STANDARD OPERATING PROCEDURE – AHU UNIT PPM ACTIVITY

  

OBJECTIVE:

To establish a procedure for ladder inspection.

 

POLICY:

Proactively identify, correct, and report ladder defects and damages to promote worker safety in compliance with regulations.

 

RESPONSIBILITY:

 

Shift Engineer

 

PROCEDURE:

 

·        Before activity all PPE’s should available.

·        Apply LOTO equipment to the supply source.

·        Make sure System is isolated from the main supply.

·        Check all the nut & bolts of supply air filter plenum are properly fixed and tight.

·        Check that no gap between supply air filter frame and filter plenum, tighten up the bolts/replace the gasket if required.

·        Check manually all the duct joint of the supply and exhaust duct for air leakages & arrest them by tightening up the nut & bolts/or replace the

·        gasket if required.

·        Check the door lock & door handle for any damage, replace or rectify it if found damaged.

·        Check manually the door gasket for any air leakage if found replace the gasket.

·        Check if the nut & bolts / screw of HVAC & VU cabinet are properly fixed and tight.(If found loose, tighten it up by suitable tools or replace it, if

·        required).

·        Check the air leakage from HVAC & VU cabinet; tighten up the nut/bolts if required.

·        Check the canvas connection of terminal branch / blower suction and discharge; replace it with a new one if found damaged.

·        Check the entire duct joint for Air leakage, arrest it by tightening up of nut bolts or replace the gasket if required.

·        Check the temperature of inlet / outlet of chilled water for its proper working.

·        Check the temperature of inlet / outlet of hot water for its proper working.

·        Check all the nuts and bolts of filters unit and tighten it up, if found loose and replace with new one, if it is found missing.

·        Check the air/dust leakage from filter unit and joint of if found, arrest it by tightening of nuts and bolts or replace the gaskets if required.

·        Check the canvas connection of blower suction/discharge side; if found damaged, replace it with a new one.

 

Electrical

·        Open the panel of the machine & clean it properly.

·        Tighten all the electrical connections, if found loose.

·        Clean the contacts of the contactor.

·        Check that the relay setting of the machine motor is at the rated maximum current of the motor.

·        Check the starter for proper reverse & forward direction of the motor, if not, rectify/replace it.

·        Dress all the cables / conduits in the panel & replace if required.

·        Switch ‘ON’ the main supply and check all sensors for its working.

 

Cooling Coil

·        Switch ‘OFF’ the main supply.

·        Open the doors of cooling coil section of the AHU.

·        Clean the surfaces of and cooling coil with the dry cloth.

·        Wash the inner surfaces of fins with the water.

·        Clean the drain of the AHU and inner surfaces of the AHU with the cloth.

·        Ensure that the water is not stagnant at the drain.

 

 

Motor

·        Ensure that the main power supply of the equipment is disconnected & all utilities are isolated.

·        Ensure that the machine is free of any dust on it.

·        Check for the condition of the bearing & replace if required.

·        Lubricate the bearings with AP-3 or its equivalent grease & assemble it on the shaft.

 

Blower

·        Remove the pulleys from its position.

·        Check the condition of the pulley / Key / Keyways & rectify / replace if required.

·        Check the condition of the belts & replace if required.

·        Check the condition of the bearings & replace if required.

·        Lubricate the bearings with AP-3 or its equivalent grease.

·        Fit the pulleys back to its position.

·        Fit the ‘V’ belts on the pulleys

·        Remove the ‘UNDER PREVENTIVE MAINTENANCE’.

 

Trial

·        Switch ON the main supply to the machine.

·        Check the operation of the machine & set if required.

·        Check the current drawn by the motors; it should not be more than the rated current.

·        At any job motto should be safety first.

·        In case of any major problem, inform the Facility Manager immediately.

 

 

 

REVISION GUIDE:

Any change in the systems will need a change in the SOP.