AirComm Corporation Airbus EC145 Cabin Air Conditioner Instructions for Continued Airworthiness User Manual

							AIR CONDITIONER SERVICE MANUAL EC145-200M-1 
 
Revision 13  Page 5 
CHAPTER 0 
INTRODUCTION (continued) 
 
13. AIR CONDITIONER FEATURES (continued) 
 
The system is also equipped with a Binary switch, which is located on the air conditioner 
discharge line. This switch is designed to protect the system against over-pressure situations, or 
under-pressure in the event of refrigerant loss from the system. The switch also prevents the 
system from operating in low ambient temperatures below 50º F (10º C). 
  
The switch operating pressures are: 
 
Low Pressure Function: (P/N ES57178-1) 
Cut-out at 30 psig  
Cut-in at 50 psig  
 
High Pressure Function: (P/N ES57178-1) 
Cut-out at 335 psig  
Cut-in at 280 psig  
 
Low Pressure Function: (Alt. P/N ES57179-1) 
Cut-out at 30 psig  
Cut-in at 50 psig  
 
High Pressure Function: (Alt. P/N ES57179-1) 
Cut-out at 427 psig  
Cut-in at 341 psig  
 
14.  DESCRIPTION OF THE VAPOR CYCLE AIR CONDITIONER AND ITS INSTALLATION 
 
This section contains a general overview of a Vapor-cycle air conditioning system and 
how it functions. This type of system operates in a closed loop, in which the refrigerant absorbs 
heat from the cabin, and rejects it into the outside air. The refrigerant then returns to the cabin to 
repeat the cycle. The operation of the system is described below. 
 
Liquid refrigerant is contained in the receiver-drier under pressure from the compressor. 
The receiver-drier also filters the refrigerant through a material known as desiccant. The 
desiccant insures that the fluid leaving this component is free of any water or other contaminants. 
 
The low pressure (suction) line from the compressor is attached to the evaporator lines, 
and causes the refrigerant to be pulled out of the receiver-drier and through the expansion 
valves. The expansion valves serve as a controlled spray orifice, to spray the correct amount of 
refrigerant into the evaporator.  
 
  
						

							AIR CONDITIONER SERVICE MANUAL EC145-200M-1 
 
Revision 13  Page 6 
CHAPTER 0 
INTRODUCTION (continued) 
 
14. DESCRIPTION OF THE VAPOR CYCLE AIR CONDITIONER AND ITS INSTALLATION 
(continued) 
 
 This regulation of refrigerant allows the liquid to absorb the heat from the cabin air, and 
transform it to a vapor state just prior to its exiting the evaporator assembly.  
 
The low pressure vapor is then drawn into the compressor where its pressure is raised 
to approximately 200 psi (14.06 kgcm), and its temperature to around 200º F (93.3º C).  
This high pressure / high temperature vapor then travels to the condenser, (a heat 
exchanger cooled by a flow of outside air). Heat is extracted from the refrigerant, and as 
it cools it condenses back into a liquid and flows into the receiver-dryer, ready to repeat 
the cycle. 
 
Refrigeration Cycle Illustration 
 
 
 
 
       Optional Evaporator 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
      High pressure liquid 
      High pressure vapor 
      Low pressure liquid 
      Low pressure vapor 
      Expansion valve        
       By pass line 
 
Receiver-Dryer 
Forward 
Evaporator 
 
Compressor 
Condenser 
Aft Evaporator 
By-pass valve  
						

							AIR CONDITIONER SERVICE MANUAL EC145-200M-1 
 
Revision 13  Page 7 
 
CHAPTER 1 
AIRWORTHINESS LIMITATION SECTION 
 
The Airworthiness Limitations section is FAA approve and specifies maintenance required 
under paragraph 43.16 and 91.403 of the Federal Aviation Regulations unless an alternate 
program has been FAA approved.  
 
1. Airworthiness Limitations 
 
“No airworthiness limitations associated with this type design change” 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
THIS AREA INTENTIONALLY LEFT BLANK 
 
 
 
 
 
 
 
 
 
 
  
						

							AIR CONDITIONER SERVICE MANUAL EC145-200M-1 
 
Revision 13  Page 8 
 
CHAPTER 2 
 INSPECTIONS 
 
1.  INSPECTION REQUIREMENTS 
 
PERIODIC INSPECTIONS  
(Hours are aircraft time) 
Item  Annual Every 300 Hours of Operation Special Inspection Information 
Fwd Evaporator Blower(s)  X  X Check for  Operation in High, and Low settings 
 Condenser   Blower Motor(s) & Fan blade assy. 
 X  X Check for operation     
Aft Evaporator Blower motor  
X  X   Check for operation in High,  and Low settings 
Compressor Drive Belt    X  X Check belt tension, and for signs of excessive wear (example: Glazing, Cracks, and exposed fibers) Air Conditioner Placards & Markings (see chapter 4) 
X   Check for security and legibility 
Air Conditioner Compressor Assembly.  
 X  X Check for operation, security of attaching hardware, and signs of oil or refrigerant leaks.  Air Conditioner Compressor Mount  
 X  X Check mount for cracks, and security of the attaching hardware.  
Plumbing and Fittings  X    Check for security and signs of oil or refrigerant leaks Air Conditioner Compressor drive pulley  
X  X  Check for security of attaching hardware.   
 
 
2.  COMPONENT OVERHAUL / REPLACEMENT SCHEDULE 
(Hours are aircraft time) 
 
Description  Part Number  Overhaul / Replacement Hours Forward   Blower Motor    
ES61064-1 (Fwd.  Evaporator Motor)  The replacement of this item is at the discretion of the operator. It is acceptable to operate the blower until failure. A blower failure will result in a reduction in cooling, but no safety of flight issues are involved. Aft Evaporator Blower Motor & Fan replacement S-6222EC-2 (Aft Evaporator Motor)  The replacement of this item is at the discretion of the operator. It is acceptable to operate the blower until failure. A blower failure will result in a reduction in cooling, but no safety of flight issues are involved. Condenser (Standard) EC145-702 ES73186-4 (Condenser Motor / Blower Assy.)  
The recommended replacement schedule for this item is every five (5) years or 3000 airframe hours, however, it is acceptable to operate on an on condition basis. Condenser (High Output) EC145-704 ES73192-2 (Condenser Motor / Blower Assy.) The recommended replacement schedule for this item is every five (5) years or 3000 airframe hours, however, it is acceptable to operate on an on condition basis. Compressor  EC145-3006-1 (Compressor Assy.)  The recommended replacement schedule for this item is every five (5) years or 3000 airframe hours, however, it is acceptable to operate on an on condition basis. 
 
 
  
						

							AIR CONDITIONER SERVICE MANUAL EC145-200M-1 
 
Revision 13  Page 9 
CHAPTER 3 
LOCATION AND ACCESS 
 
1.  LOCATION OF AIR CONDITIONER FEATURES 
 
Nomenclature  Description of Location Air Conditioner Control Panel  The air conditioner control panel is located in the existing center console panel between the pilot & co-pilot seats.  Forward (Cockpit) Evaporators  The forward evaporators are mounted to the center pedestal forward of the instrument panel in the chin bubble area.  Forward Evaporator Blower Assemblies  The forward evaporator blower assemblies are integral to the Forward Evaporator Assembly. (See Forward “Cockpit Evaporator above) Aft (Main Cabin) Evaporator  Is located on aircraft center line above the main cabin headliner. Condenser Assembly  The condenser assembly is located on the left hand side of the aircraft, just aft of the engine compartment. Compressor  The compressor is mounted to the aft of the main gearbox case. Refrigerant Plumbing  The refrigerant plumbing is routed from the compressor, to the area below the passenger compartment, and forward to the nose area. (As the refrigerant plumbing connects the Compressor, Condenser, and Evaporators, it may at times be necessary to access these components through several panels. Servicing Ports  The Service Ports for this system are located behind the aft left hand interior panel next to the calm shell doors. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
SIDE VIEW 
Fig. 3-1 Layout of Eurocopter EC145 Air Conditioning System 
 
  
						

							AIR CONDITIONER SERVICE MANUAL EC145-200M-1 
 
Revision 13  Page 10 
CHAPTER 3 
LOCATION AND ACCESS (continued) 
 
 
Fig. 3-2 Top View - Model EC145 Fuselage  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER 3  
						

							AIR CONDITIONER SERVICE MANUAL EC145-200M-1 
 
Revision 13  Page 11 
LOCATION AND ACCESS (continued) 
 
2.  Compressor Installation (View Looking Inboard aircraft left) Fig 3-3 
 
 
 
  
						

							AIR CONDITIONER SERVICE MANUAL EC145-200M-1 
 
Revision 13  Page 12 
 
 
 
CHAPTER 3 
LOCATION AND ACCESS (continued) 
 
3.  Forward Evaporator Installation (View looking Inboard Aircraft Left) Fig 3-4 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
						

							AIR CONDITIONER SERVICE MANUAL EC145-200M-1 
 
Revision 13  Page 13 
 
 
CHAPTER 3 
LOCATION AND ACCESS (continued) 
 
4.  Aft Evaporator & Aft Evaporator Blower Assembly Installation (view looking inboard). Fig 3-5 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
						

							AIR CONDITIONER SERVICE MANUAL EC145-200M-1 
 
Revision 13  Page 14 
 
CHAPTER 3 
LOCATION AND ACCESS (continued) 
 
5.  Condenser Assembly Installation (view looking down, Inboard, & Forward). Fig 3-6 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                             Condenser Instl -- Looking Inbd