AirComm Corporation Cessna 182T T182T Maintenance Manual

Products, Inc. 
CR-182-10 System Service Manual 
 
21-50-00 
Page 202 
April 5, 2002 
 
 
 
 
 
 
 
 
Figure 3 
Correct expansion valve and sense bulb orientation 

Products, Inc. 
CR-182-10 System Service Manual 
 
21-50-00 
Page 301 
April 5, 2002 
AIR-CONDITIONING SYSTEM 
 
SYSTEM SERVICING 
 
1. GENERAL 
 
The air-conditioning system uses refrigerant R134a and the compressor lubricating 
oil used is Polyolester Oil viscosity grade (ISO) 68.  No other refrigerant or 
compressor oil should be used. 
 
Refrigerant R134a is non-explosive, non-flammable, non-corrosive, has practically no 
odor, and is heavier than air.  Although R134a is classified as a safe...

Products, Inc. 
CR-182-10 System Service Manual 
 
21-50-00 
Page 302 
April 5, 2002 
 
B. Tools and Equipment 
 
 
Designation  
Ref. No.  
Qty  
Remarks 
 
R134a Compatible 
Recycling/Recovery Unit  
Comm. Avail.  
1  
None 
 
C. Discharging Procedure 
1)  Connect R134a compatible recycling/recovery unit to the R134a service 
valves located near the evaporator installation on the right hand side of the 
aircraft. 
2)  Empty the recycling/recovery unit of oil. 
3)  Discharge the air-conditioning system...

Products, Inc. 
CR-182-10 System Service Manual 
 
21-50-00 
Page 303 
April 5, 2002 
 
C. Evacuating Procedure 
1) Connect R134a compatible recycling/recovery unit to the R134a service 
valves on the aircrafts air-conditioning system.   
2)  Empty the oil from the recycling/recovery unit. 
3)  Evacuate the air-conditioning system in accordance with the recovery units 
instructions for a minimum of 15 minutes. 
4) Empty the oil from the recycling/recovery unit.  Note the amount of oil 
removed during the...

Products, Inc. 
CR-182-10 System Service Manual 
 
21-50-00 
Page 304 
April 5, 2002 
NOTE:  Adding refrigerant or oil from the recycling/recovery unit directly to the 
low-pressure service tee will allow liquid refrigerant or oil to enter the compressor.  
The compressor is only designed to compressor gas refrigerant, and liquid 
refrigerant or oil may damage/destroy the compressor.  Always close the low side 
of the recycling/recovery unit during charging. 
 
5)  Charge the air-conditioning system in...

Products, Inc. 
CR-182-10 System Service Manual 
 
21-50-00 
Page 601 
April 5, 2002 
AIR-CONDITIONING SYSTEM 
 
INSPECTION/CHECKS 
1. GENERAL 
 
General service procedures are provided to keep the air-conditioning system 
operating at peak efficiency.  Procedures are provided for inspection intervals, 
refrigerant charge inspection, refrigerant leak inspection, and compressor oil level 
inspection. 
 
CAUTION:  Do not operate air-conditioning system with condenser air outlet blocked. 
 
A. Tools and...

Products, Inc. 
CR-182-10 System Service Manual 
 
21-50-00 
Page 602 
April 5, 2002 
 
3.  REFRIGERANT LEVEL INSPECTION 
  To be performed when improper refrigerant charge is suspected. 
 
A. Select air-conditioning system switch to AIR COND position. 
B.  Set the cabin temperature knob to the MAX position. 
C.  Set the fan speed knob to the HI position. 
D.  Run system for five (5) minutes minimum. 
E.  Check that the receiver/drier inlet and outlet fitting temperatures are the same.  
If the outlet is...

Products, Inc. 
CR-182-10 System Service Manual 
 
21-50-00 
Page 603 
April 5, 2002 
7.  Install hose fitting. 
8. Charge air-conditioning system in accordance with the charging 
instructions in this manual.  

Products, Inc. 
CR-182-10 System Service Manual 
 
21-50-01 
Page 1 
April 5, 2002 
ELECTRICAL 
 
DESCRIPTION AND OPERATION 
 
1. GENERAL 
 
The electrical system of the Cessna 182 air-conditioning system operates from the main 
28 VDC buss.  The major components of the electrical system are: 
 
Evaporator Blower:  Blows cold air into the cabin.  
Condenser Blower:  Removes heat from the refrigerant 
Compressor Clutch: Engages/disengages the compressor 
 
2. SAFETY FEATURES 
 
During certain flight...

Products, Inc. 
CR-182-10 System Service Manual 
 
21-50-01 
Page 2 
April 5, 2002 
turning, the air-conditioning is not accomplishing any cooling and the air into the 
evaporator increases in temperature to 72ºF.  The temperature controller measures the 
resistance of the thermistors and determines that the air temperature is too high.  The 
temperature controller de-energizes the normally closed relay to send power back to the 
clutch.  The compressor now turns and lowers the air temperature of the...