AirComm Corporation Air Conditioner R134A Service Manual

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 16 
 
4.  COIL CLEANING MAINTENANCE PROCEDURES 
 
A. General 
 
The following procedure is used for cleaning either evaporator or condenser 
coil. 
 B. Tools and Equipment 
 
 
Designation  
Ref. No.  
Qty  
Remarks 
 
 
Vacuum Cleaner  
Comm. Avail.  
1  
None 
 
Coil Cleaner  
Comm. Avail.  
A/R  
Non-acid based 
 
C.  Coil Cleaning Procedure 
1.  Use vacuum cleaner to remove large debris from upstream and 
downstream coil faces. 
2....

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 17 
 
5.  EXPANSION VALVE REMOVAL AND INSTALLATION 
 
A. General 
 
The following procedure is used to remove or install the air conditioning system 
expansion valve. 
 
B. Tools and Equipment 
 
Designation 
  
Ref. No.  
Qty  
Remarks 
 
Sealant  
ES49000-1  
A/R  
None 
 
Polyolester Oil  
Comm. Avail.  
A/R  
Viscosity ISO 68 
 
C. Expansion Valve Replacement 
1.  Discharge system in accordance with Refrigerant Servicing section. 
2....

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 18 
 
(Figure A) 
 
(Figure B) 
 
 
(Figure C) 
 
  

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 19 
 
6.  COMPRESSOR MAINTENANCE PROCEDURES 
 
A. General 
 
The following procedure is used whenever the compressor is replaced or 
contamination is suspected. 
 
B. Tools and Equipment 
Designation Ref. No. Qty 
Remarks 
None - - None 
 
C. Compressor Replacement 
 
1.  Flush system and replace compressor per the Refrigerant Servicing 
section. 
 
 
  

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 20 
 
TROUBLESHOOTING 
 
1. GENERAL 
 
The procedures below present troubleshooting charts for the air conditioning 
system and the compressor.  A diagnoses chart is presented for insufficient air 
conditioning system cooling.  The performance characteristics of an aircrafts 
particular system is dependant upon the design parameters of the systems 
components.  The performance of any one particular system varies with ambient 
temperature...

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 21 
 
Figure 3.  Air Conditioning System Diagnosis Chart  

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 22 
 
3.  AIR CONDITIONING SYSTEM TROUBLESHOOTING 
 
 CONDITION  
SERVICE 
PRESSURE 
GAUGE READING  
 PROBABLE CAUSE 
CORRECTIVE 
ACTION 
 
INSUFFICIENT 
REFRIGERANT 
CHARGE 
 
Insufficient cooling.  
Bubbles appear in 
sight glass.  
  
SUCTION  
PRESSURE:  below 
normal 
 
DISCHARGE 
PRESSURE:  below 
normal  
 
Refrigerant is low, or leaking 
a little.  
 
1.  Leak test. 
2.  Repair leak. 
3.  Charge system. 
 
Evacuate as necessary 
and...

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 23 
 
 
 
 CONDITION  
SERVICE 
PRESSURE 
GAUGE READING  
 PROBABLE CAUSE 
CORRECTIVE 
ACTION 
 
AIR IN SYSTEM 
 
Insufficient cooling.  
 
Sight glass shows 
occasional bubbles.    
SUCTION  
PRESSURE:  above 
normal 
 
DISCHARGE 
PRESSURE:  above 
normal  
 
 
Air mixed with refrigerant in 
system.  
 
 
1. Discharge system. 
2  Replace receiver drier. 
3.  Evacuate and charge 
 system. 
 
 
MOISTURE IN SYSTEM 
 
After operation for a...

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 24 
 
 
 
 CONDITION  
SERVICE 
PRESSURE 
GAUGE READING  
 PROBABLE CAUSE 
CORRECTIVE 
ACTION 
 
FAULTY 
COMPRESSOR 
 
Insufficient cooling.  
 
 
SUCTION  
PRESSURE:  much 
above normal 
 
 
DISCHARGE 
PRESSURE: much  
below normal  
 
 
Internal problem in 
compressor, or damaged 
gasket and valve.  
 
 
1. Discharge system. 
2. Remove and check 
compressor. 
3.  Repair or replace 
compressor. 
4.  Check oil level. 
5.  Replace receiver...

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 25 
 
4.   COMPRESSOR TROUBLESHOOTING 
  
A. General 
 
The following procedures are used for troubleshooting the compressor. 
 
B. Tools and Equipment 
 
 
Designation  
Ref. No.  
Qty  
Remarks 
 
 
Service Pressure Gauge  
Comm. Avail.  
1  
None 
 
DC Power Supply  
  
A/R  
None 
 
C. Compressor Troubleshooting Procedures 
 
With the air conditioning system operating, do any of the following conditions occur: 
 
NOTE:  Always attach a...