AirComm Corporation Bell 429 Air Conditioning 429EC200M1Rev9 User Manual

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
Revision 9 Page 43 
 
NOTE 
Maintaining the correct amount of refrigerant and refrigerant oil in the system is critical 
for ensuring the long life of the compressor. 
 
The quantity of lubrication in the system is critical. If too little lubrication is in the system 
the compressor life may be reduced. No other component in the A/C system requires 
lubrication. Too much lubricant in the system will retard heat transfer in the evaporator 
and condenser coils...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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(Example: Robinair, Snap-on, or equivalent) 
 
6. Consumable Materials 
 
A. Refrigerant:  This  system  is  to  be  charged  with  Dupont (or  equivalent) HFC  R134a 
refrigerant. 
 
Lubricant: Lubricant:  Ultra  PAG  refrigerant  oil.  See  Lubrication  information,  pg.  
39. 
 
B. O-Rings: This  system  utilizes  the  refrigerant  HFC  R134a.  Consequently,  the  system 
must  also  utilize  Highly  Saturated  Nitrile  (HSN O-Rings)...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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 HSN O-Rings; Insert Type (Green) 
 # 6 O-Ring ES44010-2 
 # 8 O-Ring ES44010-3 
 # 10 O-Ring ES44010-4 
 
 HSN O-Rings; TORQ LOK® Type (Black) 
 #6 O-Ring ES44012-2 
 #8 O-Ring ES44012-3 
 #10 O-Ring ES44012-4 
 
  

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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CHAPTER 7 
STANDARD PRACTICES AND INFORMATION 
1. Fitting Torque Procedures and 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 
the fitting together. 
 
Be careful not to pinch O-Ring during assembly....

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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Once the system is charged, check each fitting with an electronic leak detector. 
An electronic leak detector is the only reliable method of checking for refrigerant leaks. 
Once  the  fittings  have  been  checked  and  are  found  to  be  free  of  leaks,  torque  seal  as 
appropriate. 
2. Removal and Replacement of Forward Evaporator Blower Motor Assembly 
 
Removal 
 
CAUTION 
It  is  recommended that  battery  and  external  power  be...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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3. Removal and Replacement of Forward Evaporator Assembly 
 
Removal 
 
A. It  will  be  necessary  to  discharge  (evacuate)  refrigerant  from  the  system  to 
remove  or  replace  the  forward  evaporator  assembly.  Instructions  on  servicing 
and evacuating this system can be found in Chapter 6 of this manual. 
 
CAUTION 
Refrigerant servicing should be performed by qualified personnel only. 
 
CAUTION 
It  is  recommended that...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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CAUTION 
Refrigerant servicing should be performed by qualified personnel only. 
 
A. Install evaporator assembly in the appropriate location. 
 
B. Ensure  the evaporator assembly  is  supported  while  installing  attachment 
hardware. 
 
C. Reinstall  attachment  hardware  to  attach  the  forward  evaporator  assembly  on to 
the forward and aft side of the evaporator. 
 
D. Reconnect Molex connector located on evaporator motor...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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E. Gain access to the lower drive pulley in accordance with BELL service manual to 
remove belt from the hydraulic pump quill pulley. 
 
Installation/Replacement 
 
A. Install the drive belt on the compressor pulley and hydraulic pump quill pulley. 
 
CAUTION 
Care should be taken to ensure that the new belt is not damaged (nicked 
or cut) during installation. 
 
B. Adjust belt tension (See adjustment below). 
 
C. Tighten the belt...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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5. Removal and Replacement of Compressor Assembly 
 
Removal 
 
A. It  is  necessary  to  access  the  upper  transmission  compartment  to  remove, 
replace, the compressor assembly. 
 
B. See Removal, Replacement, & Adjustment of Compressor Drive Belt prior to the 
removal of the air conditioner compressor assembly. 
 
C. It  will  be  necessary  to  evacuate  (discharge)  the  refrigerant  from  the  system  to 
remove  and  replace...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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E. 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). 
 
F. Install the belt tension bolt and attaching hardware to the compressor, and torque 
to 160 to 190 inch lbs. (18.08 – 21.47 Nm). 
 
G. Adjust the belt adjustment per the procedure shown on page 41....