Air Conditioning System Performance Test

1. Install the manifold gauge set.
2. Run the engine at 2,000 rpm and set the controls tar maximum cooling and high blower speed.
3. Keep all windows and doors open.
4. Place a dry-bulb thermometer in the cool air outlet.
5. Place a psychrometer close to the inlet of the cooling unit.
6. Check that the reading on the high pressure gauge is 1.373 - 1,575 kPa (14 - 16 kg/Sq.cm. 199 - 228 psi)
If the reading is to high, pour water on the condenser.
If the reading is low. cover the front of the condenser.
7. Check that the reading on the dry-bulb thermometer at the air inlet is at 25 - 35 °C (77 - 95 °F)





8. Calculate the relative humidity from the psychrometric graph by comparing the wet-and-dry-bulb reading of the psychrometer at the air inlet.
9. Measure the dry-bulb temperature at the cool air outlet. and calculate the difference between the inlet dry-bulb and outlet dry-bulb temperatures.





10. Check that the intersection of the relative humidity and temperature difference is between the Block hard line. It the intersection is within the block hard line, cooling performance is satisfactory.

PERFORMANCE TEST DIAGNOSIS














The test gauge indicators shown are to be used as typical examples of common problems which you may need to diagnose