Air conditioning system - performance test

AIR CONDITIONING SYSTEM - PERFORMANCE TEST

WARNING: R134a is hazardous See Repair, General Precautions.

Carry out this test with bonnet and doors or windows open, air conditioning switched on, temperature control set to cold and blower at maximum speed. Set the air supply control to supply fresh air.

1. Close low pressure valve on refrigerant station.
2. Close high pressure valve on refrigerant station.
3. Connect a Refrigerant Station to the high and low pressure servicing connections.

Performance range

Intake temperature Outlet temperature Low pressure

68 °F 41 - 50°F 20 - 23 lbf/in² 20 °C 5 - 10°C 1.4 - 1.6 bar

75°F 45 - 60°F 21 - 28 lbf/in² 25°C 7 - 15°C 1.5 - 2.0 bar

85°F 46 - 68°F 26 - 40 lbf/in² 30°C 8 - 20°C 1.8 - 2.8 bar

95°F 52 - 72°F 36 - 52 lbf/in² 35°C 11 - 22°C 2.5 - 3.5 bar

4. Insert dry bulb thermometer into cold air outlet and position dry and wet bulb thermometer close to outside air inlet. Do not spill water from the wet thermometer (psychrometer).
5. Start engine and run it at 1500 rev/min for 10 minutes with air conditioning switched on.
6. Read both pressure gauges and thermometers. Check readings against table below with humidity between 60% and 80%.
7. Switch off air conditioning, stop engine, disconnect test equipment.

High pressure

116 - 190 lbf/in² 8.0 - 13 bar

130 - 200 lbf/in² 9.0 - 14 bar

190 - 230 lbf/in² 13 - 16 bar

230 - 270 lbf/in² 16 - 19 bar

Table 1