AirComm Corporation Airbus EC130 Cabin Air Conditioner Instructions for Continued Airworthiness User Manual

							 
AIR CONDITIONER SERVICE MANUAL EC130-200M-1 
Revision 6                                                                                                         Page 24 
14. RELAY PANEL & CIRCUIT BREAKER ASSEMBLY, EC130-200-1,-2 INSTALL 
 
Fig 4-14 View Looking inside RH equipment bay 
 
 
  
						

							 
AIR CONDITIONER SERVICE MANUAL EC130-200M-1 
Revision 6                                                                                                         Page 25 
15. RELAY PANEL & CIRCUIT BREAKER ASSEMBLY, EC130-202-1,-2 INSTALL 
 
Fig 4-15 View Looking inside RH equipment bay 
 
 
 K2K4K3K5
J1
BLOWER
MAINT
FWD
EVAP
10A
EVAP
AFT
20A
J2
GND
COMP
CLUTCH
COND
25A
A/CSW PNL
2A
K6
5A
K1  
						

							 
AIR CONDITIONER SERVICE MANUAL EC130-200M-1 
Revision 6                                                                                                         Page 26 
16. VENTILATION KIT, EC130-202-1,-2 INSTALLATION 
 
Fig 4-16 View Looking Forward, Transmission Deck 
 
 
 
  
						

							 
AIR CONDITIONER SERVICE MANUAL EC130-200M-1 
Revision 6                                                                                                         Page 27 
 
17. REFRIGERANT PLUMBING SCHEMATIC, EC130-200-1,-2 
 
Fig 4-17 Plumbing Schematic, EC130-200-1,-2 
 Installation 
 
  
						

							 
AIR CONDITIONER SERVICE MANUAL EC130-200M-1 
Revision 6                                                                                                         Page 28 
 
18. REFRIGERANT PLUMBING SCHEMATIC, EC130-202-1 thru -4 
 
Fig 4-18 Plumbing Schematic, EC130-202-1 thru -4 
  
  
						

							 
AIR CONDITIONER SERVICE MANUAL EC130-200M-1 
Revision 6                                                                                                         Page 29 
 
19. REFRIGERANT PLUMBING SCHEMATIC, EC130-202-5 thru -8 
 
Fig 4-19 Plumbing Schematic, EC130-202-5 thru –8 
 
  
						

							 
AIR CONDITIONER SERVICE MANUAL EC130-200M-1 
Revision 6                                                                                                         Page 30 
 
 
CHAPTER 5 
PLACARDS AND MARKINGS 
 
1. PLACARD AND MARKING INFORMATION 
 
System Charging Instruction Placard 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1.1 2.4 
NOTE: Newer placards do not include “Boulder, Colorado” 
and may include the use of Ultra PAG oil.  
						

							 
AIR CONDITIONER SERVICE MANUAL EC130-200M-1 
Revision 6                                                                                                         Page 31 
 
CHAPTER 6 
SERVICING 
 
1. SAFETY PRECAUTIONS 
 
CAUTION 
Refrigeration servicing should be performed by qualified personnel only! 
 
The refrigerant used in the air conditioning system is the environmentally safe HFC R134a. 
This refrigerant is non-explosive, non-flammable, non-corrosive, has practically no odor, and 
is heavier than air. Although R134a is classified as a safe refrigerant, certain precautions 
must be observed to protect the parts involved, and the person working on the system. 
 
Liquid R134a at normal atmospheric pressure and temperature evaporates so quickly that it 
tends to freeze anything that it contacts. Care must be taken to prevent any refrigerant from 
coming into contact with the skin or eyes. 
 
WARNING 
Always wear safety goggles when servicing any part of the refrigerant system. Should any 
liquid refrigerant contact the skin or eyes, seek medical attention immediately even if the 
irritation ceases. 
 
WARNING 
Never weld, use a flame-type leak detector, blow torch, solder, steam clean, bake on 
aircraft finish, or use excess amounts of heat on, or in the immediate area of refrigerant 
supply tank. 
 
2. SERVICING INFORMATION 
 
A. This system should be serviced by QUALIFIED PERSONNEL ONLY! 
 
B. A list of suggested servicing equipment is provided in section 5 below. 
 
C. Connect the service manifold and vacuum pump to the service ports located on the 
Aft Evaporator assembly on the right side of the transmission deck. 
 
D. Turn on the vacuum pump and open both valves to evacuate the system. When the 
pressure drops to 29.40 InHg (1.9 KgCm) moisture vaporizes and is drawn out of the 
system by the vacuum pump. Complete removal of moisture is important to prevent 
blockage of the expansion valves with ice. Leak check the system as described later 
in this chapter. 
NOTE 
Due to the drop in atmospheric pressure with an increase in altitude, the normal vacuum 
reading will drop approximately 1” InHg (1 KgCm) for each 1000 ft. (304.8 m) of altitude.  
						

							 
AIR CONDITIONER SERVICE MANUAL EC130-200M-1 
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E. After the system has been evacuated, turn off both manifold valves, and then turn 
the vacuum pump off. Allow a minimum of one hour to check for vacuum leaks (if 
the system will not hold a vacuum, the system has a fitting leak). It may be 
necessary to charge the system with one or two lbs (.45 to .86 Kg.) of refrigerant 
and conduct a leak check survey using an electronic leak detector.  
 
CAUTION 
IT IS MANDATORY THAT THE SYSTEM BE LEAK FREE TO INSURE TROUBLE FREE 
OPERATION. CONTINUOUS OPERATION OF THE SYSTEM WITH INSUFFICIENT 
CHARGE WILL RESULT IN REDUCED COMPRESSOR LIFE. 
 
F. After the system is proven to be leak free, the system should be evacuated for a 
minimum of ½ hour before being charged with HFC R134a. 
 
G. Charging the system with 2.4 lbs. (1.1 Kg.) of R134a refrigerant is the most accurate 
method of charging. This should be accomplished using the suggested servicing 
equipment called out in this chapter. 
 
H. If a charging station is unavailable, the following procedure should be followed. Add 
an initial refrigerant charge of 2.0 lbs (0.9 Kg.) then continue to add refrigerant until 
the evaporator outlet air temperature and system suction pressures reach a 
minimum. When adding the refrigerant after the initial charge, it should be done in 
increments of 0.2 lbs (.09 Kg.) and two minutes allowed to elapse before adding 
each additional 0.2 lbs. (.09 Kg.) refrigerant charge. The optimum charge occurs 
when evaporator outlet temperatures are at their lowest. Any additional refrigerant 
will cause the outlet air temperature to increase and system performance to be 
degraded.  
 
 
WARNING 
If the system is to be charged by operating the compressor it must be charged through the 
Lo (Blue fitting) pressure (suction) port ONLY! 
Do not open the Hi (Red fitting) pressure (discharge) valve while the system is operating! 
 
 
I. Test run the system after charging, to confirm the system is working properly. 
 
CAUTION 
When reclaiming refrigerant, be sure to note any oil that is removed from the system, and 
replace the lost oil before or during re-servicing. Reduced compressor life will result if the 
total system oil charge is not maintained. 
 
 
SYSTEM REFRIGERANT & OIL CHARGE 
System Description Refrigerant Charge Oil Charge 
EC130 Air Conditioner system 2.4 lbs. 1.1 kg. 8.0 fl oz. 238 ml. 
  
						

							 
AIR CONDITIONER SERVICE MANUAL EC130-200M-1 
Revision 6                                                                                                         Page 33 
 
3. LUBRICATION INFORMATION 
 
The total system oil charge is 8.0 fl oz. (238 ml.) of Double End Capped Polyalkylene Glycol 
(DEC PAG). The oil is initially contained within the compressor as shipped from the factory 
so no additional oil is required when installing a new system.  
 
If oil is spilled during installation / maintenance, or is lost due to a leak in the system, it is 
necessary to approximate the amount of lost oil and add this amount to the system. This oil, 
if required, should be added to the compressor discharge line prior to system charging. 
 
This system may be serviced with either Polyolester (POE) or Double End Capped 
Polyalkylene Glycol (DEC PAG).  Polyalkylene Glycol is preferred due to its superior 
lubricating properties and improved compressor service life.  There are several types of  
PAG available. Only the “Double End Capped” type is permissible in Air Comm Corporation 
air conditioning systems.  Double End Capped PAG oil is available from Air Comm 
Corporation in 8 ounce bottles (P/N ES94006-13).  Mixing of POE and PAG is acceptable.  
Disregard previous statements to the contrary. They referenced PAG oil that was not 
“Double End Capped”.  Current versions of compressors are designed to be operated using 
PAG oil.  Testing by Air Comm Corporation has shown that “Double End Capped” PAG is 
compatible with POE and can therefore be mixed. “Double End Capped” is a reference to 
the chemical structure of the molecule and not to the container. 
 
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). 
 
DEC PAG and POE oils are hygroscopic so they will absorb moisture if left open. Keep 
containers tightly capped when not in use and keep all system components capped while 
servicing system. 
 
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 and reduce the cooling capacity of the system.  
 
The following chart may be used to calculate the amount of oil to be added in case a 
component is being replaced with a new part.  
  
Component Oil Amount 
Compressor See Instructions  
Evaporator 1.0 oz. per evaporator 
Condenser 1.5 oz. 
Receiver Drier 1.5 oz. 
Hose - Vapor 1.0 oz. per 10 foot 
Hose – Liquid 1.0 oz. per 20 foot