Wiring harness fix, chassis 2070-on

Sanden Compressor setup and service

Late layout with part numbers

TROUBLESHOOTING GUIDE

The following guide will help the installer determine if a problem exists in the system that would cause a malfunction. If you are experiencing problems in the physical operation of the unit ( blower speeds, door operation, etc.), we encourage you to refer to the wiring diagram located in the instruction manual. Using a continuity or light tester you can solve many of the simple problems by tracing all connections and testing them individually. However, if the unit is functioning correctly, but it is not cooling, you can refer to the following guide that will outline the most common problems encountered by installers.

I. TEST CONDITIONS USED TO DETERMINE SYSTEM OPERATION

1. Place temperature probe (thermometer) into the center outlet.
2. Connect gauges or service equipment to high/low charging ports.
3. Place blower fan switch on medium.
4. Close all doors and windows on vehicle.
5. Place shop fan or heavy-duty squirrel-cage blower directly in front of condensor.
6. Run engine idle up to 1500 rpm.

 ( These test conditions will simulate the effect the affect fo driving the vehicle and give the technician the three critical readings that they will need to diagnose any potential problems)

 II. ACCEPTABLE OPERATING PRESSURE RANGES FOR VINTAGE AIR    SYSTEMS

     A. R134A TYPE

1. High-side pressures ( 160-250 PSI ) * Note- general rule of thumb is two times the ambient ( daytime ) temperature,  plus 15-20%.
2. Low-side pressures ( 06-12 PSI in a steady state)
3. Center duct temperature ( 36-46 DEGREES F.) 

      B. R12 TYPE

1. High-side pressures ( 140-230 PSI ) * Note- general rule of thumb is two times the ambient ( daytime ) temperature,  plus 15%.
2. Low-side pressures ( 12-15 PSI in a steady state)
3. Center duct temperature ( 36-46 DEGREES F.)