AirComm Corporation Bell 429 Air Conditioning 429EC200M1Rev9 User Manual

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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Figure 25:  Aft Evaporator Drain Line Routing, Dual Evaporators 
 
 
 
 
 
Figure 26:  Aft Evaporator Drain Line Routing, Single Evaporators 
 
   

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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CHAPTER 5 
PLACARDS AND MARKINGS 
1. Placard and Marking Information 
 
 
All  placards  and  markings  associated  with  the  installation  of the  air conditioner  system  are  part 
of  the  type  design  of  this  helicopter.  Please  refer  to  the  Bell Helicopter  Instructions  for 
Continued Airworthiness Manual for placards and markings information. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
THIS AREA INTENTIONALLY LEFT BLANK 
 
  

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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CHAPTER 6 
SERVICING 
1. Safety Precautions 
 
CAUTION 
Refrigeration  servicing  should  be  performed  by  qualified  personnel  only. 
Check  all  local  and  federal  regulations  before  servicing  any  refrigerant 
system or storage device. 
 
The  refrigerant  used  in  the  air  conditioning  system  is  the  environmentally  safe  HFC 
R134a.  This  refrigerant  is  non-explosive,  non-flammable,  and  non-corrosive,  has...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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B. After  the  quick  disconnect  fittings  have  been  attached  to  the  servicing  ports,  tighten  the 
knobs on  the  back  of  the  fittings  to  engage  the Schrader  valves  located  inside  the 
charging ports. 
 
NOTE 
The Schrader valves inside the charging ports MUST be engaged to allow 
servicing of the air conditioner system. 
 
C. Connect  the  YELLOW  line  in  the  center  of  the  manifold  to  the  vacuum  pump.  Turn...

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CAUTION 
Operating  the  air  conditioning  system  with  a  low  refrigerant  charge  may 
cause severe damage to the compressor assembly. 
 
F. After  charging,  perform  a  test  run  to  ensure  proper  function  of  the  Air  Conditioning 
System. 
 
 
      2.2 Servicing Procedure without using a Service Cart 
A. The following tools & materials will be required: 
 1. R134a Manifold Gauge Set 
 2. 3 pound bottle of R134a 
 3....

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     the initial charge of 2.0 pounds to be added. This can be measured and tracked by  
     placing the bottle on a scale. 
 
  
 Note that the following step 8 is to be accomplished while the aircraft is running at 
 100%  and the air conditioning system is “ON”. Ensure that the High side (RED) 
 is closed at all times while system is operating.) 
 
 8. Add the remainder of the required charge in 0.2 lb. increments by opening the low...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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 Ambient temperature above 80OF: 
If  the  system  was  charged  by  refrigerant  weight  utilizing  a charging  station  and  the 
compressor  has  not  been  rotated  since  the  oil  and  refrigerant  were  added,  then 
manually rotate the compressor shaft clockwise a minimum of 10 full revolutions prior to 
running  the  compressor.  A  socket  or  wrench  applied  to  the  shaft nut  is  the 
recommended  method.  Always  rotate...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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Manually rotate the compressor shaft clockwise a minimum of 10 full revolutions prior to 
running  of  compressor.  A  socket  or  wrench  applied  to  the  shaft  nut  is  recommended 
method. Always rotate clockwise to insure against loosening the compressor shaft nut. 
Normal  suction  and  discharge  pressures  are  not  expected  under  these  conditions  and 
the  evaporators  may  be  cold  enough  to  cause  the  freeze  switch  to...

AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 
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     Remove the compressor from the aircraft, remove the drain plug and let the        
     compressor drain. Rotate the compressor and allow it to drain again. Repeat this      
     process until the compressor no longer has fluid inside. Do not use solvent to clean   
     the compressor. This will damage and possibly destroy the compressor. Add 8.0   
     ounces of Ultra PAG oil to the compressor (see section 3.0 below) and ensure the...

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Do not use Mineral oil in this system with R134a refrigerant. Do not use any refrigerant oil other 
than Double End Capped Polyalkylene Glycol (also known as “ULTRA PAG”) or Polyolester (also 
POE). 
 
Containers of DEC PAG or POE will absorb moisture if left open (hygroscopic). Keep containers 
tightly capped when not in use and keep all system components capped while servicing system. 
 
The oil charge is continuously circulated by the...