AirComm Corporation Air Conditioner R134A Service Manual

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 6 
 
 REFRIGERANT 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 refrigerant, 
certain precautions must be...

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 7 
 
2. DISCHARGING SYSTEM 
 
A. General 
 
The air conditioning system refrigerant must be discharged prior to 
disconnecting or removing components in the refrigerant loop.  Federal law 
prohibits discharging refrigerant into the atmosphere.  Use only an R134a 
compatible recycling/recovery unit when discharging the air conditioning 
system. 
 
 
B. Tools and Equipment 
 
 
Designation  
Ref. No.  
Qty  
Remarks 
 
 
Service Pressure...

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 8 
 
3. EVACUATING SYSTEM 
 
A. General 
 
The air conditioning system must be evacuated prior to charging the system 
with refrigerant.  Evacuating the system removes any moisture that may be in 
the system.  Use only an R134a compatible recycling/recovery unit when 
evacuating the air conditioning system. 
 
 
B. Tools and Equipment 
 
 
Designation  
Ref. No.  
Qty  
Remarks 
 
 
Service Pressure Gauge  
Comm. Avail.  
1  
None 
 
R134a...

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 9 
 
4. CHARGING SYSTEM 
 
A. General 
 
Use only R134a refrigerant when charging air conditioning system.  Federal law 
prohibits discharging refrigerant into the atmosphere.  Use only R134a 
compatible recycling/recovery unit when charging the air conditioning system. 
 
 
B. Tools and Equipment 
 
 
Designation  
Ref. No.  
Qty  
Remarks 
 
 
Service Pressure Gauge  
Comm. Avail.  
1  
None 
 
R134a Compatible 
Recycling/Recovery Unit...

Products, INC. 
TR-134 System Service Manual
 
 
January 8, 2010 
Page 10 
 
5. FLUSHING SYSTEM 
 
A. General 
 
The following procedure is used to whenever the compressor is replaced and 
when system contamination is suspected. 
 
B. Tools and Equipment 
Designation Ref. No. Qty 
Remarks 
Keith Hose Coupler Tool See Procedures  A/R  None 
Service Pressure Gauge  Comm. Avail.  1  None 
R134a Compatible 
Recycling/Recovery Unit Comm. Avail.  1  None 
Polyolester Oil  Comm. Avail.  A/R  Viscosity ISO 68...

Products, INC. 
TR-134 System Service Manual
 
 
January 8, 2010 
Page 11 
 
 
8.  Disconnect all of the expansion valves from the evaporator assemblies.  
Attach the hose coupler tool in place of the expansion valves on all 
evaporator assemblies.  Use caution in handling the expansion valves.  Do 
no support the expansion valve by its remote bulb tubing.  Do not disconnect 
the external equalization port fitting if the expansion valve is an externally 
equalized style (ES26105-1 and ES26106-1). 
 
•...

Products, INC. 
TR-134 System Service Manual
 
 
January 8, 2010 
Page 12 
 
19.  Inspect the expansion valves for damage and debris.  Replace if any 
contamination is found.  Use new o-rings. 
 
20.  Inspect the binary pressure switch for damage and debris.  Flush with dry 
nitrogen or clean dry compressed air before re-installing.  Use new o-rings. 
 
21.  Install a new receiver/drier bottle.  Do not reuse the old bottle under any 
circumstance.  Use new o-rings. 
 
Caution:   Receiver/drier bottles...

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 13 
 
 
 
GENERAL SERVICING
 
 
1. GENERAL 
 
General service procedures are provided to keep the air conditioning system 
operating at peak efficiency.  Procedures are provided for general maintenance 
tips, inspection intervals, maintenance of the plumbing system, to repair hoses, 
and to clean coils.  Procedures are also provided for removal and installation of the 
expansion valve. 
 
CAUTION:  Do not operate air conditioning system...

Products, INC. 
TR-134 System Service Manual
 
 
Aug 21/06 
Page 14 
 
3.  PLUMBING SYSTEM MAINTENANCE PROCEDURES 
 
A. General 
 
The following procedures are used to perform typical maintenance on the air 
conditioning system plumbing.  Procedures are provided for hose or fitting 
replacement.  New Keith Products air conditioning systems use swaged hose 
fittings.  Some systems that have been converted from R12 to R134a 
refrigerant use Barb Lok hose fittings.  Fittings are either o-ring type or use...

Products, INC. 
TR-134 System Service Manual
 
 
January 8, 2010 
Page 15 
 
D.  Hose or Fitting Replacement (Barb-Lok Hose Fittings) 
 
NOTE:  If it is found that a hose or fitting has a leak, it will be necessary to replace 
the entire hose assembly.  Follow the Hose Barb-Lok Instruction below: 
 
1.  Hose should only be cut with a sharp knife.  (Note:  Use of serrated 
blades or saws to cut hose will leave particles that can contaminate 
system.) 
2.  Slide the Barb-Lok socket onto the hose fitting...