the  attaching  hardware  located  at  the  top  and  bottom  of 
evaporator assembly and remove from aircraft. 
 
Installation/Replacement 
 
A. Install the evaporator assembly in the appropriate location. 
 
B. Reinstall  the  attaching  hardware  at  the  top  and  the...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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CAUTION 
Refrigerant servicing should be performed by qualified personnel only. 
 
C. Disconnect the condenser blower assembly from the aircraft wiring at the existing 
connector. 
 
D. Disconnect  the  aircraft plumbing  from  the  condenser  assembly  and  cap  to 
prevent oil leakage. 
 
E. Remove  and  retain  the  attaching  hardware  located  on  top  and  bottom  of  the 
condenser assembly and remove from the aircraft....

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
Revision 9 Page 55 
 
8. Removal and Replacement of Condenser Blower Assembly 
 
Removal 
 
A. It  is  necessary  to  access  the  upper  transmission  compartment and  remove  the 
condenser  assembly to  remove,  replace,  the  condenser blower assembly. (See 
condenser assembly removal instructions in Paragraph 7 of this Chapter. 
 
B. Remove  and  retain  the  attaching  hardware  and  remove  the  condenser  blower 
assembly from the condenser assembly....

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
Revision 9 Page 56 
 
Installation/Replacement 
 
A. Install the receiver drier in the appropriate location. 
 
B. Reinstall  and  tighten  retaining  clamps  and  plumbing  lines  to  the  receiver  drier 
bottle. 
 
CAUTION 
Always use a backup wrench when removing, or installing refrigerant line 
fittings. 
 
C. Reconnect the refrigerant lines to the receiver drier bottle. 
 
D. Replace all O-Rings before connecting refrigerant plumbing to evaporator...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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E. De-pin  the  two  (2)  electrical  splices  connecting  the  bypass  valve  into  the  aircraft 
wiring. 
 
F. Remove the bypass valve from the aircraft. 
 
Installation/Replacement 
 
A. Install the bypass valve in the appropriate location. 
 
B. Re-pin  the two  (2)  electrical  splices  connecting  the  bypass  valve  to  the  aircraft 
wiring. 
 
C. Reinstall the two (2) screws on the bottom of the valve to hold it in place....

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
Revision 9 Page 58 
C. Unscrew switch from Schrader valve located on outlet tube from the compressor 
assembly. 
 
D. Remove binary switch. 
 
Installation/Replacement 
 
A. Install the binary switch in the appropriate location. 
 
NOTE 
Use  the  flats  provided  on  the  top  of  the switch  body  to  tighten,  do  not 
attempt to tighten or loosen the pressure switch by hand. 
 
B. Screw  the  binary  switch  from  the  Schrader  valve  located  on  the...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
Revision 9 Page 59 
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 Corrective Action 
System not Cooling 
 
(Evaporator blowers still operating) 
System is low or empty of 
refrigerant...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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Problem Probable Cause Corrective Action 
System not cooling 
(Evaporator blowers not operating) 
Forward and aft evaporator blower 
motor(s) 
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 
Loss of cooling limited to one 
evaporator 
Expansion valve malfunction If cooling is lost in only one of the 
evaporators, and the blowers...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
Revision 9 Page 61 
 
 
Figure 27
: 429EC
-8424
-1 Relay Panel (Pre 2011)
 
Applies to 429EC
-200 & 
-202 kits 
( S-6027EC Fwd Evap
) 
  

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
Revision 9 Page 62 
 
Figure 28
:  429EC
-8424
-2 Relay Panel 
 
Applies to 429EC
-200,
-202
,-204,
-206
 kits 
(S-602
9EC Fwd Evap
) 
 
Pre July 2015 
kits: 14 ga.
 
July 2015 & newer 
kits: 12
 ga.