HVAC

• Free from scratch, dent or rust.
• Access door gaskets are intact and doors close tightly.
• Connection between duct and AHU is air-tight with the use of tapes or sealant of approved quality.

• Handled with utmost care to avoid denting, damage or soiling.
• Frames are secured to housing and pressure gauge fitted at right place.

• Correct alignment of fan and motor.
• Proper tension in min 2 (preferably all) belts of Vee-belt drive. There should be one set of spare belts supplied by manufacturer.
• Correct rotational direction, frequency and quiet operation of fan.
• After mounting on isolator on a common platform, the block is levelled and shipping removed.

• Coils installed with airflow in same direction as indicated on the casing.
• Headers as per specification – no welding, soldering allowed.
• Coils are clean and fins are in good condition – no denting.

• Gradient and support as per specification for complete drainage of condensate. Gradient checked by spirit level.
• No visible sign of leakage, dripping, seeping or damaged insulation. In case of doubt the pipes should be pressure tested.

• No visible sign of damage to the unit.
• Installation on concrete housekeeping pads & isolator is levelled. A vibration analysis should be conducted.
• Construction debris and shipping material removed.
• Insulation applied over entire surface of the chiller components, 100% of contact surface. Seams and joints are sealed

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• Proper attachment of thermometer, gauge, valves and purge units.
• Functioning of electronic refrigerant leak detection system and automatic exhaust system
• Motor and bearing greased.

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• Temperature and pressure of refrigerant in evaporator and condenser.
• Temperature and flow of water entering and leaving the evaporator and condenser.
• Sufficient refrigerant installed and there is no leakage.
• Pipes are tightly fastened to right port via flexible connection or flanges.

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• Galvanisation on inner surface should be smooth and fault free to prevent dirt accumulation.
• For ceiling plenum, surfaces should be smoothly plastered and painted.
• Insulation should be free of fault.
• Substrate must be cleaned before applying any adhesive.
• Adhesive to be applied evenly on both sides of the fibre insulation and the aluminium foil before sticking together.

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• Pre-fabricated ducts should be installed within seven days after they arrive at site. This prevents any damage to the ducts.
• Anchorage to structural member should be with strong metal hanger or bracket at a distance < 4m from extreme end and with flexible connection.
• Opening position should strictly follow the specification.
• To avoid injury, rivets are used for jointing near access panel and otherwise the screw size is limited to 13mm.

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• Ducts: if required, hydrostatic testing should be done before application of external insulation (SMACNA, 1985).
• VAV box: factory made, calibrated and tested VAV terminals should be again field-tested (PWD, 1997) for air flow accuracy, pressure independence, leakage and damper actuator function.
• Whole system: Checked for tightness, vibration, rattles and proper functioning. Air flow should be balanced in the ducting system.

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• Condition should be dry, disinfected and free from any construction debris.
• All parts and control system as per technical specification.
• Proper mounting to comply with noise level.
• No protective coating should be damaged.

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