Operational procedure of Air Conditioning System

  • The air handling unit contains the evaporator coil which extracts the heat from the air inside.
  • The compressor draws low pressure refrigerant vapour and delivers the high pressure refrigerant vapour through an oil separator to the condenser.
  • The condenser liquefies the refrigerant.
  • The liquid refrigerant from the condenser passes through the master solenoid, filter dryer and thermostatic expansion valve to the air handling unit.

Before starting the air conditioning plant, carry out few checks.

  • Check the oil level in the crank case of the compressor.
  • Insufficient oil wears down the components.
  • In extreme cases, it may lead to seizure of the compressor.
  • Check whether the cooling water inlet and outlet valves to the condenser are open.
  • Insufficient flow of cooling water results in improper condensation which in turn increases the compressor discharge side pressure.
  • Open the compressor outlet valve, condenser inlet valve, receiver outlet valve, filter drier inlet valve and outlet valves.
  • Check whether power supply is available to the compressor motor.
  • Check whether the blower is running.
  • Ensure the compressor is in manual mode.
During start of air conditioning system:

  • Open the compressor inlet valve by half a turn and start the compressor.
  • Open the compressor inlet valve slowly to fully open position.
  • Change the operation of the compressor to automatic mode.
  • Check the amperage of the compressor and blower motors.
  • Check the temperature setting and adjust if required.
During operation :
  • Check the compressor suction, discharge and oil pressure.
  • Inspect the compressor unit and check for any abnormality and vibration.
  • Check the compressor oil level and check whether the oil returns from the oil separator to the crankcase by filling the oil return pipeline.
  • Check the inlet and outlet air temperature of the air handling unit.
During auto Stopping :
  • As the temperature reaches the set value, the thermostatic switch will cut off the compressor.
  • The blower will continue to run.
  • When the air temperature increases, the compressor will cut in.
To shutdown for longer duration:
  • To shutdown for prolonged period, close the condenser liquid receiver outlet valve.
  • The liquid refrigerant is collected inside the condenser receiver and the compressor stops due to low pressure.
  • Shut the refrigerant line valves.
  • Shut the condenser cooling water inlet and outlet valves.
  • Switch off the power supply.

Refrigerent R-404 A
Cooling method direct expansion system
Heating method steam coil
Humidification steam spray
Compressor four cylinder, reciprocating
Condenser horizontal shell & tube type
Main power source 440 v AC, 60 hz, 3 phase
Control circuit power source 220 v AC, 60 HZ, 3PHASE


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