AirComm Corporation Bell Air Conditioner 206L4 Installation Instructions with TORQLOK Plumbing

INSTRUCTIONS FOR CONTINUED AIRWORTHINESS - 206EC-270M-1 
 
Revision H  Page 5 
 
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.  
This regulation of refrigerant allows the liquid to absorb the heat from the cabin air, and 
transform it to a...

INSTRUCTIONS FOR CONTINUED AIRWORTHINESS - 206EC-270M-1 
 
Revision H  Page 6 
 
 
 
15. Refrigeration Cycle Schematic 
(PLEASE NOTE: This illustration is provided as a reference only and may not match actual 
installation)    
  
 
Figure 1:  Refrigeration Cycle Illustration 
 
 
 
High pressure liquid  
 
 Low pressure vapor 
Low pressure liquid  
High pressure vapor  
Compressor  
Condenser 
Evaporator  
Receiver 
Drier Bottle  
Bypass 
Valve  
Expansion 
Valves  
Evaporator   

INSTRUCTIONS FOR CONTINUED AIRWORTHINESS - 206EC-270M-1 
 
Revision H   Page 7 
 
CHAPTER 2 
AIRWORTHINESS LIMITATION SECTION 
 
The Airworthiness Limitations section is FAA approved 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 design change 
 
  

INSTRUCTIONS FOR CONTINUED AIRWORTHINESS - 206EC-270M-1 
 
Revision H   Page 8 
 
CHAPTER 3 
INSPECTIONS  
1. INSPECTION REQUIREMENTS:  
 
Periodic Inspections  
(Hours Are Aircraft time) 
 
Item Annual 
Every 200 
hours of 
operation 
Special inspection instructions. 
Fwd Evaporator  
Blower  
X  
 
Check for operation throughout 
entire speed range of blower 
operation.  
Aft Evaporator  
Blower  
X  Check for operation throughout 
entire range of speed for blower 
operation. 
Condenser blower 
motor...

INSTRUCTIONS FOR CONTINUED AIRWORTHINESS - 206EC-270M-1 
 
Revision H   Page 9 
 
2. INSPECTION PROCEDURES.  
NOTE 
Refer to “Chapter 4 Location and Access” to locate all components for inspection. 
 
 
A. Inspection of the FWD and AFT evaporator blower motors 
 
CAUTION 
Fans are designed to operate with the resistance of the entire ducting system. Operation of the 
evaporator fans with any part of the distribution system removed may cause permanent damage 
to the fan motor. 
 
WARNING 
Fans may take up...

INSTRUCTIONS FOR CONTINUED AIRWORTHINESS - 206EC-270M-1 
 
Revision H   Page 10 
c. Connect 28V ground power to the aircraft and place the A/C mode switch 
in the “A/C” position and verify that: 
1. Condenser scoop opens. 
2. Condenser fan is activated and operating. This fan should pull air into 
the aircraft through the open scoop and exit at the screen below the 
condenser. 
3. Compressor clutch is engaged. Verify compressor clutch engagement 
by visually observing the clutch plate clamp to the...

INSTRUCTIONS FOR CONTINUED AIRWORTHINESS - 206EC-270M-1 
 
Revision H   Page 11 
 
 
Figure 2:  Belt Tension Inspection 
 
D. Inspection of air conditioner placards and markings. 
a. Check all air conditioner placards and markings for security and legibility. 
 
E. Inspection of air conditioner compressor assembly 
NOTE: 
The air conditioning system must be serviced with refrigerant to perform this inspection. 
 
a. Connect 28V ground power to the aircraft and place the A/C mode switch 
in the “A/C”...

INSTRUCTIONS FOR CONTINUED AIRWORTHINESS - 206EC-270M-1 
 
Revision H   Page 12 
H. Inspection of Compressor Drive system 
a. Cut the safety wire on the belt tensioning link assembly jam nuts and adjust 
the tensioning link assembly to loosen the compressor drive belt.  
b. Check S-3520 drive pulley for play relative to the tail rotor drive shaft, both 
in the direction of rotation as well as for lateral movement relative to the 
shaft, and inspect area around the base of the drive ring at the shaft for...

INSTRUCTIONS FOR CONTINUED AIRWORTHINESS - 206EC-270M-1 
 
Revision H   Page 13 
 
CHAPTER 4  
 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 overhead circuit breaker panel 
between the pilots and co-pilots seats.  
Forward (Flight Deck) Evaporators The forward evaporator(s) are mounted to the 
center pedestal below the instrument panel in 
the chin...

INSTRUCTIONS FOR CONTINUED AIRWORTHINESS - 206EC-270M-1 
 
Revision H   Page 14 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Figure 
3:  Layout
 of Air Conditioning
 
Single Fwd Evaporator
 Electrical Instl
Aft Evaporator Instl
Condenser Instl
Fwd Evaporator Instl
Air Distribution System
Compressor Instl
Condenser Instl
Air Outlets