Guide To Preventive Maintenance Procedure For Central Air Conditioning Systems For Building Application (part 3)

Maintenance of Chilled and Condenser water Pump

1.Stop the Pump and turn-off load breaker switch.For safety reasons, provide Lock-out Tag-out warning system on load breaker switch.
2.Close isolation valves on the discharge and suction line.
3.Check alignment of motor against the water pump.Alignment shall be conducted if necessary.
4.

Inspect Pump Mechanical / Packing seal for leaks.Replace Mechanical / Packing seal if necessary.
5.This procedure shall be conducted on all Chilled and Condenser water pumps on a monthly basis.

Cleaning of Chilled and Condenser Water In-line Strainers

1.Stop the chilled and condenser water pumps of the in-line strainers to be maintained and close the respective isolation valves at the suction and discharge of the pump.
2.Carefully remove the strainer from the pipe line and wash it with water thoroughly (if possible).If scale have already accumulated in the strainer chemical de-scaler may be used.
3.Re-install the strainer.
4.Waste chemical and contaminated water from this procedure shall be contained and disposed properly.
5.This procedure shall be conducted on all condenser water in-line strainers semi-annually.Like wise, this procedure shall be conducted on all evaporator water in-line strainers annually.

Maintenance of Air Handling Units

Cleaning of Cooling Coil

1.Stop the Air Handling Unit and turn off the load breaker switch.
2.Rinse the cooling coil with an approved chemical coil cleaner (30 liters max.) using pressurized chemical applicator and let the chemical work or penetrate for 15 min.
3.Rinse the cooling coil with clean water sufficient enough to remove all dirt in the coil.
4.Contaminated water from this procedure shall be contained and disposed properly.
5.This procedure shall be implemented on all Air Handling Units semiannually.

Cleaning of 50 microns pre-filters

1.Cleaning of 50 micron pre-filters shall be conducted on all Air Handling weekly.Clean water and neutral detergent shall be used for this procedure.

Inspection of Pillow Blocks / Bearings / Fan Belt Condition and Tension

1.Stop the Air Handling Unit and turn-off load breaker switch.For safety reasons, provide Lock-out Tag-out warning system on load breaker switch.
2.Check the condition of Pillow Blocks and Bearings.Replace / lubricate if necessary.
3.Check alignment of fan pulley against motor pulley.Alignment shall be conducted if necessary.
4.Check Fan Belt condition and tension.Adjustment / Replacement shall be conducted if necessary.
5.This procedure shall be conducted monthly on all Air Handling Units.

Inspection of AHU Casing / Cooling Coil

1.Stop the Air Handling and turn-off load breaker switch.For safety reasons, provide Lock-out Tag-out warning system on load breaker switch.
2.Check Air Handling Unit casing for damage, corrosion, and cleanliness.Clean / Repaint / Repair shall be conducted if necessary.
3.This procedure shall be conducted on semi-annually on all Air Handling units.

Maintenance of Expansion Tank

1.Condition of Expansion Tank Float Valve shall be inspected for damage and float ball adjustment.Replace / Adjustment shall be conducted if necessary.
2.Expansion Tank casing shall be inspected for damage, corrosion and cleanliness.Clean / Repaint / Repair shall be conducted if necessary.
3.This procedure shall be conducted on Expansion Tank on monthly basis.

Hitachi screw type chiller, Trane centrifugal type chiller, King Sun KSN series Cooling tower, Chilled and Condenser Water in-line strainers, Air Handling Units

note: originally posted at Bukisa.com under the same author.

Article Written by joeldgreat

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