SOP on Operation of Air Handling Unit

Rahul Kashyap
3
Purpose
To describe the procedure for operation of AHU.
Pre Requisite:
  • Check the cleanliness of AHU it should be clean.
  • Check Power supply.
  • Ensure that there should not be any leakage in AHU Doors/Frame.
  • Ensure that supply air damper, return air damper, fresh air damper and bleed air
  • damper is in open position on the marked position, Frequency for damper position verification to is weekly and should be verified by QA Personnel record damper position.
  • Ensure that hot water generator is working
  • Check & ensure that silicon tube of Differential pressure switch is mounted across filters to monitor differential pressure should be properly fitted at their places.
  • Starting Procedure:
  • Switch ON the main supply from the main HVAC panel a red indicator will glow up.
  • Switch ON MCB’s mounted inside the AHU control panel RYB indication glow on AHU control panel.
  • Switch ON the AHU blowers by turning selector switch to on position from control Panel.
  • To Switch ON outdoor unit set selector switch to Auto mode.
  • Set the required temperature & RH on Temperature & RH Controller.        
  • Observe for any abnormality in running of AHU, if found rectify it.
  • Check the pressure of Hot water. It should be NLT 1.5 kg/cm2.
  • Differential pressure across the filter shall be as follow:
  • Differential pressure across pre filter shall be NMT 160Pa. In case of increase of DP.
  • Indication will glow on the panel for cleaning of filter, take the filter for cleaning
  • Differential pressure across fine filter shall be NMT 180Pa. In case of increase of DP, Indication will glow on the panel for cleaning of filter, take the filter for cleaning.
  • Frequency of monitoring of Temperature & RH & Differential Pressure is twice in a day
Shut down Procedure:
  • Switch OFF the AHU blower by turning selector switch to off position from control
  • panel Also switch off outdoor unit set selector switch to zero mode.
  • Switch off MCB’s mounted inside the AHU control panel.
  • Switch OFF the main supply of the operating panel of AHU by turning selector switch to off position.


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