AirComm Corporation Air Conditioner R134A Service Manual

							Products, Inc 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 26 
 
CHECKS 
 
1. GENERAL 
 
The following procedures are used to perform typical maintenance checks for air 
conditioning system refrigerant leaks, refrigerant charge and compressor oil level. 
 
CAUTION:  Do not operate air conditioning system with condenser air outlet blocked. 
 
A. Tools and Equipment 
 
 
Designation  
Ref. No.  
Qty  
Remarks 
 
 
Service Pressure Gage  
Comm. Avail.  
1  
None 
 
Oil Dipstick  
Make from metal 
wire.  
1  
See Fig. 3. 
 
Electronic Leak Detector  
Comm. Avail.  
A/R  
Type H-10G 
 
Polyolester Oil  
Comm. Avail.  
A/R  
Viscosity ISO 68 
 
2.  REFRIGERANT LEVEL CHECK 
 
A.  Select air conditioning system to ON. 
B.  Set the temperature selector (if so equipped) to the full cold position. 
C.  Set the blower speed to the maximum position. 
D.  Run system for five (5) minutes minimum. 
E.  Check sight glass for presence of bubbles. Add refrigerant until bubbles 
disappear.   
NOTE: The refrigerant bubbles are more difficult to see at ambient temperatures 
below 65°F.  Always re-check refrigerant level when ambient temperature 
is above 65°F for proper level.  
						

							Products, Inc 
TR-134 System Service Manual
 
 
January 8, 2010 
Page 27 
 
3.  REFRIGERANT SYSTEM LEAKAGE CHECK 
 
A.  The system leakage check is to be performed in an area with an ambient 
temperature of 65°F or above. 
B.  Install service pressure gage to low and high pressure R-134a service valves. 
C.  Check for system pressure of approximately 64 psig or above.  The low pressure 
gage may be used to check system pressure.  If system pressure is below 64 
psig, a small amount of refrigerant R-134a may be added to obtain the required 
pressure. 
D.  On systems that have not been operated for 2 weeks or longer, operate the 
system for a minimum of 15 minutes.  This will lubricate the compressor shaft 
seal and ensure a more accurate leakage check of the shaft seal. 
E.  With the system off, and using a type H-10G electronic leak detector or 
equivalent, check all connections, compressor shaft seal, and fabricated 
components for leakage.  No leakage is acceptable. 
 
4.  COMPRESSOR OIL LEVEL CHECK 
 
NOTE: It is not necessary to check the compressor oil level during routine 
maintenance.  It only needs to be checked when a system component is 
replaced or when incorrect oil level is suspected.  Only polyolester oil 
viscosity grade ISO 68 should be used. 
 
1.  Operate air conditioning system for 10 minutes.  This will collect as much oil 
as possible in the compressor. 
 
2. Perform flushing procedure.  
						

							Products, Inc 
TR-134 System Service Manual
 
 
January 8, 2010 
Page 28 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RESERVED